Resistance welding structure and resistance welding device for an auxiliary power unit

Abstract

The application relates to the technical field of auxiliary power device welding, and discloses a resistance welding structure and a resistance welding device of an auxiliary power device. The resistance welding structure comprises a welding assembly used for contacting a workpiece, a resistance sheet arranged on the side of the welding assembly far from the workpiece, a capacitor assembly arranged on the side of the resistance sheet far from the workpiece, and a discharge assembly arranged correspondingly to the capacitor assembly and used for connecting a ground wire. The discharge assembly can be in contact with or separated from the capacitor assembly. The resistance sheet is configured to have a preset breakdown voltage threshold value, the threshold value is higher than the working voltage during normal welding of the welding assembly, and the threshold value is lower than a peak voltage generated during abnormal discharge. The resistance welding device comprises a driving mechanism and two resistance welding structures, the driving mechanism is connected with the two resistance welding structures and is used for driving the two resistance welding structures to move in the same direction or opposite directions. The application solves the technical problem that the welding device in the related art cannot monitor abnormal discharge during welding.

Description

Technical Field

[0001] This invention relates to the field of auxiliary power device welding technology, and in particular to a resistance welding structure and resistance welding device for an auxiliary power device. Background Technology

[0002] High-pressure turbine components of aircraft engine auxiliary power units (APUs) commonly employ honeycomb sealing structures to improve airtightness and high-temperature resistance. This structure consists of honeycomb cores and panels connected by high-temperature brazing, so that the honeycomb cores are reliably fixed on support rings (or panels, substrates) made of stainless steel or high-temperature alloys, forming a complete sealing assembly.

[0003] Currently, existing welding equipment has the problem of not being able to monitor welding quality in a timely manner when welding auxiliary power devices. Summary of the Invention

[0004] This application discloses a resistance welding structure and a resistance welding device for an auxiliary power unit, in order to solve the technical problem that welding devices in related technologies cannot monitor abnormal welding discharges.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] In a first aspect, this application discloses a resistance welding structure for an auxiliary power device, comprising:

[0007] Welding components, used for contact with the workpiece;

[0008] The resistance element is positioned on the side of the welding assembly furthest from the workpiece.

[0009] The capacitor assembly is located on the side of the resistor sheet furthest from the workpiece;

[0010] The discharge component is provided in conjunction with the capacitor component and is used to connect to the ground wire; the discharge component can be in contact with or separated from the capacitor component.

[0011] The resistor is configured to have a preset breakdown voltage threshold, which is higher than the operating voltage of the welding assembly during normal welding and lower than the spike voltage generated during abnormal discharge.

[0012] In some designs, the resistance welding structure also includes an insulating housing, on which the welding components, resistance elements, capacitor components, and discharge components are all mounted.

[0013] In some designs, the welding assembly includes a contact plate and an electrode. The contact plate is used to contact the workpiece, and one end of the electrode passes through a resistor and is connected to the contact plate, while the other end is used to connect to an external power source.

[0014] The resistor element is positioned on the side of the contact piece furthest from the workpiece.

[0015] In some designs, the welding assembly also includes a first temperature memory alloy disposed on the contact piece;

[0016] And / or, a first insulator is provided between the electrode and the resistive element;

[0017] And / or, the contact surface between the contact piece and the workpiece is an arc surface;

[0018] And / or, the contact pad has multiple through-holes.

[0019] In some designs, the capacitor assembly includes a mounting plate and multiple capacitor bodies. The mounting plate is made of conductive material and is positioned on the side of the resistive element away from the workpiece. The multiple capacitor bodies are positioned on the side of the mounting plate away from the workpiece.

[0020] The discharge component can be in contact with or separated from multiple capacitor bodies.

[0021] In some designs, the capacitor assembly also includes multiple second insulators, with a second insulator positioned between any two adjacent capacitor bodies.

[0022] In some designs, the discharge assembly includes a conductive sheet, a second temperature memory alloy, a grounding post, and an elastic element. The conductive sheet corresponds to the capacitor assembly. One end of the second temperature memory alloy is connected to the insulating shell, and the other end is connected to the conductive sheet. One end of the grounding post is connected to the conductive sheet, and the other end passes through the insulating shell and is used to connect to the ground wire.

[0023] The elastic element is disposed on the capacitor assembly, and the elastic element and the conductive sheet stop each other as the conductive sheet moves toward the capacitor assembly.

[0024] In some designs, the end of the capacitor body protrudes beyond the end of the second insulator;

[0025] And / or, the conductive sheet has a protrusion corresponding to the capacitor body;

[0026] And / or, there are two capacitor assemblies, arranged on both sides of the welding assembly;

[0027] And / or, the conductive sheet has a through hole through which an electrode passes and is spaced with the conductive sheet.

[0028] Secondly, this application also discloses a resistance welding apparatus, including a drive mechanism and two resistance welding structures as described in the first aspect. The drive mechanism is connected to the two resistance welding structures and is used to drive the two resistance welding structures to move in opposite directions.

[0029] In some designs, the drive mechanism includes two telescopic rods, the piston ends of which are connected to the resistance welding device.

[0030] The technical solution adopted in this invention can achieve the following beneficial effects:

[0031] The resistance welding structure of this invention achieves selective conduction through a preset breakdown voltage threshold of the resistance element: during normal welding, the operating voltage of the welding component is lower than the threshold, the resistance element remains in a high-resistance state, isolating the capacitor component from the main welding circuit and ensuring that the welding process is not disturbed; when an abnormal discharge generates a spike voltage exceeding the threshold, the resistance element breaks down instantaneously, introducing the abnormal current into the capacitor component for storage. The discharge component is set corresponding to the capacitor component and connected to the ground wire. When an abnormality occurs, it contacts the capacitor component, forming a grounding loop to release the stored charge as a recordable electrical pulse; when there is no abnormality, it remains separated, allowing the capacitor component to accumulate charge normally. This design transforms instantaneous, invisible abnormal discharges into quantifiable pulse signals, realizing real-time data monitoring of the quality of each weld point, and solving the industry problem of traditional welding relying on post-weld inspection and being unable to capture microscopic damage in a timely manner. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the working state of the resistance welding structure disclosed in some embodiments of this application;

[0034] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0035] Figure 3 This is a cross-sectional view of the resistance welding structure disclosed in some embodiments of this application;

[0036] Figure 4 yes Figure 3 Enlarged view of point B in the middle;

[0037] Figure 5 yes Figure 3 Enlarged view of point C in the middle;

[0038] Figure 6 These are isometric views of some resistance-welded structures disclosed in some embodiments of this application;

[0039] Figure 7 This is a schematic diagram of the resistance welding apparatus disclosed in some embodiments of this application.

[0040] In the picture:

[0041] 100-Resistance welding structure, 110-Welding assembly, 111-Contact piece, 112-Electrode, 113-First temperature memory alloy, 120-Resistance piece, 130-Capacitor assembly, 131-Mounting piece, 132-Capacitor body, 133-Second insulator, 140-Discharge assembly, 141-Conductive piece, 1411-Protrusion, 142-Second temperature memory alloy, 143-Elastic element, 144-Grounding post, 150-Insulating shell, 160-First insulator;

[0042] 200 - Resistance welding device, 210 - Drive mechanism, 211 - Telescopic rod;

[0043] 300 - workpiece, 310 - honeycomb. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0045] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0046] During the maintenance of the auxiliary power unit, the inventors discovered that existing welding equipment suffers from the inability to monitor welding quality in a timely manner when welding the honeycomb sealing structure of the auxiliary power unit. This is primarily due to the device's technological characteristics and physical limitations. The honeycomb core has extremely thin walls, making it a typical thin-walled component. During resistance welding, it is highly susceptible to instantaneous arc burns or collapse due to excessive current density or uneven pressure. This microscopic damage often occurs within milliseconds and is hidden inside the weld joint or beneath the surface, making it difficult to detect with the naked eye. Traditional processes rely excessively on post-weld visual inspection and destructive sampling, failing to capture these abnormal signals at the moment welding occurs. Furthermore, existing equipment lacks a mechanism to sense and report electrical signal fluctuations (such as instantaneous high-voltage spikes) during welding in real time. This means that operators can only discover scrapped parts due to incomplete welding, overheating, or deformation after all welding is completed or even after subsequent brazing processes have begun, resulting in significant cost waste and delivery delays.

[0047] The following is in conjunction with the appendix Figures 1 to 7 The resistance welding structure 100 and resistance welding device 200 of the auxiliary power device provided in this application will be described in detail through specific embodiments and application scenarios.

[0048] Some embodiments of this application disclose a resistance welding structure 100, including a welding assembly 110, a resistance sheet 120, a capacitor assembly 130, a discharge assembly 140, and an insulating shell 150.

[0049] like Figure 1 , Figure 3 and Figure 6 As shown, the welding assembly 110 is used to contact the workpiece 300. The welding assembly 110 is used to contact the workpiece 300 to ensure that the welding current can stably pass through the workpiece 300 to form a loop, while providing a direct physical contact interface for subsequent abnormal signal detection.

[0050] In this embodiment, workpiece 300, such as Figure 1 and Figure 2 As shown, the same applies below.

[0051] like Figure 3 and Figure 6 As shown, the resistor 120 is disposed on the side of the welding assembly 110 away from the workpiece 300. The resistor 120 is disposed on the side of the welding assembly 110 away from the workpiece 300 so that it is electrically isolated from the main welding circuit during normal welding, thus avoiding interference with the welding process.

[0052] like Figure 3 and Figure 6As shown, the capacitor assembly 130 is disposed on the side of the resistor 120 away from the workpiece 300. The resistor 120 is configured to have a preset breakdown voltage threshold, which is higher than the operating voltage of the welding assembly 110 during normal welding and lower than the spike voltage generated during abnormal discharge. By setting the resistor 120 with the preset breakdown voltage threshold, during normal welding, since the operating voltage of the welding assembly 110 is lower than the threshold, the resistor 120 remains in a high-resistance state, electrically isolating the capacitor assembly 130 from the main welding circuit and ensuring that the welding process is not disturbed. When an abnormal discharge occurs and the spike voltage exceeds the threshold, the resistor 120 breaks down and conducts instantaneously, introducing the abnormal current into the capacitor assembly 130 for storage. This allows for selective capture of abnormal discharge signals without affecting normal welding, providing a basis for the subsequent discharge assembly 140 to release charge and record welding quality.

[0053] like Figure 3 and Figure 6 As shown, the discharge component 140 is positioned corresponding to the capacitor component 130 and is used to connect to the ground wire; the discharge component 140 can be in contact with or separated from the capacitor component 130. The discharge component 140, positioned corresponding to the capacitor component 130 and connected to the ground wire, allows for contact with or separation from the capacitor component 130. In the event of an abnormal discharge, contact with the capacitor component 130 forms a grounding loop, releasing the stored charge through the ground wire and generating a discharge pulse that can be recorded externally. When there is no abnormality, the component remains separated, allowing the capacitor component 130 to accumulate charge normally. This structure converts the instantaneous abnormal discharge during the welding process into a recordable electrical signal, enabling data-driven monitoring of welding quality.

[0054] The resistance welding structure 100 achieves selective conduction through a preset breakdown voltage threshold of the resistor element 120: During normal welding, the operating voltage of the welding component 110 is lower than the threshold, and the resistor element 120 remains in a high-resistance state, isolating the capacitor component 130 from the main welding circuit and ensuring that the welding process is not disturbed; when an abnormal discharge generates a spike voltage exceeding the threshold, the resistor element 120 breaks down instantaneously, introducing the abnormal current into the capacitor component 130 for storage. The discharge component 140 is set corresponding to the capacitor component 130 and connected to the ground wire. When an abnormality occurs, it contacts the capacitor component 130 to form a grounding loop, releasing the stored charge as a recordable electrical pulse; when there is no abnormality, it remains separated, allowing the capacitor component 130 to accumulate charge normally. This design transforms instantaneous, invisible abnormal discharges into quantifiable pulse signals, realizing real-time data monitoring of the quality of each weld point and solving the industry problem of traditional welding relying on post-weld inspection and being unable to capture microscopic damage in a timely manner.

[0055] like Figure 3As shown, the welding assembly 110, resistor 120, capacitor assembly 130, and discharge assembly 140 are all mounted on the insulating housing 150. The insulating housing 150 provides stable mechanical support and electrical isolation for the welding assembly 110, resistor 120, capacitor assembly 130, and discharge assembly 140, ensuring that each component maintains a precise relative position during the welding process, while preventing external interference from affecting the accuracy of the monitoring signal.

[0056] like Figure 3 and Figure 6 As shown, the welding assembly 110 includes a contact piece 111 and an electrode 112. The contact piece 111 is used to contact the workpiece 300. One end of the electrode 112 passes through the resistor piece 120 and is connected to the contact piece 111, while the other end is used to connect to an external power supply. The welding assembly 110 directly contacts the workpiece 300 through the contact piece 111. One end of the electrode 112 passes through the resistor piece 120 and is connected to the contact piece 111, while the other end is connected to an external power supply, forming a stable welding main circuit. The design of the electrode 112 passing through the resistor piece 120 places the resistor piece 120 spatially between the welding assembly 110 and the capacitor assembly 130, enabling it to directly sense the electrical signals transmitted by the welding assembly 110 without affecting the normal conductivity of the electrode 112. This structure, while ensuring stable transmission of welding current, provides a direct electrical path for the resistor piece 120 to accurately sense abnormal discharge spike voltages, realizing the physical integration of the welding main circuit and the monitoring circuit.

[0057] In this embodiment, the resistor 120 is disposed on the side of the contact piece 111 away from the workpiece 300.

[0058] In this embodiment, the electrode 112 is cylindrical, with its end extending to the outside of the insulating housing 150 and connected to a power source. The cylindrical electrode 112 is easy to process and assemble, and its end extending to the outside of the insulating housing 150 allows for quick and stable connection to an external power source, ensuring reliable welding current input.

[0059] like Figure 3 As shown, the welding assembly 110 also includes a first temperature memory alloy 113, which is disposed on the contact piece 111. The first temperature memory alloy 113, disposed on the contact piece 111, enables it to sense temperature changes during the welding process and generate corresponding deformation, actively adjusting the contact state between the contact piece 111 and the honeycomb 310 core. For the extremely thin-walled honeycomb 310, the first temperature memory alloy 113 allows the contact piece 111 to adaptively conform to the surface of the workpiece 300 (e.g., the honeycomb 310). When the temperature rises, the deformation of the first temperature memory alloy 113 compensates for the thermal expansion of the contact piece 111, preventing local overpressure collapse of the honeycomb 310 due to pressure fluctuations; simultaneously, its deformation can adapt to the minute undulations of the honeycomb 310 surface, making the current distribution more uniform and preventing arc burns caused by concentrated current density.

[0060] In this embodiment, the extension direction of the first temperature memory alloy 113 is the same as the extension direction of the contact piece 111. The fact that the extension direction of the first temperature memory alloy 113 is the same as the extension direction of the contact piece 111 allows its deformation to be uniformly transmitted along the contact piece 111, driving the entire contact surface to synchronously adjust its contact state with the workpiece 300 surface, reducing the occurrence of uneven pressure due to localized deformation.

[0061] like Figure 3 and Figure 5 As shown, a first insulator 160 is provided between the electrode 112 and the resistor 120. The first insulator 160 is disposed between the electrode 112 and the resistor 120 to achieve electrical isolation between the electrode 112 and the resistor 120, ensuring that the resistor 120 remains in a high resistance state and is not shunted by the electrode 112 during normal welding, while still being able to sense the peak voltage through the gap during abnormal discharge, ensuring that the monitoring circuit is independent and reliable.

[0062] like Figure 3 and Figure 6 As shown, the contact surface between the contact piece 111 and the workpiece 300 is an arc surface. The arc surface of the contact piece 111 matches the curved surfaces of the inner and outer surfaces of the workpiece 300, increasing the contact area and making the current and pressure distribution more uniform.

[0063] The contact piece 111 has multiple through-holes. During the welding process, the microholes of the contact piece 111 release the gas generated at the contact interface due to high temperature, avoiding secondary arcing caused by gas gap ionization. At the same time, the edges of the microholes form microscopic multi-point contact, making the current distribution more uniform and preventing excessive local current density from burning the honeycomb 310.

[0064] like Figure 3 and Figure 6 As shown, the capacitor assembly 130 includes a mounting plate 131 and multiple capacitor bodies 132. The mounting plate 131 is made of conductive material and is disposed on the side of the resistive sheet 120 away from the workpiece 300. The multiple capacitor bodies 132 are disposed on the side of the mounting plate 131 away from the workpiece 300. The discharge assembly 140 can contact or separate from the multiple capacitor bodies 132. The multiple capacitor bodies 132, disposed on the side of the mounting plate 131 away from the workpiece 300, form a parallel charge storage array. When an abnormal discharge breaks down the resistive sheet 120, the current is evenly distributed through the mounting plate 131 to the multiple capacitor bodies 132 for storage, improving the charge absorption capacity and response speed. The discharge assembly 140 is disposed corresponding to the multiple capacitor bodies 132. When an abnormality occurs, it contacts them to form a grounding loop, releasing the stored charge as a recordable pulse. When there is no abnormality, it remains separated, ensuring that the capacitor bodies 132 can stably accumulate charge.

[0065] like Figure 3 ,Figure 4 and Figure 6 As shown, the capacitor assembly 130 also includes a plurality of second insulators 133, with a second insulator 133 provided between any two adjacent capacitor bodies 132. The second insulators 133 are disposed between adjacent capacitor bodies 132 to achieve electrical isolation between each capacitor body 132, prevent crosstalk between capacitors, ensure that each capacitor body 132 independently and stably stores the charge introduced by abnormal discharge, and improve the reliability and consistency of charge absorption.

[0066] In this embodiment, two capacitor components 130 are provided and located on both sides of the electrode 112, with a gap between them. By providing two capacitor components 130 and ensuring a gap between them and the electrode 112, the capacitor components 130 can absorb the charge transferred through the resistive sheet 120 to the maximum extent without interfering with the normal electrical conduction of the electrode 112.

[0067] like Figure 3 and Figure 6 As shown, the discharge assembly 140 includes a conductive sheet 141, a second temperature memory alloy 142, a grounding post 144, and an elastic element 143. The conductive sheet 141 is disposed corresponding to the capacitor assembly 130. One end of the second temperature memory alloy 142 is connected to the insulating housing 150, and the other end is connected to the conductive sheet 141. One end of the grounding post 144 is connected to the conductive sheet 141, and the other end passes through the insulating housing 150 and is used to connect to the ground wire. The elastic element 143 is disposed on the capacitor assembly 130, and during the movement of the conductive sheet 141 toward the capacitor assembly 130, the elastic element 143 abuts against the conductive sheet 141. One end of the second temperature memory alloy 142 is connected to the insulating housing 150, and the other end is connected to the conductive sheet 141. Under the action of the heat generated by abnormal discharge, the conductive sheet 141 is driven to move toward the capacitor assembly 130. One end of the grounding post 144 is connected to the conductive sheet 141, and the other end passes through the insulating housing 150 and connects to the ground wire. After contact is formed, the stored charge is released as a recordable pulse through the ground wire. After the anomaly ends, the second temperature memory alloy 142 cools and contracts, and the elastic element 143 releases the stored energy to drive the conductive sheet 141 to separate from the capacitor assembly 130, causing the discharge assembly 140 to automatically reset and prepare for the next anomaly monitoring. This structure realizes a complete functional cycle of thermal drive connection, elastic element 143 pressure holding, grounding discharge, and automatic reset.

[0068] In this embodiment, the elastic element 143 is disposed on the mounting piece 131 of the capacitor assembly 130.

[0069] In this embodiment, the elastic element 143 is preferably a spring sheet, and multiple spring sheets are provided.

[0070] In this embodiment, the conductive sheet 141 has a through hole through which the electrode 112 passes, with a gap between the electrode 112 and the conductive sheet 141. The through hole of the conductive sheet 141 allows the electrode 112 to pass through, achieving a compact spatial layout; the gap between the through hole and the electrode 112 ensures that the conductive sheet 141 remains electrically isolated from the electrode 112 during movement, avoiding interference with the welding main circuit.

[0071] like Figure 4 As shown, the end of the capacitor body 132 protrudes beyond the end of the second insulator 133. This protrusion ensures that the conductive sheet 141 preferentially forms reliable electrical contact with the capacitor body 132 when it moves, preventing poor contact due to obstruction by the insulator and ensuring that abnormal charges can be stably released as recordable pulses.

[0072] like Figure 3 As shown, the conductive sheet 141 has a protrusion 1411 corresponding to the capacitor body 132. The protrusion 1411 of the conductive sheet 141 is precisely aligned with the end of the capacitor body 132 to ensure that a reliable electrical contact is formed preferentially when the second temperature memory alloy 142 is driven, avoiding interference with the second insulator 133 and ensuring stable release of abnormal charges.

[0073] Some embodiments of this application also disclose a resistance welding apparatus 200, including a drive mechanism 210 and a resistance welding structure 100.

[0074] like Figure 7 As shown, the drive mechanism 210 is connected to two resistance welding structures 100 and is used to drive the two resistance welding structures 100 to move in opposite directions. The drive mechanism 210, connected to the two resistance welding structures 100, achieves synchronous clamping and welding of the workpiece 300 by driving the two resistance welding structures 100 to move in opposite directions, ensuring uniform contact pressure on both sides and preventing collapse of the thin-walled honeycomb 310 due to uneven stress caused by unilateral pressure. Driving the two resistance welding structures 100 to move in opposite directions enables rapid separation, facilitating the loading and unloading of the workpiece 300. Simultaneously, the two resistance welding structures 100 correspond to the welding areas on both sides of the workpiece 300, enabling simultaneous monitoring on both sides and improving the capture coverage of abnormal discharge signals.

[0075] like Figure 7 As shown, the drive mechanism 210 includes two telescopic rods 211, the piston ends of which are respectively connected to the resistance welding device 200. The piston ends of the two telescopic rods 211 are respectively connected to the resistance welding structure 100, realizing independent driving and synchronous movement of the two resistance welding structures 100, ensuring that uniform welding pressure is applied to both sides of the workpiece 300, while simplifying the transmission structure and improving the accuracy of action response.

[0076] In this embodiment, the telescopic rod 211 can be an electric telescopic rod 211, a hydraulic telescopic rod 211, or a pneumatic telescopic rod 211, etc., and can be flexibly set according to usage requirements. This embodiment does not limit this. It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0077] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0078] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A resistance welding structure for an auxiliary power device, characterized in that, include: Welding components, used for contact with the workpiece; A resistance element is disposed on the side of the welding assembly away from the workpiece; A capacitor assembly is disposed on the side of the resistive element away from the workpiece; A discharge component is provided corresponding to the capacitor component and is used to connect to the ground wire; the discharge component can be in contact with or separated from the capacitor component; The resistor is configured to have a preset breakdown voltage threshold, which is higher than the operating voltage of the welding assembly during normal welding and lower than the spike voltage generated during abnormal discharge. The resistance welding structure also includes an insulating shell, and the welding assembly, the resistance sheet, the capacitor assembly and the discharge assembly are all mounted on the insulating shell; The welding assembly includes a contact piece and an electrode. The contact piece is used to contact the workpiece. One end of the electrode passes through the resistive element and is connected to the contact piece. The other end is used to connect to an external power source. The resistor is disposed on the side of the contact piece away from the workpiece; The welding assembly further includes a first temperature memory alloy, which is disposed on the contact piece; The capacitor assembly includes a mounting plate and multiple capacitor bodies. The mounting plate is made of conductive material and is disposed on the side of the resistive sheet away from the workpiece. The multiple capacitor bodies are disposed on the side of the mounting plate away from the workpiece. The discharge component can be in contact with or separated from multiple capacitor bodies; The discharge assembly includes a conductive sheet, a second temperature memory alloy, a grounding post, and an elastic element. The conductive sheet is disposed corresponding to the capacitor assembly. One end of the second temperature memory alloy is connected to the insulating shell, and the other end is connected to the conductive sheet. One end of the grounding post is connected to the conductive sheet, and the other end passes through the insulating shell and is used to connect to the ground wire. The elastic element is disposed on the capacitor assembly, and during the movement of the conductive sheet toward the capacitor assembly, the elastic element and the conductive sheet abut against each other.

2. The resistance welding structure of an auxiliary power device according to claim 1, characterized in that, A first insulator is provided between the electrode and the resistor sheet; And / or, the contact surface between the contact piece and the workpiece is an arc surface; And / or, the contact patch has a plurality of through-holes.

3. The resistance welding structure of an auxiliary power device according to claim 1, characterized in that, The capacitor assembly also includes a plurality of second insulators, with the second insulators provided between any two adjacent capacitor bodies.

4. The resistance welding structure of an auxiliary power device according to claim 3, characterized in that, The end of the capacitor body protrudes beyond the end of the second insulator; And / or, the conductive sheet has a protrusion corresponding to the capacitor body; And / or, there are two capacitor assemblies, arranged on both sides of the welding assembly; And / or, the conductive sheet has a through hole, the electrode passes through the through hole, and there is a gap between the electrode and the conductive sheet.

5. A resistance welding apparatus, characterized in that, It includes a drive mechanism and two resistance welding structures as described in any one of claims 1-4, wherein the drive mechanism is connected to the two resistance welding structures and is used to drive the two resistance welding structures to move in opposite directions.

6. The resistance welding apparatus according to claim 5, characterized in that, The drive mechanism includes two telescopic rods, and the piston ends of the two telescopic rods are respectively connected to the resistance welding device.

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