Resistance welding tool, resistance welding machine and method for cathode assembly

Abstract

The invention provides a resistance welding tool, a resistance welding machine and a method for a cathode assembly, the cathode assembly comprises a cathode and a heater, one end of the heater is connected with the cathode, the heater is used for being welded with a transition piece, and the resistance welding tool comprises a conductive support; the fixing piece is arranged on the conductive support; the electrode plate is arranged on the conductive support; the fixing piece is used for fixing the cathode assembly; the conductive support comprises a middle part and two side parts connected to the two ends of the middle part; the fixing piece penetrates through the middle part in the horizontal direction and extends to the position between the two side parts. The electrode plate is fixed between the two side parts; the fixing piece is configured to enable the heater connected to the cathode to extend in the horizontal direction, and a spacing space used for containing the transition piece is formed between the heater and the electrode plate in the vertical direction. The tool can improve the consistency of the welding quality of the heater and the transition piece, and is convenient to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of the manufacture of electro-vacuum devices. More specifically, it relates to a resistance welding tooling, a resistance welding machine and a method for a cathode assembly. Background Art

[0002] Vacuum electronic devices generally require a cathode, which serves to provide electrons during the operation of the device and is the core component of the device. The failure of the cathode will cause the scrapping of the device. At present, the vast majority of cathodes are hot cathodes, which are characterized by the need for a relatively high temperature during operation, usually above 1000 degrees Celsius. Generally, refractory metal resistance heating is used to heat the cathode, and the wire made of refractory metal is generally called a heater. The heater generally has a diameter of about 0.1 mm and is easily damaged by stress, so it is not directly connected to other parts of the device. Usually, a metal with better ductility, such as platinum or tantalum, is used for transition, and the cooperation method is as Figure 1 shown. The connection between the transition piece and the heater is made by resistance welding, and generally, a manual welding pliers method is used, as Figure 2 shown. However, the use of manual welding pliers has the following main disadvantages: First, the welding pressure is not controlled, and the contact resistance between the electrode and the heater, the transition piece, and between the transition piece and the heater is unstable, resulting in uncertain heat distribution between various interfaces during the welding process and poor consistency of welding quality. In addition, if too much heat is distributed between the electrode and the welded part, the electrode will adhere to the workpiece. The electrode material is generally copper, and during the operation of the device, copper will evaporate due to heat, which will affect the operation of the cathode. Second, the operation is very difficult. The sizes of the heater and the transition piece are very small, and the relative positions need to be found correctly under a microscope, which requires a high level of ability for the operator. Summary of the Invention

[0003] In view of the above problems, the present invention provides a resistance welding tooling for a cathode assembly to improve the consistency of the welding quality between the heater and the transition piece and to facilitate the operation.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention provides a resistance welding tooling for a cathode assembly. The cathode assembly includes a cathode and a heater connected to one end of the cathode for welding with a transition piece. The resistance welding tooling is characterized in that it includes:

[0006] a conductive support; a fixing member disposed on the conductive support; and an electrode sheet disposed on the conductive support; the fixing member is used for fixing the cathode assembly;

[0007] The conductive support includes a middle part and two side parts connected to both ends of the middle part; the fixing member penetrates through the middle part in the horizontal direction and extends between the two side parts; the electrode plate is fixed between the two side parts; the fixing member is configured to enable the hot wire connected to the cathode to extend in the horizontal direction and form a spaced space for placing the transition member between the electrode plate in the vertical direction.

[0008] Preferably, the adjacent sides of the two side parts are the inner sides, and clamping structures are formed on the inner side walls of the ends of the side parts;

[0009] The clamping structure includes an upper clamping arm and a lower clamping arm arranged at intervals in the vertical direction; the electrode plate is fixed between the upper clamping arm and the lower clamping arm.

[0010] Preferably, a threaded hole penetrating through the upper clamping arm in the vertical direction is formed on the upper clamping arm; the resistance welding tooling further includes a fastening screw for cooperating with the threaded hole; the electrode plate is fixed between the upper clamping arm and the lower clamping arm by screwing and cooperating with the threaded hole through the fastening screw.

[0011] Preferably, the fixing member includes a fixing ring fixed to the conductive support, a rotating shaft rotatably arranged inside the fixing ring, and a positioning structure fixed to the rotating shaft for fixing the cathode; a through hole is formed in the middle part; the fixing ring is fixed at the position of the through hole and the rotating shaft passes through the through hole so that the positioning structure is located between the two side parts.

[0012] Preferably, the positioning structure includes a fixing shaft coaxially arranged with the rotating shaft and a locking nut; the end of the fixing shaft away from the rotating shaft includes a three-lobe structure; the three-lobe structure is used to accommodate the cathode; an external thread is formed on the fixing shaft; the locking nut is screwed onto the fixing shaft; a cap hole for the hot wire to extend out is formed on the locking nut.

[0013] Preferably, the rotating shaft is made of stainless steel, and the fixing ring is made of resin or stainless steel.

[0014] Preferably, the conductive support is made of copper or copper alloy.

[0015] Preferably, the conductive support is a hollow structure.

[0016] The present invention also provides a resistance welding machine, including the resistance welding tooling as described above, a resistance welding table, and an upper electrode; the resistance welding tooling is fixed on the resistance welding table, and the upper electrode is located above the resistance welding tooling and can press down the hot wire in the vertical direction.

[0017] The present invention also provides a hot wire resistance welding method based on the resistance welding machine as described above, including the following steps:

[0018] Fix the cathode assembly to the resistance welding fixture so that there is a spacing space for placing the transition piece between the heater and the electrode piece in the vertical direction;

[0019] Place the transition piece in the spacing space between the heater and the electrode piece;

[0020] Position the resistance welding fixture on the resistance welding table;

[0021] Start the resistance welder. The resistance welding table and the upper electrode are both powered on. Drive the upper electrode to descend so that the lower end of the upper electrode presses down on the heater to weld the heater and the transition piece.

[0022] The beneficial effects of the present invention are as follows:

[0023] The present invention provides a special fixture for resistance welding of a heater and a transition piece. Through the coordinated cooperation of a conductive support, a fixing piece, and an electrode piece, precise positioning and stable fixation of the heater are achieved. Specifically, the heater is fixed above the electrode piece, and an accurate spacing space is formed between the heater and the electrode piece in the vertical direction, which is specifically used for placing the transition piece. After the electrode piece is powered on through the conductive support, with its bearing function and the pressing action of the upper electrode, the heater and the transition piece are tightly pressed together, and a constant welding pressure is maintained, thereby ensuring the stability and consistency of the resistance welding quality.

[0024] Compared with the traditional hand-held welding torch process, the resistance welding fixture of the present invention has significant advantages. First, through the stable fixation of the heater by the fixture, the reliability and consistency of the welding quality are effectively improved, which has an important promoting effect on the overall performance of the vacuum device. Second, this fixture simplifies the alignment operation process of the heater and the transition piece: the operator only needs to stably fix the cathode assembly to the fixture, and then place the transition piece at the predetermined position between the electrode piece and the heater, without the need for the cumbersome and precise alignment required by the traditional hand-held welding torch. After the cathode assembly is fixed, only the position of the fixture needs to be slightly adjusted to complete all the positioning work, greatly reducing the operation difficulty and improving the production efficiency.

[0025] The fixture design not only solves the problems of insufficient positioning accuracy and unstable welding pressure existing in the traditional welding process, but also provides a reliable process guarantee for the mass production of vacuum devices, and has important industrial application value. Description of the Drawings

[0026] The following further elaborates in detail the specific implementation manners of the present invention in conjunction with the drawings.

[0027] Figure 1 It is a schematic diagram of the cooperation between the cathode assembly and the transition piece.

[0028] Figure 2 It is a schematic diagram of the existing welding using a hand-held welding torch.

[0029] Figure 3 It is a schematic structural diagram of the resistance welding tooling of the present invention.

[0030] Figure 4 It is an assembly schematic diagram of the resistance welding tooling of the present invention.

[0031] Figure 5 It is a schematic diagram of the cooperation between the resistance welding tooling of the present invention and the upper electrode.

[0032] Reference numerals: 1, conductive support; 2, fixing member; 3, electrode piece; 11, middle part; 12, side part; 13, clamping structure; 14, threaded hole; 15, through hole; 21, fixing ring; 22, rotating shaft; 23, fixing shaft; 24, locking nut; 25, cap hole; 26, three-lobe structure; 4, upper electrode; 5, cathode assembly. Detailed Description of the Invention

[0033] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present invention or its application or use.

[0035] Techniques and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques and devices should be regarded as part of the specification.

[0036] In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0037] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0038] In order to solve the problems existing in the prior art, the present invention provides a resistance welding tooling for a cathode assembly, in combination with Figures 1 to 5As shown, the cathode assembly 5 includes a cathode and a heater with one end connected to the cathode. The end of the heater away from the cathode is used to be welded and fixed to the transition piece by resistance welding. The transition piece is generally a platinum strip or a tantalum strip, so it can also be called a transition strip. This resistance welding tooling is used to realize the resistance welding between the heater and the transition piece. Specifically, the resistance welding tooling for the cathode assembly includes: a conductive support 1 with good electrical conductivity; a fixing member 2 rotatably arranged on the conductive support 1; and an electrode plate 3 arranged on the conductive support 1. The electrode plate 3 serves as the lower electrode during the resistance welding of the heater and the transition piece, and plays a role in supporting the transition piece and the heater. The fixing member 2 is used to fix the cathode. The conductive support 1 includes an intermediate portion 11 and two spaced side portions 12 connected to both ends of the intermediate portion; the fixing member 2 penetrates the intermediate portion 11 in the horizontal direction and extends between the two side portions 12. The electrode plate 3 is fixed between the two side portions 12. The fixing member 2 is configured to enable the heater connected to the cathode to extend in the horizontal direction and form a spaced space for placing the transition piece between the heater and the electrode plate in the vertical direction. That is to say, the fixing member 2 enables the projection of at least the end of the heater away from the cathode in the vertical direction to cover the surface area of the electrode plate 3. Usually, two heaters are correspondingly connected to one cathode. By using the tooling of the present invention, the two heaters can be respectively located on the upper and lower sides of the electrode plate 3 and are both spaced from the electrode plate 3 so that the heater located above the electrode plate 3 can perform the resistance welding operation with the transition strip. Since the two heaters on the cathode assembly 5 are parallel to each other, the spacing is generally 2 mm, and each heater needs to be welded with a transition piece, and the two transition pieces also need to be parallel to each other. If the existing resistance welding machine is directly used for welding, it will cause interference between the two heaters. Therefore, it is necessary to rely on the tooling of the present invention to achieve good welding between the heater and the transition piece. Further, through the cooperation of the conductive support 1, the fixing member 2 and the electrode plate 3, the present invention fixes the heater above the electrode plate 3, forms a spaced space for placing the transition piece between the heater and the electrode plate 3 in the vertical direction. The electrode plate is energized through the conductive support 1, and the upper electrode 4 carrying the transition piece is pressed down on the heater by using the electrode plate 3, so that the heater and the transition piece are pressed together and the welding pressure between the two is kept fixed, thereby completing the resistance welding between the heater and the transition piece and ensuring the consistency of the welding quality. Compared with the traditional hand-held welding tongs, the resistance welding tooling of the present invention can better ensure the welding quality through the stable fixation of the heater by the tooling of the present invention, and greatly improves the reliability of the vacuum device. And by using this tooling, the alignment operation between the heater and the transition piece can be more convenient. It only needs to first stably fix the cathode assembly on the tooling, and then place the transition piece between the electrode plate and the heater, without the need for manual precise alignment like the traditional hand-held welding tongs. After the cathode assembly 5 is fixed, there is no need to adjust the heater anymore, but only the position of the tooling needs to be adjusted, thereby further reducing the operation difficulty.

[0039] In the above embodiments, the conductive support 1 serves as the installation base for other components of the tooling. To facilitate the subsequent installation of other components, the conductive support 1 is designed as a hollow structure.

[0040] In a specific embodiment, the conductive support 1 has a U-shaped structure. The adjacent sides of its two side portions 12 are the inner sides. A clamping structure 13 is formed on the inner side wall of the end of the side portion 12. The clamping structure 13 includes an upper clamping arm and a lower clamping arm that are spaced apart in the vertical direction. The electrode plate 3 is fixed between the upper clamping arm and the lower clamping arm. The conductive support 1 is made of copper or copper alloy to ensure good current conduction performance. The width, height, and thickness of the U-shaped structure are designed according to specific application scenarios. The distance between the upper clamping arm and the lower clamping arm is adjusted according to the thickness of the electrode plate 3 to ensure that the electrode plate 3 can be firmly clamped and will not be damaged due to excessive tightness.

[0041] Furthermore, a threaded hole 14 that penetrates the upper clamping arm in the vertical direction is formed on the upper clamping arm. The resistance welding tooling further includes a fastening screw for cooperating with the threaded hole 14. The electrode plate 3 is fixed between the upper clamping arm and the lower clamping arm by screwing the fastening screw into the threaded hole 14. Specifically, a threaded hole 14 that penetrates vertically is machined on the upper clamping arm. The resistance welding tooling is also equipped with a fastening screw that cooperates with the threaded hole 14. By screwing the fastening screw into the threaded hole 14, the electrode plate 3 can be firmly fixed between the upper clamping arm and the lower clamping arm. The method of fixing with a fastening screw facilitates the disassembly and maintenance of the electrode plate. The contact surface between the electrode plate 3 and the clamping arm is flattened to ensure good electrical contact. It can be understood that clamping structures 13 are formed on the inner side walls of the ends of both side portions 12, and the two clamping structures 13 clamp and fix the electrode plate 3 from two opposite sides of the electrode plate 3.

[0042] In a specific embodiment, the fixing member 2 includes a fixing ring 21 fixed to the conductive support 1, a rotating shaft 22 rotatably disposed inside the fixing ring 21, and a positioning structure fixed to the rotating shaft 22 for fixing the cathode. The fixing ring 21 can be integrally formed with the conductive support 1 or fixed to the conductive support 1 by means of machine screws, bonding, welding, etc. A through hole 15 is formed in the middle portion 11; the fixing ring 21 is fixed at the position of the through hole 15 and the rotating shaft 22 passes through the through hole 15 so that the positioning structure is located between the two side portions 12. A bearing fit is provided between the fixing ring 21 and the rotating shaft 22 to achieve relative rotational movement. The fixing ring 21 is precisely fixed at the position of the through hole 15, and the rotating shaft 22 passes through the through hole 15, so that the positioning structure is exactly located between the two side portions 12, and the fixing ring 21 and the positioning structure are respectively located on the two opposite sides of the middle portion 11. To ensure smooth rotation of the rotating shaft 22, the diameter of the rotating shaft 22 is designed to be not greater than the inner diameter of the through hole 15. The above structure not only ensures the stability of the component fit but also ensures the flexibility of the rotational movement of the rotating shaft 22. The material of the rotating shaft 22 is stainless steel, and the material of the fixing ring 21 is resin or stainless steel. The rotating shaft 22 can rotate 360 degrees around its own axis. By adjusting the axial relative position of the rotating shaft 22 and the fixing ring 21, the welding requirements of different model products can be adapted.

[0043] Further, regarding the positioning structure, the positioning structure includes a fixing shaft 23 coaxially arranged with the rotating shaft 22 and a locking nut 24; the end of the fixing shaft 23 away from the rotating shaft 22 includes a three-lobe structure 26; the three-lobe structure 26 is used to accommodate the cathode; an external thread is formed on the fixing shaft 23; the locking nut 24 is screwed onto the fixing shaft 23; a cap hole 25 for the heating element to extend out is formed on the locking nut 24. The cathode is locked and fixed on the fixing shaft 23 by the cooperation of the three-lobe structure 26 and the locking nut 24 to ensure the stability of the cathode fixation. The heating element extends above and below the electrode plate 3 from the cap hole 25 of the locking nut 24, and the material of the locking nut 24 can be stainless steel. By utilizing the easily deformable characteristic of the three-lobe structure 26, it is convenient to fasten the cathode assembly 5 to the end of the fixing shaft 23 by tightening the locking nut 24.

[0044] The present invention also provides a resistance welding machine, which includes the resistance welding tooling as described above, a resistance welding table, and an upper electrode 4; the resistance welding tooling is fixed on the resistance welding table, and the upper electrode 4 is located above the resistance welding tooling and can press down the heating element in the vertical direction. By using this resistance welding machine, the welding pressure can be controlled, the consistency of the welding quality can be improved, and the operation is simple, reducing the requirements for the operators.

[0045] In addition, the present invention also provides a hot-electrode resistance welding method based on the above-mentioned resistance welding machine. The method includes the following steps: fixing the cathode assembly 5 on the resistance welding fixture, so that a spacer space for placing a transition piece is formed between the hot electrode and the electrode piece 3 in the vertical direction; placing the transition piece in the spacer space between the hot electrode and the electrode piece 3; positioning the resistance welding fixture on the resistance welding table; starting the resistance welding machine, energizing both the resistance welding table and the upper electrode 4, and driving the upper electrode 4 to descend so that the lower end of the upper electrode 4 presses the hot electrode to weld the hot electrode and the transition piece. The above-mentioned resistance welding table is a lower electrode platform.

[0046] More specifically, fix the electrode piece 3 on the conductive support 1. Orient the cathode surface of the cathode towards the fixed shaft 23 and place the cathode into the three-lobe structure 26 at the end of the fixed shaft 23. Tighten the locking nut 24 on the fixed shaft 23 to finally fix the cathode assembly 5. Pass the fixture 2 with the cathode assembly 5 installed through the through hole 15 on the conductive support 1, so that the two hot electrodes on the cathode assembly 5 are respectively located on the upper and lower sides of the electrode piece 3. Place a transition belt between the hot electrode on the upper side of the electrode piece 3 and the electrode piece 3, and adjust the position of the transition belt through the visual assistance device so that the end of the hot electrode is located at the center of the transition belt. Place the fixture with the cathode assembly 5 fixed on the lower electrode platform of the resistance welding machine with positioning function, start the resistance welding machine, and the upper electrode 4 descends to press the hot electrode and the transition belt for welding. After the welding of the hot electrode on one side of the electrode piece 3 is completed, turn the entire fixture 180 degrees so that the other hot electrode is located on the upper side of the electrode piece 3, and repeat the above steps to weld the other hot electrode. After the welding of both hot electrodes is completed, remove the fixture 2 from the conductive support 1, loosen the locking nut 24, and remove the cathode assembly 5 from the fixed shaft 23 for subsequent assembly.

[0047] The following gives the specific structural dimensions of the fixture of the present invention: the outer dimensions of the conductive support 1 are 60mm * 50mm * 40mm; the diameter of the through hole 15 is 20mm; the distance between the upper clamping arm and the lower clamping arm is 2mm; the outer diameter of the fixing ring 21 is 30mm; the diameter of the rotating shaft 22 is 20mm; the outer diameter of the fixed shaft 23 is 8mm; the inner diameter of the locking nut 24 is 8mm; the thickness of the electrode piece 3 is 2mm.

[0048] Furthermore, the tensile test method was used to conduct a comparative study on the strength of the resistance welding tooling of the present invention and the manual welding pliers at the welding point of the heater - transition band. The test selected a heater with a diameter of 0.14 mm and a nickel sheet transition band with a specification of 1 mm (width) × 0.1 mm (thickness) as the welding specimen. After welding was completed under the same process parameters, tensile tests were respectively carried out on the specimens prepared by the two welding methods, and the maximum tensile force value at the moment of the welding point fracture was used as the evaluation index of the welding strength. 10 specimens were prepared for each method for comparative testing. The comparison of the experimental results in Table 1 and Table 2 shows that the welding points obtained by using the novel resistance welding tooling of the present invention are significantly superior to the traditional manual welding pliers welding process in terms of strength consistency. The pressure at the moment of fracture of the welding points of the present invention is between 8.1 N and 8.6 N, and the variance of the data is 0.0269. The strength of the welding points of the existing manual welding pliers welding method is relatively discrete, and the data variance is 0.9545, indicating that the welding quality consistency of using the tooling of the present invention is better.

[0049] Table 1 Welding Point Strength Data of Using the Tooling of the Present Invention

[0050]

[0051] Table 2 Welding Point Strength Data of Using the Existing Manual Welding Pliers

[0052]

[0053] In summary, the present invention provides a special tooling for resistance welding of heaters and transition parts. Through the coordinated cooperation of the conductive support, the fixing part and the electrode piece, the precise positioning and stable fixation of the heater are realized. Specifically, the heater is fixed above the electrode piece, and an accurate spacing space is formed between the heater and the electrode piece in the vertical direction, and this space is specifically used to place the transition part. After the electrode piece is energized through the conductive support, with its bearing function and the downward pressing action of the upper electrode, the heater and the transition part are tightly pressed together, and a constant welding pressure is maintained, thereby ensuring the stability and consistency of the resistance welding quality.

[0054] Compared with the traditional hand - held welding pliers process, the resistance welding tooling of the present invention has significant advantages. First, through the stable fixation of the heater by the tooling, the reliability and consistency of the welding quality are effectively improved, which has an important promoting effect on the overall performance of the vacuum device. Second, this tooling simplifies the alignment operation process of the heater and the transition part: the operator only needs to stably fix the cathode assembly on the tooling, and then place the transition part at the predetermined position between the electrode piece and the heater, without the need for the cumbersome and precise alignment required by the traditional manual welding pliers. After the cathode assembly is fixed, only the position of the tooling needs to be slightly adjusted to complete all the positioning work, greatly reducing the operation difficulty and improving the production efficiency.

[0055] This tooling design not only solves the problems existing in traditional welding processes, such as insufficient positioning accuracy and unstable welding pressure, but also provides reliable process guarantees for the mass production of vacuum devices, having important industrial application value.

[0056] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, based on the above description, other different forms of changes or modifications can be made. It is impossible to list all the implementation manners here. Any obvious changes or modifications derived from the technical solutions of the present invention still fall within the protection scope of the present invention.

Claims

1. A resistance welding tool for a cathode assembly, the cathode assembly comprising a cathode and a heater connected to the cathode at one end for welding with a transition piece, characterized in that: The resistance welding tool includes: A conductive support; a fixing member disposed on the conductive support; and an electrode sheet disposed on the conductive support; the fixing member is used to fix the cathode assembly; The conductive support includes a middle part and two side parts connected to both ends of the middle part; the fixing piece passes through the middle part in the horizontal direction and extends between the two side parts; the electrode sheet is fixed between the two side parts; the fixing piece is configured to enable the heater connected to the cathode to extend in the horizontal direction and form a spacing space between the heater and the electrode sheet in the vertical direction for placing a transition piece.

2. The resistance welding tool for cathode assembly according to claim 1, characterized in that: The adjacent sides of the two side parts are inner sides, and a clamping structure is formed on the inner side wall of the end of the side part; The clamping structure comprises an upper clamping arm and a lower clamping arm which are arranged at intervals in the vertical direction; the electrode sheet is fixed between the upper clamping arm and the lower clamping arm.

3. The resistance welding tool for cathode assembly according to claim 2, characterized in that: The upper clamp arm is formed with a threaded hole which passes through the upper clamp arm in the vertical direction; the resistance welding tool also includes a fastening screw for matching with the threaded hole; the electrode sheet is fixed between the upper clamp arm and the lower clamp arm by screwing the fastening screw with the threaded hole.

4. The resistance welding tool for cathode assembly according to claim 1, characterized in that: The fixing member includes a fixing ring fixed to a conductive support, a rotating shaft rotatably arranged inside the fixing ring, and a positioning structure fixed to the rotating shaft for fixing the cathode; a through hole is formed in the middle portion; the fixing ring is fixed at the position of the through hole and the rotating shaft passes through the through hole so that the positioning structure is located between the two side portions.

5. The resistance welding tool for cathode assembly according to claim 4, characterized in that: The positioning structure includes a fixed shaft and a locking nut coaxially arranged with the rotating shaft; the end of the fixed shaft away from the rotating shaft includes a three-petal structure; the three-petal structure is used to accommodate the cathode; an external thread is formed on the fixed shaft; the locking nut is screwed on the fixed shaft; and a cap hole is formed on the locking nut for the heater to extend from.

6. The resistance welding tool for cathode assembly according to claim 4, characterized in that: The rotating shaft is made of stainless steel, and the fixing ring is made of resin or stainless steel.

7. The resistance welding tool for cathode assembly according to claim 1, characterized in that: The conductive support is made of copper or copper alloy.

8. The resistance welding tool for cathode assembly according to claim 1, characterized in that: The conductive support is a hollow structure.

9. A resistance welding machine, characterized in that: It comprises the resistance welding tool as described in any one of claims 1 to 8, a resistance welding table and an upper electrode; the resistance welding tool is fixed on the resistance welding table, and the upper electrode is located above the resistance welding tool and can press the heater downward in the vertical direction.

10. A thermal resistance welding method based on the resistance welding machine according to claim 9, characterized in that: The following steps are involved: Fix the cathode assembly on the resistance welding tooling so that a spacing space for placing the transition piece is formed between the heater and the electrode sheet in the vertical direction; Place a transition piece in the space between the heater and the electrode; Position the resistance welding tool on the resistance welding table; The resistance welding machine is started, the resistance welding table and the upper electrode are energized, and the upper electrode is driven down so that the lower end of the upper electrode presses down the heater to weld the heater and the transition piece.

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