Welding jig and welding device

Abstract

The utility model relates to the technical field of battery production, in particular to a welding jig and a welding device.The welding jig is used for welding a first piece and a second piece and comprises a bearing body, a lap joint body and an adjusting assembly. The bearing body comprises a bearing platform, the bearing platform comprises a first bearing face used for bearing a first piece, the lap joint body is arranged on one side of the first bearing face, the lap joint body and the bearing platform form a first cavity used for containing the first piece, the lap joint body comprises a second bearing face deviating from the first bearing face, and the second bearing face is used for bearing a second piece. The adjusting assembly is connected with the bearing main body and the lap joint main body, and the adjusting assembly is movably connected with at least one of the bearing main body and the lap joint main body so as to adjust the distance between the first bearing face and the second bearing face. According to the welding jig and the welding device, the efficiency of adjusting the welding gap is effectively improved, and the adjusting precision of the welding gap between the first piece and the second piece is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a welding jig and a welding device. Background Art

[0002] During the battery module assembly process, connecting pieces are usually used to achieve electrical connection between battery cells. Usually, the connecting pieces are connected to the poles of the top cover of the battery cells by welding. Due to the assembly tolerance requirements of the CCS components (Cells Contact System, which is an integrated system composed of signal acquisition components, plastic structural parts, and copper and aluminum bars), it is necessary to form a welding gap between the pole and the connecting piece during the welding process of the pole and the connecting piece to meet the control requirements of the mechanical properties, melting depth, melting width and other parameters at the connection between the pole and the connecting piece.

[0003] In the current welding process of the pole and the connecting piece, the welding gap is usually adjusted by setting a gasket between the pole and the connecting piece. However, since the welding gap is usually small (usually between 0.1mm and 2.0mm), it is difficult to adjust the gasket manually, and the adjustment cycle is long, which affects the welding efficiency; if the gasket is fixed, it is necessary to set an adhesive layer between the gasket and the pole and / or between the gasket and the connecting piece. The thickness of the adhesive layer greatly affects the accuracy of the welding gap; if the gasket is not fixed, the pole and the connecting piece are very likely to move during the welding process, resulting in welding deviation or changes in the size of the welding gap. Utility Model Content

[0004] The purpose of the present application is to provide a welding jig and a welding device, so as to solve the technical problems of inconvenient welding gap adjustment and easy misalignment of welding position existing in the prior art to a certain extent.

[0005] According to a first aspect of the present application, a welding jig is provided, which is used for welding a first piece and a second piece, and comprises a supporting body, a lap body and an adjustment component;

[0006] The supporting body includes a supporting platform, the supporting platform includes a first supporting surface for supporting the first piece, the overlapping body is arranged on one side of the first supporting surface, the overlapping body and the supporting platform form a first cavity for placing the first piece, the overlapping body includes a second supporting surface away from the first supporting surface, the second supporting surface is used to support the second piece;

[0007] The adjusting component connects the supporting body and the overlapping body, and the adjusting component is movably connected to at least one of the supporting body and the overlapping body to adjust the distance between the first supporting surface and the second supporting surface.

[0008] Preferably, the first cavity is a placement groove, and the placement groove is provided with an opening at least on one side facing the overlapping body.

[0009] Preferably, the supporting body further includes at least two supporting ribs, and the supporting ribs and the supporting platform are arranged to form the placement groove.

[0010] Preferably, the supporting body further comprises a limiting portion, wherein the limiting portion covers one end of the seating groove, a limiting gap is formed between the limiting portion and the bottom wall of the seating groove, and an end portion of the first member can extend into the limiting gap.

[0011] Preferably, the adjustment assembly includes a first adjustment portion, which is disposed on the bottom wall of the seating groove and can extend out and retract relative to the bottom wall of the seating groove.

[0012] Preferably, there are a plurality of the first adjusting parts, the plurality of the first adjusting parts are evenly arranged on the bottom wall of the placement groove, and the plurality of the first adjusting parts are raised and lowered synchronously.

[0013] Preferably, the adjustment assembly further includes a second adjustment portion, the overlapping body is connected to the supporting body via the second adjustment portion, and the second adjustment portion can drive the overlapping body to approach and move away from the first supporting surface.

[0014] Preferably, it also includes a welding protection component, which can be covered on top of the placement groove, and the welding protection component is provided with an operation window that penetrates the welding protection component, and the operation window is used for performing welding operations on the first piece and the second piece.

[0015] Preferably, the welding protection assembly comprises:

[0016] A welding protection cover, wherein the operation window is arranged on the welding protection cover;

[0017] The mounting seat is connected to the supporting body, and the welding protection cover is detachably connected to the mounting seat.

[0018] According to the second aspect of the present application, a welding device is provided, comprising the welding jig described in any of the above technical solutions, and thus having all the beneficial technical effects of the welding jig, which will not be described in detail herein.

[0019] Compared with the prior art, the beneficial effects of this application are:

[0020] The welding jig provided in the present application forms a first cavity for placing the first piece between the overlapping body and the supporting platform, so that sufficient adjustment space is formed between the overlapping body and the supporting platform, and is connected to the supporting body and / or the overlapping body through an adjustment component, so that the adjustment component can adjust the distance between the first supporting surface for supporting the first piece and the second supporting surface for supporting the second piece, thereby realizing the adjustment of the gap between the first piece and the second piece (for example, the battery top cover and the connecting plate), effectively replacing the form of adjustment through gaskets in the prior art, effectively improving the efficiency of adjusting the welding gap, so that the welding gap between the first piece and the second piece is freed from the limitation of the accuracy of the gasket, and improving the adjustment accuracy of the welding gap between the first piece and the second piece.

[0021] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the isometric structure of a welding fixture provided in an embodiment of the present application;

[0024] Figure 2 Another isometric structural schematic diagram of the welding fixture provided in the embodiment of the present application;

[0025] Figure 3 Another isometric structural schematic diagram of the welding fixture provided in the embodiment of the present application;

[0026] Figure 4 A schematic diagram of the exploded structure of a welding jig provided in an embodiment of the present application.

[0027] Reference numerals:

[0028] 1-supporting body; 10-receiving groove; 11-supporting platform; 12-supporting rib; 13-supporting leg; 14-limiting part; 2-overlapping body; 3-adjusting assembly; 31-first adjusting part; 32-second adjusting part; 33-third adjusting part; 4-welding protection assembly; 41-welding protection cover; 42-receiving seat; 51-first piece; 52-second piece.

[0029] F1-first direction; F2-second direction; F3-third direction. DETAILED DESCRIPTION

[0030] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0031] The components of the embodiments of the present application generally described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0032] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0033] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Refer to the following Figures 1 to 4 The present invention describes a welding jig and a welding device according to some embodiments of the present application.

[0036] See also Figures 1 to 4As shown, an embodiment of the first aspect of the present application provides a welding jig for welding a first piece 51 and a second piece 52, which includes a supporting body 1, an overlapping body 2 and an adjusting assembly 3, wherein the supporting body 1 includes a supporting platform 11, the supporting platform 11 includes a first supporting surface for supporting the first piece 51, the overlapping body 2 is arranged on one side of the first supporting surface, the overlapping body 2 and the supporting platform 11 form a first cavity for placing the first piece 51, the overlapping body 2 includes a second supporting surface facing away from the first supporting surface, and the second supporting surface is used to support the second piece 52. The adjusting assembly 3 connects the supporting body 1 and the overlapping body 2, and the adjusting assembly 3 is movably connected to at least one of the supporting body 1 and the overlapping body 2 to adjust the distance between the first supporting surface and the second supporting surface.

[0037] The welding jig provided by the above-mentioned technical features of the present application forms a first cavity for placing the first piece 51 between the overlapping body 2 and the supporting platform 11, so that sufficient adjustment space is formed between the overlapping body 2 and the supporting platform 11, and is connected to the supporting body 1 and / or the overlapping body 2 through the adjustment component 3, so that the adjustment component 3 can adjust the distance between the first supporting surface for supporting the first piece 51 and the second supporting surface for supporting the second piece 52, thereby realizing the adjustment of the gap between the first piece 51 and the second piece 52 (for example, the battery top cover and the connecting plate), effectively replacing the form of adjustment through gaskets in the prior art, effectively improving the efficiency of adjusting the welding gap, so that the welding gap between the first piece 51 and the second piece 52 is freed from the limitation of the accuracy of the gasket, and improving the adjustment accuracy of the welding gap between the first piece 51 and the second piece 52.

[0038] Preferably, if Figures 1 to 4 As shown, the first cavity may be a placement groove 10, and the placement groove 10 may be provided with an opening on at least one side facing the overlapping body 2, so that at least parts of the first piece 51 and the second piece 52 can overlap in the first direction F1, thereby facilitating welding of the first piece 51 and the second piece 52.

[0039] like Figures 1 to 4 As shown, F1 shown in the figure may be an example of the first direction F1. For the convenience of description, two directions intersecting each other on a plane perpendicular to the first direction F1 are defined as the second direction F2 and the third direction F3, respectively, wherein F2 shown in the figure may be an example of the second direction F2, and F3 shown in the figure may be an example of the third direction F3. Preferably, the second direction F2 may be perpendicular to the third direction F3. Preferably, the first supporting surface and the second supporting surface may be parallel to the plane determined by both the second direction F2 and the third direction F3.

[0040] Preferably, if Figures 1 to 4As shown, the supporting body 1 may further include at least two supporting ribs 12 , and the supporting ribs 12 and the supporting platform 11 may surround and form the placement groove 10 .

[0041] Preferably, if Figures 1 to 4 As shown, the supporting body 1 can also be provided with two supporting ribs 12 extending along the third direction F3, and the two supporting ribs 12 can be spaced apart along the second direction F2 to form a strip-shaped placement groove 10 extending along the third direction F3 between the two supporting ribs 12, so that the placement groove 10 can better adapt to the shape of the battery top cover.

[0042] However, the supporting rib 12 is not limited to a strip-shaped structure extending along the third direction F3, and the supporting rib 12 may also extend along other directions as long as the first cavity for accommodating the first member 51 can be formed. In addition, the supporting rib 12 may also be in an arc shape, a curve shape, a fold line shape or other irregular shapes.

[0043] Preferably, if Figures 1 to 4 As shown, the supporting body 1 can also include a limiting portion 14, which is covered on one end of the seating groove 10, and a limiting gap is formed between the limiting portion 14 and the bottom wall of the seating groove 10, and the end of the first piece 51 can extend into the limiting gap. In this way, on the one hand, when the first piece 51 is arranged in the seating groove 10, the end of the first piece 51 can extend into the limiting gap. If the size of the first piece 51 in the third direction F3 is larger than the size of the welding jig, then under the blocking and pressing action of the limiting portion 14, the end of the first piece 51 can be effectively prevented from warping; on the other hand, the first piece 51 can be fixed by the welding jig through the joint action of the limiting portion 14 and the first adjusting portion 31 described below.

[0044] Preferably, if Figures 1 to 4 As shown, the above-mentioned limiting portion 14 can be arranged at one end of the above-mentioned mounting groove 10 in the third direction F3, and the limiting portion 14 can extend along the second direction F2. The two ends of the limiting portion 14 in the second direction F2 can be respectively arranged on the above-mentioned supporting rib 12 and fixedly connected to the supporting rib 12.

[0045] Preferably, if Figure 4 As shown, the limiting portion 14 can be detachably connected to the supporting rib 12 via bolts, so as to adjust the position of the limiting portion 14 in the first direction F1, thereby enabling the welding fixture to adapt to first pieces 51 of different thicknesses.

[0046] In an embodiment, preferably, Figure 3 and Figure 4As shown, the adjustment assembly 3 may include a first adjustment portion 31, which is disposed on the bottom wall of the placement groove 10 and can be extended and retracted relative to the bottom wall of the placement groove 10, so as to adjust the distance between the first member 51 and the bottom wall of the placement groove 10 to achieve the purpose of adjusting the distance between the first supporting surface and the second supporting surface. In other words, the first supporting plane may be the upper surface of the first adjustment portion 31.

[0047] Preferably, if Figure 3 and Figure 4 As described above, the bottom wall of the above-mentioned mounting groove 10 can be provided with an internal threaded hole extending along the first direction F1, and the above-mentioned first adjustment part 31 can be a columnar structure with external threads such as a bolt, a screw, etc. that can cooperate with the internal threaded hole. In this way, the purpose of adjusting the distance between the first supporting surface and the second supporting surface can be achieved by screwing the first adjustment part 31.

[0048] Preferably, if Figures 1 to 4 As shown, the first adjusting portion 31 can penetrate the supporting platform 11 along the first direction, so that the first adjusting portion 31 can be screwed from the side of the supporting platform 11 facing away from the supporting rib 12 for easy operation.

[0049] Correspondingly, if Figures 1 to 4 As shown, the supporting body 1 may further include a supporting leg 13, which may be disposed on a side of the supporting platform 11 facing away from the supporting rib 12, so that a certain adjustment space is formed between the supporting platform and the bottom surface.

[0050] Optionally, the first adjusting portion 31 may also be a lifting device (eg, a linear motor, a cylinder, etc.) disposed on the bottom wall of the placement groove 10 .

[0051] Preferably, there can be a plurality of the first adjustment parts 31 , which are evenly arranged on the bottom wall of the placement groove 10 , and the plurality of first adjustment parts 31 are raised and lowered synchronously to ensure the stability of the lifting and lowering of the first piece 51 and the horizontality of the first piece 51 .

[0052] Preferably, if Figures 1 to 4 As shown, the adjustment component 3 can also include a second adjustment portion 32, and the above-mentioned overlapping body 2 can be connected to the supporting body 1 via the second adjustment portion 32. The second adjustment portion 32 can drive the overlapping body 2 to approach and move away from the first supporting surface, thereby achieving the purpose of adjusting the distance between the first supporting surface and the second supporting surface.

[0053] Preferably, if Figure 2 As shown, the overlapping body 2 can be disposed on one of the two supporting ribs 12 via the second adjusting portion 32 .

[0054] Optionally, the second adjusting portion 32 may include a stud extending along the first direction F1 , the stud passing through the overlapping body 2 along the first direction F1 and being threadedly connected to the overlapping body 2 , so as to adjust the position of the overlapping body 2 in the first direction F1 .

[0055] Alternatively, if Figure 3 and Figure 4 As shown, the second adjustment portion 32 may also include a sliding column and a bayonet extending along the first direction F1. The sliding column is slidably connected to the lap joint body 2 along the first direction F1. The lap joint body 2 can be engaged with the sliding column via the bayonet. In this way, the position of the lap joint body 2 can be adjusted by changing the setting position of the bayonet.

[0056] Preferably, if Figure 1 and Figure 2 As shown, the overlapping body 2 can be in the form of a sheet, and at least a portion of the overlapping body 2 can extend from one of the two supporting ribs 12 to the opening of the placement groove 10. In this way, the first piece 51 can be arranged in the placement groove 10, and the second piece 52 can be arranged on the other of the two supporting ribs 12, and one end of the second piece 52 to be connected to the first piece 51 extends into the opening of the placement groove 10, and the overlapping body 2 overlaps one end of the second piece 52 to be connected to the first piece 51, thereby achieving the support of the second piece 52 by the welding fixture.

[0057] Preferably, if Figure 3 As shown, the adjustment assembly 3 may further include a third adjustment portion 33, which may be disposed on the bottom wall of the placement groove 10. When the first piece 51 is disposed in the placement groove 10, a predetermined gap is provided between the first piece 51 and the other of the two supporting ribs 12 (i.e., the one without the overlapping body 2). The third adjustment portion 33 is disposed in the predetermined gap, and the third adjustment portion 33 may also extend and retract relative to the bottom wall of the placement groove 10. Thus, the third adjustment portion 33 may adjust the position of the second piece 52 in the first direction F1 from the side where the other of the two supporting ribs 12 (i.e., the one without the overlapping body 2) is located, thereby ensuring the horizontality of the second piece 52. In other words, the second supporting plane may be a plane determined by both the upper surface of the portion of the overlapping body 2 extending into the opening of the placement groove 10 and the upper surface of the third adjustment portion 33.

[0058] Optionally, the configuration structure of the third adjustment portion 33 is similar to that of the first adjustment portion 31 , which will not be described in detail herein.

[0059] In an embodiment, Figures 1 to 4As shown, preferably, the above-mentioned welding jig can also include a welding protection component 4, which can be covered on the top of the mounting groove 10. The welding protection component 4 is provided with an operation window that penetrates the welding protection component 4, and the operation window is used to perform welding operations on the first piece 51 and the second piece 52 to prevent sparks from flying during welding.

[0060] Preferably, if Figures 1 to 4 As shown, the welding protection assembly 4 may include a welding protection cover 41 and a mounting seat 42, the operation window is arranged on the welding protection cover 41, the mounting seat 42 may be connected to the supporting body 1, and the welding protection cover 41 and the mounting seat 42 may be detachably connected to facilitate the replacement of the welding protection cover 41.

[0061] Preferably, if Figure 3 As shown, the above-mentioned seat 42 may include two parts spaced apart along the third direction F3, and the above-mentioned welding protection cover 41 may be arranged between the two parts. The two parts may be respectively fixed to the upper sides of the two ends of the above-mentioned supporting rib 12 in the third direction F3 to prevent the seat 42 from interfering with the adjustment component to adjust the distance between the first supporting surface and the second supporting surface.

[0062] Optionally, the welding protection cover 41 may be a welding copper nozzle.

[0063] Optionally, the first piece 51 may be a battery top cover, and the second piece 52 may be a connecting sheet, but is not limited thereto. As long as they are compatible with the first cavity and the overlapping body 2, the first piece 51 and the second piece 52 may also be other structures to be welded.

[0064] Based on the above-described features, taking the first piece 51 as a battery top cover and the second piece 52 as a connecting piece as an example, Figures 1 to 4 The welding jig shown is described below, and the working principle of the welding jig will be described in detail below.

[0065] Install the battery top cover, set the battery top cover in the installation groove 10, align the battery cell pole of the battery top cover with the welding window, so that one end of the battery top cover extends into the limiting gap, adjust the first adjustment part 31, so that the upper surface of the battery top cover abuts against the limiting part 14, and the battery top cover is fixed.

[0066] The connecting piece is placed and processed so that the connecting piece is arranged on the other one of the supporting ribs 12 (i.e., the one without the overlapping body 2) and the end of the connecting piece to be connected with the battery top cover extends into the opening of the placement groove 10, and the through hole of the connecting piece is exposed by the welding window, the overlapping body 2 is overlapped with the end of the connecting piece to be connected with the battery top cover, and then the connecting piece is supported by the welding fixture, and the second adjustment part 32 and the third adjustment part 33 are adjusted respectively to adjust the welding gap between the battery top cover and the connecting piece.

[0067] The welding gap verification can be carried out by using a vernier caliper to measure whether the welding gap meets the welding requirements through the via holes of the connecting piece. If so, the welding operation is performed. If not, the second adjustment part 32 and the third adjustment part 33 are continuously adjusted until the position is satisfied.

[0068] Welding: After the welding gap adjustment is completed, the battery top cover and the connecting piece can be welded through the welding window on the welding protection cover 41.

[0069] The embodiment of the second aspect of the present application also provides a welding device, including the welding jig described in any of the above embodiments, and thus has all the beneficial technical effects of the welding jig, which will not be repeated here.

[0070] Preferably, not shown in the figures, the welding device may further include welding equipment.

[0071] Optionally, the welding device may be a laser welding machine, but is not limited thereto. As long as the welding of the first piece 51 and the second piece 52 can be achieved, the welding device may also be other welding devices.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A welding jig for welding a first piece (51) and a second piece (52), characterized in that: It comprises a supporting body (1), an overlapping body (2) and an adjustment component (3); The supporting body (1) comprises a supporting platform (11), the supporting platform (11) comprises a first supporting surface for supporting the first piece (51), the overlapping body (2) is arranged on one side of the first supporting surface, the overlapping body (2) and the supporting platform (11) form a first cavity for placing the first piece (51), the overlapping body (2) comprises a second supporting surface facing away from the first supporting surface, the second supporting surface is used to support the second piece (52); The adjustment component (3) connects the supporting body (1) and the overlapping body (2), and the adjustment component (3) is movably connected to at least one of the supporting body (1) and the overlapping body (2) to adjust the distance between the first supporting surface and the second supporting surface.

2. The welding jig according to claim 1, characterized in that: The first cavity is a placement groove (10), and the placement groove (10) is provided with an opening on at least one side facing the overlapping body (2).

3. The welding jig according to claim 2, characterized in that: The supporting body (1) further comprises at least two supporting convex ribs (12), and the supporting convex ribs (12) and the supporting platform (11) are arranged to form the placement groove (10).

4. The welding jig according to claim 3, characterized in that: The supporting body (1) further comprises a limiting portion (14), wherein the limiting portion (14) is covered on one end of the placement groove (10), and a limiting gap is formed between the limiting portion (14) and the bottom wall of the placement groove (10), and the end of the first member (51) can extend into the limiting gap.

5. The welding jig according to claim 2, characterized in that: The adjustment component (3) comprises a first adjustment portion (31), wherein the first adjustment portion (31) is arranged on the bottom wall of the placement groove (10) and is capable of extending out and retracting relative to the bottom wall of the placement groove (10).

6. The welding jig according to claim 5, characterized in that: There are a plurality of the first adjustment parts (31), the plurality of the first adjustment parts (31) are evenly arranged on the bottom wall of the placement groove (10), and the plurality of the first adjustment parts (31) are raised and lowered synchronously.

7. The welding jig according to claim 2, characterized in that: The adjustment assembly (3) further comprises a second adjustment portion (32), the overlapping body (2) being connected to the supporting body (1) via the second adjustment portion (32), and the second adjustment portion (32) being capable of driving the overlapping body (2) to approach or move away from the first supporting surface.

8. The welding jig according to any one of claims 2 to 7, characterized in that: It also includes a welding protection component (4), which can be covered on the top of the placement groove (10), and the welding protection component (4) is provided with an operation window that passes through the welding protection component (4), and the operation window is used to perform welding operations on the first part (51) and the second part (52).

9. The welding jig according to claim 8, characterized in that: The welding protection assembly (4) comprises: A welding protection cover (41), wherein the operation window is arranged on the welding protection cover (41); The placement seat (42) is connected to the supporting body (1), and the welding protection cover (41) is detachably connected to the placement seat (42).

10. A welding device, characterized in that: A welding jig comprising any one of claims 1 to 9.

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