Welding tool and welding method

Abstract

The invention discloses a welding tool which comprises a back protection gas tool and a water cooling tool, the back protection gas tool is used for introducing protection gas into the back face of a welding seam, the water cooling tool is used for transferring refrigerants, the back protection gas tool is matched with the water cooling tool and used for providing plating protection conditions for a welding workpiece, and the back protection gas tool comprises an upper bottom plate and a lower bottom plate; an outer circular ring is welded to the outer edges of the upper bottom plate and the lower bottom plate, and the upper bottom plate, the lower bottom plate and the outer circular ring form an annular cavity. According to the welding tool, the back protection gas tool and the water cooling tool are matched with each other, a copper plating layer, near a weld groove, of the barrel can be protected, the copper plating layer is prevented from being oxidized and damaged in the welding process, and accurate welding of a workpiece is achieved; the welding tool is matched with the welding method, accurate positioning and stable welding of the workpiece can be achieved, the welding quality and efficiency can be improved while a copper plating layer near a welding groove is protected, and the design quality use requirement is met.

Description

Technical Field

[0001] The invention relates to the technical field of water supply control, and in particular to a welding tool and a welding method. Background Art

[0002] Stainless steel welding is a process with high technical requirements and is widely used in many industries such as nuclear fusion, construction, food processing, chemical equipment, etc. In the field of welding, the workpiece welding structure design with copper plating on the stainless steel base is often used.

[0003] These designs make it very easy to damage the copper plating during welding, because the high temperature generated during welding causes the copper plating near the weld to burn and oxidize, and the damaged copper plating loses its usability. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned background technical problems and to provide a welding tool and a welding method.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A welding tool comprises: a back gas protection tool, which is used to introduce protective gas to the back of a weld, and a water cooling tool, which is used to transfer refrigerant. The back gas protection tool cooperates with the water cooling tool to provide coating protection conditions for the welding workpiece.

[0007] As a further solution of the present invention: the back air retaining tooling includes an upper base plate and a lower base plate, the outer edges of the upper base plate and the lower base plate are welded with an outer ring, and the upper base plate, the lower base plate and the outer ring form an annular cavity.

[0008] As a further solution of the present invention: a through hole is formed in the outer ring, a ventilation pipe is welded at the through hole, and the ventilation pipe is used to transport protective gas to the annular cavity.

[0009] As a further solution of the present invention: the water cooling tooling includes a hollow tube, the hollow tube is an open annular structure, and both ends of the hollow tube are closed.

[0010] As a further solution of the present invention: a flow channel is arranged in the hollow tube, an inlet pipe is welded at one end of the hollow tube, and a water outlet pipe is welded at the other end, and the inlet pipe and the outlet pipe are both connected to the flow channel to form a fluid passage.

[0011] As a further solution of the present invention: the back air retaining tooling and the water cooling tooling are both made of oxygen-free copper material.

[0012] A welding method, comprising:

[0013] S1. Clean and dry the cylinder to be welded and the welding tooling, align the welding groove of the cylinder, turn on the welding machine to spot weld and fix the cylinder;

[0014] S2, connect the back gas protection tooling with the protection gas source, and connect the water cooling tooling with the cooling water tank filled with refrigerant;

[0015] S3, assembling a back gas retaining tool on the outside of the cylinder, making the welding groove of the cylinder fit the annular cavity of the back gas retaining tool, and fixing the cylinder and the back gas retaining tool;

[0016] S4. Install the water cooling fixture inside the cylinder and adjust the distance between the water cooling fixture and the welding groove;

[0017] S5. Pre-flow the protective gas to the back gas protection tooling, and at the same time, flow the refrigerant into the water cooling tooling to cool the edge of the welding groove;

[0018] S6. Preset welding process parameters and welding sequence, weld from the inside of the cylinder, wait for the weld to cool down after welding, and remove the welding tooling.

[0019] As a further solution of the present invention: in step S2, the protective gas source adopts an argon gas source.

[0020] As a further solution of the present invention: in the step S4, the distance between the water cooling tooling and the welding groove is 5 mm to 10 mm.

[0021] As a further solution of the present invention: in the step S6, the welding process adopts TIG pulse welding, and the welding sequence adopts segmented symmetrical welding.

[0022] Beneficial effects of the present invention:

[0023] (1) In the present invention, the back gas protection tooling and the water cooling tooling of the welding tooling cooperate with each other to protect the copper plating layer of the cylinder near the weld groove, avoid oxidation and damage of the copper plating layer during welding, and achieve precise welding of the workpiece.

[0024] (2) In the present invention, the welding tooling matches the welding method, which can achieve accurate positioning and stable welding of the workpiece, while protecting the copper plating layer near the welding groove and improving the welding quality and efficiency, meeting the design quality requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figure 1 It is a structural schematic diagram of a back gas retaining tool in the welding tool of the present invention;

[0027] Figure 2It is a schematic structural diagram of a water cooling tool in the welding tool of the present invention;

[0028] Figure 3 yes Figure 2 Cross-sectional view of the water-cooling tooling;

[0029] Figure 4 It is a schematic diagram of the back gas retaining tooling being assembled on the outside of the cylinder during welding;

[0030] Figure 5 It is a schematic diagram of the water cooling tooling being assembled inside the cylinder during welding;

[0031] Figure 6 This is a schematic diagram of the welding sequence when welding the cylinder;

[0032] Figure 7 It is a schematic diagram of the weld groove;

[0033] Figure 8 It is a schematic diagram of the cross section of the cylinder weld groove;

[0034] Fig. 9 It is a schematic flow chart of the welding method of the present invention.

[0035] In the figure:

[0036] 1. Upper base plate; 2. Lower base plate; 3. Outer ring; 4. Ventilation pipe; 5. Hollow pipe; 6. Flow channel; 7. Water inlet pipe; 8. Water outlet pipe. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1-Figure 3 As shown, the present invention is a welding tool, including: a back gas protection tool and a water cooling tool, both of which are made of oxygen-free copper material. Oxygen-free copper (TU1) is high-purity copper with a copper content exceeding 99.9%. TU1 has good thermal conductivity, plasticity and toughness.

[0039] Among them, the back gas protection tooling is used to introduce protective gas into the back of the weld. The protective gas includes but is not limited to argon, nitrogen, helium, and a mixture of argon and nitrogen. Preferably, argon is used. The water cooling tooling is used to transfer the refrigerant. The refrigerant can be a cooling liquid or a cooling gas. Preferably, water is used as the refrigerant, which is less difficult to obtain and has low cost.

[0040] Specifically, the back gas protection tooling includes an upper base plate 1 and a lower base plate 2. An outer ring 3 is welded to the outer edges of the upper base plate 1 and the lower base plate 2. The outer ring 3 is a thin-walled cylindrical structure. The upper base plate 1, the lower base plate 2 and the outer ring 3 form an annular cavity. A through hole is provided in the outer ring 3, and a vent pipe 4 is welded at the through hole. The vent pipe 4 is used to transport protective gas to the annular cavity.

[0041] When welding the back gas protection tooling, the cleaned upper bottom plate 1, lower bottom plate 2 and outer ring 3 are assembled by TIG (argon arc welding) external spot welding, and then the cleaned ventilation pipe 4 is inserted into the through hole on the outer ring 3 and fixed by TIG external spot welding. The spot-welded ventilation pipe 4 is sealed by TIG from the inside of the outer ring 3, and correspondingly, the spot-welded upper bottom plate 1, lower bottom plate 2 and outer ring 3 are also required to be sealed by TIG, thereby completing the welding of the entire back gas protection tooling.

[0042] Furthermore, the water-cooling tooling includes a hollow tube 5, which is an open annular structure with both ends of the hollow tube 5 closed. A flow channel 6 is arranged in the hollow tube 5. An inlet pipe 7 is welded to one end of the hollow tube 5, and an outlet pipe 8 is welded to the other end. The inlet pipe 7 and the outlet pipe 8 are both connected to the flow channel 6 to form a fluid passage.

[0043] When welding the water-cooling tooling, take a hollow pipe with a square outside and a round inside and two copper tubes, bend the hollow pipe into a circle with a notch, and the outer diameter is slightly larger than the inner diameter of the cylinder to be welded (later used to assemble inside the cylinder to be welded). At the opening of the hollow pipe, a hole matching the outer diameter of the copper tube is opened at both ends 10 mm away from the port, and then the two copper tubes are inserted into the holes respectively, and flame brazing is used for sealing welding so that the two copper tubes are fixed on the hollow pipe. At this time, one copper tube is used as the water inlet pipe 7 and the other copper tube is used as the water outlet pipe 8. Finally, flame brazing is used to seal the openings at both ends of the hollow pipe to form a hollow tube 5, and the welding of the entire water-cooling tooling is completed.

[0044] In this embodiment, by using the back gas protection tooling and the water cooling tooling in combination, coating protection conditions can be provided for the welding workpiece.

[0045] See also Figure 4-Figure 5As shown, specifically, when welding the cylinder, the back gas protection tooling is sleeved on the outside of the cylinder so that the groove to be welded is located at the annular cavity of the back gas protection tooling, and then argon gas is transported to the annular cavity through the ventilation pipe 4 for pre-ventilation. Argon gas can protect the back of the weld from oxidation, which is convenient for forming a well-formed weld. The water-cooling tooling is stuck in the cylinder so that it is located near the weld groove. When welding the cylinder, water is introduced into the hollow tube 5 through the water inlet pipe 7, and the water flows out from the water outlet pipe 8 through the flow channel 6. During the flow of the hollow tube 5, the water quickly absorbs the heat transferred by the cylinder and takes the heat out, thereby reducing the width of the weld and welding deformation. The two cooperate with each other to protect the copper plating layer of the cylinder near the weld groove, avoid oxidation and damage of the copper plating layer during welding, and achieve precise welding of the workpiece.

[0046] See also Fig. 9 As shown, a welding method comprises:

[0047] S1. Clean and dry the cylinder to be welded and the welding tooling, align the welding groove of the cylinder, turn on the welding machine and fix the cylinder by spot welding.

[0048] The welding method is suitable for butt welding of a thin-walled stainless steel cylinder provided with a copper coating. In the present embodiment, the cylinder is a cylinder with a base wall thickness of 1 mm and a copper coating.

[0049] S2. Connect the back gas protection tooling with the protective gas source. The protective gas source adopts an argon source, which can be two bottles of 99.99% argon. Connect the input end of the argon pressure reducing gauge to the outlet of the argon gas bottle, and then connect the output end of the argon pressure reducing gauge to the ventilation pipe 4 of the back gas protection tooling.

[0050] The water-cooling tooling is connected to a cooling water tank filled with refrigerant, wherein the cooling water tank controls the output of water flow through a water pump, the water outlet of the cooling water tank is connected to the water inlet pipe 7 of the water-cooling tooling through a hose, and the water outlet pipe 8 is connected to the water inlet of the cooling water tank through a hose, at which time the water flow forms a circulation between the cooling water tank and the water-cooling tooling.

[0051] S3. Assemble the back gas retaining tooling on the outside of the cylinder, and sleeve the cylinder in the outer ring 3, so that the welding groove of the cylinder is matched with the annular cavity of the back gas retaining tooling, and use high-temperature tape to fix the cylinder and the back gas retaining tooling.

[0052] S4. Install the water cooling tool inside the cylinder. Since the TU1 material has good plasticity and toughness, the bending of the hollow tube 5 can be adjusted so that it can be inserted into the cylinder and fixed in the cylinder by its own elasticity. Adjust the distance between the hollow tube 5 and the welding groove. The distance between the hollow tube 5 and the welding groove is 5mm to 10mm. In this embodiment, the distance from the groove position is 8mm.

[0053] S5. Pre-flow the protective gas to the back and front gas protection tooling for 1 minute, and at the same time, turn on the switch of the cooling water tank, so that the water flows into the hollow tube 5 and then flows back to the water tank, so that the heat of the cylinder is transferred to the hollow tube 5 by heat transfer, and then the water flow takes away the heat, thereby realizing the cooling of the edge of the welding groove.

[0054] S6. Preset welding process parameters and welding sequence, and weld from the inside of the cylinder. The welding process adopts TIG pulse welding, which is a single-sided welding and double-sided forming process. By welding inside the cylinder, using the pulse welding technology, a good weld can be formed while welding, so as to obtain the corresponding welding effect outside the cylinder. The welding sequence adopts segmented symmetrical welding. After welding is completed, wait for the weld to cool and remove the welding tooling.

[0055] See also Figure 6-Figure 8 As shown, the welding groove is designed as an I-type butt groove, and the welding sequence adopts a segmented symmetrical welding sequence of abcdefgh. The welding process parameters are shown in the following table:

[0056]

[0057] After removing the welding tooling, the post-weld inspection is carried out, and the inspection data are shown in the following table:

[0058]

[0059] In this application, the back gas protection tool of the welding tool protects the back of the weld from oxidation to form a well-formed weld, while the water cooling tool is used to quickly remove the heat input during welding to reduce the width of the weld and welding deformation. During welding, the two tools cooperate with each other to protect the copper plating layer of the workpiece 5mm away from the groove from being damaged by oxidation to meet the design and use requirements. The welding tool matches the welding method to achieve precise positioning and stable welding of the workpiece. While protecting the copper plating layer near the welding groove, it can also improve the welding quality and efficiency to meet the design quality and use requirements.

[0060] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A welding tool, characterized in that: include: A back gas protection tool, which is used to introduce protective gas to the back of the weld; A water-cooling tool, wherein the water-cooling tool is used to transfer a refrigerant; The back gas protection tooling cooperates with the water cooling tooling to provide coating protection conditions for the welding workpiece.

2. A welding tool according to claim 1, characterized in that: The back air retaining tooling comprises an upper base plate (1) and a lower base plate (2), the outer edges of the upper base plate (1) and the lower base plate (2) are welded with an outer ring (3), and the upper base plate (1), the lower base plate (2) and the outer ring (3) form an annular cavity.

3. A welding tool according to claim 2, characterized in that: The outer circular ring (3) is provided with a through hole, a vent pipe (4) is welded at the through hole, and the vent pipe (4) is used to transport protective gas to the annular cavity.

4. A welding tool according to claim 1, characterized in that: The water cooling tooling comprises a hollow tube (5), the hollow tube (5) is an open annular structure, and both ends of the hollow tube (5) are closed.

5. A welding tool according to claim 4, characterized in that: A flow channel (6) is arranged in the hollow tube (5); a water inlet pipe (7) is welded to one end of the hollow tube (5), and a water outlet pipe (8) is welded to the other end; the water inlet pipe (7) and the water outlet pipe (8) are both connected to the flow channel (6) to form a fluid passage.

6. A welding tool according to claim 1, characterized in that: The back air protection tooling and the water cooling tooling are both made of oxygen-free copper material.

7. A welding method, characterized in that: include: S1. Clean and dry the cylinder to be welded, align the welding groove of the cylinder, turn on the welding machine and perform spot welding to fix the cylinder; S2, connect the back gas protection tooling with the protection gas source, and connect the water cooling tooling with the cooling water tank filled with refrigerant; S3, assembling a back gas retaining tool on the outside of the cylinder, making the welding groove of the cylinder fit the annular cavity of the back gas retaining tool, and fixing the cylinder and the back gas retaining tool; S4. Install the water cooling fixture inside the cylinder and adjust the distance between the water cooling fixture and the welding groove; S5. Pre-flow the protective gas to the back gas protection tooling, and at the same time, flow the refrigerant into the water cooling tooling to cool the edge of the welding groove; S6. Preset welding process parameters and welding sequence, weld from the inside of the cylinder, wait for the weld to cool down after welding, and remove the welding tooling.

8. A welding method according to claim 7, characterized in that: In step S2, the protective gas source is an argon gas source.

9. A welding method according to claim 7, characterized in that: In the step S4, the distance between the water cooling fixture and the welding groove is 5 mm to 10 mm.

10. A welding method according to claim 7, characterized in that: In step S6, the welding process adopts TIG pulse welding, and the welding sequence adopts segmented symmetrical welding.

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