Balance oil cylinder welding equipment and welding process thereof

Abstract

The invention relates to the technical field of welding devices, and particularly discloses balance oil cylinder welding equipment and a welding process thereof.The balance oil cylinder welding equipment comprises a power system, a welding gun, a wire feeding system, a gas protection system and a cooling system.The welding gun comprises a gun body, a diverter, a conductive sleeve and a nozzle, the conductive sleeve comprises a pipe body, and a through hole penetrating front and back is formed in the pipe body; a threaded section connected with the flow divider is arranged at the tail end of the pipe body, and a plurality of mounting grooves communicated with the through hole are formed in the circumferential surface of the pipe body; the conductive blocks are matched with the mounting grooves in shape, so that the conductive blocks can slide in the radial direction of the pipe body and make contact with the welding wires, the outer sides of the conductive blocks protrude out of the pipe body, pressure is continuously applied through the fastening wires, tight contact between the conductive blocks and the welding wires is kept, poor contact of the welding wires in the abrasion process is avoided, and the service life of the welding wires is prolonged. Therefore, the stability and the quality of the welding process are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of welding devices, and in particular to a balancing oil cylinder welding device and a welding process thereof. Background Art

[0002] As a high-efficiency welding process, carbon dioxide gas shielded welding (CO2 gas shielded welding for short) has significant advantages in the welding of low-carbon steel and low-alloy high-strength steel, such as high welding productivity, excellent crack resistance and strong deformation control ability.

[0003] A Chinese patent document with authorization announcement number CN113510346B discloses a welding gun and a welding method, which relate to the field of welding technology. The welding gun comprises: a wire guide tube, through which the welding wire of the welding gun passes, and the welding wire is located inside the wire guide tube; a conductive nozzle, which is connected to the wire guide tube; a shielding gas nozzle, through which shielding gas is ejected; an insulator, which is provided with a through hole, and one end of the insulator cooperates with the shielding gas nozzle; a shielding gas conduit, which is provided with an opening, which is located inside the wire guide tube, and the shielding gas conduit is connected to the wire guide tube; a connector, which passes through the through hole of the insulator, is located inside the shielding gas nozzle, and is connected to the shielding gas conduit.

[0004] In carbon dioxide gas shielded welding (CO2 gas shielded welding), the conductive sleeve is one of the key components of the welding gun. The wear problem does exist and directly affects the welding stability and equipment life. The welding wire passes through the inner cavity of the conductive sleeve at a constant speed, and continuous friction causes wear of the inner wall. Especially when the welding wire is poorly straightened or the material does not match, the wear rate increases significantly. After wear, the contact area between the conductive sleeve and the welding wire decreases, and the resistance increases, resulting in unstable current, causing arc drift, increased spatter and other problems. Summary of the invention

[0005] The invention provides a balanced oil cylinder welding device, aiming to solve the problem in the related art that the contact area between the conductive sleeve and the welding wire is reduced after the conductive sleeve is worn.

[0006] A balanced oil cylinder welding device comprises a power supply system, a welding gun, a wire feeding system, a gas protection system and a cooling system. The welding gun comprises a gun body, a flow divider, a conductive sleeve and a nozzle. The conductive sleeve comprises: A tube body, wherein a through hole is provided in the tube body, a threaded section connected to the flow divider is provided at the end of the tube body, and a plurality of mounting grooves connected to the through hole are provided on the circumferential surface; A plurality of conductive blocks, the conductive blocks are adapted to the shape of the mounting grooves, so that the conductive blocks can slide along the radial direction of the tube body, thereby contacting the welding wire, and the outer side of the conductive blocks protrudes out of the tube body; The energy storage ring is sleeved on the diverter and is rotatably connected to the diverter, and an elastic member is connected between the two; The clutch structure is arranged on the pipe body near the threaded section and is used to make the energy storage ring rotate along with the pipe body; The docking ring and the connecting ring are connected by multiple fastening wires between them. A clamping structure for clamping the two is arranged between the docking ring and the front end of the pipe body. The connecting ring is coaxially and slidably installed on the energy storage ring; During the process of clamping the docking ring and the front end of the pipe body, the connecting ring pushes against the clutch structure to separate the energy storage ring from the pipe body.

[0007] Its effect is as follows: The combined use of the clutch structure and the energy storage ring. During the process of screwing the pipe body to install the conductive sleeve on the diverter, the clutch structure is in the engaged state and is used to make the energy storage ring rotate together with the pipe body, so that the pipe body can store energy for the energy storage ring when rotating. After the installation is completed, the clutch structure switches to the separated state, and the energy storage ring can rotate relative to the pipe body. The energy storage ring releases elastic potential energy, making the connecting ring rotate relative to the docking ring, so that the fastening wires are wound around the pipe body. As the connecting ring rotates, the fastening wires are tightened, and then the fastening wires squeeze the conductive block, ensuring a stable contact area between the conductive block and the welding wire, avoiding poor contact. When there is wear between the conductive block and the welding wire, due to the continuous torque applied by the energy storage ring to the connecting ring, the fastening wires are continuously tightened, so that pressure is always applied to the conductive block. Therefore, wear can be compensated in time during use, and the service life of the conductive sleeve can be extended.

[0008] Preferably, a chute penetrating its front end face is provided on the outer circumferential surface of the energy storage ring, and a convex block adapted to the chute is provided on the inner ring of the connecting ring.

[0009] Preferably, the clutch structure includes a clutch ring. The clutch ring is sleeved on the end of the pipe body near the threaded section and is slidably connected to the pipe body. Matching convex strips are provided on the mutually approaching surfaces of the clutch ring and the energy storage ring. An elastic piece capable of abutting against the clutch ring is provided at the rear end of the conductive block, and the outer diameter of the clutch ring is larger than the inner diameter of the connecting ring.

[0010] Preferably, in the front view projection plane, the convex strip on the clutch ring is within the range of the inner ring of the connecting ring.

[0011] Preferably, the clamping structure includes an abutting block provided at the front end of the conductive block, and a limiting block capable of abutting against the abutting block and the conductive block is provided in the inner ring of the docking ring. When the limiting block abuts against the abutting block, the rear end of the limiting block abuts against the front end face of the conductive block.

[0012] Preferably, the conductive block is composed of two conductive strips, and an elastic conductive sheet for making the conductive strips closely adhere to the inner wall of the installation groove is provided between the two conductive strips.

[0013] Preferably, the connecting ring is conductively connected to the diverter through a force storage ring, and the fastening wire is made of conductive material. When the docking ring is clamped with the front end of the tube body, the fastening wire is wrapped around the conductive block and applies pressure to the conductive block in the direction of the axis of the tube body.

[0014] Preferably, the outer side surface of the conductive strip is an arc-shaped surface.

[0015] A welding process for a balancing oil cylinder comprises the following steps: S1. The cylinder bottom and the cylinder body are coaxially installed together, and a gap that needs to be welded is formed between the two; S2. Use the above welding equipment to perform welding, the welding current is: 130-150A, the welding voltage is: 19-22V; S3. After welding, remove the slag and weld nodules; S4. After welding, color penetration inspection and low-temperature tempering heat treatment are carried out. The tempering temperature is 250℃ and the insulation treatment is carried out for 1-2 hours.

[0016] By adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. During the screwing process, the clutch structure causes the power storage ring to rotate together with the pipe body, thereby storing power in the power storage ring. When it is fully screwed in, the docking ring is pulled forward, and the docking ring is pulled forward by the fastening wire, and finally the docking ring and the front end of the pipe body are engaged. During this process, the clutch structure switches to a separation state, and the power storage ring releases the power, driving the connecting ring to rotate relative to the pipe body. The fastening wire is wound around the pipe fitting, thereby squeezing the conductive block inward. The fastening wire continuously applies pressure to maintain close contact between the conductive block and the welding wire, avoiding poor contact of the welding wire during wear, thereby ensuring the stability and quality of the welding process; 2. Using materials with high conductivity to manufacture fastening wires and conductive blocks can ensure excellent conductive effects in electrical connections. Through the combination of the power storage ring, the connecting ring and the fastening wire, the current can be effectively transmitted and distributed to the conductive block. This design not only optimizes the current flow path, but also further enhances the overall conductive performance by reducing contact resistance and improving connection stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the welding gun in the present invention.

[0018] Figure 2 It is a schematic diagram of the structure of the welding gun without the nozzle in the present invention.

[0019] Figure 3 It is a schematic structural diagram of the clutch structure in the present invention.

[0020] Figure 4It is a schematic diagram of the explosion structure of the welding gun in the present invention.

[0021] Figure 5 It is a schematic diagram of the structure of the conductive block in the present invention.

[0022] Reference numerals: 1. Gun body; 2. Diverter; 3. Conductive sleeve; 31. Tube body; 32. Conductive block; 321. Abutment block; 322. Conductive strip; 323. Elastic conductive sheet; 33. Power storage ring; 331. Slide groove; 34. Clutch structure; 341. Clutch ring; 342. Elastic sheet; 35. Docking ring; 351. Limit block; 36. Connecting ring; 361. Bump; 37. Fastening wire; 4. Nozzle. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0024] A balanced oil cylinder welding device includes a power supply system, a welding gun, a wire feeding system, a gas protection system and a cooling system. During welding, the current is controlled at 130-150A and the voltage is 19-22V to ensure welding stability. The wire feeding system accurately controls the welding wire speed to ensure the welding effect. The gas protection system provides a stable carbon dioxide gas flow to prevent oxidation of the welding area. The cooling system effectively reduces the temperature of the welding gun.

[0025] like Figures 1 - 5 As shown, the welding gun consists of a gun body 1, a diverter 2, a conductive sleeve 3 and a nozzle 4. The diverter 2 is located at the front end of the gun body 1, and is provided with an internal thread and an external thread. An air blowing port connected to the gas protection system is provided on the outer circumferential surface of the diverter 2 located in front of the external thread. The diverter 2 is electrically connected to the power supply system, the conductive sleeve 3 is connected to the internal thread of the diverter 2, the nozzle 4 is threadedly connected to the external thread of the diverter 2, and an insulating layer is provided at the connection between the two, thereby forming a short circuit. The conductive sleeve 3 is located on the axial position of the nozzle 4, and there is a large gap between the conductive sleeve 3 and the nozzle 4, and the welding wire passes through the conductive sleeve 3.

[0026] The conductive sleeve 3 includes a tube body 31, a conductive block 32, a power storage ring 33, a clutch structure 34, a docking ring 35, a connecting ring 36, and fastening wires 37. A through hole that penetrates through the front and back is provided in the tube body 31, and four mounting grooves communicating with the through hole are provided on the circumferential surface. The end of the tube body 31 is provided with a threaded section that meshes with the internal thread in the shunt 2. The conductive block 32 is adapted to the shape of the mounting groove and slides radially along the tube body 31. The power storage ring 33 is sleeved on the shunt 2, and a chute 331 penetrating through its front end face is provided on the outer circumferential surface of the power storage ring 33. A convex block 361 adapted to the chute 331 is provided on the inner ring of the connecting ring 36, so that the connecting ring 36 is coaxially and slidably mounted on the power storage ring 33. The clutch structure 34 is provided at a position on the tube body 31 close to the threaded section. When the clutch structure 34 is in the engaged state, it is used to make the power storage ring 33 and the tube body 31 rotate together. When the clutch structure 34 is in the separated state, the power storage ring 33 can rotate relative to the tube body 31. A plurality of fastening wires 37 are connected between the docking ring 35 and the connecting ring 36 (for the convenience of understanding, four are shown in the figure, and actually eight or more are provided); A clamping structure for clamping the docking ring 35 and the front end of the tube body 31 is provided between the docking ring 35 and the front end of the tube body 31. When installing the conductive sleeve 3, the threaded section of the tube body 31 passes through the docking ring 35 and the connecting ring 36, and then is screwed onto the internal thread of the shunt 2. During the screwing process, the clutch structure 34 makes the power storage ring 33 and the tube body 31 rotate together, so as to store energy for the power storage ring 33. When it is completely screwed in, the docking ring 35 is pulled forward, and the docking ring 35 is pulled forward by the fastening wires 37, and finally the docking ring 35 and the front end of the tube body 31 are clamped. During this process, the clutch structure 34 switches to the separated state, and the power storage ring 33 releases the stored energy, driving the connecting ring 36 to rotate relative to the tube body 31, and the fastening wires 37 are wound around the pipe fitting, so as to inwardly squeeze the conductive block 32 to ensure continuous contact between the conductive block 32 and the welding wire and maintain the stability and conductivity of the welding torch.

[0027] In order to further improve the conductivity, the connecting ring 36 is electrically connected to the shunt 2 through the power storage ring 33, and the fastening wires 37 are made of conductive materials, so as to be electrically connected to the conductive block 32 through the fastening wires 37 to ensure smooth transmission of current to the conductive block 32.

[0028] A chute 331 penetrating through its front end face is provided on the outer circumferential surface of the power storage ring 33. A convex block 361 adapted to the chute 331 is provided on the inner ring of the connecting ring 36. An elastic member (preferably a torsion spring) is connected between the inner ring of the power storage ring 33 and the shunt 2, so as to store elastic potential energy when the power storage ring 33 rotates; During the installation of the conductive sleeve 3, the clutch structure 34 enables the energy storage ring 33 to rotate synchronously and store energy when the pipe body 31 is screwed. After the pipe body 31 is fully screwed into the diverter 2, the docking ring 35 is pulled to switch the clutch structure 34 to the separated state. At this time, the energy storage ring 33 releases the elastic potential energy it has stored, driving the connecting ring 36 to rotate relative to the pipe body 31. This rotational movement causes the fastening wire 37 to wind around the pipe body 31 and gradually tighten, thereby applying a continuous pressure to the conductive block 32, that is, automatic compensation is achieved, ensuring that even if there is wear between the conductive block 32 and the welding wire, the fastening wire 37 can be tightened in time to compensate for the wear, thus extending the service life of the conductive sleeve 3.

[0029] The clutch structure 34 includes a clutch ring 341 and an elastic sheet 342. The inner hole of the clutch ring 341 is octagonal, and an octagonal block adapted to the inner hole of the clutch ring 341 is provided at a position near the threaded section at the end of the pipe body 31, so that the clutch ring 341 is slidably mounted on the pipe body 31. The elastic sheet 342 is fixedly connected to the rear end of the conductive block 32 and can abut against the clutch ring 341. On the mutually approaching surfaces of the clutch ring 341 and the energy storage ring 33, mating ridges are provided. When the clutch ring 341 contacts the energy storage ring 33, the ridges are mutually engaged to ensure that the clutch ring 341 and the energy storage ring 33 can rotate together, so that the clutch ring 341 drives the energy storage ring 33 to rotate synchronously. The outer diameter of the clutch ring 341 is larger than the inner diameter of the connecting ring 36, and in the front view projection plane, the ridge on the clutch ring 341 is within the inner ring range of the connecting ring 36. When the docking ring 35 is pulled forward and the docking ring 35 is pulled forward by the fastening wire 37, the docking ring 35 abuts against the clutch ring 341, causing the elastic sheet 342 to deform, separating the clutch ring 341 from the energy storage ring 33, and further enabling the energy storage ring 33 to release the elastic potential energy, driving the connecting ring 36 to rotate relative to the clutch ring 341.

[0030] The clamping structure includes an abutting block 321 and a limiting block 351. The abutting block 321 is located at the front end of the conductive block 32, and the limiting block 351 is fixedly connected to the inner ring of the docking ring 35. When the docking ring 35 moves forward, the limiting block 351 is restricted between the two conductive blocks 32. When the limiting block 351 moves to the position of the abutting block 321, due to the torque applied by the docking ring 35, the side surface of the limiting block 351 is in close contact with the abutting block 321, and the rear side surface of the limiting block 351 is in close contact with the front end surface of the conductive block 32, ensuring stable clamping of the docking ring 35 and the front end of the pipe body 31, preventing the docking ring 35 from rotating together with the connecting ring 36, thereby applying a tension force to the fastening wire 37, causing the fastening wire 37 to generate a continuous pressure on the conductive block 32, ensuring close contact between the conductive block 32 and the welding wire, and maintaining a stable conductive connection with the welding wire.

[0031] Such as Figure 4 And Figure 5As shown, the conductive block 32 is composed of an elastic conductive sheet 323 (preferably made of a copper-based alloy or a titanium alloy) and two conductive bars 322 (preferably made of chromium zirconium copper). The two conductive bars 322 are fitted with each other and can change the distance between them. The elastic conductive sheet 323 is arranged between the two conductive bars 322 to make the conductive bars 322 closely adhere to the inner wall of the installation groove, so that the conductive bars 322 are stably conductively connected to the pipe fitting. In order to ensure stable contact between the fastening wire 37 and the conductive bar 322, the outer side of the conductive bar 322 is an arc surface.

[0032] The installation and replacement process of the conductive sleeve 3 is as follows: Step 1: Put the connecting ring 36 on the energy storage ring 33. Step 2: The pipe fitting passes through the docking ring 35 and is docked with the internal thread of the diverter 2. Then, keep the front end of the gun body 1 tilted downward and screw the pipe fitting to make the threaded section of the pipe fitting enter the internal thread of the diverter 2. Step 3: During the screwing process, the elastic piece 342 pushes the clutch ring 341 close to the energy storage ring 33. When the convex strip on the clutch ring 341 is engaged with the convex strip of the energy storage ring 33, the clutch ring 341 drives the energy storage ring 33 to rotate synchronously and stores elastic potential energy. Step 4: Continue to screw until the pipe fitting is completely fixed. Step 5: Pull the docking ring 35 forward to make the connecting ring 36 abut against the clutch ring 341. The elastic piece 342 deforms, the clutch ring 341 is disengaged from the energy storage ring 33, and the elastic potential energy is released to drive the connecting ring 36 to rotate. Step 6: The limiting block 351 closely abuts against the abutting block 321 to ensure stable clamping of the docking ring 35 and the front end of the pipe body 31 to prevent rotation. At the same time, the fastening wire 37 continuously presses on the conductive block 32 to maintain stable conductive connection with the welding wire. Step 7: When replacing, rotate the docking ring 35 in the reverse direction to make the docking ring 35 disengage from the conductive block 32. Step 8: Since the conductive block 32 is always in close sliding friction with the welding wire during the welding process, the replacement frequency of the pipe body 31 is relatively low. When only the conductive block 32 needs to be replaced, remove the conductive block 32 and install a new conductive block 32. If the pipe body 31 is severely worn, the entire pipe body 31 needs to be replaced and a new conductive block 32 needs to be reinstalled to ensure the conductive performance and welding stability.

[0033] A welding process for a balance oil cylinder includes the following steps: S1: The cylinder bottom and the cylinder body are coaxially installed together, and a gap to be welded is formed between them. S2: Align the welding torch with the gap, then start the power system. The welding wire is conveyed from inside the conductive sleeve 3 to the outside. At the same time, the outer end of the welding wire contacts the gap, and the welding torch is smoothly moved along the gap to weld the gap. The welding current is: 130 - 150A, and the welding voltage is: 19 - 22V. S3. Remove the slag and welding beads after welding is completed; S4. Conduct dye penetrant inspection and low-temperature tempering heat treatment after welding. The tempering temperature is 250 °C, and the heat preservation treatment is 1 - 2 hours.

[0034] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0036] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as a limitation of the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A balanced cylinder welding device, comprising a power supply system, a welding gun, a wire feeding system, a gas protection system and a cooling system, wherein the welding gun comprises a gun body (1), a flow divider (2), a conductive sleeve (3) and a nozzle (4), characterized in that: The conductive sleeve (3) comprises: A tube body (31), wherein a through hole is provided in the tube body (31) and passes through the tube body from front to back, a threaded section connected to the flow divider (2) is provided at the end of the tube body (31), and a plurality of mounting grooves connected to the through hole are provided on the circumferential surface; A plurality of conductive blocks (32), wherein the conductive blocks (32) are adapted to the shape of the mounting grooves, so that the conductive blocks (32) can slide along the radial direction of the tube body (31) and thus come into contact with the welding wire, and the outer sides of the conductive blocks (32) protrude from the tube body (31); A force storage ring (33) is sleeved on the diverter (2) and is rotatably connected to the diverter (2), with an elastic member connected therebetween; A clutch structure (34) is arranged on the tube body (31) at a position close to the threaded section and is used to allow the force storage ring (33) to rotate along with the tube body (31); A docking ring (35) and a connecting ring (36), a plurality of fastening wires (37) being connected therebetween, a clamping structure for clamping the docking ring (35) and the front end of the tube body (31) being provided between the docking ring (35) and the front end of the tube body (31), and the connecting ring (36) being coaxially slidably mounted on the power storage ring (33); During the process of clamping the butt joint ring (35) and the front end of the tube body (31), the connection ring (36) pushes the clutch structure (34) to separate the force storage ring (33) from the tube body (31).

2. The balancing oil cylinder welding equipment according to claim 1 is characterized in that: The outer circumferential surface of the force storage ring (33) is provided with a slide groove (331) penetrating the front end surface thereof, and the inner ring of the connecting ring (36) is provided with a protrusion (361) adapted to the slide groove (331).

3. The balancing oil cylinder welding equipment according to claim 1, characterized in that: The clutch structure (34) comprises a clutch ring (341), the clutch ring (341) being sleeved on the end of the tube body (31) near the threaded section, and the clutch ring (341) being slidably connected to the tube body (31), the clutch ring (341) and the power storage ring (33) being provided with matching convex strips on their mutually adjacent surfaces, the rear end of the conductive block (32) being provided with an elastic sheet (342) capable of abutting against the clutch ring (341), and the outer diameter of the clutch ring (341) being greater than the inner diameter of the connecting ring (36).

4. The balancing oil cylinder welding equipment according to claim 3 is characterized in that: On the front projection surface, the convex strip on the clutch ring (341) is located within the inner ring range of the connecting ring (36).

5. The balancing oil cylinder welding equipment according to claim 4 is characterized in that: The clamping structure comprises an abutment block (321) arranged at the front end of the conductive block (32); a limit block (351) capable of abutting against the abutment block (321) and the conductive block (32) is arranged in the inner ring of the docking ring (35); when the limit block (351) abuts against the abutment block (321), the rear end of the limit block (351) abuts against the front end surface of the conductive block (32).

6. The balancing oil cylinder welding equipment according to claim 5, characterized in that: The conductive block (32) is composed of two conductive strips (322), and an elastic conductive sheet (323) is provided between the two conductive strips (322) for making the conductive strip (322) closely adhere to the inner wall of the installation groove.

7. The balancing oil cylinder welding equipment according to claim 6, characterized in that: The connecting ring (36) is conductively connected to the diverter (2) via the power storage ring (33); the fastening wire (37) is made of a conductive material; when the docking ring (35) is engaged with the front end of the tube body (31), the fastening wire (37) is wound around the conductive block (32) and applies pressure to the conductive block (32) in a direction toward the axis of the tube body (31).

8. The balancing oil cylinder welding equipment according to claim 7, characterized in that: The outer side surface of the conductive strip (322) is an arc-shaped surface.

9. The welding process of the balancing oil cylinder according to claim 7 is characterized in that: The following steps are involved: S1. The cylinder bottom and the cylinder body are coaxially installed together, and a gap that needs to be welded is formed between the two; S2. Use the welding equipment described in any one of claims 1 to 8 for welding, the welding current is: 130-150A, the welding voltage is: 19-22V; S3. After welding, remove the slag and weld nodules; S4. After welding, color penetration inspection and low-temperature tempering heat treatment are carried out. The tempering temperature is 250℃ and the insulation treatment is carried out for 1-2 hours.

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