Intelligent metal spot welding equipment and spot welding method

Abstract

The invention relates to the field of intelligent welding systems, in particular to intelligent metal spot welding equipment and a spot welding method. Intelligent metal spot welding equipment comprises a laser beam spot welding gun, the laser beam spot welding gun is fixed to a lifting base, and an ultrasonic generator is fixed to the lifting base. A method for conducting spot welding through the intelligent metal spot welding equipment comprises the following steps that S1, two metal plates are selected, and whether deformation and crack defects exist or not is carefully checked; s2, the two metal plates are placed on the upper side of the flat plate; s3, the edges of the two metal plates are pressed to each other, and the pressing positions are placed at the strip holes; s4, two pressing rods are pressed on the two metal plates at the same time, and the two metal plates are fixed to the upper side of the flat plate; s5, a laser beam spot welding gun is driven to vibrate slightly at high frequency, and then the laser beam spot welding gun is spot-welded to the press-fit position of the two metal plates; and S6, a plurality of welding spots are formed at the press-fit position of the two metal plates in a spot welding mode, and the two metal plates are spot-welded together.

Description

Technical Field

[0001] The present invention relates to the field of intelligent welding systems, and more specifically to intelligent metal spot welding equipment and a spot welding method. Background Art

[0002] In modern industrial production, spot welding, as an important connection process, is widely used in many fields such as automobile manufacturing, electronic equipment production, aerospace, etc. The quality of spot welding is directly related to the performance and reliability of the product. At present, traditional spot welding equipment has certain limitations in process implementation. During the spot welding process, an oxide film is often formed on the surface of the workpiece. The existence of this oxide film seriously hinders the effective bonding between metal atoms, thereby affecting the welding quality. Existing spot welding equipment cannot perform high-frequency micro-vibrations. During spot welding, high-frequency micro-vibrations can have a special effect on the surface of the workpiece. Through high-frequency subtle impacts, it helps to break the oxide film on the surface of the workpiece, making the contact between metal atoms closer, thereby significantly enhancing the bonding strength of the weld. However, the existing technology is unable to achieve this key function. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a metal intelligent spot welding device and a spot welding method, which has the beneficial effect that the laser beam spot welding gun can perform high-frequency micro-vibration, which helps to break the oxide film on the surface of the workpiece and enhance the bonding strength of the welding.

[0004] A metal intelligent spot welding device comprises a laser beam spot welding gun, wherein the laser beam spot welding gun is fixed on a lifting seat, and an ultrasonic generator is fixed on the lifting seat.

[0005] The lifting seat is vertically slidably connected to the end of the lifting rod, and retaining rings are fixed at both ends of the lifting seat. Two compression springs are sleeved on the lifting seat, and the two compression springs are respectively located on both sides of the lifting rod, and the two compression springs are respectively pressed on the two retaining rings.

[0006] A second telescopic rod is fixed on the lifting rod, a pressing sheet is fixed on the second telescopic rod, and the pressing sheet is pressed on one of the retaining rings.

[0007] A T-shaped block is fixed on the lower side of the lifting rod, and a metal column is respectively inserted at both ends of the T-shaped block. Semi-ring covers are fixed to the front of the two metal columns. The laser beam spot welding gun is located between the two semi-ring covers. Stop pins are inserted at both ends of the T-shaped block, and the two stop pins are respectively blocked on the outside of the two metal columns.

[0008] A metal intelligent spot welding device is used for spot welding, comprising the following steps: S1: Select two metal plates and carefully check for deformation and crack defects; S2: Place two metal plates on the upper side of the flat plate; S3: Press the edges of the two metal plates together, with the pressing position being placed at the strip hole; S4: The two metal plates are fixed on the upper side of the flat plate by pressing the two pressure rods on the two metal plates at the same time; S5: driving the laser beam spot welding gun to vibrate slightly at a high frequency, and then making the laser beam spot welding gun spot weld at the pressed part of the two metal plates; S6: Multiple welding spots are spot welded at the pressed joint of the two metal plates to spot weld the two metal plates together. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0010] Figure 1 A schematic diagram of the structure of a metal intelligent spot welding device Figure 1 ; Figure 2 A schematic diagram of the structure of a metal intelligent spot welding device Figure 2 ; Figure 3 A schematic diagram of the structure of a metal intelligent spot welding device Figure 3 ; Figure 4 The structure of the plate Figure 1 ; Figure 5 The structure of the plate Figure 2 ; Figure 6 It is a structural schematic diagram of an L-shaped frame; Figure 7 The structure of the lifting rod Figure 1 ; Figure 8 The structure of the lifting rod Figure 2 ; Fig. 9 The structure of the compression rod Figure 1 ; Fig.10 The structure of the compression rod Figure 2 ; Fig.11 The structure of the half ring cover Figure 1 ; Fig.12 The structure of the half ring cover Figure 2 ; Fig.13 The structure of the front panel Figure 1 ; Fig.14 The structure of the front panel Figure 2 ; In the figure: a plate 101; a strip hole 102; a support leg 103; a cushion block 104; a slide seat 105; a slide rail 106; a track frame 107; a motor frame 108; a motor 109; a screw rod 110; a protruding piece 111; L-shaped frame 201; telescopic rod 202; Lifting rod 301; electromagnet 302; laser beam spot welding gun 303; lifting seat 304; retaining ring 305; ultrasonic generator 306; pressing sheet 307; telescopic rod 2 308; cylinder 309; Pressure rod 401; handle 402; slider 403; disc 404; round rod 405; rubber strip 406; Semi-ring cover 501; metal column 502; stop pin 503; T-shaped block 504; Front plate 601; filling block 602; vertical groove 603; anti-slip strip 604; hand lever 605; door frame 606; lifting beam 607. DETAILED DESCRIPTION

[0011] like Figure 7-8 As shown; Since the metal intelligent spot welding equipment includes a laser beam spot welding gun 303, the laser beam spot welding gun 303 is connected to the lifting seat 304 by screws, and the lifting seat 304 is connected to the ultrasonic generator 306 by screws. The ultrasonic generator 306 emits ultrasonic waves, driving the lifting seat 304 and the laser beam spot welding gun 303 to vibrate at high frequency, which helps to break the oxide film on the surface of the workpiece and enhance the bonding strength of the welding; for workpieces of harder materials, increasing the vibration frequency of the electrode helps to break the oxide film on the surface of the workpiece, improve the contact between the electrode and the workpiece, enhance the welding effect, and improve the bonding strength of the weld.

[0012] The frequency of the ultrasonic wave emitted by the ultrasonic generator 306 can also be adjusted intelligently through existing technology. During the welding process, the ultrasonic generator monitors the output power in real time. When the material, thickness, shape and other factors of the weldment change and cause the load to change, and then cause the power to deviate from the set value, the power sensor will feed back the signal to the controller, which can automatically adjust the frequency to ensure the consistency of welding quality.

[0013] like Figure 7-8 As shown; Since the lifting seat 304 is vertically slidably connected to the end of the lifting rod 301, the upper and lower ends of the lifting seat 304 are both connected with retaining rings 305 through threads, and two compression springs are sleeved on the lifting seat 304. The two compression springs are respectively located on both sides of the lifting rod 301, and the two compression springs are respectively pressed on the two retaining rings 305. The lifting seat 304 can slide vertically on the lifting rod 301, so that the laser beam spot welding gun 303 can move vertically relative to the lifting rod 301. The two compression springs give elastic force to the two retaining rings 305 respectively, so that the lifting seat 304 and the laser beam spot welding gun 303 can return to their original positions after displacement. When the ultrasonic generator 306 emits ultrasonic waves, since the lifting seat 304 and the laser beam spot welding gun 303 can be vertically displaced, the laser beam spot welding gun 303 is more likely to perform high-frequency vibration under the action of the ultrasonic generator 306, which is more helpful to break the oxide film on the surface of the workpiece.

[0014] Moreover, when the laser beam spot welding gun 303 contacts the part to be spot welded, the laser beam spot welding gun 303 can be pressed toward the part by elastic force, and the laser beam spot welding gun 303 can be displaced relative to the lifting rod 301 to avoid the laser beam spot welding gun 303 pressing too hard on the part and causing damage to the laser beam spot welding gun 303.

[0015] like Figure 7-8 As shown; Since the lifting rod 301 is connected to the telescopic rod 2 308 by screws, and the telescopic rod 2 308 is connected to the pressing plate 307 by screws, the pressing plate 307 is pressed on one of the retaining rings 305. When the telescopic rod 2 308 is extended, the pressing plate 307 can be driven to move, so that the pressing plate 307 is pressed on one of the retaining rings 305, and then the two retaining rings 305, the lifting seat 304 and the laser beam spot welding gun 303 are fixed on the lifting rod 301. In the usage scenario where high-frequency vibration of the laser beam spot welding gun 303 is not required, the laser beam spot welding gun 303 can be fixed on the lifting rod 301 to prevent the laser beam spot welding gun 303 from moving up and down at will.

[0016] like Figure 7-8 and 11-12; Since a T-shaped block 504 is welded to the lower side of the lifting rod 301, a metal column 502 is respectively inserted at both ends of the T-shaped block 504 with a clearance fit, and a semi-ring cover 501 is welded to the front of the two metal columns 502. The laser beam spot welding gun 303 is located between the two semi-ring covers 501, and stop pins 503 are inserted at both ends of the T-shaped block 504. The two stop pins 503 are respectively blocked on the outside of the two metal columns 502, so that the metal column 502 can be easily disassembled from the T-shaped block 504, and then the disassembly of the two semi-ring covers 501 is convenient. The two stop pins 503 can prevent the metal column 502 from falling off the T-shaped block 504. The two semi-ring covers 501 form a complete ring cover, which can cover the laser beam spot welding gun 303 on all sides. During spot welding, the spatter during welding is blocked to prevent the spatter during welding from splashing everywhere. After the stop pin 503 is removed, the metal column 502 and the semi-ring cover 501 can be removed from the T-shaped block 504, thereby facilitating the cleaning of the semi-ring cover 501.

[0017] In addition, the ring cover is covered around the laser beam spot welding gun 303 to block the emitted light during spot welding to prevent the high-brightness light emitted by spot welding from damaging eyes.

[0018] like Figure 7-8 and 11-12; Since the lower side of the lifting rod 301 is connected with the electromagnet 302 by screws, the electromagnet 302 contacts the upper side of the two metal pillars 502. After the electromagnet 302 is energized, the two metal pillars 502 have magnetism, and the two metal pillars 502 are connected with the two half ring covers 501, so that the two half ring covers 501 also have magnetism, and the spatters during spot welding are adsorbed by magnetism and the spatters generated are quickly collected.

[0019] like Figure 4-5 and 7-8; Since the metal intelligent spot welding equipment also includes a flat plate 101, a strip hole 102 is set on the flat plate 101, support legs 103 are connected to the four corners of the lower side of the flat plate 101 by screws, the lower side of the flat plate 101 is connected to a track frame 107 by screws, a slide 105 is connected to the track frame 107 by transverse sliding, a convex piece 111 is fixed to the lower side of the slide 105, a pad 104 is welded to the left and right ends of the upper side of the slide 105, and the pad 104 is set at the strip hole 102, a motor frame 108 is connected to the motor frame 108 by screws, a motor 109 is connected to the output shaft of the motor 109 by a coupling, and a screw rod 110 is connected to the output shaft of the motor 109 by a coupling. 110 cooperates with the nut fixed on the protruding piece 111; the laser beam spot welding gun 303 is arranged above the flat plate 101, and the laser beam spot welding gun 303 is located in the center between the two pads 104. The flat plate 101 can provide a placement platform for the two metal plates to be welded, so that the two metal plates are placed on the upper side of the flat plate 101, and the edges of the two metal plates are pressed against each other, and the pressing position is placed at the strip hole 102. The strip hole 102 is arranged so that the pressing position of the two metal plates is suspended, and then the welding point position of the two metal plates is suspended, so as to prevent the laser beam spot welding gun 303 from welding the two metal plates together with the flat plate 101 during spot welding, thereby avoiding damage to the flat plate 101; The two pads 104 are always supported on the lower sides of the two metal plates, so that the two metal plates are supported during welding and are not easily deformed. The motor 109 can drive the motor frame 108 to rotate, and then drive the slide 105 to move left and right on the track frame 107. At this time, the two pads 104 will also move with the slide 105, and then change the two pads 104 to support different positions of the pressed part of the two metal plates, and spot weld different positions of the pressed part of the two metal plates.

[0020] like Figure 4-8 As shown; Since the end of the lifting rod 301 is vertically slidably connected to the L-shaped frame 201, the L-shaped frame 201 is connected to the telescopic rod 1 202 by screws, the end of the telescopic rod 1 202 is connected to the lifting rod 301 by screws, and the lower end of the L-shaped frame 201 is welded to the lower end of the protruding piece 111. When the slide seat 105 moves left and right, the L-shaped frame 201 will move left and right, and then the lifting rod 301, the lifting seat 304 and the laser beam spot welding gun 303 move left and right, so that the laser beam spot welding gun 303 is located in the center between the two pads 104, ensuring that both sides of the welding point of the laser beam spot welding gun 303 are supported when welding, preventing the welding points of the two metal plates from being unsupported when welding with the laser beam spot welding gun 303, so that the two metal plates are placed more stably during welding, and the welding effect is improved.

[0021] like Figure 4-5 and 9-10; Since the front and rear ends of the lower side of the flat plate 101 are provided with slide rails 106, two pressure rods 401 are arranged left and right, a handle 402 is welded on the upper side of the pressure rod 401, the front and rear ends of the lower side of the pressure rod 401 are connected with a round rod 405 by threads, and the left and right ends of each slide rail 106 are slidably connected with a slider 403, and the two round rods 405 on the same pressure rod 401 are respectively vertically slidably connected to the two sliders 403 on the same side, and the lower end of each round rod 405 is connected with a round piece 404 by screws, and each round rod 405 is sleeved with a compression spring, which is arranged between the corresponding slider 403 and the round piece 404, and a rubber strip 406 is bonded to the lower side of the pressure rod 401, and the slider 403 can slide left and right on the slide rail 106, so that the round rod 405 can slide left and right on the slide rail 106, so that the round rod 405 can slide left and right on the slide rail 106. The left and right positions of the rod 405 can be changed, so that the left and right positions of the pressure rod 401 can be adjusted. The left and right positions of the pressure rod 401 can be changed by pulling the handle 402 by hand. After the two metal plates are placed on the flat plate 101, the handle 402 is released, and the two compression springs respectively give downward force to the two discs 404 and the two round rods 405, so that the pressure rod 401 is pressed on the two metal plates through the rubber strip 406, and the two metal plates are fixed on the flat plate 101. The rubber strip 406 can be elastically deformed. Although there is an overlapping area between the two metal plates, the elastic deformation of the rubber strip 406 can still make the rubber strip 406 press on the two metal plates at the same time, and then fix the two metal plates on the flat plate 101, so as to prevent the two metal plates from shaking during welding and affecting the welding effect.

[0022] like Figure 4-5 , 7-8 and 13-14; Since a lifting beam 607 is vertically slidably connected to one of the supporting legs 103, a threaded hole is provided on the lifting beam 607, and a fastening screw is threadedly connected to the threaded hole, and the fastening screw is pressed on the supporting leg 103, a front plate 601 is welded on the upper side of the lifting beam 607, and a plurality of vertical grooves 603 are evenly distributed on the front plate 601 from left to right, a portal frame 606 is connected to the front side of the front plate 601 by screws, and a plurality of hand rods 605 are provided on the portal frame 606 from left to right, and the plurality of hand rods 605 are slidably connected to the portal frame 606, and filling blocks 602 are welded to the ends of the plurality of hand rods 605, and the plurality of filling blocks 602 correspond to the positions of the plurality of vertical grooves 603 respectively, and an anti-slip strip 604 is bonded to the portal frame 606, and the anti-slip strip 604 contacts the upper sides of the plurality of hand rods 605, and a cylinder 309 is threadedly connected to the end of the lifting rod 301, and the cylinder 309 is arranged above the front plate 601. The cylinder 309 is arranged on the upper side of the front plate 601, so that the cylinder 309 can move left and right on the upper side of the front plate 601. When the cylinder 309 moves to the top of the vertical slot 603, the cylinder 309 can move downward along the corresponding vertical slot 603. At this time, the lifting rod 301 and the laser beam spot welding gun 303 can move downward. At this time, the laser beam spot welding gun 303 can spot weld the pressed position of the two metal plates. The hand lever 605 can move forward and backward on the gantry 606, so that the filling block 602 can be inserted into the corresponding vertical slot 603. , and then fill this vertical groove 603, so that the cylinder 309 cannot move downward in this vertical groove 603, and the anti-slip strip 604 increases the friction when the hand lever 605 slides, so that the hand lever 605 and the filling block 602 can be automatically fixed after moving; this can be achieved by manually opening a specific vertical groove 603 and filling the specific vertical groove 603. At this time, the cylinder 309 can be welded at the corresponding opened vertical groove 603, and then the laser beam spot welding gun 303 can be controlled to perform spot welding on specific positions of the two metal plates.

[0023] Furthermore, in a preferred embodiment, appropriately increasing the number of welding points can increase the connection area between the welds and make the force transmission more uniform, thereby improving the overall connection strength and ensuring that the structure is not easily disengaged when subjected to large external forces.

[0024] Furthermore, in a preferred embodiment, under the premise of ensuring the connection strength, the number of unnecessary welding spots is reduced, which can shorten the welding time and improve the production efficiency.

[0025] Furthermore, in a preferred embodiment, in the connection of components that do not require particularly high strength, by optimizing the number of welds, both the use requirements can be met and the welding cost and production cycle can be reduced. Reducing the number of unnecessary welds shortens the welding time and reduces the operating time of the welding equipment, directly reducing energy consumption and saving energy costs. In addition, a reasonable arrangement of welds can also reduce the cost of repair and rework caused by welding deformation.

[0026] Furthermore, in a preferred embodiment, the number and spacing of welding spots are reasonably distributed, so that the welding heat can be more evenly distributed on the weldment, avoiding excessive deformation caused by local overheating.

[0027] Furthermore, in a preferred embodiment, appropriately increasing the distance between welding spots can reduce the number of arc starting and arc ending during welding and improve the welding speed. At the same time, a larger distance between welding spots also facilitates the operation and movement of welding equipment, further improving production efficiency. However, too large a distance between welding spots may affect the connection strength, which needs to be weighed according to the specific situation.

[0028] Furthermore, in a preferred embodiment, the appropriate number and spacing of the welds can make the welds evenly distributed on the surface of the weldment, forming a neat and regular appearance. In products with high requirements for appearance, uniform and beautiful welds can not only improve the overall quality of the product, but also enhance the market competitiveness of the product.

[0029] Furthermore, in a preferred embodiment, by optimizing the weld point parameters and controlling the number and spacing of weld points, the arc stability during welding can be improved, spatter and welding defects can be reduced, the weld surface can be made smoother and flatter, and the workload of subsequent grinding and processing steps can be reduced.

[0030] A method for spot welding using a metal intelligent spot welding device comprises the following steps: S1: Select two metal plates and carefully check for deformation and crack defects; S2: Place two metal plates on the upper side of the flat plate 101; S3: Press the edges of the two metal plates together, with the pressing position being placed at the strip hole 102; S4: Press the two metal plates simultaneously with two pressing rods 401 to fix the two metal plates on the upper side of the flat plate 101; S5: driving the laser beam spot welding gun 303 to vibrate slightly at a high frequency, and then making the laser beam spot welding gun 303 spot weld at the pressed part of the two metal plates; S6: Multiple welding spots are spot welded at the pressed joint of the two metal plates to spot weld the two metal plates together.

Claims

1. A metal intelligent spot welding device, comprising a laser beam spot welding gun (303), characterized in that: The laser beam spot welding gun (303) is fixed on a lifting seat (304), and an ultrasonic generator (306) is fixed on the lifting seat (304).

2. The metal intelligent spot welding equipment according to claim 1, characterized in that: The lifting seat (304) is vertically slidably connected to the end of the lifting rod (301), and retaining rings (305) are fixed at both upper and lower ends of the lifting seat (304). Two compression springs are sleeved on the lifting seat (304), and the two compression springs are respectively located on both sides of the lifting rod (301), and the two compression springs are respectively pressed on the two retaining rings (305).

3. The metal intelligent spot welding equipment according to claim 2, characterized in that: A second telescopic rod (308) is fixed on the lifting rod (301), a pressing plate (307) is fixed on the second telescopic rod (308), and the pressing plate (307) is pressed on one of the retaining rings (305).

4. The metal intelligent spot welding equipment according to claim 3, characterized in that: A T-shaped block (504) is fixed to the lower side of the lifting rod (301), a metal column (502) is respectively inserted at both ends of the T-shaped block (504), a semi-ring cover (501) is fixed to the front of the two metal columns (502), the laser beam spot welding gun (303) is located between the two semi-ring covers (501), and a stop pin (503) is inserted at both ends of the T-shaped block (504), and the two stop pins (503) are respectively blocked on the outside of the two metal columns (502).

5. The metal intelligent spot welding equipment according to claim 4, characterized in that: An electromagnet (302) is fixed to the lower side of the lifting rod (301), and the electromagnet (302) is in contact with the upper sides of the two metal pillars (502).

6. The metal intelligent spot welding equipment according to claim 5, characterized in that: The device also comprises a flat plate (101), wherein the flat plate (101) is provided with a strip hole (102), support legs (103) are fixed at the four corners of the lower side of the flat plate (101), a track frame (107) is fixed at the lower side of the flat plate (101), a slide seat (105) is slidably connected to the track frame (107) in a transverse direction, a protruding piece (111) is fixed at the lower side of the slide seat (105), and a cushion block (104) is fixed at both left and right ends of the upper side of the slide seat (105), and the cushion block (104) A motor frame (108) is fixed on the lower side of the plate (101) at the strip hole (102), a motor (109) is fixed on the motor frame (108), a screw rod (110) is fixed on the output shaft of the motor (109), and the screw rod (110) cooperates with a nut fixed on the protruding piece (111); a laser beam spot welding gun (303) is arranged above the plate (101), and the laser beam spot welding gun (303) is located at a central position between the two cushion blocks (104).

7. The metal intelligent spot welding equipment according to claim 6, characterized in that: The end of the lifting rod (301) is vertically slidably connected to the L-shaped frame (201), a telescopic rod 1 (202) is fixed to the L-shaped frame (201), the end of the telescopic rod 1 (202) is fixed to the lifting rod (301), and the lower end of the L-shaped frame (201) is fixed to the lower end of the protruding piece (111).

8. The metal intelligent spot welding equipment according to claim 7, characterized in that: The front and rear ends of the lower side of the flat plate (101) are both provided with a slide rail (106), two pressure rods (401) are arranged on the left and right, a handle (402) is fixed on the upper side of the pressure rod (401), a round rod (405) is fixed on the front and rear ends of the lower side of the pressure rod (401), the left and right ends of each slide rail (106) are slidably connected to a slider (403), the two round rods (405) on the same pressure rod (401) are respectively vertically slidably connected to the two sliders (403) on the same side, a round plate (404) is fixed on the lower end of each round rod (405), each round rod (405) is sleeved with a compression spring, the compression spring is arranged between the corresponding slider (403) and the round plate (404), and a rubber strip (406) is bonded to the lower side of the pressure rod (401).

9. The metal intelligent spot welding equipment according to claim 8, characterized in that: A lifting beam (607) is vertically slidably connected to one of the support legs (103), the lifting beam (607) is provided with a threaded hole, a fastening screw is threadedly connected to the threaded hole, and the fastening screw is pressed on the support leg (103), a front plate (601) is fixed on the upper side of the lifting beam (607), a plurality of vertical grooves (603) are evenly distributed on the front plate (601) from left to right, a portal frame (606) is fixed on the front side of the front plate (601), and a plurality of hand levers (603) are arranged on the portal frame (606) from left to right 5), multiple hand bars (605) are slidably connected to the door frame (606), and filling blocks (602) are fixed to the ends of the multiple hand bars (605), and the multiple filling blocks (602) correspond to the positions of the multiple vertical grooves (603) respectively. An anti-slip strip (604) is bonded to the door frame (606), and the anti-slip strip (604) is in contact with the upper sides of the multiple hand bars (605). A cylinder (309) is fixed to the end of the lifting rod (301), and the cylinder (309) is arranged above the front plate (601).

10. A method for spot welding using the metal intelligent spot welding device according to claim 9, characterized in that: The following steps are involved: S1: Select two metal plates and carefully check for deformation and crack defects; S2: placing two metal plates on the upper side of the flat plate (101); S3: Pressing the edges of the two metal plates together, with the pressing position being placed at the strip hole (102); S4: Pressing the two metal plates simultaneously with two pressing rods (401) to fix the two metal plates on the upper side of the flat plate (101); S5: driving the laser beam spot welding gun (303) to vibrate slightly at a high frequency, and then causing the laser beam spot welding gun (303) to spot weld at the pressed part of the two metal plates; S6: Multiple welding spots are spot welded at the pressed joint of the two metal plates to spot weld the two metal plates together.

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