阅读说明：本技术 一种不锈钢微型管焊接工艺 (Welding process for stainless steel micro pipe ) 是由 杨永磊 陈俊 李玲 徐海涛 杨旭 杜亮 帅宇 陈军舰 谢文奋 刘永华 陈文忠 于 2021-06-09 设计创作，主要内容包括：本发明涉及微型管焊接技术领域,具体是一种不锈钢微型管焊接工艺,用于解决现有技术中对不锈钢微型管的焊接存在抗拉强度、塑性和韧性都较差,焊接成本高和劳动强度大的问题。本发明包括以下步骤：步骤S1：固定不锈钢微型管,步骤S2：组对不锈钢微型管,步骤S3：调整接口,步骤S4：点燃微型焊枪,步骤S5：清理,步骤S6：对不锈钢微型管预热,步骤S7：判断不锈钢微型管的温度,步骤S8：熔化铜米丝,步骤S9：铺开铜米丝熔滴,步骤S10：调整,步骤S11：检验。本发明通过上述工艺焊接出来的不锈钢微型管具有更好的连接质量,抗拉强度、塑性和韧性更好,同时有效的降低了连接成本和劳动强度,保证不锈钢微型管的连接接头的使用寿命。(The invention relates to the technical field of micro-pipe welding, in particular to a welding process of a stainless steel micro-pipe, which is used for solving the problems of poor tensile strength, plasticity and toughness, high welding cost and high labor intensity in the welding of the stainless steel micro-pipe in the prior art. The invention comprises the following steps: step S1: fixing the stainless steel microtube, step S2: assembling the stainless steel microtubes, step S3: interface adjustment, step S4: igniting the micro welding gun, and step S5: cleaning, step S6: preheating the stainless steel microtubes, step S7: judging the temperature of the stainless steel microtube, step S8: melting the copper rice wire, step S9: spreading copper rice wire molten drops, and step S10: adjustment, step S11: and (6) checking. The stainless steel micro pipe welded by the process has better connection quality, better tensile strength, plasticity and toughness, effectively reduced connection cost and labor intensity and ensured service life of the connection joint of the stainless steel micro pipe.)

1. A welding process of stainless steel micro-tubes is characterized in that: the method comprises the following steps:

step S1: fixing the stainless steel microtubes (7), and respectively and relatively fixing the two to-be-welded stainless steel microtubes (7) on welding equipment;

step S2: assembling the stainless steel microtubes (7) to ensure that the two to-be-welded stainless steel microtubes (7) are positioned on the same straight line;

step S3: the interface is adjusted, the interface of the stainless steel micro pipe (7) to be welded is adjusted, and the gap of the interface is within the expansion coefficient of the stainless steel micro pipe (7);

step S4: igniting the micro welding gun (8), igniting the micro welding gun (8) and adjusting the flame to make the flame of the micro welding gun (8) be neutral flame;

step S5: cleaning, namely performing burr cleaning on the stainless steel micro pipe (7) to be welded to avoid defects during welding;

step S6: preheating the stainless steel microtube (7), and preheating the butt joint port of the stainless steel microtube (7) to turn the butt joint port of the stainless steel microtube (7) blue, so as to provide conditions for adding copper rice filaments (9);

step S7: judging the temperature of the stainless steel micro-pipe (7), adding the copper rice wires (9) and judging the temperature of the interface of the stainless steel micro-pipe (7) at the same time, so that the color of the stainless steel micro-pipe is rust red, and the fusion of the molten drops of the copper rice wires (9) and the interface of the stainless steel micro-pipe (7) is ensured;

step S8: melting the copper rice wire (9), adding the copper rice wire (9) to melt the copper rice wire, and dripping the melted copper rice wire to an interface of the stainless steel micro tube (7);

step S9: spreading molten drops of the copper nanowires (9), spreading the molten drops dropping to the interface of the stainless steel microtube (7), and ensuring smooth transition of the interface of the stainless steel microtube (7);

step S10: adjusting, namely adjusting the spatial position of the stainless steel micro-tube (7) until copper rice wire (9) molten drops are laid at the interface of the whole stainless steel micro-tube (7);

step S11: and (6) testing, namely, introducing water into the welded stainless steel pipe for testing.

2. The process of claim 1, wherein the welding process comprises: welding equipment includes base (1), two stand (4) are installed relatively to the top surface of base (1), two drill chuck (6) are all installed through bearing (11) on the upper portion of stand (4), bearing (11) are installed on stand (4) through bearing housing (5), the side-mounting of drill chuck (6) has hand wheel (12).

3. The process of claim 2, wherein: the top surface of the base (1) is provided with a rib plate (3), the rib plate (3) is internally provided with a magnetic disc (2), and the upright post (4) penetrates through the rib plate (3) and the lower end of the upright post (4) to be arranged on the top surface of the magnetic disc (2).

4. The process of claim 2, wherein: and a lock pin (10) is arranged on the bearing sleeve (5).

5. The process of claim 1, wherein the welding process comprises: in the step S4, the flame core temperature of the flame of the miniature welding gun (8) is tested to be 950-980 ℃ by an infrared temperature measuring gun.

6. The process of claim 1, wherein the welding process comprises: in the step S7, the temperature of the interface of the stainless steel microtube (7) is tested to be 950-980 ℃ by an infrared temperature measuring gun.

7. The process of claim 1, wherein the welding process comprises: in the step S9, one end of the copper wire (9) is aligned with the joint of the stainless steel micro tube (7) and is 2-4 mm away from the flame center of the micro welding gun (8), and the melting point diameter of the melted copper wire (9) is 0.2-0.4 mm.

Technical Field

The invention relates to the technical field of stainless steel pipe welding, in particular to the technical field of stainless steel micro pipe welding, and more particularly relates to a welding process of a stainless steel micro pipe.

Background

The material is a stainless steel microtube with the diameter less than 0.2 mm and the thickness less than 0.2 mm, the microtube with the same small needle head is generally arranged on key parts of precision equipment such as instruments, air conditioners and the like, the small parts are mutually connected in the past by using the connection modes such as tin soldering or expansion joint and the like, permanent complete combination and complete sealing are difficult to realize, the common hot-melt welding process is difficult to complete, mainly because the workpiece is too small and needs little heat, the heat dissipation is slow and the temperature rise is very fast, an operator is difficult to control and is easy to collapse, weld beading and blockage, and more, the workpiece is melted in a large range to cause scrap.

In the prior art, a soldering process is a welding method which utilizes a metal solder with a low melting point to be heated and melted and then to penetrate into and fill gaps at the joint of metal parts, the soldering can be used for welding non-BX material fine workpieces, but the melting point of tin is very low, and the tin can be melted if an over-temperature phenomenon occurs when precision equipment such as instruments, air conditioners and the like are used, so that the joint connection is failed, and the service life of the equipment is even influenced; the expansion joint process belongs to a cold machining process, workpieces cannot be melted and are tightly attached together, so that the workpieces can be loosened under the influence of environmental temperature or external load, firmness is poor or stripped, and the joints of the connection points are often higher than the joints of the base metal bodies and are not attractive.

In summary, in the prior art, the welding of the stainless steel microtube has the defects that the tensile strength, plasticity and toughness of the welded stainless steel microtube are poor, the welding cost is high, the labor intensity is high, and the service life of the connecting joint is far shorter than that of the base metal body. In order to solve the problems existing in the prior art of welding the stainless steel micro-tube, a welding process of the stainless steel micro-tube is particularly provided.

Disclosure of Invention

Based on the problems, the invention provides a welding process of a stainless steel micro pipe, which is used for solving the problems that the welding of the stainless steel micro pipe in the prior art has poor tensile strength, plasticity and toughness, high welding cost and high labor intensity, and the service life of a connecting joint is far shorter than that of a base metal body. According to the invention, the flame temperature is accurately controlled by the miniature welding gun, the welding wire molten drop amount is accurately controlled by using a specially-made micron welding wire, the temperature color of the base metal is accurately judged, the molten drop spreading state of the welding wire is accurately controlled, the distance between the welding wire and the flame core is accurately controlled, and the stainless steel miniature pipe welded by a special process has better connection quality, better tensile strength, plasticity and toughness, effectively reduced connection cost and labor intensity and ensured service life of a connection joint of the stainless steel miniature pipe.

The invention specifically adopts the following technical scheme for realizing the purpose:

a welding process of stainless steel microtubes comprises the following steps:

step S1: fixing the stainless steel microtubes, and respectively and relatively fixing two to-be-welded stainless steel microtubes on welding equipment;

step S2: assembling the stainless steel microtubes, and enabling the two to-be-welded stainless steel microtubes to be positioned on the same straight line;

step S3: the interface is adjusted, the interface of the stainless steel micro pipe to be welded is adjusted, no misalignment amount is ensured, and the gap is within the expansion coefficient of the stainless steel micro pipe;

step S4: igniting the micro welding gun, igniting the micro welding gun and adjusting the flame to make the flame of the micro welding gun be neutral;

step S5: cleaning, namely performing burr cleaning on a stainless steel micro pipe to be welded to avoid defects during welding;

step S6: preheating the stainless steel micro-pipe, and preheating the butt joint of the stainless steel micro-pipe to turn the butt joint of the stainless steel micro-pipe blue, so as to provide conditions for adding copper rice filaments;

step S7: judging the temperature of the stainless steel micro-tube, adding the copper wire and judging the temperature of the stainless steel micro-tube interface at the same time, so that the color of the stainless steel micro-tube interface is rust red, and fusing the molten drops of the copper wire and the stainless steel micro-tube interface is ensured;

step S8: melting the copper rice wire, adding the copper rice wire to melt the copper rice wire, and dripping the copper rice wire to an interface of the stainless steel micro tube;

step S9: spreading copper nanowire molten drops, spreading the molten drops dropping to the interface of the stainless steel micro pipe, and ensuring smooth transition and good adhesion of the interface of the stainless steel micro pipe;

step S10: adjusting, namely adjusting the spatial position of the stainless steel micro-tube until copper wire molten drops are laid at the interface of the whole stainless steel micro-tube;

step S11: and (6) testing, namely, introducing water into the welded stainless steel pipe for testing.

The welding equipment comprises a base, wherein two stand columns are oppositely arranged on the top surface of the base, a drill chuck is arranged on the upper portion of each stand column through a bearing, the bearing is arranged on each stand column through a bearing sleeve, and a hand wheel is arranged on the side face of each drill chuck.

The top surface of the base is provided with a rib plate, a magnetic disc is arranged in the rib plate, and the stand column penetrates through the rib plate and the lower end of the stand column is arranged on the top surface of the magnetic disc.

And a lock pin is arranged on the bearing sleeve.

In the step S4, the flame core temperature of the flame of the miniature welding gun is tested to be 950-980 ℃ through the infrared temperature measuring gun.

In the step S7, the temperature of the stainless steel micro-pipe interface is tested to be 950-980 ℃ by an infrared temperature measuring gun.

In the step S9, one end of the copper wire is aligned with the stainless steel micro pipe joint and is 2-4 mm away from the flame core of the micro welding gun, and the melting point diameter of the melted copper wire is 0.2-0.4 mm.

The invention has the following beneficial effects:

(1) according to the invention, the flame temperature is accurately controlled by the miniature welding gun, the welding wire molten drop amount is accurately controlled by using a specially-made micron welding wire, the temperature color of the base metal is accurately judged, the molten drop spreading state of the welding wire is accurately controlled, the distance between the welding wire and the flame core is accurately controlled, and the stainless steel miniature pipe welded by a special process has better connection quality, better tensile strength, plasticity and toughness, effectively reduced connection cost and labor intensity and ensured service life of a connection joint of the stainless steel miniature pipe.

(2) Compared with the prior art, the welding process has the advantages of simpler operation and higher welding speed, and because the welded stainless steel miniature pipe has better quality, the welded stainless steel miniature pipe can be prevented from being broken in the using process, the potential safety hazard and the potential quality hazard are reduced, and the production and material cost is saved.

Drawings

FIG. 1 is a flow chart of a welding process of the present invention;

FIG. 2 is a schematic front view of the welding apparatus of the present invention;

reference numerals: the welding device comprises a base 1, a magnetic disc 2, a rib plate 3, a stand column 4, a bearing sleeve 5, a drill chuck 6, a stainless steel micro pipe 7, a micro welding gun 8, a copper wire 9, a lock pin 10, a bearing 11 and a hand wheel 12.

Detailed Description

For a better understanding of the present invention by those skilled in the art, the present invention will be described in further detail below with reference to the accompanying drawings and the following examples.

Example 1:

as shown in fig. 1-2, a welding process for stainless steel microtubes 7 includes the following steps:

step S1: fixing the stainless steel microtubes 7, and respectively and oppositely fixing the two to-be-welded stainless steel microtubes 7 on welding equipment, so that the assembly, adjustment, welding and polishing are facilitated;

step S2: assembling the stainless steel microtubes 7, and enabling the two to-be-welded stainless steel microtubes 7 to be positioned on the same straight line;

step S3: the interface is adjusted, the interface of the stainless steel miniature pipe 7 to be welded is adjusted, no misalignment is ensured, and the gap is within the expansion coefficient of the stainless steel miniature pipe 7;

step S4: igniting the micro welding gun 8, igniting the micro welding gun 8 and adjusting the flame, so that the flame of the micro welding gun 8 is neutral, and testing the flame core temperature of the flame of the micro welding gun 8 to be 950 ℃ through an infrared temperature measuring gun;

step S5: cleaning, namely performing burr cleaning on the stainless steel micro pipe 7 to be welded to avoid defects during welding;

step S6: preheating the stainless steel microtube 7, and preheating the butt joint port of the stainless steel microtube 7 to ensure that the butt joint port of the stainless steel microtube 7 turns blue, thereby providing conditions for adding the copper nanowires 9;

step S7: judging the temperature of the stainless steel micro pipe 7, adding the copper rice wires 9, judging the temperature of the interface of the stainless steel micro pipe 7 at the same time, enabling the color of the interface to be rust red, ensuring that the melting point of the copper rice wires 9 is the same as or close to that of the copper rice wires 9, ensuring that molten drops of the copper rice wires 9 are fused with the interface of the stainless steel micro pipe 7, and testing the temperature of the interface of the stainless steel micro pipe 7 to be 950 ℃ through an infrared temperature measuring gun;

step S8: melting the copper nanowires 9, adding the copper nanowires 9 to melt the copper nanowires, and dripping the melted copper nanowires to the interface of the stainless steel microtube 7;

step S9: spreading molten drops of the copper nanowires 9, spreading the molten drops dropping to an interface of the stainless steel micro tube 7, and ensuring that the interface of the stainless steel micro tube 7 is smoothly transited and bonded well, wherein one end of the copper nanowires 9 is aligned to a joint of the stainless steel micro tube 7 and is 2 mm away from a flame core of a micro welding gun 8, and the melting point diameter of the melted copper nanowires 9 is 0.2 mm;

step S10: adjusting, namely rotating a hand wheel 12 to drive a stainless steel micro pipe 7 to rotate through a drill chuck 6, and adjusting the space position of the stainless steel micro pipe 7 until copper rice wire 9 molten drops are laid at the interface of the whole stainless steel micro pipe 7;

step S11: and (4) inspecting, namely inspecting water flowing into the welded stainless steel pipe, carefully inspecting the interface after water flowing, and ensuring that the interface is flat and smooth and is air-permeable and water-tight.

Wherein, welding equipment includes base 1, two stands 4 are installed relatively to base 1's top surface, the drill chuck 6 is all installed through bearing 11 on the upper portion of two stands 4, bearing 11 passes through bearing housing 5 and installs on stand 4, the side-mounting of drill chuck 6 has hand wheel 12, gusset 3 is installed to base 1's top surface, install magnetic disc 2 in the gusset 3, stand 4 passes gusset 3 and stand 4's lower extreme and installs the top surface at magnetic disc 2, install lockpin 10 on the bearing housing 5, lockpin 10 is used for locking the miniature drill chuck 6 of one end, it is rotatory to prevent miniature drill chuck 6 among the operation process, influence the operation, influence the quality. Magnetic disc 2 one side utilizes magnetic connection base 1, the another side passes through steel bushing welded connection stand 4 and uses gusset 3 interconnect, gusset 3 utilizes magnetic connection magnetic disc 2, both sides through welded connection stand 4, stand 4 one end utilizes steel bushing welded connection in magnetic disc 2 one side, welded connection gusset 3 is passed through to both sides, base 1 utilizes magnetic connection magnetic disc 2, miniature drill chuck 6 passes through bearing 11 and 5 interconnect of bearing housing for the miniature pipe 7 of fixed support stainless steel.

Example 2:

referring to fig. 1-2, a welding process of a stainless steel micro tube 7 based on the common welding equipment of the above embodiment 1 comprises the following steps:

step S1: fixing the stainless steel microtubes 7, and respectively and oppositely fixing the two to-be-welded stainless steel microtubes 7 on welding equipment, so that the assembly, adjustment, welding and polishing are facilitated;

step S2: assembling the stainless steel microtubes 7, and enabling the two to-be-welded stainless steel microtubes 7 to be positioned on the same straight line;

step S3: the interface is adjusted, the interface of the stainless steel miniature pipe 7 to be welded is adjusted, no misalignment is ensured, and the gap is within the expansion coefficient of the stainless steel miniature pipe 7;

step S4: igniting the micro welding gun 8, igniting the micro welding gun 8 and adjusting flame, so that the flame of the micro welding gun 8 is neutral, and testing the flame core temperature of the flame of the micro welding gun 8 to be 965 ℃ by an infrared temperature measuring gun;

step S5: cleaning, namely performing burr cleaning on the stainless steel micro pipe 7 to be welded to avoid defects during welding;

step S6: preheating the stainless steel microtube 7, and preheating the butt joint port of the stainless steel microtube 7 to ensure that the butt joint port of the stainless steel microtube 7 turns blue, thereby providing conditions for adding the copper nanowires 9;

step S7: judging the temperature of the stainless steel micro tube 7, adding the copper rice wires 9, judging the temperature of the interface of the stainless steel micro tube 7 at the same time, enabling the color of the interface to be rust red, ensuring that the melting point of the copper rice wires 9 is the same as or close to the melting point of the copper rice wires 9, ensuring that molten drops of the copper rice wires 9 are fused with the interface of the stainless steel micro tube 7, and testing the temperature of the interface of the stainless steel micro tube 7 to be 965 ℃ through an infrared temperature measuring gun;

step S8: melting the copper nanowires 9, adding the copper nanowires 9 to melt the copper nanowires, and dripping the melted copper nanowires to the interface of the stainless steel microtube 7;

step S9: spreading molten drops of the copper nanowires 9, spreading the molten drops dropping to an interface of the stainless steel micro tube 7, and ensuring that the interface of the stainless steel micro tube 7 is smoothly transited and bonded well, wherein one end of the copper nanowires 9 is aligned to a joint of the stainless steel micro tube 7 and is 3 mm away from a flame core of a micro welding gun 8, and the melting point diameter of the melted copper nanowires 9 is 0.3 mm;

step S10: adjusting, namely rotating a hand wheel 12 to drive a stainless steel micro pipe 7 to rotate through a drill chuck 6, and adjusting the space position of the stainless steel micro pipe 7 until copper rice wire 9 molten drops are laid at the interface of the whole stainless steel micro pipe 7;

step S11: and (4) inspecting, namely inspecting water flowing into the welded stainless steel pipe, carefully inspecting the interface after water flowing, and ensuring that the interface is flat and smooth and is air-permeable and water-tight.

Example 3:

referring to fig. 1-2, a welding process of a stainless steel micro tube 7 based on the common welding equipment of the above embodiment 1 comprises the following steps:

step S1: fixing the stainless steel microtubes 7, and respectively and oppositely fixing the two to-be-welded stainless steel microtubes 7 on welding equipment, so that the assembly, adjustment, welding and polishing are facilitated;

step S2: assembling the stainless steel microtubes 7, and enabling the two to-be-welded stainless steel microtubes 7 to be positioned on the same straight line;

step S3: the interface is adjusted, the interface of the stainless steel miniature pipe 7 to be welded is adjusted, no misalignment is ensured, and the gap is within the expansion coefficient of the stainless steel miniature pipe 7;

step S4: igniting the micro welding gun 8, igniting the micro welding gun 8 and adjusting the flame, so that the flame of the micro welding gun 8 is neutral, and testing the flame core temperature of the flame of the micro welding gun 8 to be 980 ℃ through an infrared temperature measuring gun;

step S5: cleaning, namely performing burr cleaning on the stainless steel micro pipe 7 to be welded to avoid defects during welding;

step S6: preheating the stainless steel microtube 7, and preheating the butt joint port of the stainless steel microtube 7 to ensure that the butt joint port of the stainless steel microtube 7 turns blue, thereby providing conditions for adding the copper nanowires 9;

step S7: judging the temperature of the stainless steel micro pipe 7, adding the copper rice wires 9, and judging the temperature of the interface of the stainless steel micro pipe 7 at the same time, so that the color of the stainless steel micro pipe 7 is rust red, the temperature is the same as or similar to the melting point of the copper rice wires 9, the molten drops of the copper rice wires 9 are ensured to be fused with the interface of the stainless steel micro pipe 7, and the temperature of the interface of the stainless steel micro pipe 7 is tested to be 980 ℃ by an infrared temperature measuring gun;

step S8: melting the copper nanowires 9, adding the copper nanowires 9 to melt the copper nanowires, and dripping the melted copper nanowires to the interface of the stainless steel microtube 7;

step S9: spreading molten drops of the copper nanowires 9, spreading the molten drops dropping to an interface of the stainless steel micro tube 7, and ensuring that the interface of the stainless steel micro tube 7 is smoothly transited and bonded well, wherein one end of the copper nanowires 9 is aligned to a joint of the stainless steel micro tube 7 and is 4 mm away from a flame core of a micro welding gun 8, and the melting point diameter of the melted copper nanowires 9 is 0.4 mm;

step S10: adjusting, namely rotating a hand wheel 12 to drive a stainless steel micro pipe 7 to rotate through a drill chuck 6, and adjusting the space position of the stainless steel micro pipe 7 until copper rice wire 9 molten drops are laid at the interface of the whole stainless steel micro pipe 7;

step S11: and (4) inspecting, namely inspecting water flowing into the welded stainless steel pipe, carefully inspecting the interface after water flowing, and ensuring that the interface is flat and smooth and is air-permeable and water-tight.

Through the embodiments 1-3, the welding process precisely controls the flame temperature through the micro welding gun 8, precisely controls the amount of the welding wire molten drops by using a specially-made micro welding wire, precisely judges the temperature and color of the base metal, precisely controls the spreading state of the welding wire molten drops, precisely controls the distance between the welding wire and the flame core, and can ensure that the stainless steel micro tube 7 welded by the special process has better connection quality, better tensile strength, plasticity and toughness, effectively reduces the connection cost and labor intensity, ensures the service life of the connection joint of the stainless steel micro tube 7, can ensure that the material is the micro tube connection quality with the stainless steel diameter less than 0.2 mm and the thickness less than 0.2 mm, has simpler operation and faster welding speed compared with the original process, and has better quality due to the welded stainless steel micro tube 7, therefore, the welded stainless steel micro-tube 7 can be prevented from being broken in the using process, the brittleness, the toughness and the hardness of the joint part are similar to those of the parent metal, the joint part is not easy to break and deform in the using process, the potential safety hazard and the potential quality hazard are reduced, the production cost and the material cost are saved, and the process and the corresponding welding equipment can be used for welding micro-tubes made of other materials.

The above is an embodiment of the present invention. The embodiments and specific parameters in the embodiments are only for the purpose of clearly illustrating the process of verifying the invention, and are not intended to limit the scope of the invention, which is defined by the claims.