A roof stamping crossbeam and frame welding stress relief clamp and welding system thereof

Abstract

The present application relates to the technical field of automobile welding processing, in particular to a kind of automobile roof stamping cross beam and frame welding stress relief fixture and its welding system, solve the problem that automobile roof stamping cross beam and frame are welded, general fixture or the occlusion of the welded part is carried out, resulting in the problem that welding needs to be segmented.The first support platform and the second support platform are included, the top of the first support platform is fixed with the fixture body, the top of the second support platform is installed with two support electric telescopic rods, the top of the two support electric telescopic rods is fixed with the auxiliary support plate, and the auxiliary support plate is attached to the curve of the frame bottom.The fixture body includes a fixed plate, a first adjusting telescopic rod and a second adjusting telescopic rod are respectively arranged above and below the fixed plate.The present application can cover the clamping and fixing of automobile roof stamping cross beam and frame, and the continuous welding operation of the contact part of the welding torch to the automobile roof stamping cross beam and frame is not affected after clamping.

Description

Technical Field

[0001] This invention relates to the field of automotive welding technology, specifically to a stress-relieving fixture and welding system for welding stamped crossbeams of automotive roofs to vehicle frames. Background Technology

[0002] An automobile is a means of transportation, mainly powered by a motor, and is a non-rail-borne vehicle with four or more wheels. It is mainly used for: carrying people and / or goods, towing vehicles carrying people and / or goods, and for special purposes. The automobile body is composed of various steel and alloy components welded together. Among them, the stamped crossbeam of the automobile roof is located on the top of the automobile and is mainly fixed to the top of the frame by welding.

[0003] When welding the stamped crossbeam of an automobile roof to the vehicle frame, the usual fixtures or obstructions to the welding area cause the welding to be performed in sections, increasing the total processing time. Therefore, this does not meet the current requirements. To address this, we propose a stress-relieving fixture and welding system for welding the stamped crossbeam of an automobile roof to the vehicle frame. Summary of the Invention

[0004] The purpose of this invention is to provide a stress-relieving fixture and welding system for welding stamped crossbeams of automobile roofs to vehicle frames, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a stress-relieving fixture for welding a stamped crossbeam of an automobile roof to a vehicle frame, comprising a first support platform and a second support platform, wherein a fixture body is fixed to the top of the first support platform, and two electric telescopic support rods are installed on the top of the second support platform, and an auxiliary support plate is fixed to the top of the two electric telescopic support rods, the auxiliary support plate conforming to the bottom curve of the vehicle frame. The fixture body includes a fixed plate, with a first and a second adjustable telescopic rod respectively located above and below the fixed plate. A connecting rod is rotatably inserted through one side of the fixed plate, and a second and a first rotating plate are fixed to the outside of the connecting rod. A pivot pin is rotatably inserted through the ends of both the first and second adjustable telescopic rods. The first and second adjustable telescopic rods are rotatably connected to the fixed plate, the second rotating plate, and the first rotating plate respectively via the pivot pin. An upper clamping plate is fixed to the upper surface of the second rotating plate, and an adjustable connecting plate is located above the upper clamping plate. A connecting clamping plate is connected to the end of the adjustable connecting plate away from the upper clamping plate. A lower clamping plate is fixed to the upper surface of the first rotating plate, and the curvature of the lower clamping plate is consistent with the curvature of the auxiliary support plate.

[0006] Preferably, a short shaft is inserted through the end of the adjustable connecting plate located above the upper clamping plate. The end of the short shaft is rotatably inserted into the upper clamping plate, and a torsion spring is provided between the two ends of the short shaft and the upper clamping plate. A snap-fit ​​groove is provided on the upper surface of the upper clamping plate, and a guide groove is provided on the bottom surface of the adjustable connecting plate. The top of the guide groove is an inclined slope.

[0007] Preferably, an adjustment plate is slidably provided on the inner side of the snap-fit ​​groove. One end of the adjustment plate is bent upward and snapped into the inner side of the guide groove, and the other end of the adjustment plate is slidably inserted into the inner side of the snap-fit ​​groove. An adjustment magnet is fixed to the end of the adjustment plate located on the inner side of the snap-fit ​​groove.

[0008] Preferably, an adjusting electromagnet is fixed inside the snap-fit ​​groove, and an adjusting limit block is detachably installed on the inner side of the snap-fit ​​groove. When the adjusting electromagnet is energized, it magnetically attracts the adjusting magnet, and an adjusting reset spring is provided between the adjusting electromagnet and the end of the adjusting plate.

[0009] Preferably, one end of the adjustable connecting plate is attached to the upper surface of the connecting clamp, the upper surface of the connecting clamp is provided with a reinforcing and limiting module, and a limiting hole is opened on the upper surface of the end of the adjustable connecting plate that contacts the connecting clamp.

[0010] Preferably, the reinforcement and restriction module includes a rotating seat and a positioning column. The bottom end of the positioning column is fixed to the upper surface of the connecting clamp, and a rotating shaft is rotatably sleeved on the outer side of the positioning column. The rotating seat is penetrated by the rotating shaft and is fixedly connected to the rotating shaft.

[0011] Preferably, a transmission gear is fixed to the outer side of the top end of the rotating shaft, a rotating gear meshes with one side of the transmission gear, a rotating motor is provided at the bottom of the rotating gear, the rotating motor is fixed to the surface of the connecting clamp, and the output shaft of the rotating motor passes through the rotating gear and is fixed to the rotating gear.

[0012] Preferably, a limiting electromagnet is fixed inside the rotating seat, and a magnetic limiting post is slidably installed at the bottom of the rotating seat. When the limiting electromagnet is energized, it magnetically attracts the magnetic limiting post. A limiting spring is provided between the limiting electromagnet and the magnetic limiting post, and the bottom end of the magnetic limiting post extends to the inside of the limiting hole.

[0013] Preferably, the outer side of the magnetic limiting post is covered with an anti-detachment sleeve, which is detachably installed on the bottom of the rotating seat.

[0014] A welding system for stamped crossbeams of automobile roofs to vehicle frames includes a stress-relieving fixture for welding stamped crossbeams of automobile roofs to vehicle frames.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention utilizes an adjustable connecting plate to connect the connecting clamp and the upper clamp, enabling the upper clamp and the connecting clamp to press the stamped crossbeam of the car roof and the upper part of the frame respectively. At the same time, the adjustable connecting plate can be rotated upward to open, thereby ensuring that when the welding torch is welding the connection between the stamped crossbeam of the car roof and the frame, the welding torch can pass between the upper clamp and the connecting clamp, realizing continuous operation of the welding torch, simplifying the welding process, shortening the welding time, and thus improving welding efficiency. 2. This invention utilizes an upper clamping plate and a connecting clamping plate to press the stamped crossbeam of the car roof from above, while a lower clamping plate clamps it from the bottom of the frame, thereby fixing the stamped crossbeam of the car roof to the frame. This eliminates the welding stress caused by vibration or shaking between the stamped crossbeam of the car roof and the frame during welding operations, ensuring the welding quality of the stamped crossbeam of the car roof and the frame. 3. The present invention achieves the connection and locking of the adjustable connecting plate and the connecting clamping plate through the reinforcement and restriction module, thereby ensuring that the connecting clamping plate can move synchronously with the upper clamping plate when the adjustable connecting plate is not open, ensuring the integrity and consistency of the entire fixture body, and ensuring the normal use of the fixture. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the auxiliary support plate of the present invention; Figure 3 This is a schematic diagram of the main body of the clamp of the present invention; Figure 4 This is a schematic diagram of the assembly of the upper clamping plate and the adjusting plate of the present invention; Figure 5 for Figure 2 Enlarged view of the structure at point A in the middle; Figure 6 This is a schematic diagram of the reinforcement and restriction module of the present invention.

[0017] In the diagram: 1. First support platform; 2. Second support platform; 3. Support electric telescopic rod; 4. Auxiliary support plate; 5. Fixture body; 501. Fixed plate; 502. Lower clamping plate; 503. Upper clamping plate; 504. Connecting clamping plate; 505. First adjusting telescopic rod; 506. Second adjusting telescopic rod; 507. Connecting rod; 508. Adjusting plate; 509. First rotating plate; 510. Second rotating plate; 511. Snap-fit ​​groove; 512. Adjustable connecting plate; 5 13. Reinforcement and limiting module; 5130. Limiting spring; 5131. Rotating seat; 5132. Rotating shaft; 5133. Positioning column; 5134. Transmission gear; 5135. Rotating gear; 5136. Rotary motor; 5137. Limiting electromagnet; 5138. Magnetic limiting post; 5139. Anti-disengagement sleeve; 514. Adjusting electromagnet; 515. Adjusting reset spring; 516. Adjusting limiting block; 517. Adjusting magnet; 518. Limiting hole. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] like Figure 1 and Figure 2 As shown, a stress-relieving fixture for welding a stamped crossbeam of an automobile roof to a vehicle frame includes a first support platform 1 and a second support platform 2. The top of the first support platform 1 is fixed with a fixture body 5, and the top of the second support platform 2 is equipped with two electric telescopic support rods 3. The top ends of the two electric telescopic support rods 3 are fixed with auxiliary support plates 4. The auxiliary support plates 4 conform to the bottom curve of the vehicle frame and provide auxiliary support to the vehicle frame from below. When the fixture body 5 fixes the vehicle frame and the stamped crossbeam of the automobile roof, the auxiliary support plates 4 are used to distribute the weight of the vehicle frame.

[0020] like Figures 1 to 4As shown, the fixture body 5 includes a fixed plate 501. A first adjusting telescopic rod 505 and a second adjusting telescopic rod 506 are respectively provided above and below the fixed plate 501. A connecting rod 507 is rotatably inserted through one side of the fixed plate 501. A second rotating plate 510 and a first rotating plate 509 are fixed to the outside of the connecting rod 507. A pivot pin is rotatably inserted through the ends of both the first adjusting telescopic rod 505 and the second adjusting telescopic rod 506. The first adjusting telescopic rod 505 and the second adjusting telescopic rod 506 are rotatably connected to the fixed plate 501, the second rotating plate 510, and the first rotating plate 509 respectively via the pivot pin. An upper clamping plate 503 is fixed on the upper surface of 510. An adjustable connecting plate 512 is provided above the upper clamping plate 503. A connecting clamping plate 504 is connected to the end of the adjustable connecting plate 512 away from the upper clamping plate 503. A lower clamping plate 502 is fixed on the upper surface of the first rotating plate 509. The curvature of the lower clamping plate 502 is the same as the curvature of the auxiliary support plate 4. The upper clamping plate 503 and the connecting clamping plate 504 are used to press the car roof stamping crossbeam from above, while the lower clamping plate 502 is used to clamp from the bottom of the frame, thereby fixing the car roof stamping crossbeam to the frame and preventing vibration or shaking of the car roof stamping crossbeam or the frame during the welding process.

[0021] The adjustable connecting plate 512 is connected to a short shaft through the end above the upper clamping plate 503. The end of the short shaft is rotatably inserted into the upper clamping plate 503. Torsion springs are provided between the two ends of the short shaft and the upper clamping plate 503. The torsion springs are used to apply downward pressure to the adjustable connecting plate 512, so that the adjustable connecting plate 512 drives the connecting clamping plate 504 to press the frame from above.

[0022] The upper surface of the upper clamping plate 503 is provided with a snap-fit ​​groove 511, and the bottom surface of the adjustable connecting plate 512 is provided with a guide groove. The top of the guide groove is an inclined slope. An adjusting plate 508 is slidably provided on the inner side of the snap-fit ​​groove 511. One end of the adjusting plate 508 is bent upward and snapped into the inner side of the guide groove, and the other end of the adjusting plate 508 is slidably inserted into the inner side of the snap-fit ​​groove 511. An adjusting magnet 517 is fixed at the end of the adjusting plate 508 located inside the snap-fit ​​groove 511. By controlling the adjusting plate 508 to slide into the inner side of the snap-fit ​​groove 511, the adjusting plate 508 moves by pressing the inclined slope of the guide groove, thereby realizing the upward rotation of the adjustable connecting plate 512 and opening the adjustable connecting plate 512.

[0023] An adjusting electromagnet 514 is fixed inside the snap-fit ​​groove 511. An adjusting limit block 516 is also detachably installed on the inner side of the snap-fit ​​groove 511. When the adjusting electromagnet 514 is energized, it magnetically attracts the adjusting magnet 517. An adjusting reset spring 515 is provided between the adjusting electromagnet 514 and the end of the adjusting plate 508. The adjusting limit block 516 is used to limit the stroke of the adjusting plate 508 to prevent the adjusting plate 508 from falling off the inner side of the snap-fit ​​groove 511. The adjusting reset spring 515 is used to reset the adjusting plate 508 after it is attracted and moved.

[0024] One end of the adjustable connecting plate 512 is attached to the upper surface of the connecting clamp 504. The upper surface of the connecting clamp 504 is provided with a reinforcing and limiting module 513. A limiting hole 518 is opened on the upper surface of the end of the adjustable connecting plate 512 that contacts the connecting clamp 504. The reinforcing and limiting module 513 is used to fix the end of the adjustable connecting plate 512 to the connecting clamp 504, thereby ensuring that the upper clamp 503 moves simultaneously with the connecting clamp 504 through the adjustable connecting plate 512.

[0025] like Figure 2 , Figure 5 and Figure 6 As shown, the reinforcement and restraint module 513 includes a rotating base 5131 and a positioning column 5133. The bottom end of the positioning column 5133 is fixed to the upper surface of the connecting clamp 504, and a rotating shaft 5132 is rotatably sleeved on the outer side of the positioning column 5133. The rotating base 5131 is penetrated by the rotating shaft 5132 and is fixedly connected to the rotating shaft 5132. A transmission gear 5134 is fixed to the outer side of the top end of the rotating shaft 5132. A rotating gear 5135 meshes with one side of the transmission gear 5134. A rotary motor 5136 is provided at the bottom. The rotary motor 5136 is fixed to the surface of the connecting clamp 504, and the output shaft of the rotary motor 5136 passes through the rotary gear 5135 and is fixed to the rotary gear 5135. The rotary motor 5136, the rotary gear 5135, the transmission gear 5134, and the rotary shaft 5132 drive the rotating seat 5131 to rotate, thereby moving the rotating seat 5131 away from the top of the adjustable connecting plate 512, thus ensuring that the adjustable connecting plate 512 can rotate upward.

[0026] The rotating base 5131 has a fixed limiting electromagnet 5137 inside, and a magnetic limiting post 5138 is slidably installed at the bottom of the rotating base 5131. When the limiting electromagnet 5137 is energized, it magnetically attracts the magnetic limiting post 5138. A limiting spring 5130 is provided between the limiting electromagnet 5137 and the magnetic limiting post 5138, and the bottom end of the magnetic limiting post 5138 extends to the inside of the limiting hole 518. By inserting the magnetic limiting post 5138 into the inside of the limiting hole 518, the rotating base 5131 fixes the end of the adjustable connecting plate 512, thereby ensuring the connection and operation consistency between the connecting clamp 504 and the upper clamp 503.

[0027] The magnetic limiting post 5138 is fitted with an anti-detachment sleeve 5139 on its outer side. The anti-detachment sleeve 5139 is detachably installed on the bottom of the rotating seat 5131. The anti-detachment sleeve 5139 is used to restrict the position of the magnetic limiting post 5138, thereby preventing the magnetic limiting post 5138 from falling out of the rotating seat 5131.

[0028] A welding system for stamped crossbeams of automobile roofs to vehicle frames includes a stress-relieving fixture for welding stamped crossbeams of automobile roofs to vehicle frames.

[0029] When welding the stamped crossbeam of the car roof to the frame, the stamped crossbeam of the car roof is placed on the surface of two fixed plates 501, and the frame is placed on the upper surface of two auxiliary support plates 4. The auxiliary support plates 4 are lifted by the support electric telescopic rod 3 so that the frame and the stamped crossbeam of the car roof fit together. At this time, the first adjusting telescopic rod 505 and the second adjusting telescopic rod 506 are energized and activated. The end of the first adjusting telescopic rod 505 extends and pushes the second rotating plate 510 and the upper clamping plate 503 to rotate downward, so that the upper clamping plate 503 applies pressure from above the stamped crossbeam of the car roof. At the same time, the connecting clamping plate 504 applies pressure to the frame by means of the adjustable connecting plate 512. Meanwhile, the end of the second adjusting telescopic rod 506 extends and drives the first rotating plate 509 to rotate upward, so that the first rotating plate 509 applies pressure from the bottom of the frame. Thus, the stamped crossbeam of the car roof is fixed to the frame through the upper clamping plate 503, the connecting clamping plate 504, and the lower clamping plate 502, so as to avoid vibration or shaking of the stamped crossbeam of the car roof and the frame during welding. During welding, the connection between the stamped crossbeam of the car roof and the frame is welded using argon arc welding equipment or electric arc welding equipment. During the welding process, as the welding torch moves closer to the adjustable connecting plate 512, the limiting electromagnet 5137 is energized and attracts the magnetic limiting post 5138 upward, causing the end of the magnetic limiting post 5138 to separate from the inside of the limiting hole 518, and the limiting spring 5130 is compressed. At this time, the rotary motor 5136 drives the rotating shaft 5132 and the rotating seat 5131 to rotate through the rotating gear 5135 and the transmission gear 5134, causing the rotating seat 5131 to move away from the top of the end of the adjustable connecting plate 512. At this point, the electromagnet 514 is energized and magnetically attracts the adjusting magnet 517, causing the adjusting plate 508 to move into the locking groove 511 and compressing the adjusting return spring 515. As the adjusting plate 508 moves, it presses against the inclined surface of the guide groove, causing the adjustable connecting plate 512 to rotate upwards. After the adjustable connecting plate 512 rotates, a gap appears between the upper clamping plate 503 and the connecting clamping plate 504. This gap allows the welding torch to pass through. After the welding torch passes through the rotated adjustable connecting plate 512, the power to the adjusting electromagnet 514 is cut off, and the adjusting return spring 515 is restored. The spring 515 drives the adjusting plate 508 to reset. The adjustable connecting plate 512 resets under the action of gravity and torsion spring and contacts the connecting clamp 504 again. At this time, the rotating seat 5131 is rotated and reset, and the magnetic limiting post 5138 is locked inside the limiting hole 518 to fix the adjustable connecting plate 512. This realizes the reconnection of the upper clamp 503 and the connecting clamp 504, which can ensure that the welding gun can move freely during welding, and at the same time ensure that the upper clamp 503 and the connecting clamp 504 are always in the connected state.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A stress-relieving fixture for welding a stamped crossbeam of an automobile roof to a vehicle frame, comprising a first support platform (1) and a second support platform (2), characterized in that: The first support platform (1) is fixed with a clamp body (5) on top, and the second support platform (2) is equipped with two electric telescopic support rods (3) on top. The top of the two electric telescopic support rods (3) is fixed with an auxiliary support plate (4), which fits the bottom curve of the frame. The fixture body (5) includes a fixed plate (501). A first adjusting telescopic rod (505) and a second adjusting telescopic rod (506) are respectively provided above and below the fixed plate (501). A connecting rod (507) is rotatably inserted through one side of the fixed plate (501). A second rotating plate (510) and a first rotating plate (509) are fixed to the outside of the connecting rod (507). A shaft pin is rotatably inserted through the ends of both the first adjusting telescopic rod (505) and the second adjusting telescopic rod (506). 506) It is rotatably connected to the fixed plate (501), the second rotating plate (510) and the first rotating plate (509) respectively by the shaft pin. The upper surface of the second rotating plate (510) is fixed with an upper clamping plate (503). An adjustable connecting plate (512) is provided above the upper clamping plate (503). The end of the adjustable connecting plate (512) away from the upper clamping plate (503) is connected with a connecting clamping plate (504). The upper surface of the first rotating plate (509) is fixed with a lower clamping plate (502). The curvature of the lower clamping plate (502) is consistent with the curvature of the auxiliary support plate (4).

2. The stress-relieving fixture for welding a stamped crossbeam of an automobile roof to a vehicle frame according to claim 1, characterized in that: The adjustable connecting plate (512) has a short shaft inserted through its end above the upper clamping plate (503). The end of the short shaft is rotatably inserted into the upper clamping plate (503), and a torsion spring is provided between the two ends of the short shaft and the upper clamping plate (503). A snap-fit ​​groove (511) is provided on the upper surface of the upper clamping plate (503), and a guide groove is provided on the bottom surface of the adjustable connecting plate (512). The top of the guide groove is an inclined slope.

3. The stress-relieving fixture for welding a stamped crossbeam of an automobile roof to a vehicle frame according to claim 2, characterized in that: An adjusting plate (508) is slidably provided on the inner side of the snap-fit ​​groove (511). One end of the adjusting plate (508) is bent upward and snapped into the inner side of the guide groove. The other end of the adjusting plate (508) is slidably inserted into the inner side of the snap-fit ​​groove (511). An adjusting magnet (517) is fixed at the end of the adjusting plate (508) located inside the snap-fit ​​groove (511).

4. The stress-relieving fixture for welding a stamped crossbeam of an automobile roof to a vehicle frame according to claim 3, characterized in that: An adjusting electromagnet (514) is fixed inside the snap-fit ​​groove (511). An adjusting limit block (516) can also be detachably installed on the inner side of the snap-fit ​​groove (511). When the adjusting electromagnet (514) is energized, it magnetically attracts the adjusting magnet (517). An adjusting reset spring (515) is provided between the adjusting electromagnet (514) and the end of the adjusting plate (508).

5. The stress-relieving fixture for welding a stamped crossbeam of an automobile roof to a vehicle frame according to claim 1, characterized in that: One end of the adjustable connecting plate (512) is attached to the upper surface of the connecting clamp (504). The upper surface of the connecting clamp (504) is provided with a reinforcement and limiting module (513). A limiting hole (518) is opened on the upper surface of the end of the adjustable connecting plate (512) that contacts the connecting clamp (504).

6. The stress-relieving fixture for welding a stamped crossbeam of an automobile roof to a vehicle frame according to claim 5, characterized in that: The reinforcement and restriction module (513) includes a rotating seat (5131) and a positioning column (5133). The bottom end of the positioning column (5133) is fixed to the upper surface of the connecting clamp (504), and a rotating shaft (5132) is rotatably sleeved on the outer side of the positioning column (5133). The rotating seat (5131) is penetrated by the rotating shaft (5132) and is fixedly connected to the rotating shaft (5132).

7. The stress-relieving fixture for welding a stamped crossbeam of an automobile roof to a vehicle frame according to claim 6, characterized in that: A transmission gear (5134) is fixed to the outer side of the top of the rotating shaft (5132). A rotating gear (5135) meshes with one side of the transmission gear (5134). A rotating motor (5136) is provided at the bottom of the rotating gear (5135). The rotating motor (5136) is fixed to the surface of the connecting clamp (504), and the output shaft of the rotating motor (5136) passes through the rotating gear (5135) and is fixed to the rotating gear (5135).

8. The stress-relieving fixture for welding a stamped crossbeam of an automobile roof to a vehicle frame according to claim 7, characterized in that: The rotating seat (5131) has a fixed limiting electromagnet (5137) inside. A magnetic limiting post (5138) is slidably installed at the bottom of the rotating seat (5131). When the limiting electromagnet (5137) is energized, it magnetically attracts the magnetic limiting post (5138). A limiting spring (5130) is provided between the limiting electromagnet (5137) and the magnetic limiting post (5138). The bottom end of the magnetic limiting post (5138) extends to the inside of the limiting hole (518).

9. A stress-relieving fixture for welding a stamped crossbeam of an automobile roof to a vehicle frame according to claim 8, characterized in that: The magnetic limiting post (5138) is covered with an anti-detachment sleeve (5139), which is detachably installed on the bottom of the rotating seat (5131).

10. A system for welding stamped crossbeams of an automobile roof to a vehicle frame, characterized in that: The vehicle roof stamping crossbeam and the vehicle frame welding stress relief fixture as described in any one of claims 1-9.

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