Resistance welding apparatus and welding method

Abstract

This invention discloses a resistance welding device and a welding method. The resistance welding device includes a frame and an inner electrode assembly. The inner electrode assembly includes an inner electrode shell, several movable electrode units, and a movable triggering component. The triggering component is movably connected to the movable electrode units. Movement of the triggering component can push the multiple movable electrode units away from each other by the same amplitude, so that the inner electrodes on the multiple movable electrode units simultaneously abut against the inner electrode shell. In this invention, the workpiece is fitted onto the inner electrode shell. Initially, the inner electrodes on the movable electrode units do not contact the inner electrode shell to ensure safety. At the start of welding, the movable triggering component moves, causing its first inclined surface to gradually contact the second inclined surfaces on each movable electrode unit. The first inclined surface pushes the second inclined surface, causing the movable electrode units to move away from each other by the same amplitude until the inner electrodes abut against the inner electrode shell, thus completing the resistance welding process.

Description

Technical Field

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

[0002] Most existing resistance welding equipment is designed for solid structures without cavities. When adding a workpiece, the welding process can begin simply by clamping and positioning the workpiece around its exterior. However, when the workpiece is a hollow structure such as a shell, external clamping alone can easily cause dents on the workpiece surface, damaging the structural integrity of the workpiece. In addition, when resistance welding is required at multiple locations on the workpiece, the constant contact between the electrode and the workpiece reduces safety. If the electrode and workpiece can switch between separation and contact states, it is difficult for electrodes at different locations to contact the workpiece simultaneously, resulting in poor synchronization.

[0003] Chinese patent document CN218461162U discloses an automatic multi-point projection welding device. The workpiece is set on the welding table by external clamping. If the workpiece is welded, it is easy to damage the workpiece. Moreover, it is difficult to ensure the synchronization of movement when the two sets of positive motors and the two sets of negative motors contact the workpiece relatively independently. Summary of the Invention

[0004] To solve at least one of the above-mentioned technical problems, the present invention provides a resistance welding device and a welding method, the technical solution of which is as follows:

[0005] This invention provides a resistance welding device, which includes a frame and an inner electrode assembly. A welding platform is mounted on the frame. The inner electrode assembly is disposed on the welding platform and includes an inner electrode housing, a plurality of movable electrode units, and a movable triggering component. The inner electrode housing is capable of conforming to the inner wall of a workpiece. A plurality of inner electrodes are disposed on each movable electrode unit. Each movable electrode unit and the movable triggering component are disposed inside the inner electrode housing. The triggering component is movably connected to the movable electrode unit. The movement of the movable triggering component can push the plurality of movable electrode units away from each other by the same amplitude, so that the inner electrodes on the plurality of movable electrode units simultaneously abut against the inner electrode housing.

[0006] In some embodiments of the present invention, the active triggering component is provided with a first inclined surface, the active electrode unit is provided with a second inclined surface, the first inclined surface and the second inclined surface are in contact, and the first inclined surface and the second inclined surface are movably connected.

[0007] In some embodiments of the present invention, the active triggering component is provided with two opposing first inclined surfaces, the active triggering component is connected to two active electrode units, and the movement of the active triggering component drives the two active electrode units to move to both sides respectively.

[0008] In some embodiments of the present invention, the welding platform is provided with a movable electrode holder and a fixed electrode holder, and the inner electrode assembly is provided on both the movable electrode holder and the fixed electrode holder.

[0009] In some embodiments of the present invention, both the movable electrode base and the fixed electrode base are provided with a first sliding structure, the first sliding structure is connected to the movable electrode unit, the movable electrode unit is slidably connected to the movable electrode base, and the movable electrode unit is slidably connected to the fixed electrode base.

[0010] In some embodiments of the present invention, a second sliding structure is provided on the welding platform, the second sliding structure is connected to the movable electrode seat, and the movable electrode seat is slidably connected to the welding platform so that the movable electrode seat moves closer to or further away from the fixed electrode seat.

[0011] In some embodiments of the present invention, the resistance welding equipment further includes a lower base plate welding assembly, which is mounted on the frame. The lower base plate welding assembly includes a plurality of pressure mechanisms that are movable to abut against or detach from the workpiece surface.

[0012] In some embodiments of the present invention, the resistance welding equipment further includes an upper base plate welding assembly, which is mounted on the frame. The upper base plate welding assembly includes several pressure mechanisms that are movable to abut against or detach from the workpiece surface.

[0013] In some embodiments of the present invention, the pressurizing mechanism includes a housing and an abutment portion. The housing is disposed on the frame, and the abutment portion extends into the interior of the housing. A third sliding structure is disposed inside the housing and is connected to the abutment portion. The abutment portion can slide closer to or further away from the workpiece surface.

[0014] This invention provides a resistance welding method, applied to the aforementioned resistance welding equipment, comprising:

[0015] Invert the assembled product onto the inner electrode assembly to ensure that the inner wall of the product is in close contact with the inner electrode housing.

[0016] The internal electrode assemblies move relative to each other so that the distance between them is adapted to the length of the internal electrode housing.

[0017] The active triggering component moves, driving each active electrode unit to move away from each other by the same amplitude, until the distance between each active electrode unit adapts to the length of the inner electrode housing, and the inner electrode abuts against the inner electrode housing.

[0018] The resistance welding equipment performs welding on the upper and lower base plates of the product, respectively.

[0019] After welding is completed, all internal electrode assemblies are reset, and the finished workpiece is removed.

[0020] The embodiments of the present invention have at least the following beneficial effects: In the present invention, the workpiece is sleeved on the inner electrode housing, and the shape of the inner electrode housing corresponds to the inner cavity shape of the workpiece, ensuring a large contact area. Under stable positioning, the workpiece is prevented from being damaged due to clamping. The inner electrode on the movable electrode unit does not contact the inner electrode housing in the initial state, ensuring safety. When welding begins, the movable triggering component moves, so that the first inclined surface of the movable triggering component gradually contacts the second inclined surface on each movable electrode unit, forming a movable connection. The first inclined surface pushes the second inclined surface, and each movable electrode unit moves away from each other with the same range of motion until the inner electrode abuts against the inner electrode housing. Then, the resistance welding process is completed under the action of the upper base plate welding assembly and the lower base plate welding assembly.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the resistance welding equipment of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal electrode assembly in the resistance welding equipment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the inner electrode assembly in the resistance welding equipment of the present invention after removing the inner electrode shell;

[0026] Figure 4 This is a left view of the inner electrode assembly in the resistance welding equipment of the present invention after removing the inner electrode housing;

[0027] Figure 5 This is a front view of the inner electrode assembly of the resistance welding equipment of the present invention after removing the inner electrode housing;

[0028] Figure 6 This is a schematic diagram of the pressure mechanism in the resistance welding equipment of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the pressure mechanism in the resistance welding equipment of the present invention for removing the shell.

[0030] Figure label:

[0031] 101. Machine frame; 102. Welding platform;

[0032] 201. Inner electrode assembly; 202. Inner electrode housing; 203. Movable electrode unit; 204. Movable triggering component; 205. First inclined surface; 206. Second inclined surface;

[0033] 301. Movable electrode holder; 302. Fixed electrode holder; 303. First sliding structure; 304. Second sliding structure;

[0034] 401. Lower base plate welding assembly; 402. Upper base plate welding assembly; 403. Pressurizing mechanism; 404. Housing; 405. Abutment part; 406. Third sliding structure. Detailed Implementation

[0035] This section will combine Figures 1 to 7 Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] In the description of this invention, it should be understood that the terms "center," "middle," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Features defined with "first" and "second" are used to distinguish feature names and do not have special meanings. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] like Figure 1 As shown, this embodiment of the invention provides a resistance welding apparatus, which includes a frame 101 and an inner electrode assembly 201. The resistance welding apparatus welds specific workpieces, which include an upper base plate, a lower base plate, and a U-shaped plate. The lower base plate and the upper base plate are respectively embedded into both ends of the U-shaped plate, and welding is performed at both ends of the U-shaped plate to form a finished product. Therefore, the workpiece is located in the middle of the frame 101, facilitating resistance welding at both ends of the workpiece. Furthermore, a welding platform 102 is provided in the middle of the frame 101, on which the workpiece is placed during the welding process.

[0039] like Figure 2 , Figure 3 As shown, the inner electrode assembly 201 is disposed on the welding platform 102. On the one hand, the inner electrode assembly 201 provides an inner electrode for the resistance welding process. On the other hand, it serves as a workpiece clamp, ensuring the stability of the workpiece position while being able to withstand external forces and avoid structural damage to the workpiece caused by external forces.

[0040] Furthermore, the inner electrode assembly 201 includes an inner electrode housing 202, which supports the workpiece inside the workpiece to stabilize the position of the workpiece. It is understood that the outer wall shape of the inner electrode housing 202 corresponds to the inner wall shape of the workpiece, so that the inner electrode housing 202 can be embedded inside the workpiece and there is a large contact area between the inner electrode housing 202 and the workpiece.

[0041] The inner electrode assembly 201 also includes several movable electrode units 203, each located inside the inner electrode housing 202. Each movable electrode unit 203 is equipped with multiple inner electrodes. When the inner electrodes contact the inner electrode housing 202, the contact between the inner electrode housing 202 and the workpiece creates an electrical connection between the inner electrodes and the workpiece, thereby performing resistance welding. It can be understood that the welding position between the U-shaped plate and the lower base plate is the contact position between the U-shaped plate and the lower base plate, i.e., on the three edges of the lower base plate. The welding position between the U-shaped plate and the upper base plate is the contact position between the U-shaped plate and the upper base plate, i.e., on the three edges of the upper base plate. The multiple inner electrodes on the movable electrode unit 203 can correspond to the positions of the three edges of the upper or lower base plate, ensuring the effectiveness of the resistance welding.

[0042] To prevent the inner electrode from contacting the inner electrode housing 202 under normal conditions, which could lead to safety hazards, the movable electrode unit 203 can move inside the inner electrode housing 202. During the movement, the inner electrode and the inner electrode housing 202 switch between contact and disengagement. Furthermore, each group of movable electrode units 203 can move closer to or further away from each other. When they move closer, the inner electrode disengages from the inner electrode housing 202; when they move further away, the inner electrode gradually comes into contact with the inner electrode housing 202.

[0043] The inner electrode assembly 201 also includes a movable triggering component 204, which drives a group of movable electrode units 203 to move. The movable triggering component 204 is disposed inside the inner electrode housing 202 and contacts each of the movable electrode units 203 in the same group. When the movable triggering component 204 moves, it can push each movable electrode unit 203 away from each other, and the movement amplitude of each movable electrode unit 203 away from each other is the same, ensuring that the inner electrode on each movable electrode unit 203 simultaneously abuts against the side of the inner electrode housing 202.

[0044] like Figure 4 As shown, in some examples, the active trigger component 204 is provided with several first inclined surfaces 205, and the active electrode unit 203 is provided with second inclined surfaces 206. Each second inclined surface 206 cooperates with each first inclined surface 205 to form an active connection. Specifically, the inclination angle of each second inclined surface 206 is approximately the same as the inclination angle of each first inclined surface 205. When the second inclined surface 206 cooperates with the first inclined surface 205, a larger contact area can be ensured, making the movement stable and avoiding excessive local force. It can be understood that in order to ensure that the movement amplitude of each active electrode unit 203 is the same, the inclination angle of each first inclined surface 205 is approximately the same. When the active trigger component 204 moves, the first inclined surface 205 pushes the second inclined surface 206. When the first inclined surface 205 and the second inclined surface 206 move relative to each other, the active electrode unit 203 gradually moves closer to the inner electrode housing 202.

[0045] In some examples, based on the symmetrical welding positions on both sides of the workpiece, the movable trigger component 204 is provided with two opposing first inclined surfaces 205. The movable trigger component 204 is wedge-shaped, with the two first inclined surfaces 205 facing the two sides of the inner electrode housing 202. Each set of movable electrode units 203 includes two movable electrode units 203, which are respectively disposed on both sides of the movable trigger component 204, ensuring that the two second inclined surfaces 206 are respectively opposite to the two first inclined surfaces 205. When the movable trigger component 204 moves vertically upward, it pushes the two movable electrode units 203 to expand in a direction away from each other, eventually abutting against the inner electrode housing 202. The movable trigger component 204 is provided with a corresponding driving structure to provide power for its movement.

[0046] In some examples, the active electrode unit 203 is provided with several bearings, which are located on the second inclined surface 206 and protrude from the second inclined surface 206. The first inclined surface 205 contacts each bearing to form a rolling connection, so as to replace sliding friction with rolling friction and improve the smoothness of movement.

[0047] like Figure 5 As shown, in some examples, since the workpieces to be welded are located at both ends of the workpieces and are approximately symmetrical to each other, the welding platform 102 is provided with a movable electrode seat 301 and a fixed electrode seat 302. Both the movable electrode seat 301 and the fixed electrode seat 302 are provided with an inner electrode assembly 201, which is used for resistance welding of the upper base plate and the lower base plate, respectively.

[0048] In some examples, to ensure that the movement directions of each movable electrode unit 203 are either moving away from or moving closer to each other, both the movable electrode base 301 and the fixed electrode base 302 are provided with a first sliding structure 303. The first sliding structure 303 is connected to the movable electrode unit 203, so that the movable electrode base 301 is slidably connected to the movable electrode unit 203, and the fixed electrode base 302 is slidably connected to the movable electrode unit 203. To ensure the stability of the movement of the movable electrode unit 203, each movable electrode unit 203 corresponds to multiple first sliding structures 303.

[0049] Specifically, the first sliding structure 303 includes a slider and a slide rail. The slider is disposed on the movable electrode unit 203, and the slide rail is disposed on the movable electrode seat 301 and the fixed electrode seat 302. Alternatively, the slide rail is disposed on the movable electrode unit 203, and the slider is disposed on the movable electrode seat 301 and the fixed electrode seat 302.

[0050] In some examples, a second sliding structure 304 is provided on the welding platform 102, which is connected to the movable electrode holder 301 to allow a sliding connection between the movable electrode holder 301 and the welding platform 102. In the initial state, the movable electrode holder 301 and the fixed electrode holder 302 are close to each other, causing the inner electrode on the movable electrode holder 301 to detach from the inner electrode housing 202. When resistance welding begins, the movable electrode holder 301 gradually moves away from the fixed electrode holder 302, so that the distance between the movable electrode holder 301 and the fixed electrode holder 302 corresponds to the length of the inner electrode housing 202, that is, the inner electrode on the movable electrode holder 301 abuts against the inner electrode housing 202.

[0051] Specifically, the second sliding structure 304 includes a slider and a slide rail. The slider is disposed on the movable electrode seat 301 and the slide rail is disposed on the welding platform 102. Alternatively, the slide rail is disposed on the movable electrode seat 301 and the slider is disposed on the welding platform 102.

[0052] In some examples, the resistance welding equipment also includes a lower base plate welding assembly 401, which is mounted on the frame 101 and positioned at one end of the lower base plate of the workpiece. Since the lower base plate of the workpiece needs to be welded on three edges, three sets of lower base plate welding assemblies 401 are provided. Each set of lower base plate welding assemblies 401 includes multiple pressure mechanisms 403, which can move telescopically to abut or disengage from the weld points on the workpiece surface. Specifically, welding along the length of the lower base plate is completed by three pressure mechanisms 403, and welding along the width of the lower base plate is completed by two pressure mechanisms 403.

[0053] In some examples, the resistance welding equipment also includes an upper base plate welding assembly 402, which is mounted on the frame 101 and positioned at one end of the upper base plate of the workpiece. Since the upper base plate of the workpiece needs to be welded on three edges, three sets of upper base plate welding assemblies 402 are provided. Each set of upper base plate welding assemblies 402 includes multiple pressure mechanisms 403, which can move telescopically to abut or disengage from the weld points on the workpiece surface. Specifically, welding along the length of the upper base plate is completed by two pressure mechanisms 403, and welding along the width of the upper base plate is completed by two pressure mechanisms 403. The height of the upper base plate welding assembly 402 performing welding along the width of the upper base plate can be adjusted to avoid creating welding space along the length of the upper base plate.

[0054] like Figure 6 , Figure 7As shown, the pressure mechanism 403 includes a housing 404 and an abutment portion 405. The housing 404 is mounted on the frame 101, and the abutment portion 405 extends into the interior of the housing 404. Specifically, each housing 404 has two abutment portions 405. The power supply current of the pressure mechanism 403 flows out, passes through one abutment portion 405, is transmitted to the workpiece, further transmitted to the inner electrode assembly 201, and then from the workpiece to the other abutment portion 405. The current flows back, completing the resistance welding.

[0055] Furthermore, to enable the abutment portion 405 to move to the welding point on the workpiece surface, a third sliding structure 406 is provided inside the housing 404. The third sliding structure 406 is connected to the abutment portion 405, forming a sliding connection between the abutment portion 405 and the housing 404. Specifically, the third sliding structure 406 includes a slide rail and a slider. The slider is disposed on the housing 404, and the slide rail is disposed on the abutment portion 405; alternatively, the slide rail is disposed on the housing 404, and the slider is disposed on the abutment portion 405.

[0056] This invention provides a resistance welding method.

[0057] First, the product is assembled. The lower base plate and the upper base plate are respectively embedded into the two ends of the U-shaped plate, forming a hollow groove structure. The assembled product is then placed upside down on the inner electrode assembly 201, so that the inner wall of the product is in full contact with the inner electrode housing 202, ensuring a large contact area and maintaining the stability of the product.

[0058] The movable electrode holder 301 gradually moves away from the fixed electrode holder 302, so that the distance between the two sets of inner electrode assemblies 201 is adapted to the length of the inner electrode housing 202, and the inner electrodes in the length direction of the lower base plate and the upper base plate abut against the inner electrode housing 202.

[0059] The active trigger component 204 moves vertically, and pushes each active electrode unit 203 to move at the same amplitude in a manner that the first inclined surface 205 and the second inclined surface 206 cooperate, until the inner electrode in the width direction of the welding bottom plate and the upper bottom plate abuts against the inner electrode housing 202.

[0060] The pressure mechanism 403 of the lower base plate welding assembly 401 completes the welding of the lower base plate by extending and retracting to abut against the workpiece and opening the circuit path.

[0061] The pressure mechanism 403 of the upper base plate welding assembly 402 completes the welding of the upper base plate by extending and retracting to abut against the workpiece and opening the circuit path.

[0062] After welding is completed, the movable electrode unit 203 is reset and detached from the inner electrode housing 202. At this time, the staff can take the finished workpiece.

[0063] In some examples, the welding requirements for the workpiece are: reliable spot weld lap strength, free from defects such as detachment, incomplete welding, and weld misalignment; the workpiece appearance must be free from weld marks, oxidation, deformation, scratches, etc.; the spot weld lap gap must be less than 0.2mm; and the product qualification rate must be no less than 99.7%.

[0064] The installation environment for resistance welding equipment should be free from dust, corrosive media, other harmful gases, flammable and explosive gases, strong magnetic field interference, and strong vibration. The thickness of the foundation concrete should be no less than 150mm. The average relative humidity should be less than 90%. The ambient temperature should be between 5 and 40℃, and during transportation and storage, the ambient temperature should be between -25℃ and 55℃.

[0065] In some examples, resistance welding equipment also includes an operation control box, an external operation start box, and accessories such as conductive circuits. The external electrical control system uses a PLC and a human-machine interface touch screen to centrally set, control, store, and recall the system's action program, and has alarm functions.

[0066] In the description of this specification, the use of terms such as "an embodiment," "some examples," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" indicates that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A resistance welding device, characterized in that, include: A frame, on which a welding platform is provided; An inner electrode assembly is disposed on the welding platform. The inner electrode assembly includes an inner electrode housing, a plurality of movable electrode units, and a movable triggering component. The inner electrode housing can conform to the inner wall of the workpiece. A plurality of inner electrodes are disposed on each movable electrode unit. Each movable electrode unit and the movable triggering component are disposed inside the inner electrode housing. The triggering component is movably connected to the movable electrode unit. The movement of the movable triggering component can push the plurality of movable electrode units away from each other by the same amplitude, so that the inner electrodes on the plurality of movable electrode units simultaneously abut against the inner electrode housing. The active triggering component is provided with a first inclined surface, and the active electrode unit is provided with a second inclined surface. The first inclined surface and the second inclined surface are in contact and movably connected. When the active triggering component moves, the first inclined surface pushes the second inclined surface. When the first inclined surface and the second inclined surface move relative to each other, the active electrode unit gradually moves closer to the inner electrode housing. The welding platform is provided with a movable electrode seat and a fixed electrode seat. Both the movable electrode seat and the fixed electrode seat are provided with a first sliding structure. The first sliding structure is connected to the active electrode unit. The active electrode unit is slidably connected to the movable electrode seat and the fixed electrode seat.

2. The resistance welding equipment according to claim 1, characterized in that, The active triggering component is provided with two opposing first inclined surfaces. The active triggering component is connected to two active electrode units. The movement of the active triggering component drives the two active electrode units to move to the sides respectively.

3. The resistance welding equipment according to claim 1, characterized in that, The internal electrode assembly is provided on both the movable electrode holder and the fixed electrode holder.

4. The resistance welding equipment according to claim 3, characterized in that, The welding platform is provided with a second sliding structure, which is connected to the movable electrode holder. The movable electrode holder is slidably connected to the welding platform so that the movable electrode holder moves closer to or further away from the fixed electrode holder.

5. The resistance welding equipment according to claim 1, characterized in that, The resistance welding equipment also includes a lower base plate welding assembly, which is mounted on the frame. The lower base plate welding assembly includes several pressure mechanisms that are movable so that they can abut against or detach from the workpiece surface.

6. The resistance welding equipment according to claim 5, characterized in that, The resistance welding equipment also includes an upper base plate welding assembly, which is mounted on the frame. The upper base plate welding assembly includes several pressure mechanisms that are movable so that they can abut against or detach from the workpiece surface.

7. The resistance welding equipment according to claim 6, characterized in that, The pressurizing mechanism includes a housing and an abutment portion. The housing is mounted on the frame, and the abutment portion extends into the interior of the housing. A third sliding structure is provided inside the housing and is connected to the abutment portion. The abutment portion can slide closer to or further away from the workpiece surface.

8. A resistance welding method, applied to the resistance welding equipment as described in any one of claims 1 to 7, characterized in that: Invert the assembled product onto the inner electrode assembly to ensure that the inner wall of the product is in close contact with the inner electrode housing. The internal electrode assemblies move relative to each other so that the distance between them is adapted to the length of the internal electrode housing. The active triggering component moves, driving each active electrode unit to move away from each other by the same amplitude, until the distance between each active electrode unit adapts to the length of the inner electrode housing, and the inner electrode abuts against the inner electrode housing. The resistance welding equipment performs welding on the upper and lower base plates of the product, respectively. After welding is completed, all internal electrode assemblies are reset, and the finished workpiece is removed.

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