Square tube machining laser welding tool and welding method capable of assisting in pressing

Abstract

The invention relates to the technical field of square tube production, and discloses an auxiliary pressing laser welding tool for square tube machining and a welding method.The auxiliary pressing laser welding tool comprises a machining table, a conveying assembly is arranged at the top of the machining table, a welding assembly and a mounting frame are arranged on the upper side of the conveying assembly, and a supporting assembly and a sheet type connecting assembly are arranged in the mounting frame; clamping assemblies are arranged on the two sides of the supporting assembly, and an extrusion assembly is arranged at the top of the supporting assembly. Through the sheet type connecting assembly and the gap in the top of the square tube, the supporting assembly can move into the square tube, meanwhile, the multiple supporting ends can make contact with the inner wall of the square tube, when the welding assembly is used for welding the gap of the square tube, the clamping assembly and the extrusion assembly can make contact with the outer surface of the square tube, and the welding efficiency is improved. By means of the arrangement, the phenomenon of pipe body deformation caused by welding thermal stress is effectively restrained, and therefore the appearance quality, the bearing capacity and the production cycle of the square pipe are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of square tube manufacturing technology, specifically to a laser welding fixture and welding method for assisting in the pressing of square tubes. Background Technology

[0002] In the continuous production of square tubes, after the strip steel is roll-formed into a square tube shape, a continuous gap extending along the length direction will be formed on one side of the square tube. In order to ensure the overall load-bearing capacity of the square tube, the gap needs to be welded.

[0003] After the steel strip is rolled into a square tube, the lack of internal support makes it prone to deformation of the tube body on both sides of the gap under thermal stress when the gap is welded by laser welding. This deformation not only affects the appearance and dimensional accuracy of the square tube, but may also lead to defects such as weld cracks and incomplete penetration, reducing the load-bearing capacity and service life of the square tube. At the same time, the company needs to add an extra straightening process, thereby extending the production cycle of the square tube.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a laser welding fixture and welding method for auxiliary clamping of square tubes, which has advantages such as supporting the inside of the square tube and solving the problem of tube deformation under thermal stress on both sides of the gap.

[0006] (II) Technical Solution To address the technical problem that the tube body on both sides of the gap in the aforementioned laser welding fixture and welding method for auxiliary clamping of square tubes is easily deformed under thermal stress, the present invention provides the following technical solution: A laser welding fixture for assisting in the clamping of square tubes includes a processing table, characterized in that: a transport component is provided on the top of the processing table, a welding component and a mounting frame are provided on the upper side of the transport component, a support component and a plate-type connecting component are provided inside the mounting frame, the plate-type connecting component is connected to the support component, clamping components are provided on both sides of the support component, and a pressing component is provided on the top of the support component, and both the clamping component and the pressing component are poweredly connected to the mounting frame; The transport assembly is used to transport the square tube so that it passes through the gap from the sheet-connecting assembly. At the same time, the support assembly contacts the inner wall of the square tube. The clamping assembly and the extrusion assembly are used to guide and limit the outer side of the square tube so that the gap remains flat when the square tube is welded.

[0007] Preferably, the transport assembly includes a transport frame, which is fixedly installed on the top of the processing table. A plurality of transport rollers are rotatably connected inside the transport frame. The shaft ends of the plurality of transport rollers pass through the transport frame and are fixedly connected to sprockets. A chain is engaged on the outer surface of the sprockets. A transport motor is fixedly installed on the top of the processing table, and the output end of the transport motor is fixedly connected to the shaft ends of the transport rollers.

[0008] Preferably, the welding assembly includes a support column, which is fixedly installed on the top of the processing table. A lifting platform is provided on the outer surface of the support column, and a laser welding head is fixedly installed on one side of the lifting platform.

[0009] Preferably, the support assembly includes a support box disposed inside the mounting frame. The support box has several movable slots on all four sides. Movable rods are movably connected inside the movable slots. Movable frames are fixedly connected to the top of the movable rods. Several support rollers are rotatably connected inside the movable frames.

[0010] Preferably, an expansion screw is rotatably connected inside the support box, a connecting seat is threadedly connected to the outer surface of the expansion screw, and a plurality of rotating rods are rotatably connected to the outer surface of the connecting seat, with one end of each of the rotating rods rotatably connected to a corresponding moving rod.

[0011] Preferably, the plate-type connecting assembly includes an adjusting plate disposed inside the mounting frame. An L-shaped connecting plate is fixedly connected to the bottom of the adjusting plate. One side of the L-shaped connecting plate is fixedly mounted on the support box. Rollers are rotatably connected to both the front and back of the L-shaped connecting plate. An adjusting screw is threadedly connected to the top of the mounting frame. The bottom end of the adjusting screw passes through the mounting frame and is rotatably connected to the adjusting plate. Several guide rods are fixedly connected inside the mounting frame, and the adjusting plate is movably connected to the corresponding guide rod.

[0012] Preferably, the clamping assembly includes a connecting plate disposed inside the mounting frame. A clamping screw is threadedly connected to the front side of the connecting plate. One end of the clamping screw passes through the connecting plate and is rotatably connected to a clamping frame. A plurality of clamping rollers are rotatably connected inside the clamping frame. A clamping limiting rod is fixedly connected to the back side of the clamping frame. The clamping limiting rod is movably connected to the connecting plate. Guide tubes are fixedly connected to both sides of the connecting plate. The guide tubes are movably connected to corresponding guide rods. One side of the guide tube is fixedly connected to an adjusting plate.

[0013] Preferably, the extrusion assembly includes extrusion frames, two of which are symmetrically arranged inside the mounting frame. Several extrusion rollers are rotatably connected inside the extrusion frames. Mounting plates are fixedly installed on the top of the two extrusion frames. Extrusion screws are rotatably connected to the top of the mounting plates. The extrusion screws are threadedly connected to the mounting frame. An extrusion limiting rod is movably connected to the top of the mounting frame. The extrusion limiting rod passes through the mounting frame and is fixedly connected to the mounting plate.

[0014] A welding method using a laser welding fixture for square tube processing with auxiliary clamping as described above.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a laser welding fixture and welding method for auxiliary clamping of square tubes, which has the following beneficial effects: 1. This invention allows the square tube to be transported to the plate-type connecting assembly via a transport component. The plate-type connecting assembly supports the supporting component through the gap at the top of the square tube, enabling the plate-type connecting assembly to move continuously from the plate-type connecting assembly. Simultaneously, several supporting ends of the supporting assembly can contact the inner wall of the square tube. In addition, when the welding assembly welds the gap of the square tube, the clamping and extrusion components can contact the outer surface of the square tube. At this time, under the combined action of external clamping and internal support, the deformation of the tube body caused by welding thermal stress is effectively suppressed, thereby ensuring the appearance quality, load-bearing capacity, and production cycle of the square tube.

[0016] 2. This invention drives the connecting seat by expanding the screw, thereby causing the rotating rod to expand under the constraints of the connecting seat, the moving rod, and the moving groove. At the same time, the expanding rotating rod can push the moving frame through the moving rod. In the above setting, only the expansion screw needs to be rotated to make the four moving frames move synchronously. This device can support square tubes of different specifications according to different requirements, and it is also convenient to adjust. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external contour structure of the present invention; Figure 2 For the present invention Figure 1 Rear view structural diagram; Figure 3 This is a schematic diagram of the transportation component structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the support frame of the present invention; Figure 5 This is a schematic diagram of the clamping component structure of the present invention; Figure 6 This is a cross-sectional view of the support box structure of the present invention; Figure 7 This is a schematic diagram of the movable frame structure of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram at point A in the middle; Figure 9 This is a schematic diagram of the extrusion assembly structure of the present invention.

[0018] In the diagram: 1. Processing table; 2. Transport assembly; 201. Transport frame; 202. Transport roller; 203. Sprocket; 204. Chain; 205. Transport motor; 3. Welding assembly; 301. Support column; 302. Lifting platform; 303. Laser welding head; 4. Mounting frame; 5. Support assembly; 501. Support box; 502. Moving groove; 503. Moving rod; 504. Moving frame; 505. Support roller; 506. Expansion screw; 507. Connecting seat; 508. 6. Rotating rod; 7. Plate-type connecting assembly; 8. Adjusting plate; 9. L-shaped connecting plate; 10. Rotating roller; 11. Adjusting screw; 12. Guide rod; 13. Clamping assembly; 14. Connecting plate; 15. Clamping screw; 16. Clamping frame; 17. Clamping roller; 18. Clamping limit rod; 19. Guide tube; 20. Extrusion assembly; 10. Extrusion frame; 11. Extrusion roller; 12. Mounting plate; 13. Extrusion screw; 14. Extrusion limit rod. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a laser welding fixture and welding method for auxiliary clamping of square tubes.

[0021] Please see Figure 1-9 A laser welding fixture for assisting in the clamping of square tubes includes a processing table 1. A transport component 2 is provided on the top of the processing table 1. A welding component 3 and a mounting frame 4 are provided on the upper side of the transport component 2. A support component 5 and a plate-type connecting component 6 are provided inside the mounting frame 4. The plate-type connecting component 6 is connected to the support component 5. Clamping components 7 are provided on both sides of the support component 5. A pressing component 8 is provided on the top of the support component 5. Both the clamping component 7 and the pressing component 8 are poweredly connected to the mounting frame 4. The transport component 2 is used to transport the square tube so that it passes through the gap from the sheet-type connecting component 6. At the same time, the support component 5 contacts the inner wall of the square tube. The clamping component 7 and the extrusion component 8 are used to guide and limit the outer side of the square tube so that the gap remains flat when the square tube is welded.

[0022] By placing the rolled square tube on the transport component 2, the gap at the top of the square tube passes through the sheet-connecting component 6 under the transport of the transport component 2. At the same time, the support component 5 moves into the inside of the square tube under the support of the sheet-connecting component 6. After the square tube moves to the predetermined position, the clamping component 7, the extrusion component 8 and the support component 5 cooperate to clamp the body of the square tube. Then the welding component 3 begins to weld the gap at the top of the square tube.

[0023] After the square tube is transported to the plate-type connecting assembly 6 via the transport assembly 2, the plate-type connecting assembly 6 can support the support assembly 5 through the gap at the top of the square tube, allowing the plate-type connecting assembly 6 to move continuously from the plate-type connecting assembly 6. At the same time, several support ends of the support assembly 5 can contact the inner wall of the square tube. In addition, when the welding assembly 3 welds the gap of the square tube, the clamping assembly 7 and the extrusion assembly 8 can contact the outer surface of the square tube. At this time, under the combined action of external clamping and internal support, the phenomenon of tube deformation caused by welding thermal stress is effectively suppressed, thereby ensuring the appearance quality, load-bearing capacity and production cycle of the square tube.

[0024] Furthermore, for the aforementioned transport component 2, the transport component 2 includes a transport frame 201, which is fixedly installed on the top of the processing table 1. A plurality of transport rollers 202 are rotatably connected inside the transport frame 201. The shaft ends of the plurality of transport rollers 202 pass through the transport frame 201 and are fixedly connected to sprockets 203. A chain 204 is engaged on the outer surface of the sprockets 203. A transport motor 205 is fixedly installed on the top of the processing table 1, and the output end of the transport motor 205 is fixedly connected to the shaft ends of the transport rollers 202.

[0025] Adjacent transport rollers 202 are connected together by a chain 204. This arrangement allows multiple chains to be staggered on the outer side of the transport frame 201. This connection method ensures the wrap angle between the sprocket 203 and the chain 204. At the same time, only the transport motor 205 needs to be driven to make all the transport rollers 202 rotate synchronously. When welding the gap on the square tube, the square tube is placed on top of several transport rollers 202 with the gap facing upwards. Then, the transport motor 205 is driven, causing all the transport rollers 202 to rotate. The rotating transport rollers 202 transport the square tube to the welding assembly 3.

[0026] Furthermore, for the welding assembly 3 mentioned above, the welding assembly 3 includes a support column 301, the support column 301 is fixedly installed on the top of the processing table 1, the outer surface of the support column 301 is provided with a lifting platform 302, and a laser welding head 303 is fixedly installed on one side of the lifting platform 302.

[0027] The support column 301 is equipped with a lifting screw inside. The lifting screw is connected to the lifting platform 302 through a groove on the outer surface of the support column 301. The rotation of the lifting screw allows the lifting platform 302 to drive the laser welding head 303 to adjust its height. This design allows the height of the laser welding head 303 to be adjusted according to the height of the square tube, enabling the laser welding head 303 to weld gaps in square tubes of various specifications. When welding the gap, the laser welding head 303 precisely focuses a high-energy-density laser beam onto the gap, causing the tube body at the gap to melt instantly and achieve metallurgical bonding. Subsequently, the molten pool rapidly solidifies, forming a uniform and strong weld.

[0028] Furthermore, for the aforementioned support component 5, the support component 5 includes a support box 501, which is disposed inside the mounting frame 4. The support box 501 has several moving slots 502 on all four sides. Moving rods 503 are movably connected inside the moving slots 502. Moving frame 504 is fixedly connected to the top of the moving rod 503. Several support rollers 505 are rotatably connected inside the moving frame 504.

[0029] After the transport rollers 202 transport the square tube to the predetermined position, the support box 501 can be inside the square tube. At this time, the support rollers 505 inside the movable frames 504 can contact the inner wall of the square tube. With the support of the support rollers 505, the square tube is less likely to dent during welding. The setting of the support rollers 505 reduces the friction between the square tube and the movable frame 504 when the square tube moves, thus avoiding damage to the inner wall of the square tube due to friction. At the same time, the middle of the upper support roller 505 can be recessed, so that the welding position is less likely to stick to the upper support roller 505 when welding the gap.

[0030] Furthermore, for the aforementioned support box 501, an expansion screw 506 is rotatably connected inside the support box 501, a connecting seat 507 is threadedly connected to the outer surface of the expansion screw 506, and a plurality of rotating rods 508 are rotatably connected to the outer surface of the connecting seat 507, with one end of each of the rotating rods 508 rotatably connected to a corresponding moving rod 503.

[0031] By rotating the expansion screw 506, the expansion screw 506 drives the connecting seat 507 to move inside the support box 501. At this time, the rotating rod 508 expands under the constraint of the connecting seat 507, the moving rod 503 and the moving groove 502. Meanwhile, the moving rod 503 drives the moving frame 504 to move under the pushing action of the rotating rod 508 and the constraint of the moving groove 502. Thus, the positions of several moving frames 504 can be adjusted according to the specifications of the square tube.

[0032] Furthermore, for the aforementioned plate-type connecting assembly 6, the plate-type connecting assembly 6 includes an adjusting plate 601, which is disposed inside the mounting frame 4. An L-shaped connecting plate 602 is fixedly connected to the bottom of the adjusting plate 601. One side of the L-shaped connecting plate 602 is fixedly mounted on the support box 501. Rollers 603 are rotatably connected to both the front and back of the L-shaped connecting plate 602. An adjusting screw 604 is threadedly connected to the top of the mounting frame 4. The bottom end of the adjusting screw 604 passes through the mounting frame 4 and is rotatably connected to the adjusting plate 601. Several guide rods 605 are fixedly connected inside the mounting frame 4, and the adjusting plate 601 is movably connected to the corresponding guide rod 605.

[0033] By rotating the adjusting screw 604, the adjusting plate 601 moves under the drive of the adjusting screw 604 and the guidance of the guide rod 605. The moving adjusting plate 601 then drives the support box 501 to adjust its height through the L-shaped connecting plate 602. This arrangement allows the support rollers 505 on the outside of the support box 501 to contact the inner wall of the square tube, while the bottom of the square tube can contact the transport roller 202, thus enabling the transport roller 202 to transport square tubes of different specifications normally. When the square tube moves to the L-shaped connecting plate 602 under the transport of the transport roller 202, the L-shaped connecting plate 602 can move into the gap of the square tube. At this time, the rotating roller 603 on the L-shaped connecting plate 602 contacts the inner wall of the gap, so that the rotating roller 603 can rotate synchronously when the square tube moves. This arrangement prevents the gap of the square tube from being worn due to friction, thus ensuring the effect of subsequent welding of the gap.

[0034] Furthermore, for the aforementioned clamping assembly 7, the clamping assembly 7 includes a connecting plate 701, which is disposed inside the mounting frame 4. A clamping screw 702 is threadedly connected to the front side of the connecting plate 701. One end of the clamping screw 702 passes through the connecting plate 701 and is rotatably connected to a clamping frame 703. A plurality of clamping rollers 704 are rotatably connected inside the clamping frame 703. A clamping limiting rod 705 is fixedly connected to the back side of the clamping frame 703. The clamping limiting rod 705 is movably connected to the connecting plate 701. Guide tubes 706 are fixedly connected to both sides of the connecting plate 701. The guide tubes 706 are movably connected to the corresponding guide rods 605. One side of the guide tube 706 is fixedly connected to the adjusting plate 601.

[0035] When adjusting the height of the adjusting plate 601, the adjusting plate 601 can drive the connecting plate 701 to move synchronously through the guide tube 706, so that the clamping frame 703 can always correspond to the moving frame 504. This setting ensures the effect of clamping and limiting the tube body of the square tube when the clamping frame 703 and the moving frame 504 clamp it. By rotating the clamping screw 702, the clamping frame 703 moves under the push of the clamping screw 702 and the limit of the clamping limit rod 705. When the clamping roller 704 inside the clamping frame 703 contacts the inner wall of the square tube, the rotation of the clamping screw 702 stops. At this time, the clamping roller 704 on the clamping frame 703 cooperates with the support roller 505 inside the moving frame 504 to clamp and limit the tube body on the front and rear sides of the square tube.

[0036] Furthermore, for the extrusion assembly 8 described above, the extrusion assembly 8 includes an extrusion frame 801. Two extrusion frames 801 are symmetrically arranged inside the mounting frame 4. Several extrusion rollers 802 are rotatably connected inside the extrusion frame 801. A mounting plate 803 is fixedly installed on the top of the two extrusion frames 801. An extrusion screw 804 is rotatably connected to the top of the mounting plate 803. The extrusion screw 804 is threadedly connected to the mounting frame 4. An extrusion limiting rod 805 is movably connected to the top of the mounting frame 4. The extrusion limiting rod 805 passes through the mounting frame 4 and is fixedly connected to the mounting plate 803.

[0037] By rotating the extrusion screw 804, the mounting plate 803 moves under the drive of the extrusion screw 804 and the limit of the extrusion limiting rod 805. The downward moving mounting plate 803 can drive the two extrusion frames 801 to move downward synchronously, so that the extrusion roller 802 inside the extrusion frame 801 can contact the top of the square tube. The above arrangement ensures that after the square tube moves to the bottom of the extrusion roller 802, the part of the square tube gap that was guided and deformed by passing through the L-shaped connecting plate 602 can be flattened, so that the effect of the laser welding head 303 when welding the gap can be guaranteed. At the same time, the two extrusion frames 801 can be positioned on both sides of the square tube gap under the connection of the mounting plate 803, so that the square tube gap will not be blocked.

[0038] Through the above technical solution, 1. After the square tube is transported to the plate-type connecting component 6 by the transport component 2, the plate-type connecting component 6 can support the supporting component 5 through the gap at the top of the square tube, so that the plate-type connecting component 6 can move continuously from the plate-type connecting component 6. At the same time, several supporting ends of the supporting component 5 can contact the inner wall of the square tube. In addition, when the welding component 3 welds the gap of the square tube, the clamping component 7 and the extrusion component 8 can contact the outer surface of the square tube. At this time, under the combined action of external clamping and internal support, the deformation of the tube body caused by welding thermal stress is effectively suppressed. The phenomenon of [unclear] occurs, thus ensuring the appearance quality, load-bearing capacity, and production cycle of the square tube; 2. By driving the connecting seat 507 through the expansion screw 506, the rotating rod 508 expands under the constraint of the connecting seat 507, the moving rod 503, and the moving groove 502. At the same time, the expanding rotating rod 508 can push the moving frame 504 through the moving rod 503; In the above setting, only the expansion screw 506 needs to be rotated to make the four moving frames 504 move synchronously. This setting device can support square tubes of different specifications according to different requirements, and it is also convenient to adjust.

[0039] A welding method using a laser welding fixture for square tube processing with auxiliary clamping as described above.

[0040] Working principle: Place the square tube on the transport roller 202 with the gap facing upwards, then start the transport motor 205, sprocket 203 and chain 204 to rotate all the transport rollers 202 synchronously, and thus smoothly transport the square tube to the L-shaped connecting plate 602. The square tube gap passes through the L-shaped connecting plate 602, and at the same time, the support box 501 extends into the inside of the square tube under the support of the L-shaped connecting plate 602. At this time, the support roller 505 on the moving frame 504 can tightly abut against the inner wall of the square tube and form internal support. Then, the clamping roller 704 inside the clamping frame 703 comes into contact with the tube body on the front and rear sides of the square tube, and the extrusion roller 802 on the extrusion frame 801 comes into contact with the top of the square tube. When the gap in the square tube moves to the laser welding head 303, the laser welding head 303 emits a high-energy laser beam, which is precisely focused on the leveled gap, causing it to melt instantly and achieve metallurgical bonding. After cooling, a uniform and strong weld is formed.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A laser welding fixture for auxiliary clamping of square tubes, comprising a processing table (1), characterized in that: The top of the processing table (1) is provided with a transport component (2), the upper side of the transport component (2) is provided with a welding component (3) and a mounting frame (4), the inside of the mounting frame (4) is provided with a support component (5) and a plate-type connecting component (6), the plate-type connecting component (6) is connected to the support component (5), the two sides of the support component (5) are provided with clamping components (7), the top of the support component (5) is provided with a pressing component (8), and the clamping component (7) and the pressing component (8) are both poweredly connected to the mounting frame (4); The transport component (2) is used to transport the square tube so that the square tube passes through the gap through the sheet connection component (6), while the support component (5) contacts the inner wall of the square tube. The clamping component (7) and the extrusion component (8) are used to guide and limit the outer side of the square tube so that the gap of the square tube remains flat when it is welded.

2. The laser welding fixture for auxiliary clamping of square tube processing according to claim 1, characterized in that: The transport assembly (2) includes a transport frame (201), which is fixedly installed on the top of the processing table (1). Several transport rollers (202) are rotatably connected inside the transport frame (201). The shaft ends of the several transport rollers (202) pass through the transport frame (201) and are fixedly connected to sprockets (203). A chain (204) is engaged on the outer surface of the sprockets (203). A transport motor (205) is fixedly installed on the top of the processing table (1). The output end of the transport motor (205) is fixedly connected to the shaft ends of the transport rollers (202).

3. The laser welding fixture for auxiliary clamping of square tube processing according to claim 1, characterized in that: The welding assembly (3) includes a support column (301), which is fixedly installed on the top of the processing table (1). A lifting platform (302) is provided on the outer surface of the support column (301), and a laser welding head (303) is fixedly installed on one side of the lifting platform (302).

4. The laser welding fixture for auxiliary clamping of square tube processing according to claim 1, characterized in that: The support assembly (5) includes a support box (501), which is located inside the mounting frame (4). The support box (501) has several moving slots (502) on all four sides. Moving rods (503) are movably connected inside the moving slots (502). Moving frame (504) is fixedly connected to the top of the moving rods (503). Several support rollers (505) are rotatably connected inside the moving frame (504).

5. The laser welding fixture for auxiliary clamping of square tube processing according to claim 4, characterized in that: An expansion screw (506) is rotatably connected inside the support box (501). A connecting seat (507) is threadedly connected to the outer surface of the expansion screw (506). A plurality of rotating rods (508) are rotatably connected to the outer surface of the connecting seat (507). One end of the plurality of rotating rods (508) is rotatably connected to the corresponding moving rod (503).

6. The laser welding fixture for auxiliary clamping of square tube processing according to claim 4, characterized in that: The plate-type connecting assembly (6) includes an adjusting plate (601), which is disposed inside the mounting frame (4). An L-shaped connecting plate (602) is fixedly connected to the bottom of the adjusting plate (601). One side of the L-shaped connecting plate (602) is fixedly mounted on the support box (501). Rollers (603) are rotatably connected to both the front and back sides of the L-shaped connecting plate (602). An adjusting screw (604) is threadedly connected to the top of the mounting frame (4). The bottom end of the adjusting screw (604) passes through the mounting frame (4) and is rotatably connected to the adjusting plate (601). Several guide rods (605) are fixedly connected inside the mounting frame (4). The adjusting plate (601) is movably connected to the corresponding guide rod (605).

7. The laser welding fixture for auxiliary clamping of square tube processing according to claim 6, characterized in that: The clamping assembly (7) includes a connecting plate (701), which is disposed inside the mounting frame (4). A clamping screw (702) is threadedly connected to the front of the connecting plate (701). One end of the clamping screw (702) passes through the connecting plate (701) and is rotatably connected to a clamping frame (703). Several clamping rollers (704) are rotatably connected inside the clamping frame (703). A clamping limiting rod (705) is fixedly connected to the back of the clamping frame (703). The clamping limiting rod (705) is movably connected to the connecting plate (701). Guide tubes (706) are fixedly connected to both sides of the connecting plate (701). The guide tubes (706) are movably connected to the corresponding guide rods (605). One side of the guide tube (706) is fixedly connected to the adjusting plate (601).

8. The laser welding fixture for auxiliary clamping of square tube processing according to claim 1, characterized in that: The extrusion assembly (8) includes an extrusion frame (801). Two extrusion frames (801) are symmetrically arranged inside the mounting frame (4). Several extrusion rollers (802) are rotatably connected inside the extrusion frame (801). A mounting plate (803) is fixedly installed on the top of the two extrusion frames (801). An extrusion screw (804) is rotatably connected to the top of the mounting plate (803). The extrusion screw (804) is threadedly connected to the mounting frame (4). An extrusion limiting rod (805) is movably connected to the top of the mounting frame (4). The extrusion limiting rod (805) passes through the mounting frame (4) and is fixedly connected to the mounting plate (803).

9. A welding method, characterized in that: Use the laser welding fixture for auxiliary clamping of square tube processing as described in any one of claims 1-8.

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