An automobile sheet metal part welding device and a method of using the same

Abstract

The present application relates to sheet metal welding technical field, specifically to a kind of automobile sheet metal welding device and its using method, including mechanical arm, controller, fixing frame, lifting frame, press paste mechanism, attachment frame, material rack, feeding box, transmission box, feeding mechanism, MIG electric arc welding gun, flow guide mechanism and fiber pulse laser.The present application makes that overlapping sheet metal can be closely fitted together by press paste mechanism, effectively avoid sheet metal joint seam appear problem such as false welding.By feeding mechanism, it can continuously convey electrode, it is convenient to form uniform weld, by flow guide mechanism, it can preheat and guide inert gas, effectively avoid welding point heat too fast and become brittle, improve the stability, high efficiency and convenience of device.

Description

Technical Field

[0001] This invention relates to the field of sheet metal welding technology, specifically to a welding device for automotive sheet metal parts and its usage method. Background Technology

[0002] Sheet metalworking is a comprehensive cold-working process for thin metal sheets. Products manufactured using sheet metalworking are called sheet metal parts. Automotive sheet metal parts are automotive components produced using sheet metalworking and used in the final assembly of automobiles. Welding of sheet metal parts is a crucial step in automotive manufacturing. Modern automobile production utilizes assembly line operations, requiring the welding of dozens of sheet metal parts per minute, demanding high speed, high precision, and high repeatability from the welding equipment. The increasing difficulty of traditional manual welding to meet the efficiency demands of large-scale production, coupled with rising labor costs, has driven the development of automated welding equipment.

[0003] Existing devices primarily use laser beams or electric arcs to thermally melt welding electrodes to weld sheet metal parts. Many existing technologies resemble precision laser welding machines for automotive sheet metal parts. The structure disclosed in CN118650293B includes a fixed base, with an electric telescopic rod fixedly connected to the top of the fixed base. A limit bracket is also fixedly connected to the top of the fixed base, and a laser welding assembly is fixedly connected to the bottom of the limit bracket via a support. This invention eliminates the need for manual joining of the two substrates, effectively reducing the gap after joining and maintaining the flatness of the substrate surface. However, there are still areas for improvement in this device.

[0004] Automotive sheet metal parts, such as doors, roof panels, and covers, are mostly thin metal sheets, making it difficult for some parts to fit tightly against the vehicle frame during welding. This can lead to problems such as incomplete welds at some joints. Furthermore, some devices struggle to deliver welding rods stably to the welding area, resulting in uneven weld formation. Finally, some devices have difficulty preheating and guiding inert gas, making it difficult to spray the gas evenly to the welding area. This can cause some weld points to dissipate heat too quickly and become brittle, reducing the efficiency and usability of the device. Therefore, to solve these problems, an automotive sheet metal welding device and its usage method are proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a welding device for automotive sheet metal parts and its method of use, so as to solve the problems mentioned in the background art, such as incomplete welding, uneven welding and brittleness at some welding joints.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an automotive sheet metal welding device, comprising a robotic arm, a controller fixedly connected to the middle right side of the robotic arm, a fixed frame fixedly connected to the front side of the robotic arm, a lifting frame slidably connected to the inner wall of the fixed frame, a pressing mechanism provided inside the lifting frame, and a mounting frame provided on the front side inside the lifting frame.

[0007] A feeding rack is fixedly connected to the top front side of the assembly frame, a feeding box is fixedly connected to the bottom middle of the top plate of the assembly frame, a transmission box is fixedly connected to the front side of the feeding box, and a feeding mechanism is provided inside the transmission box.

[0008] The bottom of the feeding box is fixedly connected to a MIG arc welding gun, and a flow guiding mechanism is provided below the MIG arc welding gun. A fiber pulse laser is fixedly connected to the middle left side of the mounting frame.

[0009] Preferably, the pressing mechanism includes a first motor, the bottom of the first motor is fixedly connected to the top middle of the fixed frame, a transmission screw is fixedly connected to the bottom middle of the first motor, the bottom end of the transmission screw passes through the fixed frame and is fixedly connected to a push screw cylinder, and the outer wall of the push screw cylinder is fixedly connected to the inner rear side of the lifting frame.

[0010] A limit strip is fixedly connected to the rear side of the inner wall of the fixed frame, and a sliding groove corresponding to the limit strip is opened on the rear side of the lifting frame.

[0011] Preferably, the support legs on both sides of the front of the lifting frame are provided with limiting rods, the bottom end of the limiting rods is fixedly connected to the middle of both sides of the mounting frame, and springs are fixedly connected to the upper sides of both sides of the mounting frame at the outer ring of the limiting rods, and the top end of the springs is fixedly connected to the bottom of the support legs of the lifting frame.

[0012] Ball seats are fixedly connected to both sides of the bottom of the mounting frame, and rolling balls are placed inside the ball seats.

[0013] Preferably, the feeding mechanism includes a second motor, the rear side of which is fixedly connected to the front side of the transmission box, and a transmission shaft is fixedly connected to the middle of the rear side of the second motor. The middle of the rear side of the transmission shaft passes through the transmission box and is fixedly connected to a first bevel gear.

[0014] The rear side of the first bevel gear is meshed with a second bevel gear, and the inner wall of the second bevel gear is fixedly connected to a transmission worm. The top end of the transmission worm is movably connected to the top of the inner wall of the transmission box, and the bottom end of the transmission worm passes through the transmission box.

[0015] Preferably, a transmission worm gear is meshed with the rear side of the outer wall of the transmission worm, and a rotating shaft is fixedly connected to the inner wall of the transmission worm gear. The front end of the rotating shaft is movably connected to the right side of the inner wall of the transmission box, and the rear end of the rotating shaft passes through the front side wall of the feeding box and is movably connected to the rear side of the inner wall of the feeding box. A main gear is fixedly connected to the outer wall of the rotating shaft located inside the rear side of the feeding box, and a drive feeding wheel is fixedly connected to the outer wall of the rotating shaft located inside the front side of the feeding box.

[0016] Preferably, a secondary gear is meshed with the left side of the main gear, a movable shaft is fixedly connected to the inner wall of the secondary gear, the two ends of the movable shaft are movably connected to the inner left side of the feeding box, and a driven feeding wheel is fixedly connected to the front side of the outer wall of the movable shaft.

[0017] Preferably, a hexagonal bolt is inserted on the left side of the feeding rack, and the right end of the hexagonal bolt passes through the feeding rack and is threaded with a threaded sleeve. The outer wall of the hexagonal bolt is fitted with a feeding roll inside the feeding rack. The outer wall of the feeding roll is wrapped with welding rod material. One end of the welding rod material passes through the assembly frame, the feeding box and the MIG welding gun in sequence. The outer wall of the welding rod material is tightly attached to the gap between the active feeding wheel and the driven feeding wheel.

[0018] Preferably, the flow guiding mechanism includes a linkage gear, the top center of which is fixedly connected to the bottom end of the transmission worm, a driven gear meshing with the rear side of the linkage gear, a sleeve fixedly connected to the inner wall of the driven gear, turbine blades fixedly connected to the inner wall of the sleeve, a ball bearing fixedly connected to the top of the sleeve, and the inner ring of the ball bearing fixedly connected to the lower outer wall of the MIG arc welding torch.

[0019] Preferably, a ceramic heating element is fixedly connected to the middle of the inner wall of the MIG arc welding gun, and the outer ring of the ceramic heating element has air holes. An inert gas delivery pipe is fixedly connected to the upper right side of the outer wall of the MIG arc welding gun, and a conductive nozzle is fixedly connected to the top of the inner wall of the MIG arc welding gun.

[0020] A method for using an automotive sheet metal welding device includes the following steps:

[0021] S1: The controller starts the pressing mechanism to drive the lifting frame to slide downwards. The lifting frame drives the mounting frame and the ball to elastically press the overlapping sheet metal parts.

[0022] S2: The controller starts the MIG arc welding gun and fiber pulse laser. The fiber pulse laser applies the laser beam to the welding area of ​​the sheet metal to form a deep penetration hole. The MIG arc welding gun fills the hole and melts the welding wire.

[0023] S3: The controller starts the feeding mechanism to continuously feed the welding rod, so that the welding rod is continuously fed to the welding point for fusion.

[0024] S4: The flow guiding mechanism is activated by the controller, which heats the inert gas and sprays it evenly onto the welding area.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. The present invention uses a pressing mechanism to drive the ball seat and the rolling ball to elastically press onto the overlapping sheet metal parts, so that the overlapping sheet metal parts can be tightly fitted together, effectively avoiding problems such as poor welding at the joints of the sheet metal parts, and improving the stability and practicality of the device.

[0027] 2. The present invention can continuously convey welding rods through a feeding mechanism, enabling some parts of the device to stably convey welding rods to the welding area, which facilitates the formation of uniform weld seams and improves the efficiency and convenience of the device.

[0028] 3. The present invention can preheat and guide the inert gas through the flow guiding mechanism, so that the inert gas can be sprayed evenly to the welding point, effectively avoiding the welding point from becoming brittle due to excessive heat dissipation, and improving the stability and practicality of the device. Attached Figure Description

[0029] Figure 1 This is a front side perspective view of the structure of the present invention;

[0030] Figure 2 This is a front view schematic diagram of the structure of the present invention;

[0031] Figure 3 for Figure 2 A three-dimensional side view of section AA in the middle;

[0032] Figure 4 This is a front view schematic diagram of the structure of the fixing frame and the lifting frame of the present invention;

[0033] Figure 5 for Figure 4 A three-dimensional sectional view of the middle BB section;

[0034] Figure 6 This is a side view schematic diagram of the structure of the lifting frame and the mounting frame of the present invention;

[0035] Figure 7 for Figure 6 A three-dimensional sectional view at the center CC;

[0036] Figure 8 This is a front view schematic diagram of the transmission box and feeding mechanism of the present invention;

[0037] Figure 9 for Figure 8 A three-dimensional sectional view of the middle DD section;

[0038] Figure 10 This is a side view schematic diagram of the structure of the feeding box and feeding mechanism of the present invention;

[0039] Figure 11 for Figure 10 Top-view cross-sectional perspective view of the middle EE section;

[0040] Figure 12 This is an exploded perspective view of a portion of the structure of the feeding rack and feeding mechanism of the present invention;

[0041] Figure 13 for Figure 10 Top-view cross-sectional perspective view at the FF point.

[0042] In the diagram: 101. Robotic arm; 102. Controller; 103. Fixing frame; 104. Lifting frame; 105. Assembly frame; 106. Feeding rack; 107. Feeding box; 108. Transmission box; 109. MIG arc welding torch; 110. Fiber pulse laser; 2. Pressing mechanism; 201. First motor; 202. Transmission screw; 203. Pushing barrel; 204. Limiting strip; 205. Limiting rod; 206. Spring; 207. Ball seat; 208. Rolling ball; 3. Feeding mechanism; 301. Second motor; 302. Transmission shaft; 303. 304. First bevel gear; 305. Second bevel gear; 306. Transmission worm gear; 307. Transmission worm wheel; 308. Rotating shaft; 309. Main gear; 300. Driven feed wheel; 310. Secondary gear; 311. Movable shaft; 312. Driven feed wheel; 313. Hex bolt; 314. Unloading coil; 315. Screw sleeve; 4. Guide mechanism; 401. Linkage gear; 402. Driven gear; 403. Sleeve; 404. Turbine blade; 405. Ball bearing; 406. Ceramic heating element; 407. Inert gas conveying pipe; 408. Conductive nozzle sleeve. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Please see Figures 1-13 One embodiment provided by the present invention:

[0045] A welding device for automotive sheet metal parts includes a robotic arm 101. A controller 102 is fixedly connected to the middle right side of the robotic arm 101. A fixed frame 103 is fixedly connected to the front side of the robotic arm 101. A lifting frame 104 is slidably connected to the inner wall of the fixed frame 103. A pressing mechanism 2 is provided inside the lifting frame 104. A mounting frame 105 is provided inside the front side of the lifting frame 104. A feeding rack 106 is fixedly connected to the front top of the mounting frame 105. A feeding box 107 is fixedly connected to the middle bottom of the top plate of the mounting frame 105. A transmission box 108 is fixedly connected to the front side of the feeding box 107. A feeding mechanism 3 is provided inside the transmission box 108. A MIG arc welding gun 109 is fixedly connected to the bottom of the feeding box 107. A flow guiding mechanism 4 is provided below the MIG arc welding gun 109. A fiber pulse laser 110 is fixedly connected to the middle left side of the mounting frame 105.

[0046] The pressing mechanism 2 includes a first motor 201. The bottom of the first motor 201 is fixedly connected to the top center of the fixed frame 103. A transmission screw 202 is fixedly connected to the bottom center of the first motor 201. The bottom end of the transmission screw 202 passes through the fixed frame 103 and is fixedly connected to a push screw 203. The outer wall of the push screw 203 is fixedly connected to the inner rear side of the lifting frame 104. This design allows the first motor 201 to drive the transmission screw 202 to rotate in a limited position, causing the transmission screw 202 to drive the push screw 203 and the lifting frame 104 to slide up and down. A limit strip 204 is fixedly connected to the rear side of the inner wall of the fixed frame 103, and a groove corresponding to the limit strip 204 is provided on the rear side of the lifting frame 104. This design allows the lifting frame 104 to slide along the inner wall of the fixed frame 103 in a limited position.

[0047] Limiting rods 205 are inserted into the support legs on both sides of the front of the lifting frame 104. The bottom ends of the limiting rods 205 are fixedly connected to the middle of both sides of the mounting frame 105. Springs 206 are fixedly connected to the upper sides of the mounting frame 105 on the outer ring of the limiting rods 205. The top ends of the springs 206 are fixedly connected to the bottom of the support legs of the lifting frame 104. Through this design, the lifting frame 104 can elastically press down on the mounting frame 105. Ball seats 207 are fixedly connected to the bottom sides of the mounting frame 105. Rolling balls 208 are placed inside the ball seats 207. Through this design, the mounting frame 105 can press down on the overlapping sheet metal parts through the ball seats 207 and the rolling balls 208, so that the rolling balls 208 can slide smoothly along the sheet metal parts.

[0048] The feeding mechanism 3 includes a second motor 301, the rear of which is fixedly connected to the front of the transmission box 108. A transmission shaft 302 is fixedly connected to the middle of the rear of the second motor 301. The middle of the rear of the transmission shaft 302 passes through the transmission box 108 and is fixedly connected to a first bevel gear 303. This design enables the second motor 301 to drive the transmission shaft 302 and the first bevel gear 303 to rotate in a limited position. A second bevel gear 304 is meshed with the rear of the first bevel gear 303. A transmission worm 305 is fixedly connected to the inner wall of the second bevel gear 304. The top end of the transmission worm 305 is movably connected to the top of the inner wall of the transmission box 108, and the bottom end of the transmission worm 305 passes through the transmission box 108. This design enables the first bevel gear 303 to mesh and drive the second bevel gear 304 and the transmission worm 305 to rotate in a limited position.

[0049] A worm gear 306 is meshed with the rear side of the outer wall of the transmission worm 305. A rotating shaft 307 is fixedly connected to the inner wall of the transmission worm gear 306. The front end of the rotating shaft 307 is movably connected to the right side of the inner wall of the transmission box 108. The rear end of the rotating shaft 307 passes through the front side wall of the feeding box 107 and is movably connected to the rear side of the inner wall of the feeding box 107. A main gear 308 is fixedly connected to the rear side of the outer wall of the rotating shaft 307 inside the feeding box 107. A drive feed wheel 309 is fixedly connected to the front side of the outer wall of the rotating shaft 307 inside the feeding box 107. Through this design, the transmission worm 305 meshes and drives the transmission worm gear 306 and the rotating shaft 307 to rotate in a limited position, so that the rotating shaft 307 drives the main gear 308 and the drive feed wheel 309 to rotate synchronously.

[0050] A secondary gear 310 is meshed with the left side of the main gear 308. A movable shaft 311 is fixedly connected to the inner wall of the secondary gear 310. The two ends of the movable shaft 311 are movably connected to the left side of the inside of the feeding box 107. A driven feeding wheel 312 is fixedly connected to the front side of the outer wall of the movable shaft 311. Through this design, the main gear 308 meshes and drives the secondary gear 310 and the movable shaft 311 to rotate in a limited position. The movable shaft 311 drives the driven feeding wheel 312 to rotate synchronously, so that the active feeding wheel 309 cooperates with the driven feeding wheel 312 to continuously feed welding rods.

[0051] A hexagonal bolt 313 is inserted on the left side of the feeding rack 106. The right end of the hexagonal bolt 313 passes through the feeding rack 106 and is threaded with a threaded sleeve 315. The outer wall of the hexagonal bolt 313 is located inside the feeding rack 106 and a feeding roll 314 is fitted inside it. The outer wall of the feeding roll 314 is wrapped with welding rod material. One end of the welding rod material passes through the mounting frame 105, the feeding box 107, and the MIG arc welding gun 109 in sequence. The outer wall of the welding rod material is in close contact with the gap between the active feeding wheel 309 and the driven feeding wheel 312. Through this design, the hexagonal bolt 313 can be used with the threaded sleeve 315 to fit the feeding roll 314 onto the feeding rack 106, which facilitates the replacement of the feeding roll 314 and the welding rod material.

[0052] The flow guiding mechanism 4 includes a linkage gear 401, the top center of which is fixedly connected to the bottom end of the transmission worm gear 305. A driven gear 402 is meshed with the rear side of the linkage gear 401. A sleeve 403 is fixedly connected to the inner wall of the driven gear 402, and turbine blades 404 are fixedly connected to the inner wall of the sleeve 403. A ball bearing 405 is fixedly connected to the top of the sleeve 403, and the inner ring of the ball bearing 405 is fixedly connected to the lower outer wall of the MIG welding torch 109. This design enables the transmission worm gear 305 to drive the sleeve 403 to rotate in a limited position via the linkage gear 401 and the driven gear 402, causing the sleeve 403 to drive the turbine blades 404 to rotate synchronously. This allows the turbine blades 404 to disperse and guide the inert gas to the welding area.

[0053] A ceramic heating element 406 is fixedly connected to the middle of the inner wall of the MIG arc welding torch 109. The outer ring of the ceramic heating element 406 has vent holes. An inert gas delivery pipe 407 is fixedly connected to the upper right side of the outer wall of the MIG arc welding torch 109. A conductive nozzle sleeve 408 is fixedly connected to the top of the inner wall of the MIG arc welding torch 109. Preheating with inert gas by the ceramic heating element 406 effectively prevents the weld joint from becoming brittle due to excessive heat dissipation.

[0054] The operation method of the automotive sheet metal welding device is as follows: First, the fiber pulse laser 110 is activated by the controller 102, so that the laser beam of the fiber pulse laser 110 acts on the joint of the overlapping sheet metal parts to form a deep penetration hole with a predetermined depth-to-width ratio, providing an energy guiding channel for the electric arc. Then, the MIG arc welding gun 109 is activated by the controller 102, so that the MIG arc fills the hole and melts the welding wire to form a continuous weld. By adjusting the energy ratio of the laser and the arc, it can adapt to different plate thicknesses and material requirements.

[0055] When sheet metal parts need to be pressed, the first motor 201 is started by the controller 102. The first motor 201 drives the transmission screw 202 to rotate in a limited position. The transmission screw 202 drives the push screw 203 to slide downward. The push screw 203 drives the lifting frame 104 to slide along the limit bar 204. The lifting frame 104 elastically presses down the mounting frame 105 through the spring 206. The mounting frame 105 presses down the overlapping sheet metal parts through the ball seat 207 and the rolling ball 208, thus realizing the pressing operation of the sheet metal parts.

[0056] When it is necessary to feed the welding rod, the second motor 301 is first started by the controller 102. The second motor 301 drives the transmission shaft 302 to rotate in a limited position. The transmission shaft 302 drives the first bevel gear 303 to rotate synchronously. The first bevel gear 303 meshes with and drives the second bevel gear 304 and the transmission worm gear 305 to rotate in a limited position. The transmission worm gear 305 meshes with and drives the transmission worm wheel 306 and the rotating shaft 307 to rotate in a limited position. The rotating shaft 307 drives the main gear 308 and the active feeding wheel 309 to rotate synchronously. The main gear 308 meshes with and drives the secondary gear 310 to rotate. The secondary gear 310 drives the movable shaft 311 and the driven feeding wheel 312 to rotate in a limited position, so that the active feeding wheel 309 cooperates with the driven feeding wheel 312 to continuously feed the welding rod, realizing the welding rod feeding operation.

[0057] When preheating and guiding the inert gas is required, the inert gas is first preheated by the ceramic heating element 406. At the same time, the transmission worm gear 305 drives the linkage gear 401 to rotate. The linkage gear 401 meshes and drives the driven gear 402 to rotate. The driven gear 402 drives the sleeve 403 and the outer ring of the ball bearing 405 to rotate in a limiting position. The sleeve 403 drives the turbine blades 404 to rotate synchronously, so that the turbine blades 404 disperse and guide the inert gas to the welding point, thus realizing the preheating and guiding operation of the sheet metal part. The operation ends here.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A welding device for automotive sheet metal parts, comprising a robotic arm (101), characterized in that: A controller (102) is fixedly connected to the middle right side of the robotic arm (101), a fixed frame (103) is fixedly connected to the front side of the robotic arm (101), a lifting frame (104) is slidably connected to the inner wall of the fixed frame (103), a pressing mechanism (2) is provided inside the lifting frame (104), and a mounting frame (105) is provided on the front side of the inside of the lifting frame (104). The top front side of the assembly frame (105) is fixedly connected to the feeding frame (106), the bottom middle of the top plate of the assembly frame (105) is fixedly connected to the feeding box (107), the front side of the feeding box (107) is fixedly connected to the transmission box (108), and the inside of the transmission box (108) is provided with a feeding mechanism (3). The bottom of the feeding box (107) is fixedly connected to a MIG arc welding gun (109), and a flow guiding mechanism (4) is provided below the MIG arc welding gun (109). A fiber pulse laser (110) is fixedly connected to the middle left side of the mounting frame (105). The pressing mechanism (2) includes a first motor (201), the bottom of which is fixedly connected to the top middle of the fixed frame (103), and a transmission screw (202) is fixedly connected to the bottom middle of the first motor (201). The bottom end of the transmission screw (202) passes through the fixed frame (103) and is fixedly connected to a push screw cylinder (203). The outer wall of the push screw cylinder (203) is fixedly connected to the inner rear side of the lifting frame (104). Limiting rods (205) are inserted into the legs on both sides of the front of the lifting frame (104). The bottom end of the limiting rod (205) is fixedly connected to the middle of both sides of the mounting frame (105). Ball seats (207) are fixedly connected to the bottom sides of the mounting frame (105). Rolling balls (208) are placed inside the ball seats (207). The feeding mechanism (3) includes a second motor (301), the rear side of which is fixedly connected to the front side of the transmission box (108), and a transmission shaft (302) is fixedly connected to the middle of the rear side of the second motor (301). The middle of the rear side of the transmission shaft (302) passes through the transmission box (108) and is fixedly connected to a first bevel gear (303). The rear side of the first bevel gear (303) is meshed with a second bevel gear (304), and the inner wall of the second bevel gear (304) is fixedly connected with a transmission worm (305). The top end of the transmission worm (305) is movably connected to the top of the inner wall of the transmission box (108), and the bottom end of the transmission worm (305) passes through the transmission box (108). The flow guiding mechanism (4) includes a linkage gear (401), the top middle of which is fixedly connected to the bottom end of the transmission worm (305). The rear side of the linkage gear (401) is meshed with a driven gear (402). A sleeve (403) is fixedly connected to the inner wall of the driven gear (402). A turbine blade (404) is fixedly connected to the inner wall of the sleeve (403). A ball bearing (405) is fixedly connected to the top of the sleeve (403). The inner ring of the ball bearing (405) is fixedly connected to the lower outer wall of the MIG arc welding gun (109). Springs (206) are fixedly connected to the upper sides of the mounting frame (105) on the outer ring of the limiting rod (205), and the top of the springs (206) is fixedly connected to the bottom of the support leg of the lifting frame (104). A ceramic heating element (406) is fixedly connected to the middle of the inner wall of the MIG arc welding gun (109). The outer ring of the ceramic heating element (406) has air holes. An inert gas delivery pipe (407) is fixedly connected to the upper right side of the outer wall of the MIG arc welding gun (109). A conductive nozzle sleeve (408) is fixedly connected to the top of the inner wall of the MIG arc welding gun (109).

2. The automotive sheet metal welding device according to claim 1, characterized in that: The inner wall of the fixed frame (103) is fixedly connected to a limiting strip (204), and the rear side of the lifting frame (104) is provided with a sliding groove corresponding to the limiting strip (204).

3. The automotive sheet metal welding device according to claim 1, characterized in that: The outer wall of the transmission worm (305) is meshed with a transmission worm wheel (306). The inner wall of the transmission worm wheel (306) is fixedly connected to a rotating shaft (307). The front end of the rotating shaft (307) is movably connected to the right side of the inner wall of the transmission box (108). The rear end of the rotating shaft (307) passes through the front side wall of the feeding box (107) and is movably connected to the rear side of the inner wall of the feeding box (107). The outer wall of the rotating shaft (307) is fixedly connected to a main gear (308) inside the feeding box (107). The outer wall of the rotating shaft (307) is fixedly connected to a drive feeding wheel (309) inside the feeding box (107).

4. The automotive sheet metal welding device according to claim 3, characterized in that: The main gear (308) is meshed with a secondary gear (310) on its left side. A movable shaft (311) is fixedly connected to the inner wall of the secondary gear (310). The two ends of the movable shaft (311) are movably connected to the inside left side of the feeding box (107). A driven feeding wheel (312) is fixedly connected to the front side of the outer wall of the movable shaft (311).

5. The automotive sheet metal welding device according to claim 4, characterized in that: A hexagonal bolt (313) is inserted on the left side of the feeding rack (106). The right end of the hexagonal bolt (313) passes through the feeding rack (106) and is threaded with a threaded sleeve (315). The outer wall of the hexagonal bolt (313) is located inside the feeding rack (106) and a feeding roll (314) is fitted inside. The outer wall of the feeding roll (314) is wrapped with welding rod material. One end of the welding rod material passes through the assembly frame (105), the feeding box (107) and the MIG arc welding gun (109) in sequence. The outer wall of the welding rod material is tightly attached to the gap between the active feeding wheel (309) and the driven feeding wheel (312).

6. A method of using an automotive sheet metal welding device as described in any one of claims 1-5, characterized in that, Includes the following steps: S1: The pressing mechanism (2) is started by the controller (102) to drive the lifting frame (104) to slide downward. The lifting frame (104) drives the mounting frame (105) and the ball (208) to elastically press the overlapping sheet metal parts. S2: The MIG arc welding gun (109) and fiber pulse laser (110) are started by the controller (102). The fiber pulse laser (110) applies the laser beam to the welding part of the sheet metal to form a deep-penetrating small hole. The MIG arc welding gun (109) fills the small hole and melts the welding wire. S3: The feeding mechanism (3) is started by the controller (102) to continuously feed the welding rod, so that the welding rod is continuously fed to the welding point for welding; S4: The flow guiding mechanism (4) is activated by the controller (102), so that the flow guiding mechanism (4) can heat the inert gas and spray it evenly to the welding point.

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