阅读说明：本技术 接合结构 (Joint structure ) 是由 藤原润司 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未贯通的深度的非贯通孔(11)。第三构件(30)经由第二构件(20)的贯通部(21)而被焊接于非贯通孔(11)的内周面及底部和第一构件(10)的由第二构件(20)的贯通部(11)开口的开口面(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 non-through hole (11) having a depth not penetrating in the thickness direction is formed in the first member (10). The third member (30) is welded to the inner peripheral surface and the bottom of the non-through hole (11) and to the opening surface (10a) of the first member (10) that is opened by the through hole (11) of the second member (20) via the 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 non-through hole formed to a depth not penetrating in a thickness direction,

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

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

3. The joining structure of claim 1,

the 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 non-through hole has a flat bottom portion and an inclined portion inclined toward the bottom portion.

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

the non-through hole is formed in a tapered shape that is tapered toward the bottom of the non-through hole.

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

the non-through hole is formed in a tapered shape that widens toward the bottom of the non-through hole.

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

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

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 through portion and the non-through hole,

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

the flange portion presses a peripheral edge portion of the through 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 through portion is formed on 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 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 non-through hole has a smaller size than the through portion, and the opening surface is a region of the upper surface of the first member that is located within the through portion.

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 non-through hole formed in the upper surface, the first member being made of a metal material;

a second member having: a through portion that is opened at a position corresponding to the non-through hole and is larger than the non-through hole; and a peripheral edge portion that defines the through portion, 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 and a bottom portion of the non-through hole and a periphery of the non-through hole in the upper surface of the first member; and a flange portion connected to the soldering portion via the through portion and covering the peripheral edge portion, the third member being 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 non-through hole formed in the upper surface,

preparing a second member having a through portion and a peripheral edge portion defining the through portion 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 through-hole is located at a position corresponding to the non-through-hole and an opening surface of the first member that is opened by the through-hole 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 and a bottom portion of the non-through hole in the first member and the opening surface of the first member through the through portion,

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 non-through hole formed to a depth that does not penetrate in the thickness direction. The second member has a through-hole that opens at a position corresponding to the non-through-hole. The third member has a flange portion that presses a peripheral edge portion of the through-hole, and is arc-welded to an inner peripheral surface and a bottom portion of the non-through-hole in the first member and an opening surface of the first member that is opened by the through-hole of the second member via the through-hole. The second member is compressed by the flange portion and the first member by solidification shrinkage of the third member with respect to the first 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 non-through hole having a depth not penetrating in the thickness direction. The third member is arc-welded to an inner peripheral surface and a bottom portion of the non-through hole in the first member and an opening surface of the first member opened by the through-hole of the second member via the through-hole of the second member. The second member is compressed by the flange portion and the first member by solidification shrinkage of the third member, thereby fixing the second member between the flange portion of the third member and the first member.

In this way, by providing the non-through hole in the first member and arc-welding the third member to the inner peripheral surface and the bottom portion of the non-through hole and the opening surface of the first member opened by the through-hole of the second member, the welding area of the third member can be increased. In particular, when the first member has a plate thickness larger than that of the second member, the penetration into the first member can be ensured while minimizing the thermal influence on the second member.

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 through portion on a surface of the second member on a side opposite to the first member.

In the second aspect of the invention, the flange portion presses a surface of the second member on the side opposite to the first member, and the second member can be compressed and fixed between the flange portion and the first member.

In a third aspect of the invention, in the first aspect, the 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 easily flows toward the non-through hole. Further, the thickness of the flange portion protruding from the second member can be suppressed by solidifying the flange portion into a shape along the tapered portion.

In a fourth aspect of the invention, in any one of the first to third aspects of the invention, the non-through hole has a flat bottom portion and an inclined portion inclined toward the bottom portion.

In the fourth aspect of the invention, the inclined portion is provided in the non-through hole, so that the molten solder easily flows toward the bottom of the non-through hole. Further, by making the bottom of the non-through hole flat, the welding area of the third member can be increased to ensure the bonding strength.

In a fifth aspect of the invention, in any one of the first to third aspects, the non-through hole is formed in a tapered shape that tapers toward a bottom portion of the non-through hole.

In the fifth aspect of the invention, the non-through hole is tapered toward the bottom, so that the molten solder easily flows toward the bottom of the non-through hole.

In a sixth aspect of the invention, in any one of the first to third aspects, the non-through hole is formed in a tapered shape that widens toward a bottom of the non-through hole.

In the sixth aspect of the invention, the non-through hole is formed in a tapered shape that widens toward the bottom. Thus, when the melted solder solidifies in the widened portion of the non-through hole, the third member is fitted into the non-through hole, and the bonding strength can be improved.

In the seventh invention, in any one of the first to sixth inventions,

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

In the seventh aspect of the invention, the plurality of small non-through holes are provided, whereby the molten solder can be dispersed into the plurality of small non-through holes and can be soldered. Further, the third member is fitted into the plurality of small non-through holes, so that a wedge effect can be obtained in the plurality of small non-through holes, and the bonding stability 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 through-hole and the non-through-hole. The third member is arc-welded to an inner peripheral surface and a bottom portion of the non-through hole and an opening surface of the first member opened by the through-hole of the second member via the fixing hole and the through-hole. The flange portion presses a peripheral edge portion of the through 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.

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 and the bottom portion of the non-through hole and the opening surface of the first member opened by the through-hole of the second member via the fixing hole of the fixing member and the through-hole of the second member. The fixing member and the second member are compressed by the flange portion and the first member by solidification shrinkage of the third member, whereby the fixing member and the second member are fixed between the flange portion of the third member and the first member.

Thus, when the third member is arc-welded to the inner peripheral surface and the bottom portion of the non-through hole of the first member and the opening surface of the first member opened by the through portion 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 has a step portion opened on a surface opposite to the first member. The through part is formed on the bottom surface of the stepped part.

In the ninth aspect of the present invention, a 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 through portion.

In the tenth aspect of the invention, the bottom surface of the step portion is inclined toward the through portion, whereby the molten solder easily flows toward the through portion.

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 through portion, short-circuit soldering with less arc spread may be performed with 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 non-through hole has a size smaller than that of the through portion. The opening surface is a region of the upper surface of the first member located within the through portion.

In this way, the diameter of the non-through hole is smaller than the diameter of the through-hole of the second member (the diameter of the opening surface of the first member that is opened by the through-hole of the second member). This enables welding while suppressing heat input to the first member and the second member. The convex shape of the third member is formed by the inner peripheral surface, the bottom surface, and the opening surface of the non-through hole. 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 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 non-through hole formed in an upper surface. The first member is composed of a metal material. The second member has a through-hole larger than the non-through-hole and a peripheral edge portion defining the 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 through-hole is open at a position corresponding to the non-through-hole. The third member has a welded portion and a flange portion connected to the welded portion via a through portion. The welding portion is arc-welded to the inner peripheral surface and the bottom of the non-through hole and the periphery of the non-through hole 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 non-through hole in the first member and arc-welding the third member to the inner peripheral surface and the bottom portion of the non-through hole and the opening surface of the first member opened by the through-hole of the second member, the welding area of the third member can be increased. In particular, when the first member has a plate thickness larger than that of the second member, the penetration into the first member can be ensured while minimizing the thermal influence on the second 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 non-through hole formed in an upper surface. The first member is composed of a metal material. The second member has a through portion and a peripheral edge portion defining the through 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 such that the through-hole is located at a position corresponding to the non-through-hole and an opening surface of the first member that is opened by the through-hole is formed. The third member is formed by arc welding to the inner peripheral surface and the bottom of the non-through hole in the first member and the opening surface of the first member through the 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 non-through hole having a depth not penetrating in the thickness direction. The third member is arc-welded to an inner peripheral surface and a bottom portion of the non-through hole in the first member and an opening surface of the first member opened by the through-hole of the second member via the through-hole of the second member. The second member is compressed by the flange portion and the first member by solidification shrinkage of the third member, thereby fixing the second member between the flange portion of the third member and the first member.

In this way, by providing the non-through hole in the first member and arc-welding the third member to the inner peripheral surface and the bottom portion of the non-through hole and the opening surface of the first member opened by the through-hole of the second member, the welding area of the third member can be increased. In particular, when the first member has a plate thickness larger than that of the second member, the penetration into the first member can be ensured while minimizing the thermal influence on the second 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.

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 non-through hole 11 formed to a depth not penetrating in the thickness direction. In the example shown in fig. 1, the non-through hole 11 is formed by a circular recess that opens upward. The non-through hole 11 is formed as a non-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 non-penetrating portion 11 extends from the upper surface 10b toward 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 circular-shaped through portion 21. The through portion 21 opens at a position corresponding to the non-through hole 11 of the first member 10. The upper surface of the first member 10 opened by the 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 non-through hole 11. The second member 20 also has a peripheral edge 23 for defining the through portion 21.

In the present embodiment, the 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 the through portion 21. 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 as a solder to the non-through hole 11 through the through portion 21. The arc 5 is irradiated to the inner peripheral surface and the bottom surface (bottom) of the non-through hole 11 in the first member 10, and the opening surface 10a as 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 and the bottom surface of the non-through hole 11, and is gradually stacked on the opening surface 10a on the upper surface side of the first member 10 and the through portion 21 of the second member. 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 through portion 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 through portion 21. The flange portion 31 protrudes radially outward from the through portion 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 non-through hole 11 is provided in the first member 10, and the third member 30 is arc-welded to the inner peripheral surface and the bottom surface of the non-through hole 11 of the first member 10 and the opening surface 10a, whereby the welding area of the third member 30 can be increased. In particular, when the plate thickness of the first member 10 is larger than the plate thickness of the second member 20, the penetration into the first member 10 can be ensured while minimizing the thermal influence on the second member 20. The inner peripheral surface and the bottom surface of the non-through hole 11 and the opening surface 10a form a convex shape of the third member 30. 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 non-through portion 11 is smaller than the diameter of the through portion 21 of the second member 20 (the diameter of the opening surface 10a of the first member 10 opened by the through portion 21 of the second member 20). This enables welding while suppressing heat input to the first member 10 and the second member 20.

This ensures the bonding strength between the first member 10, the second member 20, and the third member 30.

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 non-through hole 11 formed to a depth that does not penetrate in the thickness direction. The non-through hole 11 is formed by a circular recess opening upward.

The second member 20 has a through portion 21 that opens at a position corresponding to the non-through hole 11 of the first member 10. The through portion 21 is defined by a peripheral edge portion 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 non-through hole 11 along the tapered portion 22 of the through hole 21, and is melt-bonded to the inner peripheral surface and bottom of the non-through hole 11 and the opening surface 10a of the first member 10.

Then, the melted third member 30 fills the through portion 21, thereby expanding 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 bonding 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 non-through hole 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 non-through hole 11 formed to a depth that does not penetrate in the thickness direction. The non-through hole 11 has a flat bottom portion 12 and an inclined portion 13 inclined toward the bottom portion 12.

The second member 20 has a through portion 21 that opens at a position corresponding to the non-through hole 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 portion 13 of the non-through hole 11 toward the bottom portion 12, and is melt-bonded to the inner peripheral surface and bottom portion of the non-through hole 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 after filling the 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 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 inclined portion 13 is provided in the non-through hole 11, so that the melted third member 30 easily flows toward the bottom portion 12 of the non-through hole 11. Further, by making the bottom portion 12 of the non-through hole 11 flat, the welding area of the third member 30 can be increased to ensure the bonding strength.

EXAMPLE 4

As shown in fig. 4, the first member 10 has a non-through hole 11 formed to a depth that does not penetrate in the thickness direction. The non-through hole 11 is formed in a tapered shape that is tapered toward the bottom of the non-through hole 11.

The second member 20 has a through portion 21 that opens at a position corresponding to the non-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 bottom of the non-through hole 11 along the tapered shape of the non-through hole 11, and is melt-bonded to the inner peripheral surface and bottom of the non-through hole 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 after filling the 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 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 non-through hole 11 is formed in a tapered shape that is tapered toward the bottom, so that the melted third member 30 easily flows toward the bottom of the non-through hole 11.

EXAMPLE 5

As shown in fig. 5, the non-through holes 11 include a plurality of small non-through holes 11 a. The first member 10 has a plurality of small non-through holes 11a formed to a depth not penetrating in the thickness direction. The small non-through hole 11a is formed by a circular recess opening upward.

The second member 20 has one through-hole 21 that opens at a position corresponding to the plurality of small non-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 to the plurality of small non-through holes 11a and is melt-bonded to the inner peripheral surface and bottom of each small non-through hole 11a 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 after filling the 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 is solidified and contracted with respect to the first member 10, whereby 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 plurality of small non-through holes 11a are provided, so that the melted third member 30 can be welded while being dispersed to the plurality of small non-through holes 11 a. Further, the third member 30 is fitted into the plurality of small non-through holes 11a, so that a wedge effect can be obtained in the plurality of small non-through holes 11a, and the bonding stability can be improved.

EXAMPLE 6

As shown in fig. 6, the first member 10 has a non-through hole 11 formed to a depth that does not penetrate in the thickness direction. The non-through holes 11 are formed in a tapered shape that widens toward the bottom of the non-through holes 11.

The second member 20 has a through portion 21 that opens at a position corresponding to the non-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 and bottom of the non-through hole 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 after filling the 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 is solidified and contracted with respect to the first member 10, whereby 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 non-through hole 11 is formed in a tapered shape that widens toward the bottom. Thus, when the melted third member 30 solidifies at the widened portion of the non-through hole 11, the third member 30 is fitted into the non-through hole 11, and the bonding strength can be improved.

EXAMPLE 7

As shown in fig. 7, the first member 10 has a non-through hole 11 formed to a depth that does not penetrate in the thickness direction. The non-through hole 11 is formed by a circular recess opening upward.

The second member 20 has a through portion 21 that opens at a position corresponding to the non-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 through portion 21.

The fixing member 40 has a fixing hole 42 opened at a position corresponding to the through portion 21 and the non-through hole 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 non-through hole 11 through the fixing hole 42 and the through portion 21, and is melt-bonded to the inner peripheral surface and the bottom of the non-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 non-through hole 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 8

As shown in fig. 8, the first member 10 has a non-through hole 11 formed to a depth that does not penetrate in the thickness direction. The non-through hole 11 is formed by a circular recess opening upward.

The second member 20 has a through portion 21 that opens at a position corresponding to the non-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 and bottom of the non-through hole 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 through portion 21 and spreads in a flange shape in the peripheral edge portion 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 is solidified and contracted with respect to the first member 10, whereby 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 9

As shown in fig. 9, the first member 10 has a non-through hole 11 formed to a depth that does not penetrate in the thickness direction. The non-through hole 11 is formed by a circular recess opening upward.

The second member 20 has a stepped portion 25 that is open on a surface (upper surface in fig. 9) on the opposite side to the first member 10, and a through portion 21 that is formed on the bottom surface of the stepped portion 25. The through portion 21 opens at a position corresponding to the non-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 and bottom of the non-through hole 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 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 10

As shown in fig. 10, the first member 10 has a non-through hole 11 formed to a depth that does not penetrate in the thickness direction. The non-through hole 11 is formed by a circular recess opening upward.

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

The third component 30 is melted by the arc 5. The molten third member 30 flows along the inclined surface of the stepped portion 25 toward the through portion 21, and then is fusion-bonded to the inner peripheral surface and the bottom of the non-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 through portion 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 through portion 21, so that the melted third member 30 easily flows toward the through portion 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 11

As shown in fig. 11, the first member 10 has a non-through hole 11 formed to a depth that does not penetrate in the thickness direction. The non-through hole 11 is formed by a circular recess opening upward.

The second member 20 has a through portion 21 that opens at a position corresponding to the non-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 penetration portion 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 third member 30 is provided with the first joint 35 and the second joint 36. The first joint 35 is fusion-bonded to the inner peripheral surface and the bottom of the non-through hole 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, arc welding is performed on the non-through hole 11 of the first member 10, but laser filler welding, for example, may be performed.

The combination of the shape of the non-through hole 11 of the first member 10 and the shape of the through-hole 21 of the second member 20 described in the present embodiment is an example, and other combinations may be used.

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 non-through hole

12 bottom

13 inclined part

20 second component

21 penetration part

22 conical part

23 peripheral edge part

25 step part

30 third structural component

31 flange part

35 first joint part

36 second joint part

40 fixing member

42 to secure the aperture.