Aluminum sheet metal part hot welding system and welding method

Abstract

The present application relates to aluminum sheet metal hot welding technical field, specifically disclose a kind of aluminum sheet metal hot welding system and welding method, comprising: welding rod, one end fixedly installed with the welding torch outside gap, the other end fixedly installed with arc-shaped piece, and arc-shaped piece is coupled with transmission shaft, limiting column, equidistantly arranged in weld two sides, and one-side limiting column end and aluminum plate side wall keep adhering.This application can be self-adapted by equidistant distribution limiting column the arc shape of aluminum plate outer wall, and utilize guide rod to provide circumferential driving power to arc-shaped piece, make welding rod with molten pool as center and carry out sector movement, make welding torch self-adjustment and the included angle of weld, realize using physical components directly transfer curved surface information, meet tungsten electrode and the weld after the change of curved surface keeps angle constant, greatly weaken arc blow, argon covering abnormality and other problems, guarantee weld quality.

Description

Technical Field

[0001] This invention relates to aluminum sheet metal hot welding technology, specifically to an aluminum sheet metal hot welding system and welding method. Background Technology

[0002] Argon arc welding is commonly used for welding aluminum sheet metal parts because it can solve the problem of aluminum oxidation through argon gas protection. Furthermore, the precise heat input can meet the low melting point of aluminum, flexibly adapt to the complexity of sheet metal structures, and also make the weld both aesthetically pleasing and high-strength, which is the industry standard method.

[0003] For example, the publication (announcement) number: CN105618902A, publication (announcement) date: 2016-06-01, discloses an automatic argon arc welding machine for thin-walled aluminum alloy sheet metal products, which includes a wire feeding and arc ignition system, a welding sheet metal fixture device, and an xy motion platform device; the welding sheet metal fixture device is placed on the xy motion platform device; the wire feeding and arc ignition system includes a wire feeding drive device.

[0004] The shortcomings of existing technology lie in the fact that large, freestanding outdoor decorative buildings often feature decorative aluminum panels. To accommodate diverse decorative needs, these panels often have continuous, irregular curved surfaces, necessitating manual welding. Due to numerous interference factors during outdoor operations, the workshop completes welding inside the factory after receiving an order, then transfers the finished product to the site for assembly. If damage occurs during the transfer, it can be repaired on-site through welding, which also serves as a check on the product's quality. Before finishing welding the finished product, the workshop assembles and welds the multiple curved panels that make up the finished product, combining smaller components into a larger one, and then performs final finishing welding. However, because the assembled product is quite large, the final finishing work requires the use of hoisting or personnel-carrying equipment to allow workers to approach the weld seams. Therefore, manual welding of such large aluminum plate products not only requires skilled workers but also careful protection of the plates. Furthermore, the involvement of hoisting or manned equipment increases the difficulty of manual operation, making it difficult to guarantee weld quality. In particular, when welding curved surfaces with large arcs, the angle of the welding torch cannot be adjusted in time, causing the angle of argon gas ejection to change with the arc, resulting in arc blow, abnormal argon gas coverage, easy exposure of the molten pool, and aggravated oxidation and smoke generation, all of which affect weld quality. Summary of the Invention

[0005] The purpose of this invention is to provide a thermal welding system and method for aluminum sheet metal parts to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A thermal welding system for aluminum sheet metal parts includes a robotic arm with an extension arm, wherein a welding shield with a notch is fixedly mounted at the end of the extension arm, and further includes:

[0008] The welding rod has a welding gun fixedly installed at one end outside the notch, and an arc-shaped component fixedly installed at the other end, with the arc-shaped component coupled to a rotating shaft for transmission.

[0009] The limiting posts are evenly spaced on both sides of the weld, and the end of each limiting post is in contact with the sidewall of the aluminum plate.

[0010] When the limit post is driven and pushes the rotating shaft to rotate, the arc-shaped part moves along a predetermined arc-shaped path.

[0011] As a further description of the above technical solution: it also includes a welding frame for mounting the welding rod, wherein roller frames symmetrically distributed on both sides of the welding torch movement path are fixedly mounted on the welding frame.

[0012] As a further description of the above technical solution: an elastic sheet for resisting the sliding of the workpiece is fixedly installed at the end of the limiting post.

[0013] As a further description of the above technical solution: it also includes a swing arm that is connected to the rotating shaft for transmission, and the swing arm is slidably assembled with multiple limiting posts.

[0014] As a further description of the above technical solution: it also includes a transfer bar disposed between the pivot and the swing arm, wherein the transfer bar is provided with an inclined surface for pushing against the pivot and making the rotation angle of the pivot adjustable.

[0015] As a further description of the above technical solution: an elastic element is provided on the transfer bar. The elastic element is in a default state of stored force, and in this state, the transfer bar remains in contact with the rotating shaft.

[0016] As a further description of the above technical solution: a curved plate is fixedly installed at the end of the welding frame, and the inclined surface on the transfer bar is slidably connected to the surface of the curved plate.

[0017] As a further description of the above technical solution: an arc frame that slides on the outside of the rotating shaft is fixedly installed on the welding frame.

[0018] As a further description of the above technical solution: the sidewall of the welding cover is provided with a plurality of openings that connect to the gap between adjacent limiting posts.

[0019] A method for hot welding aluminum sheet metal parts, comprising the aluminum sheet metal hot welding system described in any one of the above claims, and further comprising the following steps:

[0020] S1. Use a stainless steel wire brush to physically grind along the welding area of ​​the plate, and then wipe the ground area with a lint-free cloth soaked in acetone and isopropanol.

[0021] S2. After chemically degreasing the plates, use a hot air gun to dry the welding area;

[0022] S3. Inspect the equipment and components inside the robotic arm, extension arm, and welding shield;

[0023] S4. Fix the workpiece in place and use appropriate fixtures for secure protection.

[0024] S5. Preheat the welding area using a hot air gun;

[0025] S6. Move the welding shield to the weld seam using the robotic arm and extension arm, and position the tungsten electrode on the welding torch above the molten pool. First, open the argon valve to cover the weld seam with argon gas, and then proceed with the power supply and welding work.

[0026] S7. After welding is completed, use a wire brush and a special aluminum weld cleaner to clean the weld.

[0027] S8. Remove the fixtures used to protect the workpiece.

[0028] In the above technical solution, the aluminum sheet metal hot welding system and welding method provided by the present invention have the following beneficial effects: During the welding process, the equidistantly distributed limiting posts can adapt to the arc shape of the outer wall of the aluminum plate, and the guide rod provides circumferential driving power to the arc-shaped part, so that the welding rod moves in a fan-shaped path with the center located in the welding pool. This allows the welding torch to adjust the angle with the weld seam, realizing the direct transmission of surface information by physical components and generating corresponding power, so that the welding torch adjusts the welding angle to ensure that the weld seam maintains a constant angle after the tungsten electrode and surface changes. This greatly reduces problems such as arc blow and abnormal argon gas coverage, ensures weld quality, and improves welding production efficiency. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0030] Figure 1 A schematic diagram of the assembly of an aluminum plate and a welding cover mounted on its outer side using a robotic arm and an extension arm, provided in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the weld seam and weld cover assembly between adjacent aluminum plates provided in an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of the working end face of the welding shield and its internal components provided in an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of the weld cover cross-section and the assembly of multiple limiting posts and weld seams within it, provided in an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the hollow shell of the welding shield working surface provided in an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the assembly of multiple limiting posts and swing rods provided in an embodiment of the present invention;

[0036] Figure 7 A schematic diagram of the assembly of a welding rod equipped with a welding torch and its frame and roller frame provided in an embodiment of the present invention;

[0037] Figure 8 A schematic diagram of a welding rod equipped with a welding torch and its frame and gear assembly provided for an embodiment of the present invention;

[0038] Figure 9 A rear cross-sectional view of a welding rod equipped with a welding torch and its frame and gears provided in an embodiment of the present invention;

[0039] Figure 10 A schematic diagram of the assembly of a rotating shaft with a secondary flap and a swing rod with a main flap, and a central rotating bar provided in an embodiment of the present invention;

[0040] Figure 11 for Figure 10 Enlarged view of point A;

[0041] Figure 12 This is a schematic cross-sectional view of the auxiliary flap, main flap, and transfer bar after assembly, as provided in an embodiment of the present invention.

[0042] Figure 13 for Figure 12 Enlarged view of point B;

[0043] Figure 14 The diagram shows the top view of the sub-flip plate, main flip plate, and transfer bar after assembly, as well as the position switching diagram of the sub-flip plate and main flip plate, provided in the embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Robotic arm; 11. Extending arm; 2. Aluminum plate; 3. Welding cover; 31. Side beam; 32. Horizontal beam; 33. Vertical beam; 4. Limiting post; 41. Elastic sheet; 42. Guide rod; 5. Swing rod; 51. Arc section; 52. Connecting shaft; 53. Main support block; 54. Main flap; 55. Convex plate; 6. Rotating shaft; 61. Gear; 62. Secondary support block; 63. Secondary flap; 7. Suspension; 71. Hanging rod; 72. Central transfer bar; 8. Welding frame; 81. Frame; 811. Arc frame; 82. Arc-shaped component; 83. Curved plate; 84. Welding rod; 85. Welding torch; 9. Roller frame. Detailed Implementation

[0046] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0047] Example 1

[0048] Please see Figures 1-14 This invention provides a technical solution: the welding shield 3 is driven by the robotic arm 1 to move along the weld seam direction, enabling the welding torch 85 to complete the automatic welding work without manual intervention. This reduces the labor intensity of welding and improves automation efficiency. During the welding process, the equidistantly distributed limiting posts 4 can adapt to the arc shape of the outer wall of the aluminum plate 2 and use the guide rod 42 to provide driving power to the arc-shaped part 82, causing the arc-shaped part 82 to move circumferentially upward or downward. This causes the welding rod 84 to move in a fan-shaped path, with the center of the fan located in the weld pool. At the same time, the welding torch 85 adjusts the angle between itself and the weld seam. This allows multiple limiting posts 4 to adapt to the arc surface and generate power during sliding contact, ultimately acting on the welding torch 85 to adjust the welding angle. This keeps the weld seam after the tungsten electrode and the curved surface change at a constant angle, thereby greatly reducing problems such as arc blow and abnormal argon gas coverage.

[0049] Specifically, the workpiece is formed by assembling multiple aluminum plates 2, and includes both arc-shaped concave and arc-shaped convex surfaces. The welding shield 3 is bolted and nut-mounted to the flange at the output end of the extension arm 11. When the welding shield 3 is moved by the robotic arm 1, the port of the welding shield 3 maintains a predetermined distance from the outer wall of the aluminum plate 2 (this distance is insufficient to allow all the argon gas discharged from the welding torch 85 to enter the air, allowing some argon gas to enter the welding shield 3 and then discharge downwards through the notch). The limiting post 4 and the welding torch 85 extend from the port for sliding contact and welding operations. Figure 4 As shown, the notch is located at the bottom of the welding cover 3, which facilitates the inspection of parts by the staff from the bottom of the welding cover 3.

[0050] Furthermore, the elastic sheet 41 is made of elastic metal and has an arc-shaped bulge. The two ends of the arc are welded to the ends of the limiting posts 4. This allows the arc apex to deform while maintaining sliding contact with the outer wall of the aluminum plate 2, increasing the contact area. This provides a buffering function for the components inside the welding shield 3 as they contact the outer wall of the aluminum plate 2, while also improving thermal conductivity, making it easier for heat to be transferred to the copper limiting posts 4. Combined with the openings on the sidewalls of the welding shield 3, argon gas flows through multiple limiting posts 4 and exits through the openings. Therefore, the airflow can carry away the heat absorbed by the limiting posts 4. This allows the heat redundancy caused by deceleration when welding through areas with large arcs to be absorbed and dissipated, reducing the size of the heat-affected zone. It also accelerates the cooling rate of the weld pool after welding, reducing the accelerated oxidation of the weld pool due to high temperature and contact with air.

[0051] Furthermore, the inner walls of both sides of the welding shield 3 are provided with equidistant limiting posts 4, and the limiting posts 4 on both sides are on the same plane (parallel to the upper and lower end faces of the welding shield 3). Therefore, the limiting posts 4 symmetrically arranged on both sides of the weld can also apply pressure to the aluminum plate 2 to ensure that adjacent aluminum plates 2 are on the same working surface and avoid the weld from being skewed. The ends of multiple limiting posts 4 on one side contact the outer arc surface of the aluminum plate 2 and thus move relatively parallel, causing a height difference to be generated at the end of the guide rod 42 welded (or threaded connection, or any fixed connection method known to those skilled in the art) at the other end of the limiting post 4. The height difference generates a driving force that acts on the arc-shaped part 82 through the rotating shaft 6, causing the welding rod 84 to move in a fan-shaped trajectory around the molten pool. This ensures that the hot melting position does not change during the angle adjustment process, reduces the interference factors on the molten pool, and ensures the stability of the molten pool.

[0052] In another embodiment of the present invention, the side beam 31 ensures the stability of the welding rod 84 during movement, making it less prone to angular errors when the welding torch 85 deflects around the molten pool. The roller frame 9, parallel to the welding rod 84, supports and restricts both sides of the welding torch 85, ensuring stable movement. Furthermore, the adjustable extension length of the roller frame 9 allows it to adapt to the required welding height of the welding torch 85, enabling it to be used for welding aluminum sheet metal parts of varying thicknesses.

[0053] Specifically, such as Figure 5 As shown, symmetrically distributed side beams 31 are integrally formed on the inner wall of the welding cover 3, and horizontal plates are welded to the upper and lower ends of the side beams 31. Springs that keep in contact with the horizontal plates are welded to the upper and lower ends of the arc-shaped part 82, and the two springs are not deformed in the default state, so that the deformed springs can adapt to the arc-shaped part 82 to move up and down.

[0054] Furthermore, a frame 81 is welded to the end of the welding rod 84. The end of the frame 81 has a crossbar, which serves as the welding frame 8. The arc-shaped part 82 is integrally formed on the welding frame 8. Arc frames 811 with arc-shaped channels are integrally formed on both sides of the frame 81, allowing the rotating shaft 6 to slide within the arc-shaped channels. The rotating shaft 6 rotates on the side beam 31. The purpose is to allow the circumferentially moving arc frames 811 to actively move outside the rotating shaft 6, avoiding travel interference. Similarly, the roller frame 9 itself has a curved section on its rod, also to prevent interference with the rotating shaft 6. A roller is installed at one end of the rod, and the other end is fixed by inserting and tightening with a stop block, a rectangular block, and a nut. The welding frame 8 has a square hole for inserting the rectangular block, so that the curved section is always in a vertical state. One or more metal washers can be used between the stop block and the welding frame 8. The purpose is to extend the length of the roller extending out of the welding cover 3 port so that after the roller contacts the aluminum plate 2, the height of the tungsten electrode from the weld can be adjusted to adapt to the welding work of workpieces of different thicknesses.

[0055] Furthermore, the side beam 31 is provided with an arc-shaped hole for the welding frame 8 to move in an arc shape, and the welding frame 8 has a protrusion that slides in an additional groove in the inner wall of the arc-shaped hole. The purpose is to limit the welding frame 8 on both sides so that the arc-shaped part 82 can only move in an arc shape, thus meeting the requirements for angle adjustment.

[0056] Furthermore, a vertical beam 33 is welded inside the welding cover 3, and the vertical beam 33 has holes for multiple guide rods 42 to slide through, making the movement of the limiting post 4 more stable. A spring is welded between the end of the limiting post 4 and the vertical beam 33, located on the outside of the guide rod 42. The multiple springs are of the same specification, so in the default state, the ends of all the guide rods 42 are flush, which facilitates the deflection and pushing of the swing arm 5.

[0057] In another embodiment provided by the present invention, with Figure 13 The cross-section shown is such that the intermediate strip 72 is positioned within the acute-angled triangular region between the main flap 54 and the auxiliary flap 63. When the swing arm 5 rotates under the drive of the guide rod 42, the main flap 54 also rotates. At this time, the intermediate strip 72, due to spring recovery deformation, extends deeper into the apex of the triangle (i.e., the two intermediate strips 72 move closer to each other). Consequently, the auxiliary flap 63 is compressed by the intermediate strip 72 and rotates in the opposite direction, thus creating a situation where the rotation of the swing arm 5 and the rotation of the gear 61 are opposite. Figure 4 and Figure 9Taking a frontal view as an example, when the limiting post 4 moves to the concave surface, the rocker arm 5 rotates clockwise, and the gear 61 rotates counterclockwise. The required arc-shaped component 82 moves upward in an arc shape, thereby reducing the angle between the welding torch 85 and the weld (the acute angle between the welding torch 85 and the weld increases when it moves to the concave surface and decreases when it moves to the convex surface). Conversely, when the limiting post 4 moves to the convex surface, the rocker arm 5 rotates counterclockwise, and the gear 61 rotates clockwise. The required arc-shaped component 82 moves downward in an arc shape, thereby increasing the angle between the welding torch 85 and the weld. This achieves the function of adaptive angle adjustment. Compared to electronic control adjustment, direct physical adjustment has higher stability and is effective in the long term.

[0058] Specifically, a connecting shaft 52 is welded onto the rocker arm 5, and a hole is provided on the side wall of the welding cover 3 for the connecting shaft 52 to move. A tension spring is also welded onto the rocker arm 5 on the outside of the connecting shaft 52, and the end of the tension spring is rotatably connected to the inner wall of the welding cover 3. Therefore, the connecting shaft 52 can both rotate and move along its axis, satisfying the versatility of the rocker arm 5 in operation and its usability.

[0059] Furthermore, an arc-shaped section 51 is provided on the end face where the swing rod 5 and the guide rod 42 contact. The purpose is that the swing rod 5 will only move along the axis of the connecting shaft 52 when all the guide rods 42 are simultaneously subjected to force on the arc-shaped section 51 (under the working condition of utilizing the drop, at least one guide rod 42 cannot apply pressure to the swing rod 5). Therefore, the extension arm 11 can be used in advance to drive the ends of multiple limit posts 4 to simultaneously apply pressure to the aluminum plate 2, so that the reaction force of the elastic sheet 41 can simultaneously generate a driving force for all the guide rods 42 to slide and squeeze the arc-shaped section 51. This makes the translation condition of the swing rod 5 less susceptible to interference from external factors, and the driving source for power switching is safer and more reliable.

[0060] Furthermore, such as Figure 8 , Figure 11 , Figure 13 and Figure 14 As shown, a gear 61 is fixedly sleeved in the middle of the rotating shaft 6. The inner ring of the arc-shaped part 82 has teeth integrally formed that always mesh with the gear 61, ensuring stable meshing transmission. The tooth density corresponds to a 0.5° rotation of one tooth. A secondary support block 62 (with bolts welded to it) is bolted to the end of the rotating shaft 6. Symmetrically distributed secondary flaps 63 are integrally formed on the secondary support block 62. A main support block 53 is welded to the side wall of the swing arm 5, and symmetrically distributed main flaps 54 are integrally formed on the main support block 53. A protruding plate 55 is integrally formed on the end face of the main flap 54. The vertical bevel between the protruding plate 55 and the main flap 54 is rounded to allow sliding between the rounded corner and the central rotating bar 72, providing smooth and stable power for the rounded corner sliding.

[0061] Furthermore, the side beam 31 has an integrally formed crossbeam 32 symmetrically distributed vertically on its side wall. The two ends of the transfer bar 72 are welded and fixed by the hanger rod 71, which is welded to the suspension 7. The suspension 7 has a vertical rod welded on it, and the crossbeam 32 has a through hole for the vertical rod to slide perpendicularly to the crossbeam 32. In the default state, the elastic element that stores the force is welded to the end face of the suspension 7. This elastic element is a spring, and the spring is located outside the vertical rod, allowing its end to slide on the end face of the crossbeam 32. This allows the upper and lower suspensions 7 to provide stable guidance and support for the transfer bar 72, avoiding errors and jamming problems during translational movement.

[0062] In another embodiment of the present invention, the swing arm 5 is driven to move into the welding cover 3 along the axis of the connecting shaft 52. At this time, the rounded corner of the convex plate 55 pushes the transfer bar 72 to translate, so that the position of the increased thickness of the transfer bar 72 actively moves closer to the auxiliary flip plate 63, thereby causing the auxiliary flip plate 63 to rotate a predetermined angle in advance (the main flip plate 54 is not affected by the translation of the transfer bar 72 and deflects because the swing arm 5 needs to be driven by all the guide rods 42 to remain stable, and the deflection force is less than the pressure required for the spring deformation on the guide rods 42). Therefore, the rotation of the rotating shaft 6 will eventually act on the arc-shaped part 82, so that the welding torch 85 can adjust the welding angle in advance, thereby meeting the welding requirements of different workpieces, and the range of motion remains unchanged. For example, the welding angle range is 15°-21° by default, and after adjustment it is 10°-16° or 20°-26°, making the welding adaptability stronger.

[0063] Specifically, with Figure 14 As shown, the transfer bar 72 is gradient-shaped, with the thinner end facing the inside of the welding cover 3 and the thicker end waiting to be pushed by the protrusion 55, which corresponds to the inclined surface on the transfer bar 72.

[0064] Furthermore, the curved plate 83 is welded to the end of the welding frame 8, and the curved plate 83 is made of elastic metal. The end of the curved plate 83 is more prone to deformation. Therefore, when the transfer bar 72 is translated, the thin end of the transfer bar 72 will slide against the curved plate 83. In the process, the gradually changing slope can be used to apply pressure to the curved plate 83 to increase the stability during the movement.

[0065] In another embodiment provided by the present invention, such as Figure 13 and Figure 14 As shown, during the process of the main flap 54 and the auxiliary flap 63 overlapping (the two return to the same surface, and the triangular area begins to disappear), the main flap 54 abuts against the sliding transfer bar 72 and moves away from the main support block 53 until the spring on the suspension 7 is in the default deformation and storage state, and the transfer bar 72 abuts against the ends of the main flap 54 and the auxiliary flap 63 (all three are on the same surface). When the main flap 54 is driven to adjust its angle in the opposite direction, the auxiliary flap 63, which is also in the opposite direction, opens the triangular area again. Figure 14The dotted lines in the diagram represent the main flip plate 54 and the secondary flip plate 63 after their positions have been adjusted. The transfer bar 72 then re-enters the triangular area, thereby enabling the welding torch 85 to perform a reverse angle adjustment, satisfying the need for positive and negative angle adjustments.

[0066] Specifically, the ends of the main flap 54 and the auxiliary flap 63 are provided with symmetrical rounded corners so that the end of the transfer bar 72 can smoothly slide into the triangular area from either rounded corner. This makes the adjustment of the angle upward or downward smooth due to the presence of the rounded corners, and the mechanical transmission response of the components is also faster.

[0067] Example 2

[0068] A method for hot welding aluminum sheet metal parts, comprising the aforementioned aluminum sheet metal hot welding system, and further comprising the following steps:

[0069] S1. Use a stainless steel wire brush to physically grind along the welding area of ​​the plate, and then wipe the ground area with a lint-free cloth soaked in acetone and isopropanol.

[0070] S2. After chemically degreasing the plates, use a hot air gun to dry the welding area;

[0071] S3. Inspect the equipment and components inside the robotic arm 1, the extension arm 11, and the welding cover 3;

[0072] S4. Fix the workpiece in place and use appropriate fixtures for secure protection.

[0073] S5. Preheat the welding area using a hot air gun;

[0074] S6. Move the welding shield 3 to the weld seam using the robotic arm 1 and the extension arm 11, and position the tungsten electrode on the welding torch 85 above the molten pool. First, open the argon valve to cover the weld seam with argon gas, and then proceed with the power supply and welding work.

[0075] S7. After welding is completed, use a wire brush and a special aluminum weld cleaner to clean the weld.

[0076] S8. Remove the fixtures used to protect the workpiece.

[0077] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A thermal welding system for aluminum sheet metal parts, comprising a robotic arm equipped with an extension arm, characterized in that, The extension arm end is fixedly fitted with a welding cover with a notch, and also includes: The welding rod has a welding gun fixedly installed at one end outside the notch, and an arc-shaped component fixedly installed at the other end, with the arc-shaped component coupled to a rotating shaft for transmission. The limiting posts are evenly distributed on both sides of the weld, and the end of the limiting post on one side is in contact with the side wall of the aluminum plate. The ends of multiple limiting posts on one side move relatively parallel due to contact with the arc surface of the outer wall of the aluminum plate, so that the end of the guide rod welded to the other end of the limiting post produces a height difference. The inner wall of the welding cover is integrally formed with symmetrically distributed side beams, the end of the welding rod is welded with a frame, the end of the frame is provided with a welding frame, and the arc-shaped part is integrally formed on the welding frame. The frame has an integrally formed arc frame with arc-shaped channels on both sides, and the rotating shaft slides in the arc-shaped channels and rotates on the side beam. A vertical beam is also welded inside the welding cover, and a spring located outside the guide rod is welded between the end of the limiting column and the vertical beam. A gear is fixedly sleeved in the middle of the rotating shaft, and teeth that mesh with the gear are integrally formed on the inner ring of the arc-shaped part. A secondary support block is fixedly installed at the end of the rotating shaft with bolts, and symmetrically distributed secondary flaps are integrally formed on the secondary support block. It also includes a rocker arm that is connected to the rotating shaft drive, and the rocker arm is slidably assembled with multiple limit posts; A main support block is welded to the side wall of the swing arm, and a symmetrically distributed main flap is integrally formed on the main support block. A convex plate is also integrally formed on the end face of the main flap. It also includes a central bar set between the pivot and the swing arm, and the central bar is provided with an inclined surface for pushing against the pivot and making the rotation angle of the pivot adjustable; The transfer bar is equipped with an elastic element, which is in a stored state by default, and in this state, the transfer bar remains in contact with the rotating shaft, wherein: When the limit post is driven and pushes the rotating shaft to rotate, the arc-shaped part moves along a predetermined arc-shaped path; The transfer bar is located in the acute-angled triangular area between the main flap and the secondary flap. When the swing arm is driven by the guide rod to rotate, the main flap will rotate. The transfer bar extends into the apex of the triangle due to the spring's recovery deformation, causing the secondary flap to rotate in the opposite direction due to the pressure of the transfer bar. The rotation of the swing arm and the rotation of the gear are opposite.

2. The aluminum sheet metal hot welding system according to claim 1, characterized in that, It also includes a welding frame for mounting the welding rod, on which roller frames are fixedly mounted symmetrically distributed on both sides of the welding torch's movement path.

3. The aluminum sheet metal hot welding system according to claim 1, characterized in that, An elastic sheet for resisting the sliding of the workpiece is fixedly installed at the end of the limiting post.

4. The aluminum sheet metal hot welding system according to claim 1, characterized in that, A curved plate is fixedly installed at the end of the welding frame, and the inclined surface on the transfer bar is slidably connected to the surface of the curved plate.

5. The aluminum sheet metal hot welding system according to claim 1, characterized in that, The sidewall of the welding cover has multiple openings that connect to the gaps between adjacent limiting posts.

6. A method for hot welding aluminum sheet metal parts, characterized in that, The aluminum sheet metal hot welding system according to any one of claims 1-5 further includes the following steps: S1. Use a stainless steel wire brush to physically grind along the welding area of ​​the plate, and then wipe the ground area with a lint-free cloth soaked in acetone and isopropanol. S2. After chemically degreasing the plates, use a hot air gun to dry the welding area; S3. Inspect the equipment and components inside the robotic arm, extension arm, and welding shield; S4. Fix the workpiece in place and use appropriate fixtures for secure protection. S5. Preheat the welding area using a hot air gun; S6. Move the welding shield to the weld seam using the robotic arm and extension arm, and position the tungsten electrode on the welding torch above the molten pool. First, open the argon valve to cover the weld seam with argon gas, and then proceed with the power supply and welding work. S7. After welding is completed, use a wire brush and a special aluminum weld cleaner to clean the weld. S8. Remove the fixtures used to protect the workpiece.

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