A welding tool and welding method for a metal bellows

Abstract

The application discloses a welding tool and a welding method for a metal corrugated film box. In the welding tool, a positioning body one is provided in a cylindrical structure, an outer thread is arranged on the cylindrical surface of the positioning body one, coaxial columnar bosses are arranged at two ends of the positioning body one, and a first through hole penetrating through the columnar bosses at two ends is arranged at the central axis position of the positioning body one; an adjusting nut is provided in a cylindrical sleeve structure with an inner thread, is coaxially threadedly connected with the positioning body one, and a first stepped groove is arranged on the side end face of the adjusting nut; a positioning body two is provided in a columnar structure with a step, a second stepped groove is arranged on the end face of the large-end cylinder of the positioning body two, a taper hole is arranged on the end face of the small-end cylinder of the positioning body two, and a second through hole penetrating through the whole is arranged at the central axis position of the positioning body two. The technical scheme of the application solves the problem that the metal corrugated film box is scrapped due to welding defects caused by assembly problems before welding in the combined welding process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal corrugated diaphragm box welding, in particular to a metal corrugated diaphragm box welding tool and a welding method. BACKGROUND

[0002] The metal corrugated diaphragm box is composed of two circular corrugated diaphragm sheets welded together, and a connecting structure is welded at the center of the metal diaphragm box for connection with other mechanisms. The metal corrugated diaphragm box is used as a pressure sensing element in an instrument and is widely used in various technical fields such as aviation, aerospace, chemical industry, food industry, etc. It can convert the sensed pressure into displacement, and then through certain transmission mechanisms or output methods, display the measured pressure value or provide feedback signals to the automatic control system.

[0003] In the manufacturing process, the metal corrugated diaphragm box usually uses ultra-thin stainless steel material, and the outer edge is welded by electron beam welding. The connecting structure at the center of the metal corrugated diaphragm box is welded by capacitive energy storage spot welding method. The welding quality is greatly affected by the positioning accuracy in the assembly process of the parts. If the assembly gap of the parts before welding is large, the positioning accuracy is poor, and the position deviation of the parts, all of which will cause quality defects in the welding process, resulting in product scrap. SUMMARY

[0004] The purpose of the present application is to provide a metal corrugated diaphragm box welding tool and a welding method to solve the problem of product scrap caused by welding defects due to assembly problems before welding in the assembly and welding process of the existing metal corrugated diaphragm box.

[0005] The technical solution of the present application is to provide a metal corrugated diaphragm box welding tool, which comprises a positioning body one 1, an adjusting nut 2 and a positioning body two 3.

[0006] The positioning body one 1 is provided in a cylindrical structure, the cylindrical surface is provided with external threads, both ends are provided with coaxial columnar bosses, and the center axis position of the positioning body one 1 is provided with a first through hole 11 penetrating the columnar bosses at both ends.

[0007] The adjusting nut 2 is provided in a cylindrical sleeve structure with internal threads, coaxially threaded connected with the positioning body one 1, and a first stepped groove 21 is formed on one side end face of the adjusting nut 2.

[0008] The positioning body two 3 is provided in a columnar structure with steps, a second stepped groove 31 is formed on the end face of the large end cylinder, a tapered hole is formed on the end face of the small end cylinder, and a second through hole 32 penetrating the whole is formed at the center axis position of the positioning body two 3.

[0009] Optionally, in the metal corrugated diaphragm box welding tool described above,

[0010] After the adjusting nut 2 is screwed on the outside of the positioning body 1, the relative position between the end face of the step groove 1 of the adjusting nut 2 and the end face of the cylindrical boss on the same side of the positioning body 1 is adjusted by screwing the adjusting nut 2 and the positioning body 1.

[0011] Optionally, in the welding tool for the metal corrugated film box as described above,

[0012] The outer diameter of the adjusting nut 2 is equal to the outer diameter of the large-end cylinder in the positioning body 2 3, and the inner diameter of the first step groove 21 in the adjusting nut 2 is equal to the inner diameter of the second step groove 31 in the large-end cylinder of the positioning body 2 3.

[0013] Optionally, in the welding tool for the metal corrugated film box as described above,

[0014] When the adjusting nut 2 and the positioning body 1 are combined and welded, the end face of the first step groove 21 in the adjusting nut 2 is higher than the end face of the cylindrical boss on the same side of the positioning body 1.

[0015] The center top rod 5 to be welded is erected on the top end of the boss of the positioning body 1 through the top end welding part thereof, and the rod body is placed in the first through hole 11 of the positioning body 1; the corrugated film sheet 6 to be welded is placed in the first step groove 21 of the adjusting nut 2, so that the outermost circle of the corrugated film sheet 6 is in contact with the inner edge of the top end of the first step groove 21.

[0016] Optionally, in the welding tool for the metal corrugated film box as described above,

[0017] The gap between the bottom end center face of the corrugated film sheet 6 and the top end welding part of the center top rod 5 is adjusted by rotating the screwing position of the adjusting nut 2 and the positioning body 1, and the coaxiality of the corrugated film sheet 6 and the center top rod 5 is maintained.

[0018] Optionally, in the welding tool for the metal corrugated film box as described above,

[0019] The welding tool for the metal corrugated film box is used to place and assemble the corrugated film sheet 6 and the center top rod 5 through the combination of the adjusting nut 2 and the positioning body 1, so as to complete the welding of one corrugated film sheet assembly, place another corrugated film sheet assembly through the positioning body 2 3, and set the opening of the second step groove 31 in the positioning body 2 3 and the first step groove 21 in the adjusting nut 2 in butt joint, and rotate the adjusting nut 2 to tightly fit the outer edge planes of the two corrugated film sheet assemblies, so as to be welded into a metal corrugated film box.

[0020] The embodiment of the present application also provides a welding method for a metal corrugated film box, which is executed by using the welding tool for the metal corrugated film box as described in any one of the above embodiments, and comprises the following steps:

[0021] The combination of the adjusting nut 2 and the positioning body one 1 is used to assemble one center top rod 5 and one corrugated diaphragm 6, and the center top rod 5 top end welding part and the corrugated diaphragm 6 bottom end center surface are connected by spot welding, so as to form a corrugated diaphragm assembly; two corrugated diaphragm assemblies are formed by the above assembly and welding mode;

[0022] The combination of the adjusting nut 2 and the positioning body one 1 is used to assemble one corrugated diaphragm assembly, the positioning body two 3 is used to assemble another corrugated diaphragm assembly, and the two corrugated diaphragm assemblies are connected after abutting, and then welding is performed, so as to form the metal corrugated diaphragm box 4.

[0023] Optionally, the welding method of the metal corrugated diaphragm box has the steps that:

[0024] Step 1, the adjusting nut 2 and the positioning body one 1 are connected, and the combination of the adjusting nut 2 and the positioning body one 1 is used as a spot welding electrode and is installed at a lower electrode interface position of a capacitor energy storage spot welding machine;

[0025] Step 2, the center top rod 5 is erected on the top end of the positioning body one 1 through the top end welding part, the rod body is arranged in the first through hole 11 of the positioning body one 1, and the corrugated diaphragm 6 is arranged in the first step groove 21 of the adjusting nut 2;

[0026] Step 3, the position of the adjusting nut 2 and the positioning body one 1 is rotated, so that the bottom end center surface of the corrugated diaphragm 6 and the top end welding part of the center top rod 5 are completely in contact, the corrugated diaphragm 6 and the center top rod 5 are coaxial, the corrugated diaphragm 6 and the center top rod 5 are spot welded, and a corrugated diaphragm assembly is formed;

[0027] Step 4, another corrugated diaphragm assembly is welded by repeating steps 1 to 3;

[0028] Step 5, the combination of the adjusting nut 2 and the positioning body one 1 is installed on a horizontal position chuck of a vacuum electron beam welding machine, the rod body of one corrugated diaphragm assembly is arranged in the first through hole 11 of the positioning body one 1, the rod body of another corrugated diaphragm assembly is arranged in the second through hole 32 of the positioning body two 3, the first step groove 21 of the adjusting nut 2 and the second step groove 31 of the positioning body two 3 are abutted, and the tail seat of the vacuum electron beam welding machine is tightly arranged on the tail end taper hole of the positioning body two 3, the outer edge planes of the two corrugated diaphragm assemblies are tightly matched by rotating the adjusting nut 2, vacuum electron beam welding is performed, and a metal corrugated diaphragm box 4 with high-quality welding seams is obtained.

[0029] The welding tool and the welding method of the metal corrugated diaphragm box have the following beneficial effects:

[0030] In one aspect, the combination of the positioning body one 1 and the adjusting nut 2 is used to assemble the corrugated diaphragm 6 and the center rod 5 to be welded, so that the outermost corrugated edge of the corrugated diaphragm 6 is in contact with the inner edge of the top end of the first step groove 21 in the adjusting nut 2, and the position of the corrugated diaphragm 6 is adjusted by rotating the adjusting nut 2 to achieve the requirement of precise assembly before welding, and the coaxiality of the corrugated diaphragm 6 and the center rod 5 is ensured.

[0031] In another aspect, the positioning body two 3 is used to assemble a corrugated diaphragm assembly after welding, and the outermost corrugated edge of the corrugated diaphragm 6 is in contact with the inner edge of the top end of the second step groove 31 in the positioning body two 3, and is used in cooperation with the assembly combination (i.e. the assembly combination of the positioning body one 1 and the adjusting nut 2) of another corrugated diaphragm assembly after welding to implement the welding of the metal corrugated diaphragm box, which is beneficial to improve the positioning precision of the welding and clamping of the metal corrugated diaphragm box, reduce the assembly gap, ensure the welding size precision of the corrugated diaphragm assembly and the metal corrugated diaphragm box, ensure the product quality consistency, and improve the work efficiency and product qualification rate.

[0032] In still another aspect, the welding tool structure provided by the embodiment of the present application is exquisite and easy to operate, can ensure that the assembly precision of the un-welded corrugated diaphragm meets the welding requirement, improve the work efficiency, and reduce the product scrap problem, and has great technical progress and significant technical effect. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solutions of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0034] Figure 1 A structure schematic view of a welding tool of a metal corrugated diaphragm box provided by the embodiment of the present application;

[0035] Figure 2 An assembly schematic view of a corrugated diaphragm assembly welded by the welding tool of the metal corrugated diaphragm box provided by the embodiment of the present application;

[0036] Figure 3 An assembly schematic view of a metal corrugated diaphragm box welded by the welding tool of the metal corrugated diaphragm box provided by the embodiment of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0038] 1: positioning body one;

[0039] 11: first through hole

[0040] 2: adjusting nut;

[0041] 21: first step groove;

[0042] 3: second positioning body

[0043] 31: second stepped groove

[0044] 32: second through hole

[0045] 4: corrugated film box

[0046] 5: center top rod

[0047] 6: corrugated film sheet DETAILED DESCRIPTION

[0048] To make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0049] As described in the above background, the existing metal corrugated film box has welding defects due to assembly problems before welding, thereby causing product scrap. The assembly of parts before welding plays a key role, and the size of the assembly gap and the position between the parts will cause quality defects such as incomplete fusion, mispositioning, spatter, breakdown, and chronic leakage during the welding process, thereby causing product scrap. Various problems existing in the existing metal corrugated film box after welding are also caused by assembly problems before welding.

[0050] A good quality metal corrugated film box welding surface should be smooth, without welding bumps, craters and incomplete fusion and other welding defects. The researchers of the present application consider that, in addition to selecting reasonable process parameters, a higher assembly precision can be achieved by improving the precision of the welding fixture to improve the welding qualification rate of the metal corrugated film box. The welding tool for the metal corrugated film box provided in the embodiments of the present application can assemble and position the unwelded metal corrugated film sheet, so that the assembly tolerance of the metal corrugated film sheet before welding is within the allowable tolerance range, so as to ensure the qualification rate of the metal corrugated film box after welding.

[0051] The following specific embodiments provided by the present application can be combined with each other, and the same or similar concepts or processes can not be described in some embodiments.

[0052] Figure 1 A structure diagram of a welding tool for a metal corrugated film box provided in the embodiments of the present application. The welding tool for the metal corrugated film box provided in the embodiments of the present application can include: a first positioning body 1, an adjusting nut 2, and a second positioning body 3.

[0053] Reference Figure 1The positioning body one 1 is provided in a cylindrical structure, the cylindrical surface is provided with external threads, coaxial columnar bosses are arranged at both ends, and a first through hole 11 is arranged at the central axis position of the positioning body one 1 and penetrates the columnar bosses at both ends. Figure 1 As shown in the actual application, the boss at one end of the positioning body one 1 is a small boss, and the boss at the other end is a large boss.

[0054] In the embodiment of the application, the adjusting nut 2 is provided in a cylindrical sleeve structure with internal threads, is coaxially connected with the positioning body one 1, and a first stepped groove 21 is arranged on one side end surface of the adjusting nut 2.

[0055] The positioning body two 3 is provided in a columnar structure with steps, a second stepped groove 31 is arranged on the end surface of the large-end cylinder, a tapered hole is arranged on the end surface of the small-end cylinder, and a second through hole 32 is arranged at the central axis position of the positioning body two 3 and penetrates the whole body.

[0056] The welding tool for the metal corrugated film box provided in the embodiment of the application can be used to assemble the corrugated film sheet 6 and the central top rod 5 through the combined structure of the adjusting nut 2 and the positioning body one 1, so as to obtain high assembly precision, thereby realizing high-precision welding of the corrugated film sheet assembly.

[0057] In the embodiment of the application, as shown in the actual application, Figure 1 After the adjusting nut 2 is threadedly connected to the outside of the positioning body one 1, the relative position between the end surface of the stepped groove of the adjusting nut 2 and the end surface of the same-side columnar boss (i.e., the small boss shown in the figure) of the positioning body one 1 is adjusted by screwing the thread connection position of the adjusting nut 2 and the positioning body one 1. Figure 1

[0058] In the embodiment of the application, as shown in the actual application, Figure 1 The outer diameter of the adjusting nut 2 is equal to the outer diameter of the large-end cylinder of the positioning body two 3, and the inner diameter of the first stepped groove 21 of the adjusting nut 2 is equal to the inner diameter of the second stepped groove 31 of the large-end cylinder of the positioning body two 3.

[0059] Figure 2 The adjusting nut 2 and the positioning body one 1 are threadedly combined, and the end surface of the first stepped groove 21 of the adjusting nut 2 is higher than the end surface of the same-side boss of the positioning body one 1.

[0060] As​Figure 2 As shown, the center top rod 5 to be welded is erected on the boss top of the positioning body one 1 through its top end welding part, and the rod body is placed in the first through hole 11 of the positioning body one 1; the corrugated diaphragm 6 to be welded is placed in the first step groove 21 of the adjusting nut 2, so that the outermost circle corrugated edge of the corrugated diaphragm 6 is in contact with the inner edge of the top end of the first step groove 21.

[0061] In the embodiment of the present application, the adjusting nut 2 and the positioning body one 1 are combined to assemble the center top rod 5 and the corrugated diaphragm 6 to be welded before welding, the adjusting nut 2 and the positioning body one 1 are placed vertically along the axis, and the adjusting nut 2 and the positioning body one 1 are coaxial, the rod body of the center top rod 5 is embedded in the first through hole 11 of the positioning body one 1 from the top end, and is limited on the small boss top through the welding part, the corrugated diaphragm 6 is placed in the first step groove 21 of the adjusting nut 2 as a whole, and the outermost circle corrugated edge of the corrugated diaphragm 6 is required to be in contact with the inner edge of the top end of the first step groove 21 to ensure the coaxiality of the corrugated diaphragm 6 and the center top rod 5.

[0062] During the installation process, the up and down positions of the corrugated diaphragm 6 can be changed by rotating the adjusting nut 2, that is, the gap between the bottom center surface of the corrugated diaphragm 6 and the top end welding part of the center top rod 5 can be adjusted by rotating the screwing position of the adjusting nut 2 and the positioning body one 1, and during the adjustment process, the coaxiality of the corrugated diaphragm 6 and the center top rod 5 can be always maintained.

[0063] Figure 3 The welding tool for the metal corrugated diaphragm box provided by the embodiment of the present application is used for welding the metal corrugated diaphragm box. On the one hand, the adjusting nut 2 and the positioning body one 1 are combined to place and assemble the corrugated diaphragm 6 and the center top rod 5, so that the welding of one corrugated diaphragm assembly is completed;

[0064] On the other hand, the other corrugated diaphragm assembly can be placed through the positioning body two 3, and the two corrugated diaphragm assemblies are welded into the metal corrugated diaphragm box by rotating and adjusting the adjusting nut 2 to make the outer edge planes of the two corrugated diaphragm assemblies tightly fit through the butt joint setting of the second step groove 31 in the positioning body two 3 and the first step groove 21 in the adjusting nut 2.

[0065] As Figure 3As shown, when the corrugated diaphragm assembly is assembled by positioning body two 3, the corrugated diaphragm 6 in it is placed in the second step groove 31 of the positioning body two 3, the rod body is located in the second through hole 32 of the positioning body two 3, and the outermost circle corrugated edge of the corrugated diaphragm 6 is in contact with the inner edge of the top end of the second step groove 31. The positioning body two 3 assembled with the corrugated diaphragm assembly is matched with another corrugated diaphragm assembly assembled by the positioning body one 1 and the adjusting nut 2, the two step grooves are arranged in abutment, the two corrugated diaphragm assemblies are coaxial, and the outer edge planes of the two corrugated diaphragm assemblies are tightly matched, so that the welding operation of the bellows can be performed.

[0066] The welding tool for the metal corrugated diaphragm bellows provided by the embodiment of the present application has the following beneficial effects:

[0067] On the one hand, the combination of the positioning body one 1 and the adjusting nut 2 is used to assemble the corrugated diaphragm 6 and the center jack 5 to be welded, so that the outermost circle corrugated edge of the corrugated diaphragm 6 is in contact with the inner edge of the top end of the first step groove 21 of the adjusting nut 2, and the position of the corrugated diaphragm 6 is adjusted by rotating the adjusting nut 2 to achieve the requirement of accurate assembly before welding, and the coaxiality of the corrugated diaphragm 6 and the center jack 5 is ensured.

[0068] On the other hand, the positioning body two 3 is used to assemble a corrugated diaphragm assembly that has been welded, the outermost circle corrugated edge of the corrugated diaphragm 6 in the corrugated diaphragm assembly is in contact with the inner edge of the top end of the second step groove 31 of the positioning body two 3, and the assembled combination (i.e., the assembled combination of the positioning body one 1 and the adjusting nut 2) of another corrugated diaphragm assembly that has been welded is used in cooperation, so that the welding of the metal corrugated diaphragm bellows is implemented, which is beneficial to improving the welding clamping positioning precision of the metal corrugated diaphragm bellows, reducing the assembly gap, ensuring the welding size precision of the corrugated diaphragm assembly and the metal corrugated diaphragm bellows, guaranteeing the product quality consistency, and improving the work efficiency and product qualification rate.

[0069] On the other hand, the welding tool structure provided by the embodiment of the present application is exquisite and simple to operate, can ensure that the assembly precision of the unwelded corrugated diaphragm meets the welding requirement, improve the work efficiency, and reduce the product scrapping problem, and has great technical progress and significant technical effects.

[0070] Based on the welding tool for the metal corrugated diaphragm bellows provided by the above-mentioned embodiments of the present application, the embodiment of the present application further provides a welding method for the metal corrugated diaphragm bellows, and the welding method provided by the embodiment of the present application is executed by using the welding tool for the metal corrugated diaphragm bellows provided by the above-mentioned embodiments, and the implementation mode of the welding tool includes:

[0071] The combination of the adjusting nut 2 and the positioning body one 1 is used to assemble a center top rod 5 and a corrugated diaphragm 6, and the center top rod 5 top end welding part and the corrugated diaphragm 6 bottom end center face are connected by spot welding to form a corrugated diaphragm assembly; two corrugated diaphragm assemblies are formed by the above assembly and welding mode;

[0072] The combination of the adjusting nut 2 and the positioning body one 1 is used to assemble a corrugated diaphragm assembly, another corrugated diaphragm assembly is assembled by the positioning body two 3, and the two corrugated diaphragm assemblies are connected by spot welding after being connected by the adjusting nut 2 and the positioning body two 3 to form a metal corrugated diaphragm box.

[0073] The specific implementation process of the welding method provided by the embodiment of the present application is described as follows:

[0074] As shown in Figure 2 and Figure 3 Before the corrugated diaphragm box 4 is welded, the corrugated diaphragm assembly needs to be processed first, and the processing mode includes the following steps 1 to step 4.

[0075] Step 1, the adjusting nut 2 and the positioning body one 1 are connected, and the combination of the adjusting nut 2 and the positioning body one 1 is used as a spot welding electrode and is installed at the lower electrode interface position of the capacitor energy storage spot welding machine;

[0076] Step 2, the center top rod 5 is erected on the top end of the positioning body one 1 through the top end welding part, the rod body is placed in the first through hole 11 of the positioning body one 1, and the corrugated diaphragm 6 is placed in the first step groove 21 of the adjusting nut 2;

[0077] The assembly requirement of this step is that the outermost circle of the corrugated diaphragm 6 is in contact with the inner edge of the top end of the first step groove 21, and the corrugated diaphragm 6 and the center top rod 5 are coaxial.

[0078] Step 3, the position of the adjusting nut 2 and the positioning body one 1 is adjusted by rotating, so that the bottom end center face of the corrugated diaphragm 6 is in complete contact with the top end welding part of the center top rod 5, and the corrugated diaphragm 6 and the center top rod 5 are always coaxial, at this time, the corrugated diaphragm 6 and the center top rod 5 are spot welded to form a corrugated diaphragm assembly.

[0079] The assembly mode of the above steps 1 to 3 can meet the size requirement and the welding quality requirement of the corrugated diaphragm assembly.

[0080] Step 4, another corrugated diaphragm assembly is welded by repeating steps 1 to 3.

[0081] After the welding of the two corrugated diaphragm assemblies is completed, the above assembly combination can be used to weld the metal diaphragm box with the positioning body two 3, as Figure 3The welding schematic diagram comprises the following steps:

[0082] Step 5, the combination of the positioning body 1 and the adjusting nut 2 is installed on the horizontal position chuck of the vacuum electron beam welding machine, the rod body of one corrugated diaphragm assembly is installed in the first through hole 11 of the positioning body 1, the rod body of another corrugated diaphragm assembly is installed in the second through hole 32 of the positioning body 2, the first step groove 21 of the adjusting nut 2 is connected with the second step groove 31 of the positioning body 2, the vacuum electron beam welding machine tail seat is tightly pressed on the conical hole at the end of the positioning body 2, the outer edge plane of the two corrugated diaphragm assemblies is tightly matched by rotating the adjusting nut 2, and vacuum electron beam welding is carried out.

[0083] By using the above assembly mode for welding, a high-quality metal corrugated diaphragm box can be obtained.

[0084] Although the embodiments of the present application are disclosed as above, the content described is only the embodiments adopted for facilitating the understanding of the present application, and is not used to limit the present application. Any person skilled in the art of the present application can make any modification and change in the implementation form and details without departing from the spirit and scope of the present application, but the patent protection scope of the present application shall be subject to the scope defined by the appended claims.

Claims

1. A welding fixture for a metal bellows, characterized by, The utility model relates to a welding tool for metal corrugated film box, including: Positioning body one (1), adjusting nut (2), positioning body two (3); Wherein, the positioning body one (1) is set to cylindrical structure, and the cylindrical surface is provided with external thread, and both ends are provided with coaxial columnar boss, and the first through -hole (11) of the positioning body one (1) central axis position is opened through both ends columnar boss, and the boss of both ends of the positioning body one (1) is small boss, and the other end is big boss; The adjusting nut (2) is set to cylindrical sleeve structure with internal thread, is connected with the positioning body one (1) coaxial thread, and the first step groove (21) is opened on the side end face of the adjusting nut (2), and the first step groove (21) with the small boss of the positioning body one (1) is located on the same side; The positioning body two (3) is set to columnar structure with step, and the second step groove (31) is opened on the end face of the big end cylinder, and the taper hole is opened on the end face of the small end cylinder, and the second through -hole (32) of the positioning body two (3) central axis position is opened through the whole; After the adjusting nut (2) is connected in the outside of the positioning body one (1), the relative position of the end face of the one end of the step groove of the adjusting nut (2) and the end face of the same side columnar boss of the positioning body one (1) is adjusted by the screwing position adjustment of the screw joint of the adjusting nut (2) and the positioning body one (1);The outer diameter of the adjusting nut (2) is equal to the outer diameter of the big end cylinder in the positioning body two (3);And the inner diameter of the first step groove (21) in the adjusting nut (2) is equal to the inner diameter of the second step groove (31) in the big end cylinder of the positioning body two (3); When the screw joint combination of the adjusting nut (2) and the positioning body one (1) is welded in the corrugated film assembly, the end face of the first step groove (21) in the adjusting nut (2) is higher than the end face of the same side boss in the positioning body one (1); The center top rod (5) to be welded is erected on the top end of the small boss of the positioning body one (1) through the top end welding part thereof, and the rod body is arranged in the first through -hole (11) of the positioning body one (1);The corrugated film piece (6) to be welded is placed in the first step groove (21) of the adjusting nut (2), so that the outermost circle corrugated edge of the corrugated film piece (6) is in contact with the inner edge of the top end of the first step groove (21).

2. The welding tool for metal corrugated film box according to claim 1, wherein, The gap between the bottom end center surface of the corrugated film piece (6) and the top end welding part of the center top rod (5) is adjusted by rotating the screwing position of the adjusting nut (2) and the positioning body one (1), and the coaxial center of the corrugated film piece (6) and the center top rod (5) is kept.

3. The welding tool for metal corrugated film box according to claim 1, wherein, The welding tool of the metal corrugated film box is used for placing and assembling a corrugated film piece (6) and a center top rod (5) through the combination of an adjusting nut (2) and a positioning body one (1), so as to complete the welding of a corrugated film piece assembly, another corrugated film piece assembly is placed through the positioning body two (3), and the welding of the metal corrugated film box is completed through the butt joint of the opening of the first step groove (21) in the adjusting nut (2) and the second step groove (31) in the positioning body two (3).

4. A method of welding a metal bellows box, characterized by, The welding method is performed by using the welding tool of the metal corrugated film box according to any one of claims 1-3, comprising: An adjusting nut (2) and a positioning body one (1) are combined to assemble one center top rod (5) and one corrugated film piece (6), and the center top rod (5) top end welding part and the corrugated film piece (6) bottom end center surface are connected by the assembly structure, forming a corrugated film piece assembly; two corrugated film piece assemblies are formed by using the above assembly and welding method; An adjusting nut (2) and a positioning body one (1) are combined to assemble one corrugated film piece assembly, another corrugated film piece assembly is assembled by using the positioning body two (3), and the welding of the two corrugated film piece assemblies is implemented after butt joint of the adjusting nut (2) and the positioning body two (3), forming a metal corrugated film box (4).

5. The method of welding a metal bellows box according to claim 4, wherein Specifically comprising: Step 1, the adjusting nut (2) and the positioning body one (1) are screwed together, and the combination of the adjusting nut (2) and the positioning body one (1) is installed as a spot welding electrode at the lower electrode interface position of the capacitor energy storage spot welding machine; Step 2, the center top rod (5) is erected on the small boss top end of the positioning body one (1) through the top end welding part, the rod body is placed in the first through hole (11) of the positioning body one (1), and the corrugated film piece (6) is placed in the first step groove (21) of the adjusting nut (2); Step 3, the screwing position of the adjusting nut (2) and the positioning body one (1) is rotated, so that the corrugated film piece (6) bottom end center surface and the center top rod (5) top end welding part are in complete contact, and the corrugated film piece (6) and the center top rod (5) are coaxial, the assembled corrugated film piece (6) and the center top rod (5) are spot welded, and a corrugated film piece assembly is formed; Step 4, another corrugated film piece assembly is welded by repeating steps 1-3; Step 5, the combination of the adjusting nut (2) and the positioning body one (1) is installed on the horizontal position chuck of the vacuum electron beam welder, the rod body of one corrugated film piece assembly is installed in the first through hole (11) of the positioning body one (1), the rod body of another corrugated film piece assembly is installed in the second through hole (32) of the positioning body two (3), the first step groove (21) of the adjusting nut (2) and the second step groove (31) of the positioning body two (3) are butt jointed, and the vacuum electron beam welder tail seat is tightly pressed on the taper hole at the end of the positioning body two (3), the outer edge plane of the two corrugated film piece assemblies is tightly matched by rotating the adjusting nut (2), vacuum electron beam welding is performed, and a high-quality metal corrugated film box (4) with a good weld is obtained.

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