Busbar single-sided welding method

Abstract

The present invention relates to a single-sided welding method for busbars, comprising the following steps: first, setting the welding area; and second, welding sequentially. On the one hand, the present invention is based on the insertion and overlapping of the busbar and copper column, and by gradually reducing the assembly cavity segment by segment during welding to allow internal gas to escape through the vent holes, effectively reducing the spatter problem caused by excessively high internal air temperature, and reducing the number of bubbles and cracks in the fusion area of ​​the copper column and busbar, thereby significantly improving welding quality. On the other hand, it achieves one-time welding of the busbar and copper column, which is simple and convenient to operate, has high welding efficiency, and low energy consumption.

Description

[0001] This application is a divisional application of application number 2024114638098, filed on October 21, 2024, entitled "A Single-Sided Segmented Exhaust Plug Welding Process". Technical Field

[0002] This invention belongs to the field of welding technology, specifically relating to a method for single-sided welding of busbars. Background Technology

[0003] Plugs are widely used in electrical installations and are generally made of busbars and copper posts welded together.

[0004] Currently, the existing plug welding process generally involves first machining through holes on the busbar; then inserting copper posts into the through holes, aligning one end of the copper post with one end of the through hole (i.e., the end face of the copper post is flush with the corresponding side surface of the busbar), and the other end protruding from the through hole; next, using a laser welding device, the end face of the copper post is sequentially spliced ​​with the corresponding side surface of the busbar, and the part of the copper post protruding from the through hole is fillet welded with the corresponding side surface of the busbar; finally, the welded plug product is subjected to a thermal shock test to verify the welding quality.

[0005] However, in actual welding processes, existing technologies are prone to the following drawbacks:

[0006] 1. Due to the large gap between the copper pillar and the inner wall of the through hole, cracks and porosity are easily generated during fillet welding or splicing welding. Welding spatter is also a serious problem, which can easily damage the laser welding equipment. In addition, the weld is very likely to break during subsequent thermal shock tests, resulting in a low product yield.

[0007] 2. The process requires two separate steps: splicing welding and fillet welding. This necessitates changing the product's clamping and positioning, as well as adjusting the welding position and angle of the laser welding equipment. The operation is cumbersome, the welding efficiency is low, and it cannot meet production needs. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a novel single-sided welding method for busbars.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0010] A single-sided welding method for busbars, wherein insertion holes and vent holes are formed on the assembly surface and welding surface on both sides of the busbar, respectively; a copper post is inserted into the insertion hole from one end and overlaps with the portion of the busbar from the welding surface to the insertion hole, and an assembly cavity communicating with the vent hole is formed between one end of the copper post and the inner wall of the insertion hole. The welding method includes the following steps:

[0011] First, the welding area is defined, with the projection of the insertion hole on the welding surface as the reference, and includes multiple welds distributed along the chord length direction parallel to any radial direction of the projection. The two ends of any weld are located outside the projection, and the length of the line connecting the middle of the multiple welds is greater than or equal to the diameter of the projection. The welding surface of the busbar is divided into multiple welding areas, and the multiple welds correspond one-to-one with the multiple welding areas. In the orthographic projection of the welding surface of the busbar, the multiple welds are distributed side by side along the line connecting the center of the vent hole and the insertion hole. The multiple welds are defined as the 1st, 2nd, 3rd...Nth welds along the arrangement direction.

[0012] Next, welding is performed sequentially, with the first weld as the reference. Welding is carried out from the first weld to the adjacent welds one by one. During each weld, the assembly cavity is gradually reduced to allow the internal gas to be discharged from the exhaust port, and the exhaust port is covered from the Nth weld.

[0013] Preferably, during welding, welds from the first weld to the (N-1)th weld are performed from either end to the other, and welds from both ends of the Nth weld are performed towards the middle. This step-by-step welding facilitates the removal of gas from the assembly cavity while effectively preventing gas backflow and its formation of bubbles between the lap joint and the end of the copper pillar.

[0014] Specifically, from the first weld to the (N-1)th weld, adjacent welds are welded in opposite directions and remain connected end to end, or adjacent welds are welded in the same direction.

[0015] Preferably, the extension direction of each weld is perpendicular to the arrangement direction of the multiple welds.

[0016] Preferably, each pair of adjacent welds is spliced ​​together or partially overlapped.

[0017] Preferably, the vent is located in the middle of the Nth weld.

[0018] Preferably, laser welding is used during welding. The laser gradually approaches the vent hole from the welding surface of the busbar to form each weld seam, and the vent hole is sealed during the formation of the last weld seam.

[0019] Preferably, the welding method further includes welding quality inspection, which includes thermal shock test and tensile test. In the tensile test, the busbar and copper post are pulled in the opposite direction by a tensile testing machine, and the maximum load that the plug can withstand is recorded.

[0020] Specifically, when the tensile testing machine pulls the busbar and the copper column, the tensile end of the machine maintains a lateral sway, with a sway amplitude of 1.5–2 mm. The purpose of this test is twofold: first, to verify the connection strength between the busbar and the copper column through tensile testing; and second, compared to the traditional static tensile test, this application uses the sway of the tensile force to verify whether the fit between the busbar and the copper column is stable, ensuring the accuracy and reliability of the test results.

[0021] In addition, the two tension ends on the tensile testing machine, corresponding to the busbar and the copper column, have the same or opposite sway directions.

[0022] Due to the implementation of the above technical solutions, the present invention has the following advantages compared with the prior art:

[0023] The existing copper pillars have large gaps between them and the inner walls of the through holes. During fillet welding or splicing welding, cracks and porosity are easily generated, and welding spatter is a serious problem that can easily damage the laser welding equipment. In addition, the weld is very prone to breakage during subsequent thermal shock tests, resulting in a low product yield. Moreover, splicing welding and fillet welding need to be performed in two separate processes, which requires changing the product clamping and positioning, and adjusting the welding position and angle of the laser welding equipment. This operation is cumbersome, the welding efficiency is low, and it cannot meet production needs. This application provides a comprehensive design for a single-sided busbar welding method, cleverly addressing the shortcomings and defects of existing technologies. This welding method first defines a welding area, using the projection of the insertion hole onto the welding surface as a reference, and includes multiple welds distributed along a chord length direction parallel to any radial direction of the projection. Both ends of any weld are located outside the projection, and the length of the line connecting the middle points of the multiple welds is greater than or equal to the diameter of the projection. Secondly, welding is performed sequentially, dividing the busbar welding surface into multiple welding zones, with each weld corresponding to one of these zones. In the orthographic projection of the joint surface, the multiple welds are arranged side by side along the center line connecting the vent hole and the insertion hole; the multiple welds are defined as welds numbered 1, 2, 3...N along the arrangement direction. During welding, the first weld is used as the reference, and welding is carried out from the first weld to the adjacent welds one by one. In the process of welding one by one, the assembly cavity is gradually reduced to allow the internal gas to be discharged from the vent hole, and the vent hole is covered from the Nth weld. The first weld to the (N-1)th weld are all welded from one end to the other, and the Nth weld is welded from both ends to the middle. Therefore, compared with the prior art, the present invention, on the one hand, is based on the insertion and overlapping of the busbar and the copper column, and gradually reduces the assembly cavity in each section during welding to allow the internal gas to be discharged from the exhaust vent, effectively reducing the splashing problem caused by excessive internal air temperature, and reducing the number of bubbles and cracks in the fusion area of ​​the copper column and the busbar, thereby significantly improving the welding quality; on the other hand, it realizes the one-time welding of the busbar and the copper column, which is simple and convenient to operate, has high welding efficiency, and low energy consumption. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is a three-dimensional structural diagram of the plug in Example 1;

[0026] Figure 2 This is a top view of the plug in Example 1;

[0027] Figure 3 for Figure 2 Schematic diagram of the sectional view along the central AA direction;

[0028] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point B;

[0029] Figure 5 Metallographic diagram (I) of the weld seam of the plug sample of Example 1;

[0030] Figure 6 Metallographic diagram (II) of the weld seam of the plug sample of Example 1;

[0031] Figure 7 Metallographic diagram (III) of the weld seam of the plug sample of Example 1;

[0032] Figure 8 Metallographic diagram (IV) of the weld seam of the plug sample of Example 1;

[0033] Figure 9 This is a three-dimensional structural diagram of the plug in Comparative Example 1;

[0034] Figure 10 This is a half-sectional view of the plug in Comparative Example 1.

[0035] Figure 11 The metallographic structure of one side of the fillet weld of the plug sample in Comparative Example 1 is shown.

[0036] Figure 12 The metallographic structure of the fillet weld on the other side of the plug sample in Comparative Example 1 is shown.

[0037] Figure 13 The metallographic structure of the splice weld on one side of the plug sample in Comparative Example 1 is shown.

[0038] Figure 14 Metallographic image of the weld seam on the other side of the plug sample in Comparative Example 1;

[0039] Wherein: T, plug; T0, busbar; k1, socket; k2, vent; k3, through hole; b, lap joint; T1, copper pillar; m, chamfered surface; q0, assembly cavity; f, weld; q1, welding area. Detailed Implementation

[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0041] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of a second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

[0045] Example 1

[0046] like Figures 1 to 4 As shown, the single-sided segmented venting plug welding process involved in this embodiment includes S1, assembly of the busbar and copper post; S2, welding of the busbar and copper post; and S3, inspection of the welding quality. The plug T involved in this embodiment includes a busbar T0 and a copper post T1, wherein the busbar T0 and the copper post T1 are made of the same material, namely, copper.

[0047] Specifically, step S1 includes: a) forming an insertion hole k1 that is interference-fitted with the assembly end of the copper column T1 from the assembly surface of the busbar T0, wherein the depth of the insertion hole k1 is at least 0.8 times the thickness of the busbar T0, and the portion between the welding surface of the busbar T0 and the insertion hole k1 constitutes an overlap portion b; and forming an exhaust hole k2 that communicates with the insertion hole k1 from the welding surface of the busbar T0; b) inserting a copper column T1 with a chamfered assembly end into the insertion hole k1 from the assembly end, forming an assembly cavity q0 from the assembly end face of the chamfered end of the copper column T1 and the inner wall of the insertion hole k1, and communicating with the assembly cavity q0 through the exhaust hole k2.

[0048] In some specific embodiments, in step a) of S1, the depth of the insertion hole k1 is 0.85 to 0.95 times the thickness of the busbar T0. In this embodiment, preferably, the depth of the insertion hole k1 is 0.93 times the thickness of the busbar T0. This arrangement accelerates the welding fusion rate between the busbar and the copper pillar while simultaneously ensuring welding quality. Furthermore, by controlling the depth of the insertion hole and the thickness of the busbar, the connection strength requirements after welding the copper pillar and the busbar are met.

[0049] Meanwhile, the diameter of the insertion hole k1 is d1, and the diameter of the vent hole k2 is d2, where 0.12d1≤d2≤0.17d1. In this embodiment, d2=0.167d1. With this arrangement, the venting requirements are met while effectively preventing molten splashing from the end of the copper pillar.

[0050] The vent hole k2 extends along the thickness direction of the busbar T0, and in the projection of the busbar T0 welding surface, the vent hole k2 coincides with the insertion hole k1. For ease of implementation, the vent hole k2 is tangent to the insertion hole k1, and the difference between the diameter of the vent hole k2 and the radius of the insertion hole k1 is less than the radius of the assembly end face of the copper pillar T1. That is, the edge of the assembly end face of the copper pillar T1 extends into the inner side of the vent hole k2. This facilitates the rapid discharge of gas after heating during welding, and shortens the gas flow path in the vent hole to reduce deformation caused by uneven stress on the busbar. At the same time, with this arrangement, in the early stage of the welding process, it can prevent the molten material flow from prematurely blocking the vent hole and affecting the venting effect.

[0051] In step b) of S1, the assembled end of the copper pillar T1 is fitted with the inner end face of the insertion hole k1, that is, the assembled end of the copper pillar T1 and the overlapping part b form an overlapping state, and the chamfered surface m of the copper pillar T1 forms an assembly cavity q0 between the inner end face and the side wall of the insertion hole k1.

[0052] In this example, step S2 includes: a) setting a welding area, wherein the projection of the insertion hole k1 on the welding surface of the busbar T0 is used as a reference, and includes multiple welds f distributed along the chord length direction parallel to any radial direction of the projection, wherein both ends of any weld f are located outside the projection, and the length of the line connecting the middle of the multiple welds f is greater than or equal to the diameter of the projection; b) welding in sequence, wherein, with any weld f as a reference, welding is performed on adjacent welds f one by one, and in the process of welding one by one, the assembly cavity q0 is gradually reduced to allow the internal gas to be discharged from the exhaust port k2.

[0053] In some specific embodiments, the welding area of ​​the busbar T0 welding surface is divided into multiple welding zones q1, with multiple welds f corresponding one-to-one with each welding zone q1. In the orthographic projection of the busbar T0 welding surface, the multiple welds f are arranged side-by-side along the line connecting the center of the vent hole k2 and the insertion hole k1. The extension direction of each weld f is perpendicular to the arrangement direction of the multiple welds f. Each pair of adjacent welds f is spliced ​​together or partially overlapped. Here, by dividing and implementing welding in stages, it is possible to facilitate the discharge of gas from the assembly cavity while effectively preventing gas backflow and the formation of bubbles between the overlapping part and the end of the copper pillar.

[0054] Simultaneously, multiple weld seams f are defined as weld seams 1, 2, 3...N along the arrangement direction. During welding, welding begins sequentially from weld seam 1, and weld seam N covers the vent hole k2. The vent hole k2 is located in the middle of weld seam N. During welding, weld seams 1 to N-1 are welded from either end to the other (adjacent weld seams can be welded in opposite directions to achieve end-to-end connection, or they can maintain the same welding direction). Welding begins from both ends of weld seam N towards the middle. In this embodiment, laser welding is used. The laser beam starts at a position on the welding surface of busbar T0 away from vent hole k2 and gradually approaches vent hole k2 to form each weld seam, sealing vent hole k2 during the formation of the last weld seam. In this embodiment, N=4.

[0055] In this example, the inspection methods in step S3 include thermal shock testing and tensile testing. Thermal shock testing is a standard inspection method and will not be elaborated upon here. In the tensile testing, the busbar T0 and copper post T1 are pulled in opposite directions using a tensile testing machine, and the maximum load the connector can withstand is recorded. When pulling the busbar T0 and copper post T1, the tensile testing machine maintains a lateral sway, with a sway amplitude of 1.5–2 mm. The sway directions of the two tensile ends can be the same or opposite. The purpose of this inspection is twofold: first, to test the connection strength between the busbar and copper post through tensile testing; second, compared to the traditional static tensile testing, to test whether the fit between the busbar and copper post is stable through the sway of the tensile force, ensuring the accuracy and reliability of the inspection results.

[0056] Therefore, in this embodiment, four plug samples welded using the welding process described in this embodiment were selected. The maximum load values ​​obtained during the tensile test are shown in Table 1.

[0057] Table 1

[0058] sample 1 2 3 4 Maximum load (N) 3943 3941 3983 4021

[0059] Furthermore, a plug sample welded using the welding process of this embodiment was selected. After processing, the metallographic microstructure at four locations on the plug sample was as follows: Figures 5 to 8 As shown, its grain boundary outline is clearly defined, and bubbles and cracks are almost invisible.

[0060] Comparative Example 1

[0061] like Figure 9 and Figure 10As shown, the plug T involved in this comparative example differs from that in Example 1 in that the busbar T0 of this comparative example is provided with a through hole k3, and the copper pillar T1 is inserted into the through hole k3 to form a clearance fit. One end of the copper pillar T1 is flush with the back of the busbar T0. Therefore, when welding the plug of this comparative example, firstly, the corresponding end face of the copper pillar T1 and the back of the busbar T0 are spliced ​​and welded; secondly, the clamping direction of the plug T is changed, and a fillet weld is performed between the side wall of the copper pillar T1 and the front of the busbar T0, thereby completing the welding of the plug T of this comparative example.

[0062] During the inspection, the inspection steps for this comparative example were the same as those for Example 1. Four plug samples welded using the welding process of this comparative example were selected, and the maximum load values ​​obtained during the tensile test (test parameters were the same as in Example 1) are shown in Table 2.

[0063] Table 2

[0064] sample 1 2 3 4 Maximum load (N) 2382 2347 2325 2247

[0065] Clearly, the plug sample using this comparative welding process can withstand a much lower maximum load than that of Example 1.

[0066] Furthermore, a plug sample welded using the welding process described in this comparative example was selected. After processing, the metallographic microstructure of the fillet welds and splice welds on the plug sample was as follows: Figures 11 to 14 As shown, compared to Example 1, the metallographic structure of the plug product completed in this comparative example clearly shows a greater number of bubbles and cracks. Therefore, the welding process of this application can effectively reduce the number of bubbles and cracks and significantly improve the welding quality.

[0067] In summary, after adopting this welding process, firstly, an insertion hole with an interference fit to the assembly end of the copper column is formed from the assembly surface of the busbar, and an vent hole communicating with the insertion hole is formed from the welding surface of the busbar; then, the copper column with a chamfered assembly end is inserted into the insertion hole from the assembly end, and an assembly cavity is formed by the assembly end face of the chamfered end of the copper column and the inner wall of the insertion hole, with the vent hole communicating with the assembly cavity; next, taking the projection of the insertion hole on the welding surface as a reference, multiple welds are distributed along the chord length direction parallel to any radial direction of the projection, wherein both ends of any weld are located outside the projection, and the length of the line connecting the middle of the multiple welds is greater than or equal to the diameter of the projection; finally, taking any weld as a reference, welding is carried out to the adjacent welds one by one, and the assembly cavity is gradually reduced in segments during each welding to allow the internal gas to be discharged from the vent hole, thus completing the perpendicular welding of the busbar and the copper column. Therefore, compared with the prior art, this invention, on the one hand, is based on the interference fit between the copper pillar and the busbar, so that the assembly end of the copper pillar is connected to the assembly cavity formed by the inner wall of the insertion hole and the vent hole formed by the welding surface of the busbar. During the welding process, the assembly cavity is gradually reduced in sections to allow internal gas to escape through the vent hole, effectively reducing the spatter problem caused by excessively high internal air temperature and reducing the number of bubbles and cracks in the fusion area of ​​the copper pillar and the busbar, thereby significantly improving the welding quality. On the other hand, it achieves one-time welding of the busbar and the copper pillar, which is simple and convenient to operate, has high welding efficiency, and low energy consumption. Thirdly, it accelerates the welding fusion rate of the busbar and the copper pillar while simultaneously ensuring welding quality. Furthermore, by controlling the insertion depth and the thickness of the busbar, it satisfies the connection requirements after the copper pillar and the busbar are welded. The strength requirements are as follows: Fourthly, while meeting the venting requirements, it can also effectively prevent the melting and splashing of the copper column end; Fifthly, it facilitates the rapid discharge of gas after heating during welding, and shortens the flow path of gas in the venting hole to reduce deformation caused by uneven stress on the busbar; Sixthly, by implementing welding in sections and steps, it facilitates the discharge of gas in the assembly cavity, and effectively prevents gas backflow into the lap joint and the copper column end to form bubbles; Seventhly, the inspection method of this embodiment is adopted in the following ways: First, the connection strength between the busbar and the copper column is tested by tensile testing; Second, compared with the traditional static tensile test, the stability of the fit relationship between the busbar and the copper column is tested by the sway of the tensile force, ensuring the accuracy and reliability of the inspection results.

[0068] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A method for single-sided welding of busbars, characterized in that, The busbar has insertion holes and vent holes formed on its assembly and welding surfaces on both sides, respectively; a copper pillar is inserted into the insertion hole from one end and overlaps with the portion of the busbar from the welding surface to the insertion hole, and one end of the copper pillar forms an assembly cavity that communicates with the vent hole between it and the inner wall of the insertion hole. The welding method includes the following steps: First, a welding area is defined, with the projection of the insertion hole on the welding surface as a reference, and including multiple welds distributed along the chord length direction parallel to any radial direction of the projection, wherein both ends of any weld are located outside the projection, and the length of the line connecting the middle parts of the multiple welds is greater than or equal to the diameter of the projection; the welding surface of the busbar is divided into multiple welding areas, and the multiple welds correspond one-to-one with the multiple welding areas, and in the orthographic projection of the welding surface of the busbar, the multiple welds are distributed side by side along the line connecting the center of the vent hole and the insertion hole, and the multiple welds are defined as the 1st, 2nd, 3rd...Nth welds along the arrangement direction; Next, welding is performed sequentially, with the first weld as the reference. Starting from the first weld, welding is carried out one by one towards the adjacent welds. During the welding process, the assembly cavity is gradually reduced in sections to allow the internal gas to be discharged from the vent hole, and the vent hole is covered from the Nth weld.

2. The single-sided welding method for busbars according to claim 1, characterized in that, During welding, welds from the first weld to the (N-1)th weld are welded from one end to the other, and welds from both ends of the Nth weld are welded towards the middle.

3. The single-sided welding method for busbars according to claim 2, characterized in that, From the first weld to the (N-1)th weld, adjacent welds are welded in opposite directions and remain connected end to end, or adjacent welds are welded in the same direction.

4. The single-sided welding method for busbars according to claim 1, characterized in that, The extension direction of each weld is perpendicular to the arrangement direction of the multiple welds.

5. The single-sided welding method for busbars according to claim 1, characterized in that, Each pair of adjacent weld seams is either spliced ​​together or partially overlapped.

6. The single-sided welding method for busbars according to claim 1, characterized in that, The vent is located in the middle of the Nth weld.

7. The single-sided welding method for busbars according to claim 1, characterized in that, Laser welding is used during welding.

8. The single-sided welding method for busbars according to claim 1, characterized in that, The welding method also includes welding quality inspection, which includes thermal shock test and tensile test. In the tensile test, the busbar and copper post are pulled in the opposite direction by a tensile testing machine, and the maximum load that the plug can withstand is recorded.

9. The single-sided welding method for busbars according to claim 7, characterized in that, When the tensile testing machine pulls the busbar and the copper column, the tensile end of the machine maintains a lateral swing with a swing amplitude of 1.5 to 2 mm.

10. The single-sided welding method for busbars according to claim 8, characterized in that, The two tension ends on the tensile testing machine, corresponding to the busbar and the copper column, have the same or opposite sway directions.

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