Metal intelligent spot welding device and spot welding method

Abstract

The present application relates to the field of intelligent welding system, more particularly to a metal intelligent spot welding device and a spot welding method.A metal intelligent spot welding device, comprising a laser beam spot welding gun, the laser beam spot welding gun is fixed on a lifting seat, and an ultrasonic generator is fixed on the lifting seat.A metal intelligent spot welding device is used to carry out the method of spot welding, comprising the following steps: S1: selecting two metal plates and carefully checking whether there are deformation and crack defects;S2: placing the two metal plates on the upper side of the flat plate;S3: making the edges of the two metal plates press together, and the pressing position is placed at the strip hole;S4: fixing the two metal plates on the upper side of the flat plate by pressing the two metal plates on the two pressing rods at the same time;S5: driving the laser beam spot welding gun to vibrate slightly at high frequency, and then making the laser beam spot welding gun spot welding at the pressing position of the two metal plates;S6: spot welding multiple welding points at the pressing position of the two metal plates, and spot welding the two metal plates together.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of intelligent welding system, more particularly to a metal intelligent spot welding device and a spot welding method. BACKGROUND

[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, the traditional spot welding equipment has certain limitations in process implementation. In 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 combination between metal atoms, thereby affecting the welding quality. The existing spot welding equipment cannot perform high-frequency micro-vibration. During spot welding, high-frequency micro-vibration can have a special effect on the surface of the workpiece. Through high-frequency fine impact, it helps to break the oxide film on the surface of the workpiece, making the contact between metal atoms more close, thereby significantly enhancing the bonding strength of welding. However, the existing technology cannot realize this key function. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the present application 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 welding.

[0004] A metal intelligent spot welding device, comprising a laser beam spot welding gun, 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 slidingly connected to the end of the lifting rod, and the upper and lower ends of the lifting seat are both fixed with a blocking ring. Two compression springs are sleeved on the lifting seat, and the two compression springs are respectively located on the two sides of the lifting rod and are respectively pressed on the two blocking rings.

[0006] The lifting rod is fixed with an extension rod II, and the extension rod II is fixed with a pressing piece, which is pressed on one of the blocking rings.

[0007] The lower side of the lifting rod is fixed with a T-shaped block, and the two ends of the T-shaped block are respectively inserted with a metal column. The front part of the two metal columns is respectively fixed with a half ring cover, and the laser beam spot welding gun is located between the two half ring covers. The two ends of the T-shaped block are respectively inserted with a blocking pin, and the two blocking pins are respectively blocked on the outer sides of the two metal columns.

[0008] A metal intelligent spot welding device is used to perform a spot welding method, comprising the following steps:

[0009] S1: selecting two metal plates and carefully checking for deformation and crack defects;

[0010] S2: Place the two metal plates on the upper side of the flat plate;

[0011] S3: Press the edges of the two metal plates to each other, and the pressing position is placed at the strip hole;

[0012] S4: Fix the two metal plates on the upper side of the flat plate by pressing the two metal plates with two pressing rods at the same time;

[0013] S5: Drive the laser beam spot welding gun to vibrate slightly at high frequency, and then make the laser beam spot welding gun spot weld at the pressing position of the two metal plates;

[0014] S6: Spot weld multiple welding points at the pressing position of the two metal plates, and spot weld the two metal plates together. BRIEF DESCRIPTION OF DRAWINGS

[0015] The application will be further described in detail below in combination with the drawings and specific implementation methods.

[0016] Figure 1 Structure diagram of a metal intelligent spot welding device Figure 1 ;

[0017] Figure 2 Structure diagram of a metal intelligent spot welding device Figure 2 ;

[0018] Figure 3 Structure diagram of a metal intelligent spot welding device Figure 3 ;

[0019] Figure 4 Structure diagram of a flat plate Figure 1 ;

[0020] Figure 5 Structure diagram of a flat plate Figure 2 ;

[0021] Figure 6 Structure diagram of an L-shaped frame

[0022] Figure 7 Structure diagram of a lifting rod Figure 1 ;

[0023] Figure 8 Structure diagram of a lifting rod Figure 2 ;

[0024] Figure 9 Structure diagram of a pressing rod Figure 1 ;

[0025] Figure 10 Structure diagram of a pressing rod Figure 2 ;

[0026] Figure 11Structure diagram of half ring cover Figure 1 ;

[0027] Figure 12 Structure diagram of half ring cover Figure 2 ;

[0028] Figure 13 Structure diagram of front plate Figure 1 ;

[0029] Figure 14 Structure diagram of front plate Figure 2 ;

[0030] In the figure: flat plate 101; strip hole 102; support leg 103; cushion block 104; sliding seat 105; sliding rail 106; rail frame 107; motor frame 108; motor 109; screw rod 110; tab 111;

[0031] L-shaped frame 201; telescopic rod 202;

[0032] Lifting rod 301; electromagnet 302; laser beam spot welding gun 303; lifting seat 304; blocking ring 305; ultrasonic generator 306; pressing piece 307; telescopic rod 2 308; cylinder 309;

[0033] Pressing rod 401; handle 402; sliding block 403; round piece 404; round rod 405; rubber strip 406;

[0034] Half ring cover 501; metal column 502; blocking pin 503; T-shaped block 504;

[0035] Front plate 601; filling block 602; vertical groove 603; anti-skid strip 604; hand lever 605; door-shaped frame 606; lifting beam 607. DETAILED DESCRIPTION

[0036] As Figure 7-8 shown;

[0037] Due to the metal intelligent spot welding equipment, including the laser beam spot welding gun 303, the laser beam spot welding gun 303 is connected on the lifting seat 304 through a screw, and the ultrasonic generator 306 is connected on the lifting seat 304 through a screw. The ultrasonic generator 306 emits ultrasonic waves, which drives 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 enhances the bonding strength of the welding; for the workpiece of harder material, increasing the electrode vibration frequency, which helps to break the oxide film on the surface of the workpiece, improves the contact between the electrode and the workpiece, enhances the welding effect, and improves the bonding strength of the welding spot.

[0038] The frequency of the ultrasonic generator 306 emitting ultrasonic waves can also be intelligently adjusted by the prior art. During the welding process, the ultrasonic generator monitors the output power in real time. When the material, thickness, shape, and other factors of the welding part change, causing the load to change and 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 the welding quality.

[0039] As shown in Figure 7-8 ;

[0040] Since the lifting seat 304 is vertically slidingly connected to the end of the lifting rod 301, the upper and lower ends of the lifting seat 304 are both threadedly connected with the retaining rings 305. The lifting seat 304 is sleeved with two compression springs, which are respectively located on the two sides of the lifting rod 301 and press on the two retaining rings 305. The lifting seat 304 can vertically slide on the lifting rod 301, so that the laser beam spot welding gun 303 can vertically move relative to the lifting rod 301. The two compression springs respectively give the two retaining rings 305 elastic force, so that the lifting seat 304 and the laser beam spot welding gun 303 can return to the original position after displacement. When the ultrasonic generator 306 emits ultrasonic waves, the laser beam spot welding gun 303 is more easily subjected to high-frequency vibration under the action of the ultrasonic generator 306 due to the vertical displacement of the lifting seat 304 and the laser beam spot welding gun 303, which is more helpful to break the oxide film on the surface of the workpiece.

[0041] Moreover, when the laser beam spot welding gun 303 contacts the parts to be spot welded, the laser beam spot welding gun 303 can be pressed against the parts by the 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 being damaged due to excessive force pressing on the parts.

[0042] As shown in Figure 7-8 ;

[0043] Since the telescopic rod two 308 is connected to the lifting rod 301 by a screw, and the pressing piece 307 is connected to the telescopic rod two 308 by a screw, the pressing piece 307 presses on one of the retaining rings 305. When the telescopic rod two 308 is elongated, it can drive the pressing piece 307 to move, so that the pressing piece 307 presses on one of the retaining rings 305, thereby fixing the two retaining rings 305, the lifting seat 304, and the laser beam spot welding gun 303 on the lifting rod 301. In use scenarios where the laser beam spot welding gun 303 does not need to be subjected to high-frequency vibration, the laser beam spot welding gun 303 can be fixed on the lifting rod 301 to avoid the laser beam spot welding gun 303 moving up and down at will.

[0044] As shown in Figure 7-8 and 11-12;

[0045] Due to the welding of the T-shaped block 504 on the lower side of the lifting rod 301, the two ends of the T-shaped block 504 are respectively inserted with a metal column 502 in a clearance fit, and the front of the two metal columns 502 is respectively welded with a half ring cover 501, and the laser beam spot welding gun 303 is located between the two half ring covers 501, and the two ends of the T-shaped block 504 are respectively inserted with a stop pin 503, and the two stop pins 503 are respectively blocked on the outer sides of the two metal columns 502, the metal column 502 is convenient to disassemble from the T-shaped block 504, and then the disassembly of the two half ring covers 501 is facilitated, and the two stop pins 503 can prevent the metal column 502 from falling off from the T-shaped block 504, and the two half ring covers 501 form a complete ring cover, which can cover around the laser beam spot welding gun 303, and can block the splashes during spot welding to prevent the splashes during spot welding from flying everywhere. After the stop pin 503 is disassembled, the metal column 502 and the half ring cover 501 can be disassembled from the T-shaped block 504, and then the half ring cover 501 is convenient to clean.

[0046] And the ring cover covers around the laser beam spot welding gun 303, and blocks the light during spot welding to prevent the high-brightness light during spot welding from damaging the eyes.

[0047] As shown in Figure 7-8 and 11-12;

[0048] Due to the screw connection of the electromagnet 302 on the lower side of the lifting rod 301, the electromagnet 302 is in contact with the upper side of the two metal columns 502. After the electromagnet 302 is electrified, the two metal columns 502 have magnetism, and the two metal columns 502 are connected with the two half ring covers 501, so that the two half ring covers 501 also have magnetism, and the splashes during spot welding are adsorbed through magnetism, and the generated splashes are quickly collected.

[0049] As shown in Figure 4-5 and 7-8;

[0050] Since the metal intelligent spot welding device further comprises a flat plate 101, a strip hole 102 is arranged on the flat plate 101, and support legs 103 are connected to the lower side of the flat plate 101 through screws at the four corners, a track frame 107 is connected to the lower side of the flat plate 101 through a screw, a sliding seat 105 is transversely and slidingly connected to the track frame 107, a protruding piece 111 is fixed to the lower side of the sliding seat 105, a pad 104 is welded to the left and right ends of the upper side of the sliding seat 105, the pad 104 is arranged at the strip hole 102, a motor frame 108 is connected to the lower side of the flat plate 101 through a screw, a motor 109 is connected to the motor frame 108 through a screw, a lead screw 110 is connected to the output shaft of the motor 109 through a shaft coupling, and the lead screw 110 is matched with a nut fixed to the protruding piece 111; the laser beam spot welding gun 303 is arranged above the flat plate 101, the laser beam spot welding gun 303 is located at the central position between the two pads 104, and the flat plate 101 can provide a platform for placing the two metal plates to be welded, so that the two metal plates are placed on the upper side of the flat plate 101, the edges of the two metal plates are pressed together, the pressing position is arranged at the strip hole 102, the strip hole 102 is arranged to suspend the pressing position of the two metal plates, so that the welding position of the two metal plates is suspended, and the laser beam spot welding gun 303 is prevented from welding the two metal plates and the flat plate 101 together during spot welding, thereby avoiding damage to the flat plate 101.

[0051] The two pads 104 always support the lower side of the two metal plates, so that the two metal plates are not easily deformed during welding, the motor 109 can drive the motor frame 108 to rotate, thereby driving the sliding seat 105 to move left and right on the track frame 107, at this time, the two pads 104 also move with the sliding seat 105, thereby changing the different positions of the two pads 104 supporting the pressing position of the two metal plates, and spot welding is performed on the different positions of the pressing position of the two metal plates.

[0052] As shown in Figure 4-8 ;

[0053] Since the end of the lifting rod 301 is vertically and slidingly connected to the L-shaped frame 201, the telescopic rod one 202 is connected to the L-shaped frame 201 through a screw, the end of the telescopic rod one 202 is connected to the lifting rod 301 through a screw, and the lower end of the L-shaped frame 201 is welded to the lower end of the protruding piece 111. When the sliding seat 105 moves left and right, the L-shaped frame 201 moves left and right, thereby making 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 at the central position between the two pads 104, ensuring that both sides of the welding point are supported during welding of the laser beam spot welding gun 303, preventing the welding point of the two metal plates from not being supported during welding of 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.

[0054] As shown in Figure 4-5 and 9-10;

[0055] Due to the front and rear ends of the lower side of the flat plate 101 are provided with slide rails 106, two pressing rods 401 are arranged left and right, the upper side of the pressing rod 401 is welded with a handle 402, the front and rear ends of the lower side of the pressing rod 401 are both connected with a round rod 405 through threads, the left and right ends of each slide rail 106 are both connected with a sliding block 403, the two round rods 405 on the same pressing rod 401 are respectively vertically connected with the sliding blocks 403 on the same side, the lower end of each round rod 405 is connected with a round piece 404 through a screw, each round rod 405 is sleeved with a compression spring, the compression spring is arranged between the corresponding sliding block 403 and the round piece 404, the lower side of the pressing rod 401 is bonded with a rubber strip 406, the sliding block 403 can slide left and right on the slide rail 106, so that the left and right positions of the round rod 405 can be changed, and the left and right positions of the pressing rod 401 can be adjusted, the left and right positions of the pressing rod 401 are changed by pulling the handle 402, after the two metal plates are placed on the flat plate 101, the handle 402 is loosened, the two compression springs give the two round pieces 404 and the two round rods 405 downward force, so that the pressing rod 401 is pressed on the two metal plates through the rubber strip 406, and then the two metal plates are fixed on the flat plate 101, the rubber strip 406 can be elastically deformed, although there is a stacking 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 the two metal plates are fixed on the flat plate 101, so as to prevent the two metal plates from shaking and affecting the welding effect during welding.

[0056] As shown in Figure 4-5 , 7-8 and 13-14;

[0057] Since the lifting beam 607 is vertically and slidingly connected to one of the support legs 103, a threaded hole is arranged on the lifting beam 607, a fastening screw is threadedly connected to the threaded hole, the fastening screw is pressed on the support leg 103, the upper side of the lifting beam 607 is welded with the front plate 601, a plurality of vertical grooves 603 are uniformly distributed on the front plate 601 from left to right, the front side of the front plate 601 is connected with the door-shaped frame 606 through screws, a plurality of hand levers 605 are arranged on the door-shaped frame 606 from left to right, the plurality of hand levers 605 are slidingly connected to the door-shaped frame 606, the end of the plurality of hand levers 605 is welded with the filler block 602, the plurality of filler blocks 602 are respectively positionally corresponding to the plurality of vertical grooves 603, the door-shaped frame 606 is bonded with the anti-skid strip 604, the anti-skid strip 604 is in contact with the upper side of the plurality of hand levers 605, the end of the lifting rod 301 is threadedly connected with the cylinder 309, 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 above the vertical groove 603, the cylinder 309 can move downward along the corresponding vertical groove 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 pressing position of the two metal plates, the hand lever 605 can move forward and backward on the door-shaped frame 606, and then the filler block 602 is inserted into the corresponding vertical groove 603, so that the vertical groove 603 is filled, so that the cylinder 309 cannot move downward in the vertical groove 603, and the anti-skid strip 604 increases the friction when the hand lever 605 slides, so that the hand lever 605 and the filler block 602 can be automatically fixed after moving; in this way, a specific vertical groove 603 can be opened and filled by artificial, at this time the cylinder 309 can be welded only in the corresponding opened vertical groove 603, and then the laser beam spot welding gun 303 can spot weld a specific position of the two metal plates.

[0058] Further, in a preferred embodiment, appropriately increasing the number of welding points can increase the connection area between the welding parts and make the force transmission more uniform, thereby improving the overall connection strength and ensuring that the structure is not easily separated when bearing a larger external force.

[0059] Further, in a preferred embodiment, under the premise of ensuring the connection strength, reducing the number of unnecessary welding points can shorten the welding time and improve the production efficiency.

[0060] Further, in a preferred embodiment, in the connection of components with not particularly high strength requirements, by optimizing the number of welding points, both the use requirements can be met and the welding cost and production cycle can be reduced. Reducing the number of unnecessary welding points makes the welding time shorter, and the operation time of the welding equipment is reduced, which directly reduces the energy consumption and saves the energy cost. In addition, reasonable welding point arrangement can also reduce the repair and rework cost caused by welding deformation.

[0061] Further, in a preferred embodiment, reasonable distribution of the number and spacing of welding points can make the welding heat more evenly distributed on the welded part, avoiding excessive deformation caused by local overheating.

[0062] Further, in a preferred embodiment, appropriately increasing the welding point spacing can reduce the number of arc starting and arc ending in the welding process, and improve the welding speed. At the same time, larger welding point spacing also facilitates the operation and movement of the welding equipment, further improving production efficiency. However, too large welding point spacing may affect the connection strength, which needs to be weighed according to the specific situation.

[0063] Further, in a preferred embodiment, appropriate number and spacing of welding points can make the welding points evenly distributed on the surface of the welded part, forming a neat and regular appearance. In products with high appearance requirements, evenly and beautifully arranged welding points not only can improve the overall quality of the product, but also can enhance the market competitiveness of the product.

[0064] Further, in a preferred embodiment, by optimizing the welding point parameters, controlling the number and spacing of welding points can improve the arc stability in the welding process, reduce the generation of spatter and welding defects, make the surface of the welded part smoother, and reduce the workload of subsequent polishing and processing procedures.

[0065] A metal intelligent spot welding device for carrying out spot welding, comprising the following steps:

[0066] S1: selecting two metal plates and carefully checking for deformation and crack defects;

[0067] S2: placing the two metal plates on the upper side of the flat plate 101;

[0068] S3: pressing the edges of the two metal plates against each other, and the pressing position is placed at the strip hole 102;

[0069] S4: fixing the two metal plates on the upper side of the flat plate 101 by pressing the two metal plates with two pressing rods 401 at the same time;

[0070] S5: driving the laser beam spot welding gun 303 to vibrate slightly at high frequency, and then making the laser beam spot welding gun 303 spot weld at the pressing position of the two metal plates;

[0071] S6: Spot welding a plurality of welding spots at the pressing position 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); The lifting seat (304) is vertically slidably connected to the end of the lifting rod (301), and retaining rings (305) are fixed to the 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); The lifting rod (301) is fixed with a second telescopic rod (308), and the second telescopic rod (308) is fixed with a pressing piece (307), and the pressing piece (307) is pressed on one of the retaining rings (305); 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-circular 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-circular 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); 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); The device further comprises a flat plate (101), a strip hole (102) is provided on the flat plate (101), support legs (103) are fixed at the four corners of the lower side of the flat plate (101), a track frame (107) is fixed on the lower side of the flat plate (101), a slide (105) is connected to the track frame (107) in a transverse sliding manner, a protrusion (111) is fixed on the lower side of the slide (105), a pad (104) is fixed on both the left and right ends of the upper side of the slide (105), and the pad (104) A motor frame (108) is fixed to the lower side of the flat plate (101) at the strip hole (102), a motor (109) is fixed to the motor frame (108), a screw rod (110) is fixed to the output shaft of the motor (109), and the screw rod (110) cooperates with a nut fixed to the convex piece (111); a 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).

2. The metal intelligent spot welding device according to claim 1, characterized in that: The end of the lifting rod (301) is vertically slidably connected to the L-shaped frame (201), a telescopic rod (202) is fixed to the L-shaped frame (201), the end of the telescopic rod (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).

3. The metal intelligent spot welding equipment according to claim 2, 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 provided 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 piece (404) is fixed to the lower end of each round rod (405), a compression spring is sleeved on each round rod (405), and the compression spring is provided 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).

4. The metal intelligent spot welding device according to claim 3, characterized in that: A lifting beam (607) is vertically slidably connected to one of the support legs (103), a threaded hole is provided on the lifting beam (607), 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 slots (603) are evenly distributed on the front plate (601) from left to right, a door frame (606) is fixed on the front side of the front plate (601), and a plurality of hand levers (603) are provided on the door frame (606) from left to right. 5), multiple hand rods (605) are slidably connected to the door frame (606), and the ends of the multiple hand rods (605) are fixed with filling blocks (602), and the multiple filling blocks (602) correspond to the positions of the multiple vertical grooves (603) respectively. An anti-slip strip (604) is adhered to the door frame (606), and the anti-slip strip (604) contacts the upper sides of the multiple hand rods (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).

5. A method for spot welding using the metal intelligent spot welding device according to claim 4, characterized in that: The following steps are involved: 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: Pressing the edges of the two metal plates together, with the pressing position being located 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 portion of the two metal plates; S6: Spot weld multiple welding spots at the pressed joint of the two metal plates to spot weld the two metal plates together.

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