Modularized welding clamp for large thin plate and deformation control method

Abstract

The invention discloses a modular welding clamp for a large thin plate and a deformation control method, and relates to the technical field of metal welding clamps, the modular welding clamp comprises a base, a pressing plate, a pressing module, a lower end plate, an upper end plate and a jacking module, and through cooperation of the pressing plate and the pressing module, the top wall of the base can be tightly attached to a weak area of the bottom end of a to-be-welded plate; the pressing plate is tightly attached to the top weak position of the to-be-welded plate And through cooperation of the lower end plate, the upper end plate and the jacking module, the lower end plate can be tightly attached to the upper edge of the weak position of the bottom end of the plate, and the upper end plate can be tightly attached to the lower edge of the weak position of the top end of the plate. The technical effects that the weak position on the to-be-welded plate is effectively restrained, it is ensured that the weak position on the plate is not prone to deformation in the welding process, and the welded large thin plate keeps good flatness are achieved.

Description

Technical Field

[0001] This application relates to the technical field of metal welding fixtures, and in particular to a modular welding fixture and deformation control method for large thin plate parts. Background Technology

[0002] Large sheet metal components are typically made by welding together several sheets (such as I-beams or other plates with complex cross-sections) to meet the needs of different projects. This manufacturing method greatly improves the designability and practicality of sheet metal components.

[0003] Currently, the welding of large, thin metal sheets typically requires specialized welding fixtures. These fixtures restrict the freedom of movement of the sheets to be welded, ensuring weld quality. However, some sheets, such as I-beams, have flanges that are often the weakest points due to their thin walls and low structural rigidity. During welding, these flanges are subject to localized high-temperature thermal cycling, making them highly susceptible to uneven thermal expansion and contraction. This can lead to various welding deformations, such as twisting, angular deformation, and wavy deformation, ultimately affecting the quality of the finished product. Summary of the Invention

[0004] To address the problems existing in the prior art, this application provides a modular welding fixture and deformation control method for large thin plate parts.

[0005] Firstly, this application provides a modular welding fixture for large thin-plate parts, which adopts the following technical solution: A modular welding fixture for large thin sheet metal parts includes: a base for placing the sheet metal to be welded; a pressure plate for placing on a weak point at the top of the sheet metal to be welded; a clamping module disposed on the base for pressing the pressure plate against the weak point at the top of the sheet metal to be welded; a lower end plate for attaching to the upper edge of the weak point at the bottom of the sheet metal to be welded; an upper end plate for attaching to the lower edge of the weak point at the top of the sheet metal to be welded; and a top support module disposed between the upper and lower end plates for pressing the lower end plate against the upper edge of the bottom of the sheet metal to be welded and pressing the upper end plate against the lower edge of the top of the sheet metal to be welded.

[0006] Optionally, the clamping module includes: a mounting block, on which a T-shaped groove is provided for sliding of the mounting block; a locking structure for locking and fixing the mounting block in the T-shaped groove; a threaded tie rod disposed on the mounting block; a pressure block, on which a through hole is provided for the threaded tie rod to pass through; and a limiting nut adapted to the threaded tie rod.

[0007] Optionally, the mounting block is provided with several rollers on both sides and the bottom.

[0008] Optionally, the locking structure includes a locking block, the bottom end of the mounting block is provided with a mounting groove, and the locking block is slidably disposed in the mounting groove. The threaded tie rod is threadedly connected to the mounting block and passes through the mounting groove to push the locking block to slide, so that the locking block abuts against the lower side wall of the T-shaped groove.

[0009] Optionally, a guide post is fixedly installed in the mounting groove, and a through hole is provided on the locking block for the guide post to pass through. The guide post is slidably installed in the through hole, and a limit baffle is fixedly installed at the bottom end of the guide post. A storage groove communicating with the through hole is provided at the bottom end of the locking block. A compression spring is provided in the storage groove, and one end of the compression spring abuts against the upper side wall of the storage groove, and the other end abuts against the limit baffle, for the purpose of causing the locking block to slide into the mounting groove.

[0010] Optionally, the top support module includes: a support block for placing on the lower end plate; a top support screw that slides through the support block; an adjusting nut that is threaded onto the top support screw; and a nut that is threaded onto the end of the top support screw for abutting against the upper end plate.

[0011] Optionally, the bottom end of the support block is provided with a receiving groove, the top support screw passes through the receiving groove, a slider is fixedly provided on the top support screw, the slider is adapted to the receiving groove and slidably disposed in the receiving groove, and a base plate is fixedly provided at the bottom end of the support block, a top support spring is provided in the receiving groove, and the two ends of the top support spring abut against the slider and the base plate respectively.

[0012] Optionally, multiple top support frames are slidably arranged below the base in the vertical direction, and multiple top support columns are fixedly arranged on each top support frame. The top of the base is respectively provided with a sliding groove for the top support columns to pass through. The top of each top support column is rotatably provided with a ball bearing. The base is respectively provided with a jack for driving each top support frame to move up and down.

[0013] Secondly, this application provides a deformation control method for a modular welding fixture for large thin-plate parts, employing the following technical solution: A method for controlling deformation of a modular welding fixture for large thin-plate parts includes the following steps: S1. Place all the plates to be welded onto the base, adjust the position of each plate, and level each plate. S2. Place the pressure plate on the weak point at the top of the plate to be welded, leaving welding space. Set the clamping module at the corresponding position on the base, and use the clamping module to make the pressure plate stick to the weak point at the top of the plate to be welded. S3. Attach the lower end plate to the upper edge of the weak point at the bottom of the plate to be welded, and attach the upper end plate to the lower edge of the weak point at the top of the plate to be welded, leaving welding space at the upper edge of the weak point at the bottom and the lower edge of the weak point at the top of the plate to be welded. S4. Install the top support module between the lower end plate and the upper end plate. The top support module makes the lower end plate close to the upper edge of the bottom of the plate to be welded and the upper end plate close to the lower edge of the top of the plate to be welded. This constrains the weak points on the plate to be welded and ensures that the weak points on the plate are not easily deformed during the welding process. S5. The welded large thin plate parts are connected to the welding fixture and sent into the annealing furnace for annealing treatment. S6. After annealing is complete and the plate has cooled to room temperature, remove the plate from the welding fixture, ensuring that the plate maintains good flatness.

[0014] Optionally, during annealing, the furnace temperature is controlled to rise to 610°C at a maximum rate of 80°C / hour. After holding at this temperature for 2-3 hours, the temperature is lowered to below 200°C at a maximum rate of 80°C / hour. Then, the furnace door is opened for air cooling. When the temperature of the workpiece is below 100°C, the workpiece is removed from the annealing furnace and cooled to room temperature.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. This application can effectively constrain weak points on the plates to be welded, ensuring that these weak points are not easily deformed during welding. Specifically, the base can hold the plates to be welded, providing stable support for the welding operation; through the cooperation of the pressure plate and the clamping module, the top wall of the base can be pressed against the weak area at the bottom of the plate to be welded, and the pressure plate can be pressed against the weak point at the top of the plate to be welded; furthermore, through the cooperation of the lower end plate, the upper end plate, and the top support module, the lower end plate can be pressed against the upper edge of the weak point at the bottom of the plate, and the upper end plate can be pressed against the lower edge of the weak point at the top of the plate, thus constraining the weak points of the plate to be welded. This effectively avoids uneven thermal expansion and contraction caused by local high-temperature thermal cycling during the welding process, which can lead to welding deformation problems such as twisting, angular deformation, and wave deformation, thereby improving the quality of the finished product.

[0016] 2. By setting a T-shaped groove on the base, the mounting block can slide within the T-shaped groove of the base, which facilitates the adjustment of the installation position of the clamping module to adapt to the welding requirements of different plates to be welded, thus improving the convenience of using the modular welding fixture; at the same time, by rotating and setting several rollers on both sides and the bottom of the mounting block, the mounting block can slide more smoothly within the T-shaped groove of the base.

[0017] 3. This application provides multiple vertically sliding support frames below the base, which are raised and lowered by jacks. The support columns on the support frames pass through the sliding grooves at the top of the base, allowing for flexible adjustment of the height of the support columns. This provides good support and leveling for the plates to be welded placed on the base, ensuring welding quality. Furthermore, ball bearings are installed at the top of each support column to reduce friction with the plates to be welded, facilitating adjustment of the position and angle of the plates and improving ease of use.

[0018] 4. This application involves annealing the welded large thin plate parts together with the welding fixture in an annealing furnace. During the annealing process, the furnace temperature is controlled to rise to 610°C at a maximum rate of 80°C / hour and held for 2-3 hours, which allows the internal stress of the welded plate parts to be fully released. The temperature is then lowered to below 200°C at a maximum rate of 80°C / hour to avoid generating new stress due to excessively rapid cooling. The furnace door is opened for air cooling, and the plate parts are removed from the annealing furnace and cooled to room temperature when the temperature is below 100°C, which further eliminates residual stress and ensures that the plate parts maintain good flatness. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram illustrating the structure of the top support frame according to an embodiment of this application; Figure 3 This is a schematic diagram illustrating the structure of the clamping module in an embodiment of this application; Figure 4 yes Figure 3 Enlarged view of section A; Figure 5 This is a schematic diagram illustrating the structure of the top support module in an embodiment of this application.

[0020] Explanation of reference numerals in the attached diagram: 1. Base; 11. Jack; 12. T-slot; 2. Pressure plate; 3. Clamping module; 31. Mounting block; 311. Roller; 312. Mounting slot; 313. Guide post; 314. Limiting baffle; 315. Compression spring; 32. Threaded tie rod; 33. Pressure block; 34. Limiting nut; 35. Locking block; 4. Lower end plate; 5. Upper end plate; 6. Top support module; 61. Support block; 611. Receiving slot; 612. Base plate; 613. Top support spring; 62. Top support screw; 621. Slider; 63. Adjusting nut; 64. Nut; 7. Top support frame; 71. Top support column; 72. Ball bearing. Detailed Implementation

[0021] The following will be combined with the appendix Figure 1 -Appendix Figure 5The technical solutions in the embodiments of the present invention are clearly and completely described herein. The described embodiments are only possible technical implementations of the present invention and not all possible implementations. Those skilled in the art can obtain other embodiments in conjunction with the embodiments of the present invention without creative effort, and these embodiments are also within the protection scope of the present invention.

[0022] This application mainly uses pressure plates and top support modules to constrain the weak points of thin plates, thereby preventing welding deformation of large thin plate parts and improving the quality of finished products. The following is a further detailed description of this application.

[0023] This application discloses a modular welding fixture for large, thin-plate components. (Refer to...) Figure 1 and Figure 2 The system includes a base 1, a pressure plate 2, a clamping module 3, a lower end plate 4, an upper end plate 5, and a top support module 6. The base 1 holds the plates to be welded, providing a stable support foundation for the welding operation. The pressure plate 2 is placed at the weakest point on the top of the plate to be welded. The clamping module 3 is mounted on the base 1, ensuring the pressure plate 2 is pressed tightly against the weakest point on the top of the plate. The lower end plate 4 is attached to the upper edge of the weakest point at the bottom of the plate, and the upper end plate 5 is attached to the lower edge of the weakest point at the top of the plate. The top support module 6 is positioned between the upper end plate 5 and the lower end plate 4, ensuring the lower end plate 4 is pressed tightly against the upper edge of the bottom of the plate, and the upper end plate 5 is pressed tightly against the lower edge of the top of the plate. This structural arrangement effectively constrains the weakest points of the plate, preventing various welding deformation problems caused by uneven thermal expansion and contraction due to localized high-temperature thermal cycling during welding, thus improving the quality of the finished product.

[0024] Reference Figure 1 Specifically, base 1 is made of steel and welded together, possessing sufficient structural strength. The top of base 1 is horizontally positioned to better fit the weakest point at the bottom of the plate to be welded. Pressure plate 2 is typically made of stainless steel, with a flat surface to better fit the weakest point at the top of the plate to be welded. Lower plate 4 and upper plate 5 are similar to pressure plate 2, also made of stainless steel, and their surfaces are also flat.

[0025] Reference Figure 1 and Figure 2Specifically, multiple support frames 7 are slidably mounted vertically below the base 1, and multiple support columns 71 are fixedly mounted on each support frame 7. The support frames 7 and support columns 71 can be made of high-strength steel to ensure sufficient support force. The top of the base 1 has grooves through which the support columns 71 pass. The base 1 is equipped with jacks 11 for raising and lowering each support frame 7. The jacks 11 can be hand-cranked scissor jacks 11, with their handles located on the side wall of the base 1. By operating the jacks 11, the height of the support columns 71 can be flexibly adjusted, providing good support and leveling for the plates to be welded placed on the base 1, ensuring welding quality.

[0026] Reference Figure 2 Each top support column 71 is rotatably equipped with a ball bearing 72. The ball bearing 72 can be made of hard alloy material, which has good wear resistance. The ball bearing 72 is rotatably connected to the top support column 71 through a bearing, which can reduce friction with the plate to be welded, facilitate fine adjustment of the position and angle of the plate to be welded, ensure welding quality, and improve ease of use.

[0027] Reference Figure 3 Specifically, the clamping module 3 includes a mounting block 31, a locking structure, a threaded pull rod 32, a pressure block 33, and a limiting nut 34. The mounting block 31 can be made of metal, and the top of the base 1 has multiple T-shaped slots 12. The shape of the mounting block 31 is adapted to the T-shaped slots 12 to facilitate sliding within the slots. The pressure block 33 has a through hole for the threaded pull rod 32 to pass through. The through hole can be a long, narrow, oblong hole. The limiting nut 34 is adapted to the threaded pull rod 32. When it is necessary to clamp the pressure plate 2, the pressure block 33 is placed on the threaded pull rod 32, and then the limiting nut 34 is screwed in. By rotating the limiting nut 34, the pressure of the pressure block 33 on the pressure plate 2 can be adjusted, so that the pressure plate 2 is pressed tightly against the weak point on the top of the plate to be welded.

[0028] Reference Figure 4 The mounting block 31 has several rollers 311 rotatably mounted on both sides and the bottom. The rollers 311 can be made of rubber or metal. Rubber rollers 311 have a certain degree of elasticity, which can reduce noise during sliding, while metal rollers 311 are more wear-resistant. The rollers 311 are rotatably connected to the mounting block 31 via shafts, which allows the mounting block 31 to slide more smoothly in the T-slot 12 of the base 1.

[0029] Reference Figure 4The locking structure includes a locking block 35. A mounting groove 312 is provided at the bottom of the mounting block 31, and the locking block 35 is slidably disposed within the mounting groove 312. A guide post 313 is fixedly disposed within the mounting groove 312. The guide post 313 can be cylindrical and is made of stainless steel, possessing good strength and corrosion resistance. A through hole is provided on the locking block 35 for the guide post 313 to pass through. The guide post 313 slidably passes through the through hole, and a limit baffle 314 is fixedly disposed at the bottom of the guide post 313 to prevent the locking block 35 from slipping off the guide post 313. A receiving groove communicating with the through hole is provided at the bottom of the locking block 35. A compression spring 315 is disposed within the receiving groove. One end of the compression spring 315 abuts against the upper side wall of the receiving groove, and the other end abuts against the limit baffle 314, used to allow the locking block 35 to slide inward into the mounting groove 312. The threaded tie rod 32 is threaded onto the mounting block 31 and passes through the mounting groove 312. When the threaded tie rod 32 is rotated, the locking block 35 can be pushed to slide, so that the locking block 35 abuts against the lower side wall of the T-groove 12. At the same time, under the action of the reaction force, the mounting block 31 abuts against the upper side wall of the T-groove 12, thereby locking and fixing the mounting block 31 in the T-groove 12.

[0030] Reference Figure 5 Specifically, the top support module 6 includes a support block 61, a top support screw 62, an adjusting nut 63, and a nut 64. The support block 61 is placed on the lower end plate 4 and can be made of cast iron, providing high strength and stability. The top support screw 62 slides through the support block 61, the adjusting nut 63 is threaded onto the top support screw 62, and the nut 64 is threaded onto the end of the top support screw 62, used to abut against the upper end plate 5. By rotating the adjusting nut 63, the relative position of the top support screw 62 and the support block 61 can be adjusted, thereby applying pressure to the lower end plate 4 and the upper end plate 5 respectively, so that the lower end plate 4 is pressed against the upper edge of the weakest point at the bottom of the plate to be welded, and the upper end plate 5 is pressed against the lower edge of the weakest point at the top of the plate to be welded.

[0031] Reference Figure 5The support block 61 has a receiving groove 611 at its bottom end. A top support screw 62 passes through the receiving groove 611, and a slider 621 is fixedly mounted on the top support screw 62. The slider 621 is adapted to and slidably disposed within the receiving groove 611. The slider 621 can be square or round, and its material is the same as that of the top support screw 62. It is fixedly connected to the top support screw 62 by welding or integral molding. A base plate 612 is bolted to the bottom end of the support block 61. A top support spring 613 is disposed within the receiving groove 611, and both ends of the top support spring 613 abut against the slider 621 and the base plate 612, respectively. The top support spring 613 can be made of carbon steel and has good elasticity. The top support spring 613 applies an elastic force to the slider 621 in a direction away from the base plate 612, so that the nut 64 at the end of the top support screw 62 has an elastic tendency in a direction away from the support block 61. When the top support module 6 is installed between the lower end plate 4 and the upper end plate 5, the top support spring 613 can apply a certain elastic preload to the lower end plate 4 and the upper end plate 5, providing initial support for the lower end plate 4 and the upper end plate 5, improving the convenience of installation, and making it easy to adjust the position of the lower end plate 4 and the upper end plate 5, ensuring that the installation position of the lower end plate 4 and the upper end plate 5 is accurate.

[0032] The implementation principle of a modular welding fixture for large thin plates according to an embodiment of this application is as follows: Through the synergistic action of its components, this modular welding fixture effectively constrains the weak points of the plate to be welded, preventing welding deformation. The base 1 provides stable support; the clamping module 3 and the pressure plate 2 constrain the weak points at the top of the plate from above; and the lower end plate 4, upper end plate 5, and top support module 6 constrain the weak points at the bottom and top of the plate from below and above. Simultaneously, the sliding design of the mounting block 31 and the installation of rollers 311 improve the ease of use of the fixture; the cooperation of the top support frame 7 and the jack 11 allows for flexible adjustment of the support height and flatness of the plate. Compared with existing technologies, this fixture better solves the deformation problem during welding of large thin plates and improves the quality of the finished product.

[0033] This application also discloses a deformation control method for a modular welding fixture for large thin-plate parts, comprising the following steps: S1. All the plates to be welded are hoisted onto base 1, and their positions are adjusted and leveled. In this step, hoisting equipment such as a crane is used to lift the plates onto base 1, and then measuring tools such as a level are used to adjust the position and level of the plates to ensure that they are in the appropriate welding position.

[0034] S2, place the pressure plate 2 on the weakest point on the top of the plate to be welded, leaving welding space. Set the clamping module 3 at the corresponding position on the base 1, and use the clamping module 3 to press the pressure plate 2 tightly against the weakest point on the top of the plate to be welded. When placing the pressure plate 2, ensure sufficient welding space is left to avoid affecting the welding operation.

[0035] S3, attach the lower end plate 4 to the upper edge of the weak point at the bottom of the plate to be welded, and attach the upper end plate 5 to the lower edge of the weak point at the top of the plate to be welded. When attaching the lower end plate 4 and the upper end plate 5, ensure that their positions are accurate and that welding space is left at the upper edge of the weak point at the bottom and the lower edge of the weak point at the top of the plate to be welded.

[0036] S4. Install the top support module 6 between the lower end plate 4 and the upper end plate 5. The top support module 6 makes the lower end plate 4 fit tightly against the upper edge of the bottom of the plate to be welded, and the upper end plate 5 fit tightly against the lower edge of the top of the plate to be welded. This restrains the weak points on the plate to be welded, ensuring that the weak points on the plate are not easily deformed during the welding process. When installing the top support module 6, first place the support block 61 on the lower end plate 4, and then adjust the top support screw 62 and adjusting nut 63 to make the top support module 6 generate a suitable top support force.

[0037] S5. The welded large thin sheet metal parts, connected to the welding fixture, are fed into an annealing furnace for annealing. During annealing, the furnace temperature is controlled to rise to 610°C at a maximum rate of 80°C / hour. After holding at this temperature for 2-3 hours, the temperature is lowered to below 200°C at a maximum rate of 80°C / hour. Then, the furnace door is opened for air cooling. Once the sheet metal temperature is below 100°C, the sheet metal is removed from the annealing furnace and cooled to room temperature. This annealing process can eliminate internal stress generated during welding, improving the stability and toughness of the sheet metal parts.

[0038] S6. After annealing is complete and the sheet has cooled to room temperature, remove the sheet from the welding fixture, ensuring that the sheet maintains good flatness. Handle the sheet carefully when removing it to avoid damage.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A modular welding fixture for large thin-plate parts, characterized in that, include: Base (1), used to place the plate to be welded; Pressure plate (2) is used to place on the weak point at the top of the plate to be welded; A clamping module (3) is set on the base (1) to make the pressure plate (2) press against the weak position on the top of the plate to be welded; The lower end plate (4) is used to attach to the upper edge of the weak position at the bottom of the plate to be welded; The upper end plate (5) is used to attach to the lower edge of the weakest position at the top of the plate to be welded; The top support module (6) is set between the upper end plate (5) and the lower end plate (4) to make the lower end plate (4) fit tightly against the upper edge of the weak position at the bottom of the plate to be welded, and to make the upper end plate (5) fit tightly against the lower edge of the weak position at the top of the plate to be welded.

2. A modular welding fixture for large thin-plate parts according to claim 1, characterized in that: The clamping module (3) includes: Mounting block (31), the base (1) is provided with a T-shaped groove (12) for the mounting block (31) to slide; A locking structure is used to lock and fix the mounting block (31) in the T-slot (12); A threaded tie rod (32) is mounted on the mounting block (31); The pressure block (33) has a through hole for the threaded tie rod (32) to pass through. The limiting nut (34) is adapted to the threaded tie rod (32).

3. A modular welding fixture for large thin-plate parts according to claim 2, characterized in that: The mounting block (31) is rotatably equipped with several rollers (311) on both sides and at the bottom.

4. A modular welding fixture for large thin-plate parts according to claim 2, characterized in that: The locking structure includes a locking block (35), and the bottom end of the mounting block (31) is provided with a mounting groove (312). The locking block (35) is slidably disposed in the mounting groove (312). The threaded pull rod (32) is threadedly connected to the mounting block (31) and passes through the mounting groove (312) to push the locking block (35) to slide, so that the locking block (35) abuts against the lower side wall of the T-shaped groove (12).

5. A modular welding fixture for large thin-plate parts according to claim 4, characterized in that: A guide post (313) is fixedly installed in the mounting groove (312). A through hole is provided on the locking block (35) for the guide post (313) to pass through. The guide post (313) slides through the through hole. A limit baffle (314) is fixedly installed at the bottom end of the guide post (313). A storage groove communicating with the through hole is provided at the bottom end of the locking block (35). A compression spring (315) is provided in the storage groove. One end of the compression spring (315) abuts against the upper side wall of the storage groove, and the other end abuts against the limit baffle (314) to make the locking block (35) slide into the mounting groove (312).

6. A modular welding fixture for large thin-plate parts according to claim 1, characterized in that: The top support module (6) includes: Support block (61) is used to be placed on the lower end plate (4); The top support screw (62) is slidably mounted on the support block (61); Adjusting nut (63) is threaded onto top support screw (62); The nut (64) is threaded to the end of the top support screw (62) and is used to abut against the upper end plate (5).

7. A modular welding fixture for large thin-plate parts according to claim 6, characterized in that: The bottom end of the support block (61) is provided with a receiving groove (611), the top support screw (62) passes through the receiving groove (611), a slider (621) is fixedly provided on the top support screw (62), the slider (621) is adapted to the receiving groove (611) and is slidably provided in the receiving groove (611), and a base plate (612) is fixedly provided at the bottom end of the support block (61), a top support spring (613) is provided in the receiving groove (611), and the two ends of the top support spring (613) abut against the slider (621) and the base plate (612) respectively.

8. A modular welding fixture for large thin-plate parts according to claim 1, characterized in that: Multiple top support frames (7) are slidably arranged below the base (1) in the vertical direction. Multiple top support columns (71) are fixedly arranged on each top support frame (7). The top of the base (1) is provided with a sliding groove for the top support column (71) to pass through. The top of each top support column (71) is rotatably provided with a ball bearing (72). The base (1) is provided with a jack (11) for driving each top support frame (7) to move up and down.

9. A deformation control method for a modular welding fixture for large thin-plate parts based on any one of claims 1-8, characterized in that, Includes the following steps: S1. Place each plate to be welded onto the base (1), adjust the position of each plate, and level each plate. S2. Place the pressure plate (2) on the weak position at the top of the plate to be welded, leaving welding space. Set the clamping module (3) at the corresponding position of the base (1), and use the clamping module (3) to make the pressure plate (2) stick to the weak position at the top of the plate to be welded. S3. Attach the lower end plate (4) to the upper edge of the weak position at the bottom of the plate to be welded, attach the upper end plate (5) to the lower edge of the weak position at the top of the plate to be welded, and leave welding space at the upper edge of the weak position at the bottom and the lower edge of the weak position at the top of the plate to be welded. S4. Install the top support module (6) between the lower end plate (4) and the upper end plate (5). Through the top support module (6), make the lower end plate (4) close to the upper edge of the weak position at the bottom of the plate to be welded, and make the upper end plate (5) close to the lower edge of the weak position at the top of the plate to be welded, thereby constraining the weak position on the plate to be welded and ensuring that the weak position on the plate is not easily deformed during the welding process. S5. The welded large thin plate parts are connected to the welding fixture and sent into the annealing furnace for annealing treatment. S6. After annealing is complete and the plate has cooled to room temperature, remove the plate from the welding fixture, ensuring that the plate maintains good flatness.

10. The deformation control method for a modular welding fixture for large thin plates according to claim 9, characterized in that: During annealing, the furnace temperature is controlled to rise to 610°C at a maximum rate of 80°C / hour. After holding at this temperature for 2-3 hours, the temperature is lowered to below 200°C at a maximum rate of 80°C / hour. Then, the furnace door is opened for air cooling. When the temperature of the workpiece is below 100°C, the workpiece is removed from the annealing furnace and cooled to room temperature.

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