Metal plate repairing method and device based on multi-point cold welding

Abstract

The invention relates to the technical field of repairing, in particular to a metal plate repairing method and device based on multi-point cold welding, and the method comprises the steps that a to-be-repaired area of a metal plate part is cleaned, the cleanliness of the to-be-repaired area of the metal plate part is detected, and under the condition that the cleanliness meets the target requirement, the to-be-repaired area of the metal plate part is repaired; and the base material, the damage depth and the metal plate thickness of the to-be-repaired area are obtained, so that repair pulse current, repair pulse time, welding frequency and welding flux used for repairing the to-be-repaired area are obtained, spot welding repair is conducted on the to-be-repaired area, and a final repair area is obtained. Therefore, the problems that in the related technology, various repairing methods highly depend on experience of operators, the repairing quality is unstable due to manual operation differences, obvious repairing traces are left, meanwhile, a metal plate base material is possibly damaged, the repairing efficiency is low, the cost is high, and large-scale and standardized production requirements are difficult to meet are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of repair, in particular to a sheet metal repair method and device based on multi-point cold welding. BACKGROUND

[0002] In the production, transportation and use of sheet metal parts, surface scratches are easily caused by factors such as collision and friction. These scratches not only affect the appearance of the sheet metal part, but also may reduce the corrosion resistance of the sheet metal part and shorten its service life.

[0003] In related technologies, the methods for repairing these sheet metal parts mainly include sandpaper polishing method, sheet metal putty filling repair method and traditional welding repair method. Among them, the sandpaper polishing method mainly implements progressive polishing treatment on the scratch area through gradient grit sandpaper, gradually removes the surface scratch defects to achieve the dual goals of scratch elimination and surface gloss recovery; the sheet metal putty filling repair method mainly aims at medium-depth scratches (especially with recess defects), fills the scratch recess area with putty material, and then realizes surface flatness and gloss recovery through subsequent processing; the traditional welding repair method mainly aims at deep penetrating scratches (such as sheet metal part surface scratches with a depth of more than 1 / 3 of the base material thickness and local defects), fills the scratch defect area with metal welding wire / welding material matched with the sheet metal base material after melting through high-temperature welding technologies such as electric arc welding and gas welding, and then forms an integral part with the base material after the welding material cools and solidifies, and then restores the surface flatness through subsequent processing.

[0004] However, in related technologies, the sandpaper polishing method has high artificial dependence, requires high skill, detail control ability and material recognition level of workers, and if the operation specification is not proper, it is easy to cause excessive removal of the sheet metal surface base material, damage the original surface flatness, and additional processing is required, which increases the process complexity and cost, and cannot fill the scratch recess area, so the repair quality is difficult to determine; the sheet metal putty filling repair method depends on the matching of sheet metal putty and the base material of the repaired object, otherwise it will cause combination failure, insufficient solidification and other situations, which requires high time and cost investment, but cannot achieve long-term stable repair effect; the high temperature in the process of traditional welding repair method easily causes deformation of the sheet metal part, and obvious repair scars are easily formed after welding, which is not suitable for thin-walled sheet metal parts, and may also damage the surface plating, increase the repair cost and period, and urgently needs to be solved. SUMMARY

[0005] The present application provides a sheet metal repair method and device based on multi-point cold welding to solve the problems in related technologies that various repair methods are highly dependent on the experience of operators, are easy to cause unstable repair quality due to human operation differences, leave obvious repair marks and may also cause damage to the sheet metal base material, have low repair efficiency and high cost, and are difficult to meet the production needs of large-scale and standardization.

[0006] The first aspect of the present application provides a sheet metal repair method based on multi-point cold welding, comprising the following steps: cleaning the repair area of the sheet metal part, and detecting the cleanliness of the repair area of the sheet metal part, so that the base material quality, damage depth and sheet metal thickness of the repair area are obtained when the cleanliness meets the target requirement; based on the base material quality, the damage depth and the sheet metal thickness, the repair pulse current, the repair pulse time, the welding frequency and the solder for repairing the repair area are obtained; based on the repair pulse current, the repair pulse time, the welding frequency and the solder, the repair area is spot welded to obtain the final repair area.

[0007] Optionally, in an embodiment of the present application, the spot welding repair of the repair area based on the repair pulse current, the repair pulse time, the welding frequency and the solder includes: detecting the environmental gas of the repair area; when the environmental gas is argon, the repair area is spot welded.

[0008] Optionally, in an embodiment of the present application, the spot welding repair of the repair area to obtain the final repair area includes: detecting the environmental temperature of the repair area after spot welding repair; when the environmental temperature meets the target temperature requirement, the repair area after spot welding repair is polished until the surface roughness of the repair area after spot welding repair reaches the target roughness requirement to obtain the final repair area.

[0009] Optionally, in an embodiment of the present application, the spot welding repair of the repair area to obtain the final repair area includes: detecting the physical strength of the repair area after spot welding repair; when the physical strength meets the target strength requirement, the final repair area is obtained.

[0010] Optionally, in an embodiment of the present application, the repair pulse current, the repair pulse time and the welding frequency for repairing the repair area are obtained based on the base material quality and the damage depth, including: based on the pulse current and the feed speed corresponding to a plurality of base material qualities and a plurality of damage depths, a preset database for querying the repair pulse current, the repair pulse time and the welding frequency is constructed; based on the base material quality and the damage depth, the repair pulse current, the repair pulse time and the welding frequency are obtained from the preset database.

[0011] The second aspect embodiment of the present application provides a sheet metal repairing device based on multi-point cold welding, characterized in that the device comprises a cleaning module configured to clean a to-be-repaired area of a sheet metal part and detect the cleanliness of the to-be-repaired area of the sheet metal part, so as to obtain the base material quality, damage depth and sheet metal thickness of the to-be-repaired area when the cleanliness meets a target requirement; an obtaining module configured to obtain a repairing pulse current, a repairing pulse time, a welding frequency and a welding material for repairing the to-be-repaired area based on the base material quality, the damage depth and the sheet metal thickness; and a repairing module configured to spot weld and repair the to-be-repaired area based on the repairing pulse current, the repairing pulse time, the welding frequency and the welding material, so as to obtain a final repairing area.

[0012] Optionally, in an embodiment of the present application, the repairing module comprises a first detection unit configured to detect the environmental gas of the to-be-repaired area, and a repairing unit configured to spot weld and repair the to-be-repaired area when the environmental gas is argon.

[0013] Optionally, in an embodiment of the present application, the repairing module comprises a second detection unit configured to detect the environmental temperature of the to-be-repaired area after spot welding and repairing, and a polishing unit configured to polish the to-be-repaired area after spot welding and repairing until the surface roughness of the to-be-repaired area after spot welding and repairing reaches a target roughness requirement, so as to obtain the final repairing area, when the environmental temperature meets a target temperature requirement.

[0014] Optionally, in an embodiment of the present application, the repairing module comprises a third detection unit configured to detect the physical strength of the to-be-repaired area after spot welding and repairing, and a determination unit configured to obtain the final repairing area when the physical strength meets a target strength requirement.

[0015] Optionally, in an embodiment of the present application, the obtaining module comprises a construction unit configured to construct a preset database for querying the repairing pulse current, the repairing pulse time and the welding frequency based on the pulse current and the feeding speed corresponding to a plurality of base material qualities and a plurality of damage depths, and an obtaining unit configured to obtain the repairing pulse current, the repairing pulse time and the welding frequency from the preset database based on the base material quality and the damage depth.

[0016] The third aspect embodiment of the present application provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the program to implement the sheet metal repairing method based on multi-point cold welding as described in the above embodiments.

[0017] The fourth aspect of the present application provides a computer readable storage medium storing a computer program, which is executed by a processor to implement the sheet metal repairing method based on multi-point cold welding.

[0018] The fifth aspect of the present application provides a computer program product comprising a computer program, which is executed to implement the sheet metal repairing method based on multi-point cold welding.

[0019] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings.

[0020] The embodiments of the present application can repair the to-be-repaired area by a certain repair pulse current, repair pulse time, welding frequency and solder spot welding according to the base material quality, damage depth and sheet metal thickness of the to-be-repaired area, so as to obtain a final repair area. In this way, the combination strength of the final repair area is ensured by matching the base material quality and the solder, and the molten metal welding drops are accurately filled to the scratch bottom point by point and layer by layer by argon and a precision cold welding machine. The whole process is controlled by accurate energy to ensure that the heat input is very small, so as to avoid the problems of deformation, oxidation or performance degradation of the sheet metal due to high temperature. The embodiments of the present application are suitable for repairing thin-walled sheet metal and high-precision sheet metal, and can keep the surface roughness of the repair area consistent with the surrounding surface, realize truly traceless repair, have high repair efficiency and stable quality, and effectively meet the production needs of large-scale and standardization. Thus, the problems in the related art, such as high dependence on the experience of operators, unstable repair quality due to human operation differences, leaving obvious repair traces, possibly causing damage to the sheet metal base material, low repair efficiency, high cost and difficulty in meeting the production needs of large-scale and standardization, are solved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which: Figure 1 The starting and ending engine backfall speed oscillation diagram of an embodiment of the present application; Figure 2 The flowchart of repairing the surface scratch of the automobile door sheet metal of an embodiment of the present application; Figure 3 The structure diagram of the sheet metal repairing device based on multi-point cold welding provided by an embodiment of the present application; Figure 4 The structure diagram of the electronic device provided by an embodiment of the present application.

[0022] REFERENCE NUMERALS 10 - sheet metal repair device based on multi-point cold welding; 100 - cleaning module, 200 - acquisition module and 300 - repair module; 401 - memory, 402 - processor and 403 - communication interface. DETAILED DESCRIPTION

[0023] Embodiments of the present application are described below in detail, examples of which are shown in the accompanying drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0024] A sheet metal repair method and device based on multi-point cold welding of embodiments of the present application are described below with reference to the accompanying drawings. In view of the problems in the related art mentioned in the background art that various repair methods highly depend on the experience of operators, are prone to cause unstable repair quality due to human operation differences, leave obvious repair marks, and may also cause damage to the sheet metal base material, have low repair efficiency and high cost, and are difficult to meet the production needs of large-scale and standardization, the present application provides a sheet metal repair method based on multi-point cold welding. In the method, the base material quality, damage depth and sheet metal thickness of the area to be repaired can be used to repair the area to be repaired by a certain repair pulse current, repair pulse time, welding frequency and solder spot, and the final repair area is obtained. Thus, the combination strength of the final repair area is ensured by matching the base material quality and the solder, and the molten metal droplets are accurately filled point by point and layer by layer to the scratch bottom by argon and a precision cold welding machine. The whole process is controlled by precise energy to ensure that the heat input is very small, avoiding the problems of deformation, oxidation or performance degradation of the sheet metal part due to high temperature. The method is suitable for repairing thin-walled sheet metal parts and high-precision sheet metal parts, and can make the surface roughness of the repair area consistent with the surrounding surface, realizing truly traceless repair, high repair efficiency and stable quality, and effectively meeting the production needs of large-scale and standardization. Thus, the problems in the related art that various repair methods highly depend on the experience of operators, are prone to cause unstable repair quality due to human operation differences, leave obvious repair marks, and may also cause damage to the sheet metal base material, have low repair efficiency and high cost, and are difficult to meet the production needs of large-scale and standardization are solved.

[0025] Before explaining the sheet metal repair method based on multi-point cold welding in embodiments of the present application, the cold welding equipment involved in embodiments of the present application and its working principle are explained.

[0026] The cold welding equipment is mainly based on the principle of resistance heat. In the process of instantaneous discharge, the metal atoms at the contact point of the cold welding wire and the sheet metal base material obtain sufficient energy, overcome the resistance between the atoms, and diffuse with each other to form a metal bond.

[0027] For example, the common capacitor energy storage type cold welding machine, its internal capacitor will store a certain amount of electrical energy in advance, when the welding is triggered, the capacitor will discharge quickly, and a high current pulse will be generated in a very short time (usually a few milliseconds to tens of milliseconds). The current is conducted to the welding wire and the sheet metal workpiece through the cold welding electrode, which can form a high temperature micro area at the contact point (but the overall temperature is much lower than the melting point of the sheet metal), so that the welding wire and the surface metal of the base material are partially melted and fused, realizing cold welding, avoiding the high temperature influence of traditional hot welding.

[0028] Table 1 is a comparison table of the cold welding technology and the traditional hot welding repair technology according to an embodiment of the present application, which can but not limited to represent as follows: Table 1

[0029] Specifically, Figure 1 A flowchart of a sheet metal repair method based on multi-point cold welding provided by an embodiment of the present application.

[0030] As Figure 1 shown, the sheet metal repair method based on multi-point cold welding includes the following steps: Step S101, cleaning the repair area of the sheet metal part, and detecting the cleanliness of the repair area of the sheet metal part, so as to obtain the base material quality, damage depth and sheet metal thickness of the repair area when the cleanliness meets the target requirements; Step S102, based on the base material quality, damage depth and sheet metal thickness, obtaining the repair pulse current, repair pulse time, welding frequency and solder for repairing the repair area; Step S103, based on the repair pulse current, repair pulse time, welding frequency and solder, spot welding the repair area to obtain the final repair area.

[0031] As a possible implementation, when repairing the surface scratch of the repair area of the sheet metal part, the surface of the sheet metal part needs to be cleaned first. The sheet metal part here refers to a metal member with a specific structure shape and function formed by cold processing process with a metal sheet as a base material, for example, a vehicle door, which is a core basic component in the fields of mechanical manufacturing, automobile, electronic equipment, etc. The repair area here can be understood as a specific local range of the surface of the sheet metal part that needs to be treated to restore its function, appearance or use performance due to damage, for example, a scratch area.

[0032] For example, the present application can but not limited to use alcohol or paint cleaner to remove impurities such as oil stains and dust on the surface and periphery of the repair area (such as scratch area) of the surface of the sheet metal part, to ensure that the repair area is clean and pollution-free, and then perform micro area pretreatment on the inside of the damage, such as the inside of the scratch groove, to ensure that the two sides of the paint surface are not damaged.

[0033] Furthermore, in this embodiment, after cleaning, a dedicated polishing tool (such as a pneumatic polisher) can be used with fine-grit sandpaper (40-60 grit recommended) to lightly polish the edges of the area to be repaired (such as the edges of scratches), thereby eliminating burrs and sharp edges on the edges of the area to be repaired, avoiding damage to the electrodes during subsequent cold welding, and creating a smooth transition surface in the area to be repaired.

[0034] After cleaning, this embodiment of the application can then detect whether the cleanliness of the area to be repaired meets the target requirements, and if the cleanliness meets the target requirements, obtain the substrate material, damage depth, and sheet metal thickness of the area to be repaired. Here, the target requirements can be understood as pre-set, clearly defined cleanliness standards to ensure accurate subsequent sheet metal thickness detection and quality spot welding repair. The substrate material and damage depth of the area to be repaired refer to the material and damage depth of the sheet metal component, and the sheet metal thickness refers to the actual thickness of the sheet metal substrate at the location of the area to be repaired.

[0035] After obtaining the material of the sheet metal part in the area to be repaired, the depth of the damage, and the sheet metal thickness of the area to be repaired, the embodiments of this application can calculate the repair pulse current, repair pulse time, and welding frequency for repairing the area to be repaired, and then spot weld the area to be repaired based on the repair pulse current, repair pulse time, and welding frequency.

[0036] In this context, the repair pulse current can be understood as an intermittent, high-energy current output from the welding electrode to the area to be repaired during spot welding repair. This discontinuous current, through this pulsed power supply (power-on-off cycle), can quickly melt the sheet metal substrate, thus achieving weld repair. Generally, the repair pulse current is positively correlated with the sheet metal thickness; that is, the thicker the sheet metal, the larger the pulse current required to penetrate impurities and melt the substrate. For example, a 1.0mm thick sheet metal requires a repair pulse current of 50-80A; a 2.0mm thick sheet metal requires a repair pulse current of 120-150A, and so on.

[0037] The repair pulse time here refers to the duration of a single pulse current application, i.e., the length of time the repair pulse current acts on the sheet metal. It can be used in conjunction with the pulse current to control the welding energy input. Generally, the repair pulse time is also positively correlated with the sheet metal thickness; the thicker the sheet metal, the longer the single pulse time, thus ensuring sufficient energy to melt the sheet metal substrate. For example, the repair pulse time for 1.0mm thick sheet metal is 3-5ms; for 2.0mm thick sheet metal, the repair pulse time is 8-12ms. It is important to note that the repair pulse time needs to be matched with the repair pulse current, such as matching a high current with a short time, and a low current with a long time, to avoid over-melting and causing the sheet metal to burn through.

[0038] The welding frequency here refers to the number of pulse currents per unit time (usually 1 second), that is, the frequency of spot welding. The welding frequency can determine the welding density of the repair area to ensure that the welding points in the repair area are evenly distributed and dense enough, so that the strength of the repaired sheet metal is consistent with the original base material.

[0039] Spot welding here refers to a repair process that uses a combination of parameters, including repair pulse current, pulse time, and welding frequency, to perform intermittent welding at multiple points in the area to be repaired via welding electrodes. This process restores the original structural strength and surface smoothness of the sheet metal area to be repaired (such as scratches).

[0040] It should be noted that the specific sheet metal thickness, the corresponding repair pulse current, repair pulse time, and welding frequency, as well as the relationship between the repair pulse current, repair pulse time, and welding frequency, can all be set or adjusted by those skilled in the art according to the actual situation. The embodiments in this application are only illustrative and do not impose specific limitations.

[0041] Additionally, before spot welding, this embodiment of the application requires the preparation of certain cold welding equipment and solder. Here, solder refers to a functional material used in the welding process to fill the gaps in the joint of the substrate (such as sheet metal parts), and to achieve metallurgical bonding with the substrate after melting, ultimately realizing joint connection or damage filling.

[0042] For example, in this embodiment of the application, an intelligent precision cold welding machine can be used to match 0.8mm steel welding wire (solder) and cut the cold welding wire to a suitable length, generally 10cm, to facilitate subsequent wire feeding operations. Then, the cut cold welding wire is surface treated by using sandpaper to remove the oxide layer and rust on the surface of the welding wire, and then cleaning the surface of the welding wire with a cleaning agent to ensure that the surface of the welding wire is clean, thereby improving the conductivity and welding quality during the cold welding process.

[0043] By selecting a cold welding wire with high compatibility with the sheet metal substrate, this embodiment of the application allows for cold welding operations at room temperature, avoiding the impact of high temperatures on the sheet metal. Furthermore, the cold welding wire and the sheet metal remain unaffected, and dimensional accuracy and appearance quality are not affected. The higher the compositional compatibility between the substrate and the cold welding wire, the stronger the metallic bond formed between the repaired area and the substrate after cold welding. For example, when using aluminum alloy substrates with aluminum-magnesium alloy welding wires, the difference in thermal expansion coefficients is ≤1×10⁻⁶. -6 / ℃, which can effectively avoid interface cracking caused by temperature cycling during long-term use; the cold welding bonding strength reaches more than 95% of the strength of the substrate body, with no risk of putty falling off, and the anti-corrosion performance of the repaired area is consistent with the substrate (no additional anti-corrosion treatment is required for coated parts). The bonding strength is not less than 90% of the strength of the substrate, which is much higher than the bonding strength of the putty filling repair method. It can effectively ensure that the repaired area after cold welding is tightly bonded to the original sheet metal substrate and maintain good performance consistency.

[0044] After preparing the cold welding equipment and materials, this embodiment of the application can adjust the parameters of the cold welding equipment to the corresponding parameters based on the calculated repair pulse current, repair pulse time, and welding frequency. Through dedicated cold welding equipment, this embodiment of the application can achieve automated control of welding parameters (such as cold welding current and filler material (solder) feed speed). Operators only need to perform basic positioning operations, achieving a repair quality consistency error of ≤0.02mm, making it suitable for mass production scenarios.

[0045] For example, this application controls the pulse current to 24A, the pulse time to 15ms, and the welding frequency to 3 times / second based on the existing sheet metal thickness in the workshop; during the operation, the tungsten needle tip of the welding gun accurately melts the metal weld droplets point by point and layer by layer onto the metal substrate at the bottom of the area to be repaired (such as the bottom of the scratch).

[0046] Therefore, the embodiments of this application can strictly limit all operations to the area to be repaired itself. For scratch repair, the surrounding original paint will not be damaged, and the original condition of the sheet metal parts will be preserved to the maximum extent. This abandons the traditional sheet metal repair mode of large-scale disassembly and large-area construction.

[0047] This application embodiment utilizes cold welding technology to achieve a metallurgical bond between the solder (repair materials such as metal welding wire matched to the substrate composition) and the sheet metal substrate at low temperatures. By integrating a precision inverter power supply, pulse control module, and cooling system, it outputs stable ultra-low current, high-frequency pulses. Combined with a specially designed miniature welding torch with a slender tip, it facilitates precise operation of the low-temperature cold welding process. Low-temperature cold welding is achieved through highly concentrated energy and extremely low heat input, ensuring that the mechanical properties and geometry of the sheet metal substrate are not altered during the repair process. This avoids high-temperature weld scars and sheet metal ash interfaces, fundamentally eliminating repair traces. Furthermore, this application embodiment eliminates the need for grinding to remove the substrate, effectively preventing excessive wear and tear that could lead to thickness reduction and extending the service life of the sheet metal parts. It is particularly suitable for applications with high structural performance requirements, such as precision instrument housings and automotive bodies.

[0048] Optionally, in one embodiment of this application, spot welding repair of the area to be repaired is performed based on the repair pulse current, repair pulse time, welding frequency, and solder, including: detecting the ambient gas of the area to be repaired; and spot welding repair of the area to be repaired when the ambient gas is argon.

[0049] In some embodiments, when molten metal droplets (solder) are precisely deposited onto the metal substrate of the area to be repaired point by point and layer by layer through the tip of the tungsten needle of the welding torch, in order to further ensure that the heat input during the welding process is minimal, this application can detect the ambient gas in the area to be repaired and spot weld the area to be repaired when the gas in the area to be repaired is argon.

[0050] For example, in the embodiments of this application, argon gas can be continuously injected into the welding point during the welding process, thereby forming an argon gas environment around the area to be repaired, so that argon gas can be used as a protective gas to ensure that the heat input during the welding process is minimal.

[0051] This application embodiment can integrate a precision inverter power supply, a pulse control module, and a cooling system to output stable ultra-low current, high-frequency pulses. Combined with a specially designed miniature welding torch, the entire welding process is completed in an argon atmosphere, ensuring precise energy control throughout the process. This ensures minimal heat input at the weld point, with the heat-affected zone around the weld point controlled within 0.1-0.5mm, thereby keeping the temperature around the weld point ≤150℃. This ensures that the temperature of the area to be repaired during cold welding is far below the deformation temperature of the sheet metal part, effectively preventing deformation, oxidation, performance degradation, or phase transformation of the sheet metal part due to high temperatures. This ensures that no macroscopic deformation of the sheet metal substrate is caused, making it extremely suitable for thin-walled sheet metal parts (thickness ≥0.3mm) and multi-material sheet metal parts (low carbon steel, stainless steel, aluminum alloy), especially for repairing damage with a depth ≤2mm.

[0052] Optionally, in one embodiment of this application, spot welding repairs the area to be repaired to obtain the final repaired area, including: detecting the ambient temperature of the area to be repaired after spot welding repair; and, if the ambient temperature meets the target temperature requirement, grinding the area to be repaired after spot welding repair until the surface roughness of the area to be repaired after spot welding repair reaches the target roughness requirement, thereby obtaining the final repaired area.

[0053] In some embodiments, after spot welding repair is completed by melting molten metal droplets onto the metal substrate at the bottom of the area to be repaired (such as the bottom of a scratch) point by point and layer by layer, the repaired area can be further processed so that the surface of the finally repaired area can achieve a scratch-free effect.

[0054] Specifically, in this embodiment of the application, after spot welding repair of the area to be repaired, the ambient temperature of the area after spot welding repair is detected, and if the ambient temperature meets the target temperature requirement, the area to be repaired after spot welding repair is ground until the surface roughness of the area to be repaired after spot welding repair reaches the target roughness requirement, thus obtaining the final repaired area.

[0055] Here, the target temperature requirement refers to the pre-set temperature standard that the repaired area and its surrounding environment must reach after the repair work (such as cold welding) is completed. Room temperature is generally acceptable. The target roughness requirement refers to the pre-set quantitative standard for the smoothness of the repaired area surface, which is also the final surface smoothness requirement of the repaired area.

[0056] The specific target temperature and target roughness requirements can be set by those skilled in the art based on actual conditions. The embodiments in this application are merely illustrative and do not impose specific limitations. For example, the target temperature requirement may be room temperature of 25°C or below, and the target roughness requirement may be Ra≤0.8μm, etc.

[0057] For example, after the cold welding operation is completed, the area to be repaired after cold welding is cooled to room temperature (generally the cooling time is 5-10 minutes and the room temperature is 25°C), and then fine sandpaper (grit size is 240-320 mesh) is used to perform preliminary grinding on the repaired area to remove the protrusions and welding slag on its surface, so that the surface of the repaired area is basically flat.

[0058] Then, in this embodiment of the application, a polishing machine and polishing agent can be used to polish the area to be repaired after the initial grinding of the cold weld repair. The polishing agent can be, but is not limited to, a special polishing agent that matches the material of the sheet metal part to be repaired, and the polishing speed is controlled at 1500-2500 r / min. The polishing time can be, but is not limited to, determined by professional technicians according to the area of ​​the area to be repaired and the surface roughness requirements (target roughness requirements), generally 2-5 min, so that the surface roughness Ra of the area to be repaired after cold weld repair is ≤0.8μm and the gloss is consistent with the surrounding surface. The sheet metal repair surface of the area to be repaired after cold weld repair is subjected to quality inspection until the surface roughness of the area to be repaired after cold weld repair reaches a certain roughness requirement, and the final repaired area is obtained.

[0059] This application embodiment utilizes cold welding technology to achieve a metallurgical bond between the repair material and the sheet metal substrate at low temperatures, completing the cold welding repair of the area to be repaired. After repair, fine polishing is performed, resulting in a final repair area with a gloss and hardness consistency of over 99% with the substrate. This ensures that the final repair area has no visual traces under multi-angle lighting, and the tactile flatness error is ≤0.01mm, improving the surface's corrosion resistance. The repaired sheet metal parts can maintain good appearance and performance for a long time, exhibiting excellent durability. This effectively meets the stringent requirements of high-end equipment manufacturing, automotive precision parts, and other fields for visually and tactilely flawless repair.

[0060] Optionally, in one embodiment of this application, spot welding repairs the area to be repaired to obtain the final repaired area, including: detecting the physical strength of the area to be repaired after spot welding repair; and obtaining the final repaired area if the physical strength meets the target strength requirement.

[0061] In other embodiments, this application may also test the physical strength of the repaired area after spot welding repair, so that after confirming that the physical strength of the repaired area meets the target strength requirements, all repairs of the repaired area are completed, and the final repaired area is obtained.

[0062] In this context, the physical strength of the area to be repaired after spot welding refers to the bonding strength between the weld point and the sheet metal substrate in the repaired area. The target strength requirement refers to a pre-set strength qualification standard for the repaired area. In this embodiment, it can be, but is not limited to, a physical strength of ≥90% for the repaired area, meaning the bonding strength between the weld point and the sheet metal substrate in the repaired area is ≥90%. The specific target strength requirement can be determined by those skilled in the art based on actual conditions. This embodiment is merely illustrative and does not impose specific limitations.

[0063] For example, after repairing scratches on a car door of a sheet metal substrate, this application can, but is not limited to, use a tensile shear test to test the bonding strength of the area to be repaired after cold welding repair. That is, a tensile testing machine is used to apply shear force to the area to be repaired after cold welding repair, and the maximum load-bearing strength is measured to be 265MPa. Assuming the original tensile strength of the substrate is 290MPa, the physical strength requirement of the area to be repaired after cold welding repair is: the physical strength of the area to be repaired after cold welding repair is greater than 90% of the original tensile strength of the substrate. 290MPa×90%=261MPa, 265MPa≥261MPa. Therefore, the physical strength of the area to be repaired after cold welding repair meets a certain strength requirement, and the area to be repaired after cold welding repair can be determined as the final repair area.

[0064] Additionally, practical experience shows that the dimensional accuracy deviation of the sheet metal parts after cold welding repair is ≤0.03mm, and the structural strength retention rate is over 98%, which is much higher than the 80-85% strength retention rate of welding technology in related existing technologies.

[0065] This application embodiment can use a cold welding process to achieve metallurgical bonding between the solder and the metal substrate, ensuring that the bonding strength, durability, and weather resistance of the final repaired area are far superior to the mechanical bonding of traditional putty or chemical fillers. After spot welding the repaired area, the physical strength of the repaired area is tested to ensure the structural strength of the final repaired area. This ensures that the repaired area will not become a weak point in the structure, avoids the risk of cracking and failure due to insufficient strength in subsequent use, avoids ineffective repairs that only focus on appearance and ignore strength, achieves dual qualification of seamless appearance and sufficient strength, and extends the overall service life of sheet metal parts.

[0066] Optionally, in one embodiment of this application, the repair pulse current, repair pulse time, welding frequency, and solder for repairing the area to be repaired are obtained based on the substrate material, damage depth, and sheet metal thickness. This includes: constructing a preset database for querying the repair pulse current, repair pulse time, and welding frequency based on the pulse current and feed rate corresponding to various substrate materials and damage depths; and obtaining the repair pulse current, repair pulse time, and welding frequency from the preset database based on the substrate material and damage depth.

[0067] In this context, pulsed current refers to the intermittent, high-energy current (discontinuous current) output through the welding electrode to the area to be repaired during spot welding repair, essentially the same as the repair pulsed current. Its value is directly related to the substrate material (such as steel / aluminum) and the depth of damage: high-strength steel requires a higher current to penetrate the substrate, deep damage requires a larger current to ensure penetration depth, and shallow damage requires a reduced current to avoid burn-through.

[0068] In this context, feed rate refers to the moving speed or feed rate of the welding electrode relative to the area to be repaired during spot welding repair. It determines the distribution density of weld points: the slower the feed rate, the more weld points per unit length; the faster the rate, the sparser the weld points. It is strongly correlated with the damage depth, i.e., deep damage (such as a 1mm scratch) requires a slow feed rate (dense weld points fill the damage), while shallow damage (such as a 0.3mm scratch) can be repaired with a fast feed rate (a small number of weld points are sufficient for reinforcement). At the same time, it needs to be matched with the pulse current and welding frequency.

[0069] The preset database here can be understood as a database of corresponding relationships built in advance based on a large amount of experimental data / engineering experience. The corresponding relationships are: "combination of substrate material + damage depth" and "repair pulse current, repair pulse time, welding frequency, feed speed". Among them, the feed speed is the basic parameter for building the database.

[0070] In short, the embodiments of this application can solidify the matching relationship between the combination of substrate material and damage depth and various spot welding repair parameters (repair pulse current, repair pulse time, welding frequency), avoiding recalculation for each repair and enabling quick parameter query and retrieval.

[0071] For example, in the embodiments of this application, data can be collected in advance through experiments. For instance, "ordinary cold-rolled (SPCC) + damage depth 0.5mm" corresponds to "pulse current 70A, repair pulse time 4ms, welding frequency 10Hz, feed speed 2mm / s"; "6061 aluminum alloy + damage depth 0.8mm" corresponds to "pulse current 160A, repair pulse time 6ms, welding frequency 15Hz, feed speed 1.5mm / s", etc. Thus, multiple sets of such data can be organized into a certain database.

[0072] In practical applications, if the area to be repaired is "ordinary cold-rolled steel (SPCC), damage depth 0.5mm, sheet metal thickness 1.2mm", then you can directly input this parameter combination into the database for querying, and quickly obtain the matching repair parameters: pulse current 70A, repair pulse time 4ms, welding frequency 10Hz.

[0073] This application's embodiments enable rapid parameter lookup by constructing a database, eliminating the need for parameter calculations for each repair and significantly improving repair efficiency. It can automatically match optimal cold welding parameters (current, feed rate, etc.) based on the substrate material and scratch depth of the sheet metal part to be repaired. Furthermore, multiple parameters can be optimized based on experimental data to ensure precise matching with the substrate material and damage depth, reducing quality issues such as burn-through and incomplete welds. This standardizes repair parameters, avoids human error, and guarantees consistent quality across different operators and batches, adapting to the needs of large-scale industrial production. Operators can be trained in 1-2 hours, resolving the experience-dependent problem of existing technologies and meeting the standardization and stability requirements of large-scale production.

[0074] The following is a detailed description of the sheet metal repair method based on multi-point cold welding in this application, using a specific embodiment.

[0075] Figure 2 This is a flowchart illustrating the repair of deep scratches on the sheet metal surface of an automobile door according to one embodiment of this application, as follows: Figure 2 As shown: Sheet metal workpiece information: a side panel of a family sedan, 0.65mm thick; the scratch is located in the middle of the door, 30mm long, 0.3mm deep, and 0.4mm wide, in a straight line, with the deepest part completely penetrating the clear coat and paint layer and damaging the metal substrate.

[0076] The equipment used includes: Cold welding host: integrates precision inverter power supply, pulse control module and cooling system, can output stable ultra-low current, high frequency pulse; Welding gun: special miniature welding gun, the gun head can be replaced with different execution ends (welding gun and push rod), suitable for the two most common types of sheet metal damage, surface scratches and small dents, facilitating precise operation; Argon gas: argon gas is used as a protective gas to ensure minimal heat input during welding; Matching tool set, including micro-area pretreatment tools, a series of fine grinding tools (miniature pneumatic grinder) and polishing tools (40 to 320 grit sandpaper); 0.8mm diameter steel welding wire (the welding wire is cut into 10cm pieces and the surface coating is removed with test paper).

[0077] Repair process: (1) Detecting the depth of sheet metal scratches: Scratch pretreatment: First, wipe the scratch area and the surrounding 50mm range with alcohol to remove oil and dust, and then use a depth gauge to detect the depth of the scratch. (2) Polishing the paint on the scratched surface: Then, use a pneumatic grinder with 40-grit sandpaper to polish the edges of the scratches, and control the rounding radius to 0.1-0.15mm; (3) Cold welding fills the scratches: Set the cold welding equipment parameters according to the existing sheet metal thickness in the workshop: control the pulse current at 24A, control the pulse time at 15ms, and control the welding frequency at 3 times / second; during the operation, the tungsten needle tip of the welding gun accurately fills the bottom of the scratches point by point and layer by layer with molten metal weld droplets; during the welding process, use a wet towel to cool the surface of the welded sheet metal to prevent the sheet metal temperature from being too high. (4) Grinding and fine grinding of weld seams: After the sheet metal has cooled down after welding, grind the weld seams. First, use 40-grit sandpaper to manually grind the repair area to remove small protrusions and welding slag. Then, use 240-grit sandpaper to grind the weld seams. Finally, use 320-grit sandpaper to fine grind the weld seams so that the repair area is smooth with the surrounding area. (5) Sheet metal repair is complete.

[0078] This application simplifies the sheet metal damage repair process, requiring only three core steps: pretreatment, cold welding filling, and fine polishing. With this simplified process, the cold welding process no longer requires prolonged curing or slow cooling, reducing the repair time for a single scratch by more than 50% compared to existing technologies. Specifically, the repair time for a single medium-depth scratch (3-5mm deep) can be controlled within 30 minutes, which is 80% shorter than the sheet metal filler method (2-3 hours) and 90% shorter than the welding filling method (4-5 hours). No additional investment is needed for straightening equipment or plating repair consumables, reducing the cost per piece by 40-60% compared to existing technologies. In batch repair scenarios (such as automotive aftermarket sheet metal repair), this significantly improves the economic benefits for businesses.

[0079] This application can cover sheet metal substrates with a thickness of 0.5-10mm and scratch depths of 0.1-8mm, and is compatible with surface-coated sheet metal parts, filling the gap in existing technologies for repairing thin-walled parts, coated parts, and medium-depth scratches. It is also adaptable to various metal materials (low-carbon steel, aluminum alloy, stainless steel, copper alloy, etc.), and the cold welding temperature will not damage the surface zinc or chromium plating. No equipment replacement or significant process adjustments are required, making it suitable for sheet metal scratch repair in various fields such as automobiles, construction machinery, precision instruments, and home appliances, with highly expandable application scenarios. It solves the technical shortcomings of related technologies, such as the inability of welding filling methods to adapt to thin-walled sheet metal parts (thickness ≤2mm) and surface-coated sheet metal parts (high temperatures easily damage the plating); poor repair effect of putty filling methods for scratches deeper than 5mm; and sandpaper polishing methods only being suitable for shallow surface scratches.

[0080] The sheet metal repair method based on multi-point cold welding proposed in this application can repair the area to be repaired by using specific repair pulse current, repair pulse time, welding frequency, and spot welding of the sheet metal, based on the substrate material, damage depth, and sheet metal thickness of the area to be repaired. This achieves the goal of ensuring the bonding strength of the final repaired area through matching the substrate material and the solder. Furthermore, molten metal weld droplets are precisely filled point-by-point and layer-by-layer to the bottom of the scratch using argon gas and a precision cold welding machine. The entire process is precisely controlled to ensure minimal heat input, avoiding deformation, oxidation, or performance degradation of the sheet metal due to high temperatures. This method is suitable for repairing thin-walled and high-precision sheet metal parts, and it ensures that the surface roughness of the repaired area is consistent with the surrounding surface, achieving truly seamless repair. It boasts high repair efficiency and stable quality, effectively meeting the needs of large-scale and standardized production. This solves the problems of related technologies, where various repair methods heavily rely on operator experience, leading to unstable repair quality due to human error, leaving obvious repair marks, potentially damaging the sheet metal substrate, resulting in low efficiency and high cost, and failing to meet the needs of large-scale and standardized production.

[0081] Next, referring to the accompanying drawings, a sheet metal repair device based on multi-point cold welding according to an embodiment of this application is described.

[0082] Figure 3 This is a schematic diagram of the sheet metal repair device based on multi-point cold welding according to an embodiment of this application.

[0083] like Figure 3 As shown, the sheet metal repair device 10 based on multi-point cold welding includes: a cleaning module 100, an acquisition module 200, and a repair module 300.

[0084] The cleaning module 100 is used to clean the area of ​​the sheet metal part to be repaired and to detect the cleanliness of the area to be repaired. If the cleanliness meets the target requirements, it can obtain the substrate material, damage depth, and sheet metal thickness of the area to be repaired. The acquisition module 200 is used to acquire the repair pulse current, repair pulse time, welding frequency, and solder for repairing the area to be repaired based on the substrate material, damage depth, and sheet metal thickness. The repair module 300 is used to spot weld the area to be repaired based on the repair pulse current, repair pulse time, welding frequency, and solder to obtain the final repaired area.

[0085] Optionally, in one embodiment of this application, the repair module 300 includes: a first detection unit for detecting the ambient gas in the area to be repaired; and a repair unit for spot welding the area to be repaired when the ambient gas is argon.

[0086] Optionally, in one embodiment of this application, the repair module 300 includes: a second detection unit for detecting the ambient temperature of the area to be repaired after spot welding repair; and a grinding unit for grinding the area to be repaired after spot welding repair when the ambient temperature meets the target temperature requirement, until the surface roughness of the area to be repaired after spot welding repair reaches the target roughness requirement, thereby obtaining the final repaired area.

[0087] Optionally, in one embodiment of this application, the repair module 300 includes: a third detection unit for detecting the physical strength of the area to be repaired after spot welding repair; and a determination unit for obtaining the final repair area when the physical strength meets the target strength requirement.

[0088] Optionally, in one embodiment of this application, the acquisition module 200 includes: a construction unit, configured to construct a preset database for querying repair pulse current, repair pulse time, and welding frequency based on pulse current and feed speed corresponding to various substrate materials and various damage depths; and an acquisition unit, configured to acquire repair pulse current, repair pulse time, and welding frequency from the preset database based on substrate material and damage depth.

[0089] It should be noted that the foregoing explanation of the sheet metal repair method based on multi-point cold welding also applies to the sheet metal repair device based on multi-point cold welding in this embodiment, and will not be repeated here.

[0090] The sheet metal repair device based on multi-point cold welding proposed in this application can repair the area to be repaired based on the substrate material, damage depth, and sheet metal thickness of the area to be repaired. This is achieved by using specific repair pulse current, repair pulse time, welding frequency, and spot welding with solder to obtain the final repaired area. This ensures the bonding strength of the final repaired area through matching the substrate material and the solder. Furthermore, molten metal weld droplets are precisely filled point-by-point and layer-by-layer to the bottom of the scratch using argon gas and a precision cold welding machine. The entire process is precisely controlled to ensure minimal heat input, avoiding deformation, oxidation, or performance degradation of the sheet metal parts due to high temperatures. It is suitable for repairing thin-walled and high-precision sheet metal parts, and can maintain a consistent surface roughness between the repaired area and the surrounding surface, achieving truly seamless repair. The repair efficiency is high, and the quality is stable, effectively meeting the needs of large-scale and standardized production. This solves the problems in related technologies, where various repair methods heavily rely on operator experience, leading to unstable repair quality due to human error, leaving obvious repair marks, potentially damaging the sheet metal substrate, resulting in low efficiency and high cost, and failing to meet the needs of large-scale and standardized production.

[0091] Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include: The memory 401, the processor 402, and the computer program stored on the memory 401 and capable of running on the processor 402.

[0092] When the processor 402 executes the program, it implements the sheet metal repair method based on multi-point cold welding provided in the above embodiments.

[0093] Furthermore, electronic devices also include: Communication interface 403 is used for communication between memory 401 and processor 402.

[0094] The memory 401 is used to store computer programs that can run on the processor 402.

[0095] Memory 401 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage.

[0096] If the memory 401, processor 402, and communication interface 403 are implemented independently, then the communication interface 403, memory 401, and processor 402 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized into address buses, data buses, control buses, etc. For ease of representation, Figure 4 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0097] Optionally, in a specific implementation, if the memory 401, processor 402, and communication interface 403 are integrated on a single chip, then the memory 401, processor 402, and communication interface 403 can communicate with each other through an internal interface.

[0098] Processor 402 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0099] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described sheet metal repair method based on multi-point cold welding.

[0100] This application also provides a computer program product, including a computer program that can run computer instructions. When the computer instructions are executed by a processor, they implement the sheet metal repair method based on multi-point cold welding provided in this application.

[0101] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate 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 this application. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0102] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0103] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0104] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0105] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or more of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0106] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0107] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0108] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A sheet metal repair method based on multi-point cold welding, characterized in that, Includes the following steps: Clean the area of ​​the sheet metal part to be repaired and test the cleanliness of the area of ​​the sheet metal part to be repaired, so as to obtain the base material, damage depth and sheet metal thickness of the area to be repaired if the cleanliness meets the target requirements. Based on the substrate material, the damage depth, and the sheet metal thickness, the repair pulse current, repair pulse time, welding frequency, and solder used to repair the area to be repaired are obtained. Based on the repair pulse current, the repair pulse time, the welding frequency, and the solder, the area to be repaired is spot welded to obtain the final repaired area.

2. The method according to claim 1, characterized in that, The method of spot welding to repair the area to be repaired based on the repair pulse current, the repair pulse time, the welding frequency, and the solder includes: Detect the ambient gas in the area to be repaired; When the ambient gas is argon, the area to be repaired is repaired by spot welding.

3. The method according to claim 1, characterized in that, The spot welding repairs the area to be repaired, resulting in a final repaired area, including: Detect the ambient temperature of the area to be repaired after spot welding repair; When the ambient temperature meets the target temperature requirement, the area to be repaired after spot welding is ground until the surface roughness of the area to be repaired after spot welding reaches the target roughness requirement, thus obtaining the final repaired area.

4. The method according to claim 1, characterized in that, The spot welding repairs the area to be repaired, resulting in a final repaired area, including: Test the physical strength of the area to be repaired after spot welding repair; The final repair area is obtained when the physical strength meets the target strength requirement.

5. The method according to claim 1, characterized in that, The step of obtaining the repair pulse current, repair pulse time, welding frequency, and solder for repairing the area to be repaired based on the substrate material, the damage depth, and the sheet metal thickness includes: Based on pulse current and feed rate corresponding to various substrate materials and various damage depths, a preset database is constructed for querying the repair pulse current, the repair pulse time and the welding frequency; Based on the substrate material and the damage depth, the repair pulse current, the repair pulse time, and the welding frequency are obtained from the preset database.

6. A sheet metal repair device based on multi-point cold welding, characterized in that, include: The cleaning module is used to clean the area of ​​the sheet metal part to be repaired and to detect the cleanliness of the area of ​​the sheet metal part to be repaired. If the cleanliness meets the target requirements, the module can obtain the substrate material, damage depth and sheet metal thickness of the area to be repaired. The acquisition module is used to acquire, based on the substrate material, the damage depth, and the sheet metal thickness, the repair pulse current, repair pulse time, welding frequency, and solder used to repair the area to be repaired. The repair module is used to spot weld and repair the area to be repaired based on the repair pulse current, the repair pulse time, the welding frequency, and the solder, to obtain the final repaired area.

7. The apparatus according to claim 6, characterized in that, The repair module includes: The detection unit is used to detect the ambient gas in the area to be repaired; The repair unit is used to spot weld and repair the area to be repaired when the ambient gas is argon.

8. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the sheet metal repair method based on multi-point cold welding as described in any one of claims 1-5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the sheet metal repair method based on multi-point cold welding as described in any one of claims 1-5.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed, it is used to implement the sheet metal repair method based on multi-point cold welding as described in any one of claims 1-5.

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