Motorcycle part welding tool clamp and method

Abstract

The invention relates to the technical field of welding, in particular to a motorcycle part welding tool clamp and method, and the clamp comprises a base, a plurality of stand columns, a mounting seat, a plurality of clamping mechanisms and a driving mechanism; the clamping mechanism comprises a first sliding block, two sliding rods, a mounting frame, a wheel frame, an adjusting piece, a mounting shaft and a plurality of contact wheels. One end of each wheel carrier is rotationally connected with the mounting frame, the wheel carriers can be driven to rotate and incline by utilizing the adjusting parts, and the included angle between the wheel carriers and the central axis of the mounting seat is changed, so that different variable-diameter exhaust pipes are adapted, and during use, the wheel carriers of the clamping mechanisms are adjusted and rotated to proper inclination angles by utilizing the adjusting parts to be adapted to the shapes of the variable-diameter exhaust pipes; a reducing exhaust pipe is inserted from the center of the mounting seat; the driving mechanism is used for driving the multiple clamping mechanisms to synchronously gather towards the center, the variable-diameter exhaust pipe is clamped, and the contact wheel makes contact with the variable-diameter exhaust pipe; therefore, the clamp is suitable for clamping the variable-diameter exhaust pipe.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a welding fixture and method for motorcycle parts. Background Technology

[0002] As a key component of the engine exhaust system, the motorcycle exhaust pipe typically consists of a header, middle section, and tail section, and its structure often includes bends, diameter changes, and irregularly shaped transition areas. To meet the requirements of aerodynamics, noise reduction performance, and emission regulations, modern exhaust pipes generally adopt a diameter-reducing design that first narrows and then expands, meaning that the outer diameter (or inner diameter) increases linearly along the length of the pipe.

[0003] During manufacturing, multiple exhaust pipe sections need to be reliably connected by welding to ensure airtightness, structural strength, and high-temperature resistance. However, existing welding fixtures mostly use general-purpose V-blocks, fixed slots, or simple pressure plate structures, which are only suitable for straight pipes of equal diameter and cannot be used for exhaust pipes of varying diameters. Summary of the Invention

[0004] The purpose of this invention is to provide a welding fixture and method for motorcycle parts, which can be applied to the clamping of variable diameter exhaust pipes.

[0005] To achieve the above objectives, the present invention provides a welding fixture for motorcycle parts, comprising a base, multiple columns, a mounting base, and multiple clamping mechanisms; Multiple columns are fixedly mounted on the top of the base; the mounting base is fixedly mounted on the top of the multiple columns; the mounting base has multiple mounting cavities; and multiple clamping mechanisms are respectively mounted on the mounting base. The clamping mechanism includes a first slider, two slide rods, a mounting frame, a wheel frame, an adjusting component, a mounting shaft, and multiple contact wheels; The first slider is slidably disposed within the mounting cavity; the two slide rods are respectively fixedly connected to the first slider and slidably connected to the mounting base, and respectively pass through the mounting base; the mounting frame is fixedly disposed at the ends of the two slide rods; one end of the wheel frame is rotatably connected to the mounting frame, and the other end is connected to the mounting frame through the adjusting member; the mounting shaft is fixedly disposed on the wheel frame; a plurality of contact wheels are respectively rotatably disposed on the mounting shaft; The motorcycle component welding fixture also includes a drive mechanism; the drive mechanism is mounted on the mounting base and is used to drive the multiple first sliders to slide synchronously.

[0006] The drive mechanism includes a mounting sleeve, a first gear ring, multiple support plates, multiple rotating shafts, multiple first lead screws, multiple first gears, multiple driving bevel gears, and multiple driven bevel gears. The mounting sleeve is rotatably mounted on the mounting base; the first gear ring is fixedly mounted on one side of the mounting sleeve; multiple support plates are respectively fixedly mounted on the mounting base; multiple rotating shafts are respectively rotatably mounted on multiple support plates; multiple first lead screws are respectively rotatably connected to the mounting base and respectively threadedly connected to multiple first sliders, and respectively passing through multiple first sliders; multiple first gears are respectively fixedly mounted at one end of multiple rotating shafts and respectively mesh with the first gear ring; multiple driving bevel gears are respectively fixedly mounted at one end of multiple rotating shafts; multiple driven bevel gears are respectively fixedly connected to multiple first lead screws and respectively mesh with multiple driving bevel gears.

[0007] The drive mechanism further includes a motor, a second gear ring, and a second gear; The motor is fixedly mounted on the base; the second gear ring is fixedly mounted on the mounting sleeve; the second gear is fixedly mounted on the output end of the motor and meshes with the second gear ring.

[0008] The mounting bracket is provided with a mounting groove; the adjusting component includes a second slider, a connecting block, and a second lead screw. The second slider is slidably disposed in the mounting groove; one end of the connecting block is rotatably connected to the second slider, and the other end is rotatably connected to the wheel frame; the second lead screw is rotatably disposed on the mounting bracket and threadedly connected to the second slider.

[0009] The motorcycle component welding fixture also includes a displacement mechanism and a clamping plate; The displacement mechanism is mounted on the base; the abutment plate is vertically mounted on the displacement mechanism, and the displacement mechanism is used to drive the abutment plate to move.

[0010] The motorcycle component welding fixture also includes a turntable; The turntable is rotatably mounted on one side of the abutment plate.

[0011] The motorcycle component welding fixture also includes a friction pad. The friction pad is fixedly mounted on the turntable.

[0012] The displacement mechanism includes a mounting rail, a third slider, and a third lead screw; The mounting rail is fixedly mounted on the top of the base; the third slider is slidably mounted on the mounting rail and fixedly connected to the abutment plate; the third lead screw is rotatably mounted on the mounting rail and threadedly connected to the third slider.

[0013] The base has two rows of docking holes for easy installation onto a flexible workbench.

[0014] This invention also provides a method for using a welding fixture for motorcycle parts, the specific steps of which include: Using the adjusting components, the wheel frames of each clamping mechanism are adjusted and rotated to a suitable tilt angle to match the shape of the variable diameter exhaust pipe; Insert the variable diameter exhaust pipe from the center of the mounting base; Using a drive mechanism, multiple clamping mechanisms are driven to converge synchronously toward the center to clamp the variable diameter exhaust pipe, and the contact wheel contacts the variable diameter exhaust pipe.

[0015] This invention discloses a welding fixture and method for motorcycle parts. The base supports the mounting seat via multiple columns. The mounting seat is a hollow cylindrical shape. The mounting cavity is used to slidably mount the first slider. The sliding of the first slider ultimately displaces multiple contact wheels at its end. One end of the wheel frame is rotatably connected to the mounting frame. Using the adjusting member, the wheel frame can be rotated and tilted, changing the angle between the wheel frame and the central axis of the mounting seat, thereby adapting to different variable-diameter exhaust pipes. After the multiple clamping mechanisms move towards the center, they are all clamped by multiple contact wheels, facilitating the rotation of the variable-diameter exhaust pipe during welding. Furthermore, the multiple contact wheels on the same wheel frame are independent of each other. Because they contact different outer diameter parts of the variable-diameter exhaust pipe, their angular velocities are the same during rotation, but their linear velocities are different. Therefore, when the variable-diameter exhaust pipe rotates, the rotation speeds of the multiple contact wheels on the same wheel frame are also different, with the contact wheels further away from the adjusting member having higher rotation speeds. In use, the adjusting member is used to adjust the wheel frame of each clamping mechanism to a suitable tilt angle to match the shape of the variable diameter exhaust pipe; the variable diameter exhaust pipe is inserted from the center of the mounting base; the driving mechanism is used to drive multiple clamping mechanisms to converge towards the center synchronously to clamp the variable diameter exhaust pipe, and the contact wheel contacts the variable diameter exhaust pipe; thus, it can be used to clamp variable diameter exhaust pipes. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0017] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention.

[0018] Figure 2 This is a structural schematic diagram of the first embodiment of the present invention from another angle.

[0019] Figure 3 This is a front view of the first embodiment of the present invention.

[0020] Figure 4 This is a cross-sectional view of the first embodiment of the present invention.

[0021] Figure 5 yes Figure 4 A magnified view of detail A.

[0022] Figure 6 This is another cross-sectional view of the first embodiment of the present invention.

[0023] Figure 7 yes Figure 6 A magnified view of detail B.

[0024] Figure 8 yes Figure 6 A magnified view of detail C.

[0025] Figure 9 This is a flowchart illustrating the second embodiment of the present invention.

[0026] 1-Base, 2-Column, 3-Mounting base, 4-Clamping mechanism, 5-Drive mechanism, 6-Displacement mechanism, 7-Clamping plate, 8-Turntable, 9-Friction pad, 101-Mating hole, 301-Mounting cavity, 401-First slider, 402-Slide rod, 403-Mounting bracket, 404-Wheel frame, 405-Adjusting component, 406-Mounting shaft, 407-Contact wheel, 4031-Mounting groove, 4051-Second 4052-Connecting block, 4053-Second lead screw, 501-Mounting sleeve, 502-First gear ring, 503-Support plate, 504-Rotating shaft, 505-First lead screw, 506-First gear, 507-Driving bevel gear, 508-Driven bevel gear, 509-Motor, 510-Second gear ring, 511-Second gear, 601-Mounting rail, 602-Third slider, 603-Third lead screw. Detailed Implementation

[0027] The first embodiment of this application is as follows: Please see Figures 1-8 ,in, Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention. Figure 2 This is a structural schematic diagram of the first embodiment of the present invention from another angle. Figure 3 This is a front view of the first embodiment of the present invention. Figure 4 This is a cross-sectional view of the first embodiment of the present invention. Figure 5 yes Figure 4 A magnified view of detail A. Figure 6 This is another cross-sectional view of the first embodiment of the present invention. Figure 7 yes Figure 6 A magnified view of detail B. Figure 8 yes Figure 6 A magnified view of detail C.

[0028] This invention provides a welding fixture for motorcycle parts, comprising a base 1, multiple columns 2, a mounting base 3, and multiple clamping mechanisms 4; the mounting base 3 has multiple mounting cavities 301; each clamping mechanism 4 includes a first slider 401, two sliding rods 402, a mounting bracket 403, a wheel frame 404, an adjusting component 405, a mounting shaft 406, and multiple contact wheels 407; the welding fixture also includes a drive mechanism 5; the drive mechanism 5 includes a mounting sleeve 501, a first gear ring 502, multiple support plates 503, multiple rotating shafts 504, multiple first lead screws 505, multiple first gears 506, multiple driving bevel gears 507, and multiple driven bevel gears 508. The drive mechanism 5 further includes a motor 509, a second gear ring 510, and a second gear 511; the mounting bracket 403 is provided with a mounting groove 4031; the adjusting component 405 includes a second slider 4051, a connecting block 4052, and a second lead screw 4053; the motorcycle component welding fixture further includes a displacement mechanism 6 and a clamping plate 7; the motorcycle component welding fixture further includes a turntable 8; the motorcycle component welding fixture further includes a friction pad 9; the displacement mechanism 6 includes a mounting rail 601, a third slider 602, and a third lead screw 603; the base 1 is provided with two rows of docking holes 101; the aforementioned scheme can be applied to the clamping of variable diameter exhaust pipes.

[0029] Furthermore, multiple columns 2 are respectively fixedly mounted on the top of the base 1; the mounting base 3 is fixedly mounted on the top of multiple columns 2; multiple mounting cavities 301 are provided inside the mounting base 3; multiple clamping mechanisms 4 are respectively mounted on the mounting base 3; The first slider 401 is slidably disposed within the mounting cavity 301; the two slide rods 402 are respectively fixedly connected to the first slider 401 and slidably connected to the mounting base 3, and respectively pass through the mounting base 3; the mounting frame 403 is fixedly disposed at the ends of the two slide rods 402; one end of the wheel frame 404 is rotatably connected to the mounting frame 403, and the other end is connected to the mounting frame 403 through the adjusting member 405; the mounting shaft 406 is fixedly disposed on the wheel frame 404; and a plurality of contact wheels 407 are respectively rotatably disposed on the mounting shaft 406. The driving mechanism 5 is mounted on the mounting base 3 and is used to drive the multiple first sliders 401 to slide synchronously.

[0030] In this embodiment, the base 1 supports the mounting base 3 via multiple columns 2, and the mounting base 3 is a hollow cylindrical shape. The mounting cavity 301 is used to slide the first slider 401. The sliding of the first slider 401 ultimately drives the multiple contact wheels 407 at its end to move. One end of the wheel frame 404 is rotatably connected to the mounting frame 403. Using the adjusting member 405, the wheel frame 404 can be rotated and tilted, changing the angle between the wheel frame 404 and the central axis of the mounting base 3, thereby adapting to different variable diameter exhaust pipes. After the multiple clamping mechanisms 4 move toward the center, they are all clamped by multiple contact wheels 407 to facilitate the rotation of the variable diameter exhaust pipe during the welding process. Furthermore, the multiple contact wheels 407 on the same wheel frame 404 are independent of each other. Because they are in contact with different outer diameter parts of the variable diameter exhaust pipe, their angular velocities are the same when rotating, but their linear velocities are different. Therefore, when the variable diameter exhaust pipe rotates, the rotation speed of the multiple contact wheels 407 on the same wheel frame 404 is also different. The contact wheel 407 that is further away from the adjusting member 405 has a higher rotation speed. In use, the adjusting member 405 is used to adjust and rotate the wheel frame 404 of each clamping mechanism 4 to a suitable tilt angle to match the shape of the variable diameter exhaust pipe; the variable diameter exhaust pipe is inserted from the center of the mounting base 3; the driving mechanism 5 is used to drive multiple clamping mechanisms 4 to converge towards the center synchronously to clamp the variable diameter exhaust pipe, and the contact wheel 407 contacts the variable diameter exhaust pipe; thus, it can be used to clamp variable diameter exhaust pipes.

[0031] Furthermore, the mounting sleeve 501 is rotatably mounted on the mounting base 3; the first gear ring 502 is fixedly mounted on one side of the mounting sleeve 501; multiple support plates 503 are respectively fixedly mounted on the mounting base 3; multiple rotating shafts 504 are respectively rotatably mounted on multiple support plates 503; multiple first lead screws 505 are respectively rotatably connected to the mounting base 3 and respectively threadedly connected to multiple first sliders 401, and respectively pass through multiple first sliders 401; multiple first gears 506 are respectively fixedly mounted on one end of multiple rotating shafts 504 and respectively mesh with the first gear ring 502; multiple driving bevel gears 507 are respectively fixedly mounted on one end of multiple rotating shafts 504; multiple driven bevel gears 508 are respectively fixedly connected to multiple first lead screws 505 and respectively mesh with multiple driving bevel gears 507.

[0032] In this embodiment, rotating the mounting sleeve 501 causes the first gear ring 502 to rotate, which in turn drives multiple first gears 506 to rotate. These first gears 506 then drive multiple rotating shafts 504 to rotate, which in turn drive multiple active bevel gears 507 to rotate. These active bevel gears 507 then drive multiple driven bevel gears 508 to rotate, which in turn drive multiple first lead screws 505 to rotate. These first lead screws 505 then drive multiple first sliders 401 to slide, ultimately achieving synchronous movement (dispersing or converging towards the center) of the multiple clamping mechanisms 4.

[0033] Furthermore, the motor 509 is fixedly mounted on the base 1; the second gear ring 510 is fixedly mounted on the mounting sleeve 501; the second gear 511 is fixedly mounted on the output end of the motor 509 and meshes with the second gear ring 510.

[0034] In this embodiment, the motor 509 drives the second gear 511 to rotate, the second gear 511 drives the second gear ring 510 to rotate, and the second gear ring 510 drives the mounting sleeve 501 to rotate.

[0035] Furthermore, the second slider 4051 is slidably disposed within the mounting groove 4031; one end of the connecting block 4052 is rotatably connected to the second slider 4051, and the other end is rotatably connected to the wheel frame 404; the second lead screw 4053 is rotatably disposed on the mounting bracket 403 and is threadedly connected to the second slider 4051.

[0036] In this embodiment, rotating the second lead screw 4053 drives the second slider 4051 to slide within the mounting groove 4031. Through the connecting block 4052, the wheel frame 404 can be rotated, changing the tilt angle.

[0037] Furthermore, the displacement mechanism 6 is disposed on the base 1; the abutment plate 7 is vertically disposed on the displacement mechanism 6, and the displacement mechanism 6 is used to drive the abutment plate 7 to move.

[0038] In this embodiment, after one end of the variable diameter exhaust pipe is clamped by the multiple clamping mechanisms 4, the other end is pressed against the abutment plate 7, thus achieving stable clamping of the variable diameter exhaust pipe; after clamping, the outer diameter of the variable diameter exhaust pipe gradually increases when viewed from the mounting base 3 to the abutment plate 7.

[0039] Furthermore, the turntable 8 is rotatably mounted on one side of the abutment plate 7.

[0040] In this embodiment, the turntable 8 is added to replace the clamping plate 7 to clamp the variable diameter exhaust pipe, which facilitates the rotation of the variable diameter exhaust pipe.

[0041] Furthermore, the friction pad 9 is fixedly mounted on the turntable 8.

[0042] In this embodiment, the friction pad 9 is used to increase the friction between the turntable 8 and the end of the variable diameter exhaust pipe.

[0043] Furthermore, the mounting rail 601 is fixedly disposed on the top of the base 1; the third slider 602 is slidably disposed on the mounting rail 601 and is fixedly connected to the abutment plate 7; the third lead screw 603 is rotatably disposed on the mounting rail 601 and is threadedly connected to the third slider 602.

[0044] In this embodiment, rotating the third lead screw 603 drives the third slider 602 to slide, which in turn moves the abutment plate 7.

[0045] Furthermore, the base 1 is provided with two rows of docking holes 101 for easy installation onto a flexible workbench.

[0046] In this embodiment, two rows of docking holes 101 are provided on the base 1 to facilitate installation onto a flexible workbench during use.

[0047] This embodiment describes a welding fixture for motorcycle parts. The base 1 supports the mounting base 3 via multiple columns 2. The mounting base 3 is a hollow cylindrical shape. The mounting cavity 301 is used to slidably mount the first slider 401. The sliding of the first slider 401 ultimately displaces multiple contact wheels 407 at its end. One end of the wheel frame 404 is rotatably connected to the mounting frame 403. Using the adjusting member 405, the wheel frame 404 can be rotated and tilted, changing the angle between the wheel frame 404 and the central axis of the mounting base 3, thereby adapting to different... After the multiple clamping mechanisms 4 move towards the center, they are all clamped by multiple contact wheels 407 to facilitate the rotation of the variable diameter exhaust pipe during the welding process. The multiple contact wheels 407 on the same wheel frame 404 are independent of each other. Because they contact different outer diameter parts of the variable diameter exhaust pipe, their angular velocities are the same when rotating, but their linear velocities are different. Therefore, when the variable diameter exhaust pipe rotates, the rotation speed of the multiple contact wheels 407 on the same wheel frame 404 is also different. The contact wheel 407 further away from the adjusting member 405 has a higher rotation speed. In use, the adjusting member 405 is used to adjust and rotate the wheel frame 404 of each clamping mechanism 4 to a suitable tilt angle to match the shape of the variable diameter exhaust pipe; the variable diameter exhaust pipe is inserted from the center of the mounting base 3; the driving mechanism 5 is used to drive multiple clamping mechanisms 4 to converge towards the center synchronously to clamp the variable diameter exhaust pipe, and the contact wheel 407 contacts the variable diameter exhaust pipe; thus, it can be used to clamp variable diameter exhaust pipes.

[0048] The second embodiment of this application is as follows: Based on the first embodiment, please refer to Figure 9 ,in, Figure 9 This is a flowchart illustrating the second embodiment of the present invention.

[0049] The present invention provides a method for using a welding fixture for motorcycle parts, the specific steps of which include: S1: Using the adjusting component 405, the wheel frame 404 of each clamping mechanism 4 is adjusted and rotated to a suitable tilt angle to match the shape of the variable diameter exhaust pipe. S2: Insert the variable diameter exhaust pipe from the center of the mounting base 3; S3: Using the drive mechanism 5, multiple clamping mechanisms 4 are driven to converge towards the center synchronously to clamp the variable diameter exhaust pipe, and the contact wheel 407 contacts the variable diameter exhaust pipe.

[0050] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A welding fixture for motorcycle parts, characterized in that, Includes a base, multiple columns, a mounting base, and multiple clamping mechanisms; Multiple columns are fixedly mounted on the top of the base; the mounting base is fixedly mounted on the top of the multiple columns; the mounting base has multiple mounting cavities; and multiple clamping mechanisms are respectively mounted on the mounting base. The clamping mechanism includes a first slider, two slide rods, a mounting frame, a wheel frame, an adjusting component, a mounting shaft, and multiple contact wheels; The first slider is slidably disposed within the mounting cavity; the two slide rods are respectively fixedly connected to the first slider and slidably connected to the mounting base, and respectively pass through the mounting base; the mounting frame is fixedly disposed at the ends of the two slide rods; one end of the wheel frame is rotatably connected to the mounting frame, and the other end is connected to the mounting frame through the adjusting member; the mounting shaft is fixedly disposed on the wheel frame; a plurality of contact wheels are respectively rotatably disposed on the mounting shaft; The motorcycle component welding fixture also includes a drive mechanism; the drive mechanism is mounted on the mounting base and is used to drive the multiple first sliders to slide synchronously.

2. The motorcycle parts welding fixture as described in claim 1, characterized in that, The drive mechanism includes a mounting sleeve, a first gear ring, multiple support plates, multiple rotating shafts, multiple first lead screws, multiple first gears, multiple driving bevel gears, and multiple driven bevel gears; The mounting sleeve is rotatably mounted on the mounting base; the first gear ring is fixedly mounted on one side of the mounting sleeve; the plurality of support plates are respectively fixedly mounted on the mounting base; the plurality of rotating shafts are respectively rotatably mounted on the plurality of support plates; the plurality of first lead screws are respectively rotatably connected to the mounting base and respectively threadedly connected to the plurality of first sliders, and respectively pass through the plurality of first sliders; the plurality of first gears are respectively fixedly mounted at one end of the plurality of rotating shafts and respectively mesh with the first gear ring; Multiple driving bevel gears are fixedly mounted on one end of multiple rotating shafts; multiple driven bevel gears are fixedly connected to multiple first lead screws and mesh with multiple driving bevel gears respectively.

3. The motorcycle parts welding fixture as described in claim 2, characterized in that, The drive mechanism also includes a motor, a second gear ring, and a second gear; The motor is fixedly mounted on the base; the second gear ring is fixedly mounted on the mounting sleeve; the second gear is fixedly mounted on the output end of the motor and meshes with the second gear ring.

4. The motorcycle parts welding fixture as described in claim 3, characterized in that, The mounting bracket is provided with a mounting groove; the adjusting component includes a second slider, a connecting block, and a second lead screw. The second slider is slidably disposed in the mounting groove; one end of the connecting block is rotatably connected to the second slider, and the other end is rotatably connected to the wheel frame; the second lead screw is rotatably disposed on the mounting bracket and threadedly connected to the second slider.

5. The motorcycle parts welding fixture as described in claim 4, characterized in that, The motorcycle component welding fixture also includes a displacement mechanism and a clamping plate; The displacement mechanism is mounted on the base; the abutment plate is vertically mounted on the displacement mechanism, and the displacement mechanism is used to drive the abutment plate to move.

6. The motorcycle parts welding fixture as described in claim 5, characterized in that, The motorcycle component welding fixture also includes a turntable; The turntable is rotatably mounted on one side of the abutment plate.

7. The motorcycle parts welding fixture as described in claim 6, characterized in that, The motorcycle component welding fixture also includes a friction pad; The friction pad is fixedly mounted on the turntable.

8. The motorcycle parts welding fixture as described in claim 7, characterized in that, The displacement mechanism includes a mounting rail, a third slider, and a third lead screw; The mounting rail is fixedly mounted on the top of the base; the third slider is slidably mounted on the mounting rail and fixedly connected to the abutment plate; the third lead screw is rotatably mounted on the mounting rail and threadedly connected to the third slider.

9. The motorcycle parts welding fixture as described in claim 8, characterized in that, The base is provided with two rows of docking holes for easy installation onto a flexible workbench.

10. A method of using a welding fixture for motorcycle parts, applied to the welding fixture for motorcycle parts as described in claim 1; characterized in that, The specific steps include: Using the adjusting components, the wheel frames of each clamping mechanism are adjusted and rotated to a suitable tilt angle to match the shape of the variable diameter exhaust pipe; Insert the variable diameter exhaust pipe from the center of the mounting base; Using a drive mechanism, multiple clamping mechanisms are driven to converge synchronously toward the center to clamp the variable diameter exhaust pipe, and the contact wheel contacts the variable diameter exhaust pipe.

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