Laser welding method and apparatus

Abstract

The application provides a laser welding method for welding an elastic component, comprising the following steps: dividing the elastic component into five welding areas in a welding sequence, wherein the five welding areas are a first area near one side of a short side of the elastic component, a second area symmetrically and spacedly arranged with the first area, a third area at the center of the elastic component, a fourth area symmetrically arranged with the first area and the second area respectively and adjacent to the first area and the second area respectively, and a fifth area adjacent to the first area and the second area respectively and located on a frame member. The fifth area comprises four areas, namely a fifth A area, a fifth B area, a fifth C area and a fifth D area. The application also provides a welding device for the laser welding method. The laser welding method and the device can effectively improve the production efficiency and the welding precision, reduce the loss of waste products and save the production cost.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a laser welding method and apparatus. Background Technology

[0002] The product to be welded in this invention is the built-in elastic component of the touch keys of a laptop keyboard. The plane of this elastic component needs to have a certain regular curvature after welding because the product undergoes periodic changes (expansion or contraction) after welding. Pre-deformation of the elastic component can counteract these subsequent periodic changes, thus ensuring the quality of the final product. In existing technology, pre-deformation of the elastic component involves applying high-temperature tape to the corresponding part of the carrier or pressure plate. The high-temperature tape supports the elastic component to maintain the preset curvature. However, in actual production, there are many laser welding production lines for this product, each with multiple carriers. Applying high-temperature tape to each carrier is very time-consuming, severely impacting welding efficiency. Furthermore, because the high-temperature tape needs to be applied manually, the consistency of application is poor, resulting in inconsistent curvature in the final product. Additionally, after applying the high-temperature tape, the gap between the product and the carrier causes uneven pressure on the product, leading to gaps and air bubbles in the final welded product, increasing the scrap rate, raising production costs, and severely impacting production schedule. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a laser welding method and apparatus. This welding method allows the elastic component to be welded to be directly formed into an arc after welding, eliminating the need for the step of attaching high-temperature tape to the carrier in advance, which can effectively improve production efficiency and welding accuracy, reduce scrap loss, and save production costs.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A laser welding method is used to weld an elastic component, the elastic component including a frame member, a thin plate connector, a first nut, and a plurality of second nuts; the thin plate connector is used to connect the first nut and second nuts to the frame member; the laser welding method includes the following steps:

[0006] The thin plate connector is divided into welding areas, which include five areas: a first area near the short side of the frame member, a second area symmetrical to and spaced apart from the first area, a third area located at the center of the thin plate connector, a fourth area adjacent to and symmetrically arranged with respect to the first and second areas, and a fifth area adjacent to the first and second areas and located on the frame member; the first area includes an A area and a B area near the top corner of the frame member, and a C area located between the A area and the B area; the second area includes two A areas symmetrical to the A area, two B areas symmetrical to the B area, and two C areas symmetrical to the C area.

[0007] Laser welding is performed sequentially on the first, second, third, fourth, and fifth regions according to the region division order, and the laser welding method is skip welding;

[0008] The fifth region comprises four areas: area 5A, area 5B, area 5C, and area 5D. Each area has two or more rows of solder joints. Area 5A is adjacent to area 1A, area 5B is adjacent to area 1B, area 5C is adjacent to area 2A, and area 5D is adjacent to area 2B.

[0009] Further improvements to the above technical solution are:

[0010] Laser welding of the fifth region includes: welding a row of weld points in the fifth A region, then welding a row of weld points in the fifth C region, and so on alternately;

[0011] Weld one row of solder joints in area 5B, then weld one row of solder joints in area 5D, and so on alternately.

[0012] Laser welding is performed sequentially on the first, second, third, and fourth regions according to the region division order, specifically including the first welding and the second welding:

[0013] First welding: Skip welding is performed on the first area, and the skip welding method is to weld once every other weld point; skip welding is performed on the second area, the third area and the fourth area in sequence, and the skip welding method is the same as that of the first area.

[0014] Second welding: Skip welding is performed on the remaining weld points in the first area. The skip welding method is still to weld once every other weld point. Skip welding is performed on the second area, the third area and the fourth area in sequence. The skip welding method is the same as that of the first area.

[0015] When performing skip welding on the first area in the first welding process, the following order is followed: Area A, Area B, and Area C. The welding point of Area A, which is close to the top corner of the frame component, is taken as the starting point for welding Area A. The welding point of Area B, which is close to the top corner of the frame component, is taken as the starting point for welding Area B. The welding point of Area C, which is close to the short side of the frame component and close to Area A, is taken as the starting point for welding Area C.

[0016] When performing skip welding on the second region during the first welding process, the welding is performed in the following order: region A, region B, and region C. The weld point in region A that is close to the top corner of the frame component is taken as the starting point for welding in region A. The weld point in region B that is close to the top corner of the frame component is taken as the starting point for welding in region B. The weld point in region C that is close to the short side of the frame component and close to region A is taken as the starting point for welding in region C.

[0017] Laser welding of the fourth region is performed in the following order: the fourth region adjacent to region A, the fourth region adjacent to region B, the fourth region adjacent to region A, and the fourth region adjacent to region B.

[0018] The present invention also provides a laser welding apparatus for the above-described laser welding method, the laser welding apparatus comprising:

[0019] A carrier for placing the elastic component, a pressure plate for pressing the elastic component onto the carrier, a nitrogen hood for discharging the welding atmosphere, and a protective glass plate covering the nitrogen hood; the nitrogen hood, carrier, and protective glass plate together form a cavity.

[0020] Furthermore, the inner wall of the nitrogen hood is provided with a discharge groove, which is used to discharge nitrogen into the cavity.

[0021] Furthermore, it also includes two cylinder clamping devices disposed above the vehicle, which are respectively disposed above the two short sides of the frame member on which the vehicle is mounted.

[0022] Furthermore, there are three pressure plates: a first pressure plate, a second pressure plate, and a third pressure plate. The first pressure plate is used for the first welding, the second pressure plate is used for the second welding, and the third pressure plate is used for welding in the fifth region.

[0023] Furthermore, the carrier is provided with two protruding mounting blocks and multiple positioning blocks, and the distance between the mounting blocks and the distance between the positioning blocks are respectively matched with the size of the elastic component.

[0024] According to the technical solution of the present invention, the laser welding method of the present invention, through the reasonable division of the welding area and the reasonable setting of the welding method and welding starting point, can effectively control the deformation degree of the elastic component, so that the curvature of the elastic component meets the design requirements. This eliminates the need for the step of applying high-temperature tape in the prior art, greatly improving production efficiency, welding precision, product consistency, reducing scrap rate, and lowering production costs. The laser welding device of the present invention can accurately position the elastic component. Its structure is simple, and the cavity is filled with nitrogen to prevent oxidation during welding. The protective glass plate is transparent, allowing the laser to pass through it for welding. The nitrogen gas cover and the protective glass plate provide protection, ensuring the safety and reliability of the welding process. Attached Figure Description

[0025] Figure 1 This is a schematic flowchart of the laser welding method according to an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of the welding area division in the laser welding method according to an embodiment of the present invention.

[0027] Figure 3 This is an exploded structural diagram of the elastic component according to an embodiment of the present invention.

[0028] Figure 4 This is a schematic diagram of the carrier structure of the laser welding device according to an embodiment of the present invention.

[0029] Figure 5 This is a schematic diagram of the structure of a pressure plate in the laser welding apparatus of this invention.

[0030] Figure 6 This is a schematic diagram of the welding sequence in the fifth region of the laser welding method according to an embodiment of the present invention.

[0031] The meanings of the labels in the attached diagram are as follows:

[0032] 10-Elastic component; 20-Carrier; 30-Pressure plate; 11-Frame piece; 12-Wing plate; 13-Thin plate connector; 131-Middle part; 132-Wing part; 133-End part; 134-Nested part; 14-First nut; 15-Second nut; 16-Weld point; 17-Inner frame; 1601-Area A; 1602-Area B; 1603-Area C; 1604-Area A II; 1605-Area B II; 1606-Area C II; 1607-Third area; 1608-Fourth area; 1609-Area A VI; 1610-Area C VI; 1611-Area B VI; 1612-Area D VI; 21-Mounting block; 22-Positioning block; 31-Welding window; 32-Mounting port; 33-Positioning port. Detailed Implementation

[0033] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0035] Example 1: As Figure 1 As shown, the laser welding method of this embodiment is used to weld the elastic component 10.

[0036] like Figure 2 and Figure 3 As shown, the elastic component 10 is a built-in elastic mechanism for a laptop keyboard touchpad, including a frame 11, an inner frame 17, a wing plate 12, a first nut 14, a second nut 15, and a thin plate connector 13 that connects the frame 11, inner frame 17, wing plate 12, first nut 14, and second nut 15 into a whole by welding. The thin plate connector 13 includes a middle portion 131 corresponding to the inner frame 17 and the first nut 14, two wings 132 covering the wing plate 12 on both sides laterally, end portions 133 extending laterally from the two wings 132 to the frame 11, and nesting portions 134 extending laterally from opposite sides of the two wings 132 corresponding to a plurality of second nuts 15. The thin plate connector 13 is an integral structure, and a plurality of weld points 16 are provided on the thin plate connector 13 and the frame 11, inner frame 17, wing plate 12, first nut 14, and second nut 15, with the number of weld points 16 exceeding one hundred. The thin plate connector 13 is located on the top layer of the entire elastic component 10 and is used to weld and fix the first nut 14, the second nut 15 and the frame component 11. The frame component 11 is rectangular in shape, including two short sides and two long sides, as well as four vertices that connect the short sides and the long sides respectively.

[0037] like Figure 1 As shown, the laser welding method includes the following steps:

[0038] S1. The thin plate connector 13 is divided into welding areas. The divided welding areas include five areas: a first area near one short side of the frame member 11, a second area symmetrical to the first area and spaced apart, a third area 1607 located at the center of the thin plate connector 13, a fourth area 1608 adjacent to the first area and the second area and symmetrically arranged, and a fifth area adjacent to the first area and the second area and located on the frame member 11; the first area includes an A area 1601 and a B area 1602 near the top corner of the frame member 11, and a C area 1603 located between the A area 1601 and the B area 1602; the second area includes two A areas 1604 symmetrical to the A area 1601, two B areas 1605 symmetrical to the B area 1602, and two C areas 1606 symmetrical to the C area 1603.

[0039] In this embodiment, taking the direction shown in the figure as an example, the first A area 1601, the first B area 1602, the second A area 1604, and the second B area 1605 correspond to the upper left, lower left, upper right, and lower right of the two wings 132, respectively.

[0040] The third region 1607 is used to weld the first nut 14, the fourth region 1608 is used to weld the second nut 15, and the fifth region is used to weld the end 133, so that the frame piece 11 is fixedly connected to the thin plate connector 13.

[0041] S2. Sequential welding: Laser welding is performed on the first region, the second region, the third region 1607, the fourth region 1608, and the fifth region in the order of region division. The laser welding method is skip welding.

[0042] Firstly, welding is performed on the first region, the second region, the third region 1607, and the fourth region 1608, specifically including the first welding and the second welding:

[0043] First welding: Skip welding is performed on the first area, and the skip welding method is to weld once every other weld point 16; skip welding is performed on the second area, the third area 1607 and the fourth area 1608 in sequence, and the skip welding method is the same as that of the first area.

[0044] In this embodiment, during the first welding, area A 1601 of the first region is welded first, followed by areas B 1602 and C 1603. When welding area A 1601, the first weld point 16 located at the upper left corner of the wing 132 is used as the starting point for welding area A 1601, and skip welding is performed on area A 1601 in a left-to-right, top-to-bottom order, that is, welding is performed once every other point. The first weld point 16 located at the lower left corner of the wing 132 is used as the starting point for welding area B 1602, and skip welding is performed on area B 1602 in a left-to-right, bottom-to-top order. The first weld point 16 of area C 1603, located near the end 133 and at the upper left corner, is used as the starting point for welding area C 1603, and skip welding is performed on area C 1603 in a left-to-right, top-to-bottom order.

[0045] Next, weld the second region, including area A 1604, area B 1605, and area C 1606. When welding area A 1604, use the first weld point 16 located at the upper right corner of the wing 132 as the starting point for welding area A 1604, and perform skip welding on area A 1604 in a right-to-left, top-to-bottom order, welding once at each skipped point. Use the first weld point 16 located at the lower right corner of the wing 132 as the starting point for welding area B 1605, and perform skip welding on area B 1605 in a right-to-left, bottom-to-top order. Use the first weld point 16 located at the upper right corner of area C 1606, close to the end 133, as the starting point for welding area C 1606, and perform skip welding on area C 1606 in a right-to-left, top-to-bottom order. In other words, the welding sequence of the second region is a mirror image of the welding sequence of the first region.

[0046] When welding the third region 1607, take the weld point 16 located in the upper left corner as the starting point for welding, and weld from left to right and from top to bottom. When welding the fourth region 1608, first weld the second nut 15 adjacent to region A 1601, then weld the second nut 15 adjacent to region B 1602, the second nut 15 adjacent to region A 1604, and the second nut 15 adjacent to region B 1605 in sequence.

[0047] Second welding: Skip welding is performed on the remaining solder joints 16 in the first region. The skip welding method is still to weld once every other solder joint 16. Skip welding is performed on the second region, the third region 1607 and the fourth region 1608 in sequence. The skip welding method is the same as that of the first region.

[0048] The second welding operation involves welding all remaining weld points 16 in the first, second, third (1607), and fourth (1608) regions, thus completing the welding work in these regions. The welding sequence is the same as that of the first welding operation. For each region, the welding is performed in the same order as the first welding operation. That is, the starting point of each region's welding is located at the next weld point 16 adjacent to the starting point of the first welding operation. After that, welding is performed once for every weld point 16 that has been welded in the first welding operation, with the welding method and order being the same as the first welding operation.

[0049] Using skip welding can effectively avoid stress concentration during laser welding and reduce the deformation of the elastic component 10.

[0050] After welding the first, second, third (1607), and fourth (1608) regions, welding of the fifth region is performed. This fifth region comprises four areas: 5A (1609), 5B (1611), 5C (1610), and 5D (1612). Each area has at least two rows of weld points 16. 5A (1609) is adjacent to 1A (1601), 5B (1611) is adjacent to 1B (1602), 5C (1610) is adjacent to 2A (1604), and 5D (1612) is adjacent to 2B (1605). 5A (1609) and 5C (1610) are welded alternately; 5B (1611) and 5D (1612) are welded alternately.

[0051] In this embodiment, the fifth region is located on end 133. Each of the four end 133 has two rows of solder points 16, with each row including five solder points. Each row of solder points 16 is arranged parallel to the short side of the frame member 11. Regions A 1609 and C 1610 are both located in the upper part as shown in the figure, and are respectively located on the left and right sides of the elastic component 10. Regions B 1611 and D 1612 are both located in the lower part as shown in the figure, and are respectively located on the left and right sides of the elastic component 10. The alternating welding of areas 1609 (A5) and 1610 (C5) means first arbitrarily selecting either area 1609 or 1610 as the welding starting point. For example, if area 1610 is chosen as the starting point, first weld one row of weld points 16 in area 1610 continuously, then weld one row of weld points 16 in area 1609 continuously, then weld another row of weld points 16 in area 1610, and finally weld another row of weld points 16 in area 1609. Alternatively, one could first weld one row of five weld points 16 in area 1609, then weld one row of five weld points 16 in area 1610, then weld another row of five weld points 16 in area 1609, and finally weld one row of five weld points 16 in area 1610. The alternating welding of areas 1611 (B5) and 1612 (D5) is performed in the same way and will not be described further.

[0052] Figure 6 The welding sequence diagram for the fifth area is divided into two parts according to the vertical direction shown in the diagram. Welding of the upper area 5A 1609 and 5C 1610 can be carried out first, or welding of the lower area 5B 1611 and 5D 1612 can be carried out first. The welding sequence is in the order of numbers in the diagram.

[0053] For example, such as Figure 6 As shown in section A, first solder the row of solder points 16 slightly to the left of area A 1609, soldering from bottom to top; then solder the row of solder points 16 slightly to the left of area C 1610, soldering from top to bottom; then solder the row of solder points 16 slightly to the right of area A 1609, soldering from bottom to top; then solder the row of solder points 16 slightly to the right of area C 1610, soldering from top to bottom. Next, solder the row of solder points 16 slightly to the left of area D 1612, soldering from bottom to top; then solder the row of solder points 16 slightly to the right of area B 1611, soldering from top to bottom; then solder the row of solder points 16 slightly to the right of area D 1612, soldering from bottom to top; finally, solder the row of solder points 16 slightly to the left of area B 1611, soldering from top to bottom.

[0054] For example, such as Figure 6As shown in section B, first solder the row of solder points 16 to the left of 1609 in area A, soldering from top to bottom; then solder the row of solder points 16 to the right of 1610 in area C, soldering from bottom to top; then solder the row of solder points 16 to the right of 1609 in area A, soldering from top to bottom; then solder the row of solder points 16 to the left of 1610 in area C, soldering from bottom to top. Next, solder the row of solder points 16 to the right of 1612 in area D, soldering from bottom to top; then solder the row of solder points 16 to the left of 1611 in area B, soldering from top to bottom; then solder the row of solder points 16 to the left of 1612 in area D, soldering from bottom to top; finally, solder the row of solder points 16 to the right of 1611 in area B, soldering from top to bottom.

[0055] For example, such as Figure 6 As shown in C, first solder the row of solder points 16 slightly to the right of 1609 in area A, soldering from bottom to top; then solder the row of solder points 16 slightly to the left of 1610 in area C, soldering from bottom to top; then solder the row of solder points 16 slightly to the left of 1609 in area A, soldering from bottom to top; then solder the row of solder points 16 slightly to the right of 1610 in area C, soldering from bottom to top. Next, solder the row of solder points 16 slightly to the left of 1612 in area D, soldering from bottom to top; then solder the row of solder points 16 slightly to the right of 1611 in area B, soldering from top to bottom; then solder the row of solder points 16 slightly to the right of 1612 in area D, soldering from bottom to top; finally, solder the row of solder points 16 slightly to the left of 1611 in area B, soldering from top to bottom.

[0056] For example, such as Figure 6 As shown in D, first solder the row of solder points 16 slightly to the right of 1609 in area A, soldering from bottom to top; then solder the row of solder points 16 slightly to the left of 1610 in area C, soldering from top to bottom; then solder the row of solder points 16 slightly to the left of 1609 in area A, soldering from top to bottom; then solder the row of solder points 16 slightly to the right of 1610 in area C, soldering from top to bottom. Next, solder the row of solder points 16 slightly to the left of 1612 in area D, soldering from top to bottom; then solder the row of solder points 16 slightly to the right of 1611 in area B, soldering from top to bottom; then solder the row of solder points 16 slightly to the right of 1612 in area D, soldering from bottom to top; finally, solder the row of solder points 16 slightly to the left of 1611 in area B, soldering from top to bottom.

[0057] like Figure 4 and Figure 5As shown, this embodiment also provides a laser welding apparatus for the above-described laser welding method, including a carrier 20 for placing the elastic component 10, a pressure plate 30 for pressing the elastic component 10 onto the carrier 20, a nitrogen hood (not shown in the figure) for discharging welding atmosphere, and a protective glass plate (not shown in the figure) covering the nitrogen hood; the nitrogen hood, the carrier 20 and the protective glass plate together form a cavity.

[0058] The inner wall of the nitrogen hood is provided with a discharge groove, which is used to discharge nitrogen into the cavity.

[0059] The carrier 20 is provided with a cylinder clamping device (not shown in the figure) above it. There are two cylinder clamping devices, which are respectively located above the two short sides of the carrier 20 where the frame piece 11 is installed.

[0060] The carrier 20 is provided with two protruding mounting blocks 21 and a plurality of positioning blocks 22. The distance between the mounting blocks 21 and the distance between the positioning blocks 22 are respectively matched with the size of the elastic component 10.

[0061] There are three pressure plates 30: a first pressure plate, a second pressure plate, and a third pressure plate. The first pressure plate is used for the first welding and has a corresponding welding window 31 through which the laser welds the elastic component 10. The second pressure plate is used for the second welding, and the third pressure plate is used for welding the fifth region. Both the second and third pressure plates have corresponding welding windows 31. The pressure plates 30 also have mounting openings 32 corresponding to the mounting block 21 and positioning openings 33 corresponding to the positioning block 22. The mounting openings 32 and positioning openings 33 are used to position and install the pressure plates 30 onto the carrier 20.

[0062] The laser welding device in this embodiment has a very simple structure. Its carrier is equipped with a positioning block 22, which enables precise positioning of the workpiece, thus improving the accuracy of laser welding. Meanwhile, the protective glass plate and nitrogen hood effectively ensure the safety of laser welding while allowing it to proceed normally.

[0063] The above-mentioned alternating welding method can avoid excessive stress concentration during welding, and at the same time, it can make the elastic component present a preset arc after welding, thereby providing pre-deformation for the periodic changes in the later stage of welding, so that the product can ultimately meet the technical requirements.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The welding method and welding apparatus of this invention enable the elastic component to form a preset arc after welding, thereby resisting the periodic deformation of the welded part in the later stage. It eliminates the step of pasting high-temperature tape in the prior art, improves the production efficiency of welding, improves the consistency of welded products, controls the deformation of the product within a preset range, reduces the labor intensity of workers, and reduces the scrap rate and production cost of products.

[0066] The above embodiments merely illustrate preferred implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention should be determined by the appended claims.

Claims

1. A laser welding method for welding a resilient assembly, the resilient assembly comprising a frame member, a sheet connecting member, a first nut, and a plurality of second nuts; the sheet connecting member being used to connect the first nut and the second nuts with the frame member; characterized in that, The laser welding method comprises the following steps: The welding area of the sheet connector is divided, and the divided welding area comprises five areas, which are a first area near one side of the short side of the frame member, a second area symmetrically and spaced apart from the first area, a third area at the center of the sheet connector, a fourth area symmetrically and adjacent to the first area and the second area, and a fifth area symmetrically and adjacent to the first area and the second area and located on the frame member; the first area comprises an A area and a B area near the top corners of the frame member, and a C area between the A area and the B area; the second area comprises a two-A area symmetric to the A area, a two-B area symmetric to the B area, and a two-C area symmetric to the C area; The first area, the second area, the third area, the fourth area and the fifth area are sequentially laser welded in the order of area division, and the laser welding mode is skip welding; The fifth area comprises four areas, namely a five-A area, a five-B area, a five-C area and a five-D area, and each area has two or more rows of welding points; the five-A area is adjacent to the A area, the five-B area is adjacent to the B area, the five-C area is adjacent to the two-A area, and the five-D area is adjacent to the two-B area.

2. The laser welding method according to claim 1, characterized in that, The laser welding of the fifth area comprises welding one row of welding points of the five-A area, then welding one row of welding points of the five-C area, and repeating the above alternately; Welding one row of welding points of the five-B area, then welding one row of welding points of the five-D area, and repeating the above alternately.

3. The laser welding method of claim 1, wherein: The first area, the second area, the third area and the fourth area are sequentially laser welded in the order of area division, and the laser welding mode is skip welding. The first welding: the first area is skip welded, and the welding is performed once every other welding point; the second area, the third area and the fourth area are sequentially skip welded, and the welding mode is the same as that of the first area; The second welding: the remaining welding points of the first area are skip welded, and the welding is performed once every other welding point; the second area, the third area and the fourth area are sequentially skip welded, and the welding mode is the same as that of the first area.

4. The laser welding method of claim 3, wherein: In the first welding, the first area is skip welded in the following order: the A area, the B area and the C area, the welding point of the A area near the corresponding top corner of the frame member is taken as the starting point of the welding of the A area, the welding point of the B area near the corresponding top corner of the frame member is taken as the starting point of the welding of the B area, and the welding point of the C area near the short side of the frame member and near the A area is taken as the starting point of the welding of the C area. The second region is welded in the following order: the second A region, the second B region, and the second C region, the welding spot of the second A region close to the corresponding top corner of the frame member is taken as the starting point of the second A region welding, the welding spot of the second B region close to the corresponding top corner of the frame member is taken as the starting point of the second B region welding, and the welding spot of the second C region close to the short side of the frame member and close to the second A region is taken as the starting point of the second C region welding.

5. The laser welding method of claim 1, wherein: The laser welding of the fourth region is performed in the following order: the fourth region adjacent to the first A region, the fourth region adjacent to the first B region, the fourth region adjacent to the second A region, and the fourth region adjacent to the second B region.

6. The laser welding method according to any one of claims 1 to 5, characterized in that: The laser welding method is implemented by using a laser welding device, and the laser welding device comprises: A carrier for placing the elastic assembly, a pressing plate for pressing the elastic assembly on the carrier, a nitrogen cover for discharging the welding atmosphere, and a protective glass plate arranged on the nitrogen cover; the nitrogen cover, the carrier and the protective glass plate jointly form a cavity, and a discharge groove is arranged on the inner wall of the nitrogen cover, which is used for discharging nitrogen into the cavity.

7. The laser welding method of claim 6, wherein: The laser welding device further comprises a pneumatic cylinder pressing device arranged above the carrier, and the number of the pneumatic cylinder pressing devices is two, which are arranged above the two short sides of the frame member installed on the carrier.

8. The laser welding method of claim 6, wherein: The number of the pressing plates is three, which are a first pressing plate, a second pressing plate and a third pressing plate, the first pressing plate is used for first welding, the second pressing plate is used for second welding, and the third pressing plate is used for welding of the fifth region.

9. The laser welding method of claim 6, wherein: Two protruding mounting blocks and a plurality of positioning blocks are arranged on the carrier, and the distance between the mounting blocks and the distance between the positioning blocks are matched with the size of the elastic assembly respectively.

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