阅读说明：本技术 接合结构 (Joint structure ) 是由 藤原润司 中川龙幸 于 2020-04-08 设计创作，主要内容包括：第二构件(20)由相对于第一构件(10)焊接困难的材料构成。在第一构件(10)形成有在厚度方向上贯通的第一贯通部(11)。第三构件(30)经由第二构件(20)的第二贯通部(21)而被电弧焊接于第一贯通部(11)的内周面以及第一构件(10)的开口面(10a)。通过第三构件(30)的凝固收缩从而第二构件(20)被凸缘部(31)与第一构件(10)压缩,由此第二构件(20)固定于第三构件(30)的凸缘部(31)与第一构件(10)之间。(The second member (20) is made of a material that is difficult to weld to the first member (10). A first through-hole (11) is formed in the first member (10) so as to penetrate in the thickness direction. The third member (30) is arc-welded to the inner peripheral surface of the first through-hole (11) and the opening surface (10a) of the first member (10) via the second through-hole (21) of the second member (20). The second member (20) is compressed by the flange section (31) and the first member (10) due to solidification shrinkage of the third member (30), and the second member (20) is fixed between the flange section (31) of the third member (30) and the first member (10).)

1. A joint structure formed by joining a first member made of a metal material, a second member made of a material difficult to weld to the first member, and a third member made of a solder welded to the first member to each other,

the first member has a first through-hole penetrating in a thickness direction,

the second member has a second through-hole opened at a position corresponding to the first through-hole,

the third member has a flange portion that presses a peripheral edge portion of the second through-hole, and is arc-welded to an inner peripheral surface of the first through-hole of the first member and an opening surface of the first member that is opened by the second through-hole of the second member via the second through-hole,

the second member is compressed by the flange portion and the first member by solidification contraction of the third member, whereby the second member is fixed between the flange portion and the first member.

2. The joining structure of claim 1,

the flange portion extends radially outward beyond the second through-hole on a surface of the second member opposite to the first member.

3. The joining structure of claim 1,

the second through-portion is defined by the peripheral edge portion having a tapered portion tapered toward the first member,

the flange portion presses the tapered portion.

4. The joining structure according to any one of claims 1 to 3,

the first through-hole has a tapered shape, and the first through-hole has an end closer to the second member in the thickness direction and an end farther from the second member, the farther end having a smaller size than the closer end.

5. The joining structure according to any one of claims 1 to 3,

the first through-hole has a tapered shape, and the first through-hole has an end closer to the second member in the thickness direction and an end farther from the second member, the farther end having a larger dimension than the closer end.

6. The joining structure according to any one of claims 1 to 5,

the first through hole includes a plurality of first small through holes smaller than the first through hole.

7. The joining structure according to any one of claims 1 to 6,

the third member has a locking portion that is locked to a peripheral edge portion of the first through-hole on a surface of the first member on a side opposite to the second member.

8. The joining structure according to any one of claims 1 to 7,

the joining structure includes a fixing member that is overlapped with a surface of the second member on a side opposite to the first member,

the fixing member has a fixing hole opened at a position corresponding to the second through-hole and the first through-hole,

the third member is arc-welded to the inner peripheral surface of the first through hole and the opening surface of the first member opened by the second through hole of the second member via the fixing hole and the second through hole,

the flange portion presses a peripheral edge portion of the second through-hole portion via the fixing member,

the fixing member and the second member are compressed by the flange portion and the first member by solidification contraction of the third member, whereby the fixing member and the second member are fixed between the flange portion and the first member.

9. The joining structure according to any one of claims 1 to 8,

the second member further has a stepped portion that opens on a surface on a side opposite to the first member, and the second through-hole is formed in a bottom surface of the stepped portion.

10. The joining structure of claim 9,

the bottom surface of the step portion is inclined toward the second through portion.

11. The joining structure according to any one of claims 1 to 10,

the third member has a first joint portion welded to the first member and a second joint portion welded to the first joint portion to constitute the flange portion.

12. The joining structure according to any one of claims 1 to 11,

the first through hole has a smaller size than the second through hole, and the opening surface is a region of the upper surface of the first member that is located inside the second through hole.

13. A joint structure, wherein,

the joining structure includes:

a first member having: an upper surface; a lower surface opposite the upper surface; and a first through-hole extending from the upper surface to the lower surface, the first member being made of a metal material;

a second member having: a second through-hole which is opened at a position corresponding to the first through-hole and is larger than the first through-hole; and a peripheral edge portion that defines the second through-hole, the second member being made of a material that is difficult to weld to the first member and being disposed on the upper surface of the first member; and

a third member having: a welding portion arc-welded to an inner peripheral surface of the first through-hole and a periphery of the first through-hole in the upper surface of the first member; and a flange portion connected to the soldering portion via the second through-hole portion and covering the peripheral edge portion, wherein the third member is made of solder soldered to the first member,

the second member is compressed by the flange portion and the first member by solidification contraction of the third member, thereby being fixed between the flange portion and the first member.

14. A method of bonding, wherein,

preparing a first member made of a metal material having an upper surface and a lower surface opposite to the upper surface and having a first through portion extending from the upper surface to the lower surface,

preparing a second member having a second through hole and a peripheral edge portion defining the second through hole and made of a material difficult to weld to the first member,

the second member is disposed on the upper surface of the first member such that the second through-hole is located at a position corresponding to the first through-hole and an opening surface of the first member that is opened by the second through-hole of the second member is formed,

forming a third member composed of a solder welded to the first member and having a flange portion pressing the peripheral edge portion by arc welding an inner peripheral surface of the first through-hole of the first member and an opening surface of the first member through the second through-hole,

the second member is compressed by the flange portion and the first member by solidification shrinkage of the third member, whereby the second member is fixed between the flange portion and the first member.

Technical Field

The present invention relates to a joining structure.

Background

Patent document 1 discloses a joint structure in which a first metal material and a dissimilar metal material that is difficult to weld to the first metal material are superposed on each other and a solder (welding wire) is arc-welded through a through-hole of the dissimilar metal material.

At this time, a brim portion is formed by the melted solder so as to cover the outer peripheral portion of the upper surface side of the penetration portion of the different material. Thereby, the dissimilar material and the first metal material are fixed by the compressive fixing force between the eaves portion and the first metal material, which is generated by solidification and contraction of the solder with respect to the first metal material.

Documents of the prior art

Patent document

Patent document 1: international publication No. 2018/030272

Disclosure of Invention

Problems to be solved by the invention

However, in the invention of patent document 1, for example, when the hole diameter of the through portion is small, the welding area of the solder in the first metal material is also small, and the bonding strength may be insufficient.

The present invention has been made in view of the above problems, and an object of the present invention is to increase a welding area of solder and ensure bonding strength.

Means for solving the problems

The present invention is directed to a joining structure in which a first member made of a metal material, a second member made of a material difficult to be welded to the first member, and a third member made of a solder welded to the first member are joined to each other, and the following solution is adopted.

That is, in the first aspect of the invention, the first member has a first through-hole penetrating in the thickness direction. The second member has a second through-hole that opens at a position corresponding to the first through-hole. The third member has a flange portion that presses a peripheral edge portion of the second through hole. The third member is arc-welded to the inner peripheral surface of the first through-hole of the first member and the opening surface of the first member opened by the second through-hole of the second member via the second through-hole. The second member is compressed by the flange portion and the first member by solidification contraction of the third member, whereby the second member is fixed between the flange portion and the first member.

In the first invention, the second member is made of a material that is difficult to weld with respect to the first member. The first member is formed with a first through-hole penetrating in the thickness direction. The third member is arc-welded to the inner peripheral surface of the first through-hole and the opening surface of the first member opened by the second through-hole of the second member through the second through-hole of the second member. The second member is compressed by the flange portion and the first member by solidification contraction of the third member, whereby the second member is fixed between the flange portion of the third member and the first member.

In this way, by providing the first through-hole in the first member and arc-welding the third member to the inner peripheral surface of the first through-hole and the opening surface of the first member opened by the second through-hole of the second member, the welding area of the third member can be increased. This ensures the bonding strength between the first member, the second member, and the third member.

In a second aspect of the present invention, in the first aspect of the present invention, the flange portion extends radially outward beyond the second through-hole portion on a surface of the second member on a side opposite to the first member.

In the second aspect of the invention, the second member can be fixed between the flange portion and the first member by pressing the surface of the second member on the side opposite to the first member with the flange portion.

In a third aspect of the invention, in the first aspect of the invention, the second through hole is defined by the peripheral edge. The peripheral edge portion has a tapered portion that tapers toward the first member. The flange portion presses the tapered portion.

In the third aspect of the invention, the tapered portion is provided at the peripheral edge portion, so that the molten solder can easily flow toward the first through portion. Further, by forming the flange portion in a shape along the tapered portion, the thickness of the flange portion protruding from the second member can be suppressed.

In a fourth aspect of the invention, in any one of the first to third aspects of the invention, the first through hole has a tapered shape. The first through-hole has an end closer to the second member and an end farther from the second member in the thickness direction. The distal end has a smaller dimension than the proximal end.

In the fourth aspect of the invention, the first through-hole is formed in a tapered shape, so that the molten solder can easily flow from the near end to the far end in the first through-hole.

In a fifth aspect of the invention, in any one of the first to third aspects, the first through hole has a tapered shape. The first through-hole has an end closer to the second member and an end farther from the second member in the thickness direction. The distal end has a larger dimension than the proximal end.

In the fifth aspect of the invention, the first through portion is formed in a tapered shape having a widened width. Thus, when the melted solder solidifies at the widened portion of the first through portion, the third member is fitted into the first through portion, and the bonding strength can be improved.

In a sixth aspect of the invention, in any one of the first to fifth aspects, the first through hole includes a plurality of first small through holes smaller than the first through hole.

In the sixth aspect of the invention, the plurality of first small through-holes are provided, whereby the molten solder can be soldered while being dispersed to the plurality of first small through-holes. Further, the third member is fitted into the plurality of first small through-holes, so that a wedge effect can be obtained in the plurality of first small through-holes, and the joining stability can be improved.

In a seventh aspect of the present invention, in any one of the first to sixth aspects, the first member has a peripheral edge portion that defines the first through portion. The third member has a locking portion that is locked to the peripheral edge portion of the first member on a surface of the first member on a side opposite to the second member.

In the seventh aspect of the invention, the engagement portion can prevent the third member from coming off the first through-hole. Further, since the first member and the second member are fixed between the flange portion and the locking portion, the joining strength can be improved.

In an eighth aspect of the invention, in any one of the first to seventh aspects of the invention, the joining structure includes a fixing member that is overlapped with a surface of the second member on a side opposite to the first member. The fixing member has a fixing hole that opens at a position corresponding to the second through-hole and the first through-hole. The third member is arc-welded to the inner peripheral surface of the first through hole and the opening surface of the first member opened by the second through hole of the second member via the fixing hole and the second through hole. The flange portion presses the peripheral edge portion of the second member via the fixing member. The fixing member and the second member are compressed by the flange portion and the first member by solidification contraction of the third member, whereby the fixing member and the second member are fixed between the flange portion and the first member.

In the eighth aspect of the present invention, the second member is stacked with the fixing member. The third member is arc-welded to the inner peripheral surface of the first through-hole and the opening surface of the first member, which is opened by the second through-hole of the second member, via the fixing hole of the fixing member and the second through-hole of the second member. The solidification shrinkage of the third member causes the fixing member and the second member to be compressed between the flange portion of the third member and the first member, thereby fixing the fixing member and the second member.

Thus, when the third member is arc-welded to the inner peripheral surface of the first through-hole of the first member and the opening surface of the first member opened by the second through-hole of the second member, the flange portion can be formed by the fixing member while suppressing the amount of heat input to the second member. Further, a second member, which is a different material, can be sandwiched and fixed between the first member and the fixing member.

In a ninth aspect of the invention, in any one of the first to eighth aspects, the second member further includes a stepped portion having an opening on a surface on a side opposite to the first member, and the second through hole is formed in a bottom surface of the stepped portion.

In the ninth aspect of the present invention, the second through hole is formed in the bottom surface of the stepped portion of the second member. Thus, the flange portion of the third member is disposed in the stepped portion, and the flange portion can be prevented from bulging out of the second member.

In a tenth aspect of the present invention, in the ninth aspect, a bottom surface of the stepped portion is inclined toward the second through hole.

In the tenth aspect of the invention, the bottom surface of the stepped portion is inclined toward the second through hole, so that the molten solder can easily flow toward the second through hole.

In an eleventh aspect of the invention, in any one of the first to tenth aspects, the third member has a first joint portion welded to the first member and a second joint portion welded to the first joint portion to constitute the flange portion.

In the eleventh aspect of the invention, the third member is formed separately from the first joint portion and the second joint portion, whereby the welding method or the welding conditions can be used separately in consideration of the material characteristics of the second member.

For example, when the melted solder is soldered to the first member through the second through-hole, short-circuit soldering with less arc spread may be performed by heat input necessary for penetration, and the first joint portion may be formed. Thereafter, pulse welding with positive polarity or alternating current, in which the arc is greatly expanded, may be performed with a low heat input to such an extent that the second member is not melted, and the second joint portion may be formed. This enables the flange portion to be formed while suppressing the amount of heat input to the second member.

In a twelfth aspect of the invention, in any one of the first to eleventh aspects, the first through hole has a smaller size than the second through hole. The opening surface is a region of the upper surface of the first member located in the second through hole.

In this way, the diameter of the first through hole is smaller than the diameter of the second through hole of the second member (the diameter of the opening surface of the first member opened by the second through hole of the second member). This enables welding while suppressing heat input to the first member and the second member. The third member has a convex shape formed by the inner peripheral surface and the opening surface of the first through portion. The convex shape enlarges the surface area to be bonded. The convex shape exerts an anchoring effect like a wedge, and further improves the bonding strength and reliability.

The thirteenth invention relates to a joint structure including a first member, a second member, and a third member. The first member has an upper surface and a lower surface opposite the upper surface. The first member has a first through-hole extending from the upper surface to the lower surface. The first member is composed of a metal material. The second member has a second through-hole portion that is open at a position corresponding to the first through-hole portion and is larger than the first through-hole portion, and a peripheral edge portion that defines the second through-hole portion. The second member is composed of a material that is difficult to weld with respect to the first member. The second member is disposed on the upper surface of the first member. The third member has a welded portion and a flange portion connected to the welded portion via a second through portion. The welding portion is arc-welded to the inner peripheral surface of the first through portion and the periphery of the first through portion in the upper surface of the first member. The flange portion covers the peripheral edge portion. The third member is composed of solder soldered to the first member. The second member is compressed by the flange portion and the first member by solidification shrinkage of the third member, thereby being fixed between the flange portion and the first member.

In this way, by providing the first through-hole in the first member and arc-welding the third member to the inner peripheral surface of the first through-hole and the opening surface of the first member opened by the second through-hole of the second member, the welding area of the third member can be increased. This ensures the bonding strength between the first member, the second member, and the third member.

The fourteenth invention relates to a joining method including preparation of the first member, preparation of the second member, and formation of the third member. The first member has an upper surface and a lower surface opposite the upper surface. The first member has a first through-hole extending from the upper surface to the lower surface. The first member is composed of a metal material. The second member has a second through-hole and a peripheral edge portion defining the second through-hole. The second member is composed of a material that is difficult to weld with respect to the first member. The second member is disposed on the upper surface of the first member such that the second through-hole is located at a position corresponding to the first through-hole and an opening surface of the first member, which is opened by the second through-hole of the second member, is formed. The third member is formed by arc welding to the inner peripheral surface of the first through-hole of the first member and the opening surface of the first member through the second through-hole. The third member is composed of solder soldered to the first member. The third member has a flange portion that presses the peripheral edge portion. The second member is compressed by the flange portion and the first member by solidification contraction of the third member, whereby the second member is fixed between the flange portion and the first member.

In the fourteenth invention, the second member is composed of a material that is difficult to weld with respect to the first member. The first member is formed with a first through-hole penetrating in the thickness direction. The third member is arc-welded to the inner peripheral surface of the first through-hole and the opening surface of the first member opened by the second through-hole of the second member through the second through-hole of the second member. The second member is compressed by the flange portion and the first member by solidification contraction of the third member, whereby the second member is fixed between the flange portion of the third member and the first member.

In this way, by providing the first through-hole in the first member and arc-welding the third member to the inner peripheral surface of the first through-hole and the opening surface of the first member opened by the second through-hole of the second member, the welding area of the third member can be increased. This ensures the bonding strength between the first member, the second member, and the third member.

Effects of the invention

According to the present invention, the welding area of the solder can be increased to ensure the bonding strength.

Drawings

Fig. 1 is a side sectional view for explaining the joining structure of embodiment 1.

Fig. 2 is a side sectional view for explaining the joining structure of embodiment 2.

Fig. 3 is a side sectional view for explaining the joining structure of embodiment 3.

Fig. 4 is a side sectional view for explaining the joining structure of embodiment 4.

Fig. 5 is a side sectional view for explaining the joining structure of embodiment 5.

Fig. 6 is a side sectional view for explaining the joining structure of embodiment 6.

Fig. 7 is a side sectional view for explaining the joining structure of embodiment 7.

Fig. 8 is a side sectional view for explaining the joining structure of embodiment 8.

Fig. 9 is a side sectional view for explaining the joining structure of embodiment 9.

Fig. 10 is a side sectional view for explaining the joining structure of embodiment 10.

Fig. 11 is a side sectional view for explaining the joining structure of embodiment 11.

Fig. 12 is a side sectional view for explaining the joining structure of embodiment 12.

Fig. 13 is a side sectional view for explaining the joining structure of embodiment 13.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the present invention, its application, or uses.

EXAMPLE 1

Fig. 1 shows a joining structure for joining a first member 10 made of a metal material, a second member 20 made of a material difficult to solder with respect to the first member 10, and a third member 30 made of solder to each other.

The first member 10 is a plate-shaped member made of a metal material. The first member 10 has a first through-hole 11 penetrating in the thickness direction. In the example shown in fig. 1, the first through hole 11 is formed by a circular through hole. The first through-hole 11 is formed as a through-hole by laser processing such as milling, turning, drilling, or the like. The first member 10 has an upper surface 10b and a lower surface 10c opposite the upper surface 10 b. The upper surface 10b faces the second member 20. The first through portion 11 extends from the upper surface 10b to the lower surface 10 c.

The second member 20 is a plate-like member made of a material difficult to weld to the first member 10. The second member 20 coincides with the upper side of the first member 10. The second member 20 has a second through portion 21 penetrating in the thickness direction. The second through portion 21 opens at a position corresponding to the first through portion 11 of the first member 10. The upper surface of the first member 10 opened by the second through hole 21 of the second member 20 overlapping the first member 10 is an opening surface 10 a. The opening surface 10a corresponds to the upper surface of the first through portion 11. The second member 20 further has a peripheral edge 23 for defining the second through hole 21.

In the present embodiment, the second through hole 21 is described as a circular through hole, but may be an elliptical or elongated through hole. The through portion 21 may be a through groove. The through groove penetrates from the upper surface to the lower surface in the thickness direction of the second member 20. The through-groove is also open at both ends or one end in the longitudinal direction of the through-groove. In this regard, the through groove is different from the through hole having a long hole shape. The through hole having a long hole shape is closed at both ends in the longitudinal direction of the through hole. For example, when both ends of the through groove in the longitudinal direction are open, the second member 20 includes at least two independent plates disposed on the first member 10. The two plates are arranged with an elongated gap therebetween. The gap forms a through groove as a second through portion. When the second member 20 includes a plurality of independent plates and a plurality of through grooves are formed, the third member 30, which is a molten solder, is welded to the first member 10 via the plurality of through grooves, and the second member 20 is sandwiched between the third member 30 and the first member 10, thereby fixing the second member 20 to the first member 10.

The third member 30 is made of solder which is a metal material of the same kind as the first member 10. Here, the metal materials of the same kind are metals that can be welded to each other, and are metal materials having good welding bondability, such as between ferrous metal materials and between non-ferrous metal materials, as well as between the same materials. In other words, the homogeneous metal material is a homogeneous material having good compatibility with welding.

Specifically, the following combinations are given as combinations of the first member 10 and the third member 30 during welding. For example, as the combination of the iron-based metal materials, mild steel and mild steel, stainless steel and stainless steel, mild steel and high-strength steel (high-tensile steel), high-strength steel and high-strength steel, and the like are available. Further, as the nonferrous metal material, there are aluminum and aluminum, aluminum and aluminum alloy, aluminum alloy and aluminum alloy, and the like.

The second member 20, which is a different material, is a material different from the first member 10 and the third member 30, which are metal materials of the same type, and is a material difficult to weld to the first member 10 and the third member 30.

For example, when the first member 10 and the third member 30, which are metal materials of the same type, are made of an iron-based metal material, the second member 20, which is a different type, is made of a non-iron-based metal material such as a copper material or an aluminum material. Further, resin materials such as CFRP (Carbon Fiber Reinforced Plastics) and PET (polyethylene Terephthalate) can be cited as different materials from metal materials.

In the following description, a case will be described in which a mild steel material is used as the first member 10, an aluminum material is used as the second member 20, and a mild steel material is used as the third member 30 as the solder.

The arc welding machine 1 includes a nozzle 2 and a welding tip 3. The nozzle 2 supplies a shielding gas or the like to a welding position of the welding object. The welding tip 3 supplies a welding current to the third member 30.

The arc welding machine 1 generates the arc 5 by supplying a welding current while feeding the third member 30 to the first through portion 11 through the second through portion 21. The arc 5 is irradiated to the inner peripheral surface of the first through portion 11 of the first member 10 and the opening surface 10a which is the upper surface of the first member 10. The third member 30 melted by the arc 5 is melt-bonded to the inner peripheral surface of the first through portion 11 and the opening surface 10a of the first member 10. At this time, the amount of melting of the third member 30 is adjusted to such an extent that the third member does not flow down from below the first through portion 11. The amount of melting of the third member 30 may be adjusted to an amount that can partially protrude from the lower side of the first through portion 11. Thus, the third member 30 fusion-joined to the first through-hole 11 by arc welding has a wedge-like anchoring effect with respect to the first member 10, and the joining strength and reliability are further improved.

The melted third member 30 is gradually stacked on the opening surface 10a on the upper surface side of the first member 10 and inside the second through hole 21 of the second member, fills the second through hole 21, and then flows out to the peripheral edge 23 on the upper surface side of the second through hole 21 and spreads in a flange shape.

In the process where the melted third member 30 becomes the weld bead, the third member 30 is provided with a flange portion 31 that presses the peripheral edge portion 23 of the second through hole 21. The flange portion 31 extends radially outward from the second through hole 21 on a surface (upper surface in fig. 1) of the second member 20 on the side opposite to the first member 10.

Then, the third member 30 solidifies and contracts, so that the second member 20 is compressed by the flange portion 31 and the first member 10. By this compression, the second member 20, which is a dissimilar material, is fixed between the flange portion 31 and the first member 10.

As described above, according to the joining structure of the present embodiment, the first through portion 11 is provided in the first member 10, and the third member 30 is welded to the inner peripheral surface of the first through portion 11 and the open surface 10a of the first member 10, whereby the welding area of the third member 30 can be increased. This ensures the bonding strength between the first member 10, the second member 20, and the third member 30.

The convex portion of the third member 30 is formed by the inner peripheral surface of the first through portion 11 and the opening surface 10 a. The convex shape enlarges the surface area to be bonded. The convex shape exhibits an anchoring effect like a wedge, and further improves the bonding strength and reliability. The diameter of the first through hole 11 is smaller than the diameter of the second through hole 21 of the second member 20 (the diameter of the opening surface 10a of the first member 10 opened by the second through hole 21 of the second member 20). This enables welding while suppressing heat input to the first member 10 and the second member 20.

EXAMPLE 2

Hereinafter, the same portions as those in embodiment 1 are denoted by the same reference numerals, and only different points will be described.

As shown in fig. 2, the first member 10 has a first through-hole 11 penetrating in the thickness direction. The first through-hole 11 is formed by a circular through-hole.

The second member 20 has a second through-hole 21 that opens at a position corresponding to the first through-hole 11 of the first member 10. The second through hole 21 is defined by a peripheral edge 23. The peripheral edge portion 23 has a tapered portion 22 that tapers toward the first member 10.

The third component 30 is melted by the arc 5. The melted third member 30 flows toward the first through hole 11 along the tapered portion 22 of the second through hole 21, and is fusion-bonded to the inner peripheral surface of the first through hole 11 and the opening surface 10a of the first member 10. At this time, the amount of melting of the third member 30 is adjusted to such an extent that the third member does not flow down from below the first through portion 11.

Then, the melted third member 30 fills the second through hole 21, and expands in a flange shape on the upper surface of the tapered portion 22.

In the process where the melted third member 30 becomes a weld bead, the third member 30 is provided with a flange portion 31 that presses the tapered portion 22.

Then, the third member 30 solidifies and contracts, so that the second member 20 is compressed by the flange portion 31 and the first member 10. By this compression, the second member 20, which is a dissimilar material, is fixed between the flange portion 31 and the first member 10.

As described above, according to the joining structure of the present embodiment, the tapered portion 22 is provided in the peripheral edge portion 23, so that the melted third member 30 easily flows toward the first through portion 11. Further, by forming the flange portion 31 in a shape along the tapered portion 22, the thickness of the flange portion 31 protruding from the second member 20 can be suppressed.

EXAMPLE 3

As shown in fig. 3, the first member 10 has a first through-hole 11 penetrating in the thickness direction. The first through portion 11 is formed in a tapered shape that tapers toward the lower surface 10 c. That is, the first through portion 11 has a tapered shape. The first through hole 11 has an end 10d closer to the second member 20 in the thickness direction and an end 10e farther from the second member 20. The distal end 10e has a smaller dimension than the proximal end 10 d.

The second member 20 has a second through-hole 21 that opens at a position corresponding to the first through-hole 11 of the first member 10.

The third component 30 is melted by the arc 5. The melted third member 30 flows toward the inside of the first through portion 11 along the tapered shape of the first through portion 11, and is fusion-bonded to the inner peripheral surface of the first through portion 11 and the opening surface 10a of the first member 10. At this time, the melting amount of the third member 30 is adjusted to such an extent that the melted third member 30 does not flow down from below the first through portion 11.

The melted third member 30 flows out to the peripheral edge 23 on the upper surface side of the second member 20 after filling the second through hole 21, and spreads in a flange shape.

In the process where the melted third member 30 becomes a weld bead, the third member 30 is provided with a flange portion 31 that presses the peripheral edge portion 23.

Then, the third member 30 solidifies and contracts, so that the second member 20 is compressed by the flange portion 31 and the first member 10. By this compression, the second member 20, which is a dissimilar material, is fixed between the flange portion 31 and the first member 10.

As described above, according to the joining structure of the present embodiment, the first through-hole 11 is formed in the tapered shape that is tapered toward the lower surface 10c, so that the melted third member 30 easily flows toward the inside of the first through-hole 11.

EXAMPLE 4

As shown in fig. 4, the first member 10 has a first through-hole 11 penetrating in the thickness direction. The first through portion 11 is formed in a tapered shape that widens toward the lower surface 10 c. That is, the first through portion 11 has a tapered shape. The first through hole 11 has an end 10d closer to the second member 20 in the thickness direction and an end 10e farther from the second member 20. The distal end 10e has a larger dimension than the proximal end 10 d.

The second member 20 has a second through-hole 21 that opens at a position corresponding to the first through-hole 11 of the first member 10.

The third component 30 is melted by the arc 5. The melted third member 30 is fusion-bonded to the inner peripheral surface of the first through portion 11 and the opening surface 10a of the first member 10. At this time, the melting amount of the third member 30 is adjusted to such an extent that the melted third member 30 does not flow down from below the first through portion 11.

The melted third member 30 flows out to the peripheral edge 23 on the upper surface side of the second member 20 after filling the second through hole 21, and spreads in a flange shape.

In the process where the melted third member 30 becomes a weld bead, the third member 30 is provided with a flange portion 31 that presses the peripheral edge portion 23.

Then, the third member 30 solidifies and contracts, so that the second member 20 is compressed by the flange portion 31 and the first member 10. By this compression, the second member 20, which is a dissimilar material, is fixed between the flange portion 31 and the first member 10.

As described above, according to the bonding structure of the present embodiment, the first through portion 11 is formed in a tapered shape that widens toward the lower surface 10 c. Thus, when the melted third member 30 solidifies at the widened portion of the first through-hole 11, the third member 30 is fitted into the first through-hole 11, and the bonding strength can be improved.

EXAMPLE 5

As shown in fig. 5, the first through hole 11 includes a plurality of first small through holes 11 a. The first member 10 has a plurality of first small through-holes 11a penetrating in the thickness direction. The first small through hole 11a is formed by a circular through hole.

The second member 20 has one second through-hole 21 that opens at a position corresponding to the plurality of first small through-holes 11a of the first member 10.

The third component 30 is melted by the arc 5. The melted third member 30 is dispersed in the plurality of first small through-holes 11a and is melt-bonded to the inner peripheral surface of each first small through-hole 11a and the opening surface 10a of the first member 10. At this time, the melting amount of the third member 30 is adjusted to such an extent that the melted third member 30 does not flow down from below the first small through-hole 11 a.

The melted third member 30 flows out to the peripheral edge 23 on the upper surface side of the second member 20 after filling the second through hole 21, and spreads in a flange shape.

In the process where the melted third member 30 becomes a weld bead, the third member 30 is provided with a flange portion 31 that presses the peripheral edge portion 23.

Then, the third member 30 solidifies and contracts, so that the second member 20 is compressed by the flange portion 31 and the first member 10. By this compression, the second member 20, which is a dissimilar material, is fixed between the flange portion 31 and the first member 10.

As described above, according to the joining structure of the present embodiment, the melted third member 30 can be welded while being dispersed to the plurality of first small through-holes 11a by providing the plurality of first small through-holes 11 a. Further, the third member 30 is fitted into the plurality of first small through-holes 11a, whereby a wedge effect can be obtained in the plurality of first small through-holes 11a, and the joining stability is improved.

EXAMPLE 6

As shown in fig. 6, the first member 10 has a first through-hole 11 that penetrates in the thickness direction. The first through-hole 11 is formed by a circular through-hole.

The second member 20 has a second through-hole 21 that opens at a position corresponding to the first through-hole 11 of the first member 10.

The third component 30 is melted by the arc 5. The melted third member 30 is fusion-bonded to the inner peripheral surface of the first through portion 11 and the opening surface 10a of the first member 10. At this time, the melting amount of the third member 30 is adjusted to such an extent that the melted third member 30 extends from below the first through-hole 11 and spreads over the peripheral edge portion 13 on the lower surface side of the first through-hole 11.

The melted third member 30 flows out to the peripheral edge 23 on the upper surface side of the second member 20 after filling the second through hole 21, and spreads in a flange shape.

In the process where the melted third member 30 becomes the bead, the third member 30 is provided with a flange portion 31 that presses the peripheral edge portion 23 and a locking portion 32 that is locked to the peripheral edge portion 13.

Then, the third member 30 solidifies and contracts, so that the second member 20 is compressed by the flange portion 31 and the locking portion 32. By this compression, the first member 10 and the second member 20 are fixed between the flange portion 31 and the locking portion 32.

As described above, according to the engagement structure of the present embodiment, the engagement portion 32 can prevent the third member 30 from being disengaged from the first through-hole 11. Further, since the first member 10 and the second member 20 are fixed between the flange portion 31 and the locking portion 32, the joining strength can be improved.

EXAMPLE 7

As shown in fig. 7, the first through hole 11 includes a plurality of first small through holes 11 a. The first member 10 has a plurality of first small through-holes 11a penetrating in the thickness direction. The first small through hole 11a is formed by a circular through hole.

The second member 20 has one second through-hole 21 that opens at a position corresponding to the plurality of first small through-holes 11a of the first member 10.

The third component 30 is melted by the arc 5. The melted third member 30 is dispersed in the plurality of first small through-holes 11a and is melt-bonded to the inner peripheral surface of each first small through-hole 11a and the opening surface 10a of the first member 10. At this time, the melting amount of the third member 30 is adjusted to such an extent that the melted third member 30 extends from below the first small through-hole 11a and spreads over the peripheral edge portion 13 on the lower surface side of the first member 10. In the example shown in fig. 7, the third members 30 extending from below the plurality of first small through-holes 11a are connected to each other in a bridge shape.

The melted third member 30 flows out to the peripheral edge 23 on the upper surface side of the second member 20 after filling the second through hole 21, and spreads in a flange shape.

In the process where the melted third member 30 becomes the bead, the third member 30 is provided with a flange portion 31 that presses the peripheral edge portion 23 and a locking portion 32 that is locked to the peripheral edge portion 13.

Then, the third member 30 solidifies and contracts, so that the second member 20 is compressed by the flange portion 31 and the first member 10. By this compression, the first member 10 and the second member 20 are fixed between the flange portion 31 and the locking portion 32.

As described above, according to the joining structure of the present embodiment, the third member 30 can be prevented from being detached from the first small through-hole 11a by the locking portions 32 that extend from the lower side of the first small through-hole 11a and are connected in a bridge shape. Further, by setting the third member 30 to be fitted into the plurality of first small through-holes 11a, a wedge effect can be obtained in the plurality of first small through-holes 11a, and the joining stability is improved.

EXAMPLE 8

As shown in fig. 8, the first through hole 11 includes a plurality of first small through holes 11 a. The first member 10 has a plurality of first small through-holes 11a penetrating in the thickness direction. The first small through hole 11a is formed by a circular through hole. The plurality of first small through holes 11a penetrate in a direction inclined with respect to the thickness direction.

In the example shown in fig. 8, the left first small through hole 11a is inclined obliquely downward to the right. The right first small through-hole 11a is inclined obliquely downward leftward. Thus, the distance between the lower openings of the left and right first small through-holes 11a is shorter than the distance between the upper openings.

The second member 20 has one second through-hole 21 that opens at a position corresponding to the plurality of first small through-holes 11a of the first member 10.

The third component 30 is melted by the arc 5. The molten third member 30 flows obliquely downward while being dispersed toward the plurality of first small through-holes 11a, and is fusion-bonded to the inner peripheral surface of each first small through-hole 11a and the opening surface 10a of the first member 10. At this time, the melting amount of the third member 30 is adjusted to such an extent that the melted third member 30 extends from below the first small through-hole 11a and spreads over the peripheral edge portion 13 on the lower surface side of the first member 10. In the example shown in fig. 8, the third members 30 extending from below the plurality of first small through-holes 11a are connected to each other in a bridge shape.

The melted third member 30 flows out to the peripheral edge 23 on the upper surface side of the second member 20 after filling the second through hole 21, and spreads in a flange shape.

In the process where the melted third member 30 becomes the bead, the third member 30 is provided with a flange portion 31 that presses the peripheral edge portion 23 and a locking portion 32 that is locked to the peripheral edge portion 13.

Then, the third member 30 solidifies and contracts, so that the second member 20 is compressed by the flange portion 31 and the locking portion 32. By this compression, the first member 10 and the second member 20 are fixed between the flange portion 31 and the locking portion 32.

As described above, according to the joining structure of the present embodiment, since the plurality of first small through-holes 11a are inclined so that the distance between the lower openings is short, the third members 30 extending from the lower sides of the plurality of first small through-holes 11a are easily connected to each other in a bridge shape to form the locking portions 32. Further, the locking portion 32 can prevent the third member 30 from coming off the first small through-hole 11 a.

EXAMPLE 9

As shown in fig. 9, the first member 10 has a first through-hole 11 penetrating in the thickness direction. The first through-hole 11 is formed by a circular through-hole.

The second member 20 has a second through-hole 21 that opens at a position corresponding to the first through-hole 11 of the first member 10. A fixing member 40 is superposed on the upper surface of the second member 20.

The fixing member 40 is made of, for example, a metal material having a rectangular shape or a disk shape.

The external shape of the fixing member 40 may be any shape as long as it is a shape that presses the peripheral edge 23 of the second member 20.

The fixing member 40 is made of the same kind of metal material that can be welded to the first member 10 and the third member 30. The fixing member 40 may be made of a material different from the first member 10 and the third member 30.

A projection 41 having an embossed shape that projects out in a tapered shape toward the second member 20 is provided at the center of the fixing member 40. The protrusion 41 is inserted into the second through hole 21.

The fixing member 40 has a fixing hole 42 opened at a position corresponding to the second through portion 21 and the first through portion 11. The fixing hole 42 is formed in the bottom surface of the protrusion 41.

The third component 30 is melted by the arc 5. The melted third member 30 flows toward the first through hole 11 through the fixing hole 42 and the second through hole 21, and is fusion-bonded to the inner peripheral surface of the first through hole 11 and the opening surface 10a of the first member 10. The melted third member 30 is expanded in a flange shape on the upper surface of the fixing member 40.

In the process where the melted third member 30 becomes a weld bead, the third member 30 is provided with a flange portion 31 that presses the peripheral edge portion of the fixing hole 42 of the fixing member 40. The flange 31 indirectly presses the peripheral edge 23 of the second member 20 via the fixing member 40.

Then, the third member 30 solidifies and contracts, so that the second member 20 is compressed by the flange portion 31 and the first member 10. By this compression, the fixing member 40 and the second member 20 are fixed between the flange portion 31 and the first member 10.

As described above, according to the joining structure of the present embodiment, when the third member 30 is welded to the first through portion 11 of the first member 10, the flange portion 31 can be formed while suppressing the amount of heat input to the second member 20 by the fixing member 40. Further, the second member 20, which is a different material, can be sandwiched and fixed between the first member 10 and the fixing member 40.

EXAMPLE 10

As shown in fig. 10, the first member 10 has a first through-hole 11 penetrating in the thickness direction. The first through-hole 11 is formed by a circular through-hole.

The second member 20 has a second through-hole 21 that opens at a position corresponding to the first through-hole 11 of the first member 10.

The third component 30 is melted by the arc 5. The melted third member 30 is fusion-bonded to the inner peripheral surface of the first through portion 11 and the opening surface 10a of the first member 10.

At this time, the nozzle 2 of the arc welding machine 1 is rotated along the peripheral edge portion 23 of the second member 20, and the melted third member 30 is supplied to the peripheral edge portion 23. Thus, the melted third member 30 fills the second through hole 21 and spreads in a flange shape in the peripheral edge 23 on the upper surface side of the second member 20.

In the process where the melted third member 30 becomes a weld bead, the third member 30 is provided with a flange portion 31 that presses the peripheral edge portion 23.

Then, the third member 30 solidifies and contracts, so that the second member 20 is compressed by the flange portion 31 and the first member 10. By this compression, the second member 20, which is a dissimilar material, is fixed between the flange portion 31 and the first member 10.

As described above, according to the joining structure of the present embodiment, the nozzle 2 of the arc welding machine 1 is rotated to perform arc welding on the peripheral edge portion 23 of the second member 20 with a spiral trajectory of alternating current welding or short circuit welding based on low heat input, thereby forming the flange portion 31 while suppressing heat input.

EXAMPLE 11

As shown in fig. 11, the first member 10 has a first through-hole 11 penetrating in the thickness direction. The first through-hole 11 is formed by a circular through-hole.

The second member 20 has a stepped portion 25 that is open on a surface (upper surface in fig. 11) on the opposite side to the first member 10, and a second through portion 21 that is formed on the bottom surface of the stepped portion 25. The second through portion 21 opens at a position corresponding to the first through portion 11 of the first member 10.

The third component 30 is melted by the arc 5. The melted third member 30 is fusion-bonded to the inner peripheral surface of the first through portion 11 and the opening surface 10a of the first member 10.

The melted third member 30 flows out to the peripheral edge 23 on the upper surface side of the second member 20, that is, the bottom surface of the stepped portion 25 after filling the second through portion 21, and spreads in a flange shape.

In the process where the melted third member 30 becomes a weld bead, the third member 30 is provided with a flange portion 31 that presses the peripheral edge portion 23.

Then, the third member 30 solidifies and contracts, so that the second member 20 is compressed by the flange portion 31 and the first member 10. By this compression, the second member 20, which is a different material, is compressed and fixed between the flange portion 31 and the first member 10.

As described above, according to the joining structure of the present embodiment, the flange portion 31 of the third member 30 is disposed in the stepped portion 25, and the flange portion 31 can be prevented from bulging out of the second member 20.

EXAMPLE 12

As shown in fig. 12, the first member 10 has a first through-hole 11 penetrating in the thickness direction. The first through-hole 11 is formed by a circular through-hole.

The second member 20 has a stepped portion 25 that is open on a surface (upper surface in fig. 12) on the opposite side to the first member 10, and a second through portion 21 that is formed on the bottom surface of the stepped portion 25. The bottom surface of the step portion 25 is inclined toward the second through portion 21. The second through portion 21 opens at a position corresponding to the first through portion 11 of the first member 10.

The third component 30 is melted by the arc 5. The melted third member 30 flows along the inclined surface of the stepped portion 25 toward the second through hole 21, and then is melt-bonded to the inner peripheral surface of the first through hole 11 and the opening surface 10a of the first member 10.

The molten third member 30 flows out to the peripheral edge 23 on the upper surface side of the second member 20, that is, the bottom surface of the stepped portion 25 after filling the second through-hole 21, and spreads in a flange shape on the inclined surface of the stepped portion 25.

In the process where the molten third member 30 becomes the weld bead, the flange portion 31 that presses the inclined surface of the stepped portion 25 is provided on the third member 30.

Then, the third member 30 solidifies and contracts, so that the second member 20 is compressed by the flange portion 31 and the first member 10. By this compression, the second member 20, which is a dissimilar material, is fixed between the flange portion 31 and the first member 10.

As described above, according to the joining structure of the present embodiment, the bottom surface of the step portion 25 is inclined toward the second through hole 21, so that the melted third member 30 easily flows toward the second through hole 21. Further, by disposing the flange portion 31 of the third member 30 in the stepped portion 25, the flange portion 31 can be prevented from bulging out of the second member 20.

EXAMPLE 13

As shown in fig. 13, the first member 10 has a first through-hole 11 penetrating in the thickness direction. The first through-hole 11 is formed by a circular through-hole.

The second member 20 has a second through-hole 21 that opens at a position corresponding to the first through-hole 11 of the first member 10.

The third component 30 is melted by the arc 5. The third member 30 has a first joining portion 35 welded to the first member 10 and a second joining portion 36 welded to the first joining portion 35 to constitute the flange portion 31.

Specifically, when the melted third member 30 is welded to the first member 10 through the second through-hole 21, short-circuit welding is performed with a small spread of the arc 5 by heat input necessary for penetration, and the first joint portion 35 having a shape in which the upper center portion is recessed is formed. Thereafter, pulse welding with positive polarity or alternating current is performed in which the arc 5 is largely expanded with a low heat input to such an extent that the second member 20 is not melted, and the melted third member 30 is expanded along the shape of the upper central portion of the first joint portion 35 in which the upper central portion is recessed, thereby forming a second joint portion 36. This enables the flange portion 31 to be formed while suppressing the amount of heat input to the second member 20.

In the process where the melted third member 30 becomes a weld bead, the first joint portion 35 and the second joint portion 36 are provided in the third member 30. The first joint 35 is fusion-bonded to the inner peripheral surface of the first through portion 11 of the first member 10 and the opening surface 10a of the first member 10. The second joining portion 36 is fusion-bonded to the first joining portion 35, and constitutes the flange portion 31 that presses the peripheral edge portion 23.

Then, the third member 30 solidifies and contracts, so that the second member 20 is compressed by the flange portion 31 and the first member 10. By this compression, the second member 20, which is a dissimilar material, is fixed between the flange portion 31 and the first member 10.

As described above, according to the joining structure of the present embodiment, the third member 30 is formed separately from the first joining portion 35 and the second joining portion 36, whereby the welding method and the welding conditions can be used in a different manner in consideration of the material characteristics of the second member 20.

Other embodiments

The embodiment may be configured as follows.

In the present embodiment, the first through portion 11 of the first member 10 is arc-welded, but laser filler welding, for example, may be performed.

The combination of the shape of the first through hole 11 of the first member 10 and the shape of the second through hole 21 of the second member 20 described in the present embodiment is an example, and other combinations are possible.

Industrial applicability

As described above, the present invention is extremely useful and highly useful in industrial applications because it can obtain a highly practical effect that the welding area of the solder can be increased to secure the bonding strength.

Description of the reference numerals

10 first member

11 first through part

20 second component

21 second through hole

22 conical part

13. 23 peripheral edge part

25 step part

30 third structural component

31 flange part

32 locking part

35 first joint part

36 second joint part

40 fixing member

42 to secure the aperture.