Control method for zinc stacking at welding point of resistance spot welding of low-melting-point coating

Abstract

The invention discloses a low-melting-point coating resistance spot welding spot zinc stacking control method, and relates to the technical field of welding, the method comprises the following steps: controlling an electrode rod to conduct current to a test plate group so as to form a welding spot and a low-melting-point coating on the surface of the test plate group, and generating zinc stacking around the welding spot; under the condition of resistance spot welding heating, the low-melting-point plating layer is heated to form a heat affected zone on the periphery of the electrode rod; and applying air flow with preset strength to the heat affected zone, so that the zinc heap is uniformly spread on the surface of the test plate group.

Description

Technical Field

[0001] The present application relates to the field of welding technology, and in particular to a method for controlling zinc deposition at a low-melting-point coating resistance spot welding spot. Background Art

[0002] At present, with the increasing requirements for corrosion resistance in the fields of automobiles, home appliances, etc., coated steel sheets are gradually replacing uncoated products such as cold-rolled, hot-rolled, pickled, etc.; resistance spot welding is a high-speed and economical connection method, which is widely used in the fields of automobiles, home appliances, etc. With the increasing requirements for material performance and corrosion resistance in the manufacturing industry, many metal sheets are coated with a layer of low-melting-point metals, such as zinc, to enhance their corrosion resistance. However, during the resistance spot welding process, zinc accumulation occurs due to the following reasons: First, the melting point of zinc is relatively low (about 420°C), and it is easy to melt under the high temperature and pressure during spot welding. The molten zinc has good fluidity and is easy to gather at the weld. Secondly, if the parameters of welding current and pressure are set unreasonably, it may lead to uneven heat distribution in the welding area, causing excessive melting and flow of zinc in some areas, thus forming zinc accumulation. In addition, the interaction between the electrode and the coating material will also affect the distribution of zinc. For example, improper selection of electrode materials may increase the adhesion and accumulation of zinc at the weld.

[0003] However, this zinc deposition phenomenon will have an adverse effect on the quality of the weld, such as reducing the strength, conductivity and corrosion resistance of the weld, and may also affect the appearance and dimensional accuracy of the weld, thereby reducing the reliability and service life of the product in practical applications. Low-melting-point coated steel plates will melt during resistance spot welding, and zinc deposition defects will occur under the action of the magnetic field, affecting the flatness of the weld appearance. Manual polishing is required, which is time-consuming and labor-intensive, and the destruction of the coating will affect the corrosion resistance of the weld. At present, there is no appropriate method to solve the above problems. Therefore, it is necessary to propose a control method for zinc deposition of low-melting-point coated resistance spot welding welds to at least solve some of the above problems. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In a first aspect, an embodiment of the present application provides a method for controlling zinc deposition at a low-melting-point coating resistance spot welding spot, the method comprising:

[0006] Controlling the electrode rod to conduct current to the test plate group to form welding spots and low-melting-point coatings on the surfaces of the test plate group, and generating zinc deposits around the welding spots;

[0007] In the case of resistance spot welding heating, the low melting point coating is heated to form a heat affected zone around the electrode rod;

[0008] An airflow of a preset intensity is applied to the heat-affected zone so that the zinc buildup is evenly spread on the surface of the test plate group.

[0009] In one embodiment of the present invention, the low-melting-point coating includes hot-dip galvanizing coating, aluminum-zinc coating, zinc-aluminum-magnesium coating and electro-galvanizing coating.

[0010] In one embodiment of the present invention, the temperature of the gas flow is less than 800 degrees Celsius, and the melting point is controlled at -100°C.

[0011] In one embodiment of the present invention, the angle between the direction of the airflow and the electrode rod is 20 degrees to 70 degrees.

[0012] In one embodiment of the present invention, the gas is a non-flammable gas.

[0013] In one embodiment of the present invention, when the gas contains oxygen, the oxygen content is less than 50%.

[0014] In one embodiment of the present invention, the flow rate of the gas is greater than 5 liters / minute.

[0015] In one embodiment of the present invention, the temperature of the gas is between -20 degrees Celsius and 25 degrees Celsius.

[0016] In one embodiment of the present invention, the volume fraction of nitrogen in the gas is 78%, the volume fraction of oxygen is 21%, the volume fraction of rare gas is 0.934%, the volume fraction of carbon dioxide is 0.04%, and the volume fraction of other substances is 0.026%.

[0017] In one embodiment of the present invention, the electrode rod is chromium-zirconium-copper.

[0018] In summary, a control method for zinc deposition on a low-melting-point coating resistance spot welding weld in an embodiment of the present application includes: controlling the electrode rod to conduct current to the test plate group to form a weld and a low-melting-point coating on the surface of the test plate group, and generating zinc deposition around the weld; when the resistance spot welding is heated, the low-melting-point coating is heated to form a heat-affected zone around the electrode rod; and applying a gas flow of a preset intensity to the heat-affected zone to make the zinc deposition evenly spread on the surface of the test plate group. By applying a certain intensity of gas flow during the resistance spot welding heating stage, the local high pressure is used to act on the surface of the weld to offset the outward thrust of the magnetic field on the zinc. At the same time, the longitudinal force can compress the volume of the zinc deposition and reduce the height of the zinc deposition. The gas flow is non-contact with the electrode rod of the resistance spot welding, which is convenient for installation and coordination with existing resistance spot welding equipment; at the same time, the gas device can be very small and flexibly installed without interfering with the resistance spot welding and the workpiece.

[0019] The control method for zinc deposition of low-melting-point coating resistance spot welding welds proposed in this application, and other advantages, objectives and features of this application will be partially reflected through the following description, and will also be partially understood by technicians in this field through research and practice of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present specification. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0021] Figure 1 A schematic diagram of the process of controlling zinc deposition of a low-melting-point coating resistance spot welding weld provided in an embodiment of the present application;

[0022] Figure 2 A forming effect diagram of a traditional welding process in a control method for zinc deposition at a low-melting-point coating resistance spot welding weld provided in an embodiment of the present application;

[0023] Figure 3 This is a forming effect diagram of the welding process in a control method for zinc deposition on a low-melting-point coating resistance spot welding weld provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0025] In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. The term "more than two" includes two or more than two situations.

[0026] See also Figure 1 , which is a schematic flow diagram of a control method for zinc deposition at a low-melting-point coating resistance spot welding weld provided in an embodiment of the present application, and may specifically include:

[0027] S110, controlling the electrode rod to conduct current to the test plate group, so as to form a welding spot and a low-melting-point coating on the surface of the test plate group, and generate a zinc pile around the welding spot;

[0028] For example, the test plate combination consists of two test plates. The first test plate is made of DX54D+Z, has a thickness of 0.65 mm, and a coating weight of 100 g / m2 on both sides. 2 The surface of the test plate is smooth and has good ductility and stamping performance. The second test plate is made of DP980+Z, with a thickness of 1.4mm and a coating weight of 100g / m2 on both sides. 2 DP980 is a high-strength dual-phase steel with excellent strength and toughness, and is widely used in structural parts that bear heavy loads.

[0029] The electrode rod needs to be kept perpendicular to the surface of the test plate group to ensure that the applied pressure is evenly distributed in the contact area, so that the current can be vertically introduced into the test plate group after passing through the electrode rod, thereby improving the efficiency and stability of current conduction. After the current is conducted to the test plate group, a weld point is formed at the position where the electrode rod contacts the test plate group, and a low-melting-point coating is formed on the surface of the test plate group. At the same time, if the current is too large or the welding time is too long, it will lead to excessive deposition of zinc during the welding process, thereby forming a zinc pile around the weld point.

[0030] S120, when heating by resistance spot welding, the low melting point coating is heated to form a heat affected zone around the electrode rod;

[0031] For example, during the heating process of resistance spot welding, the low-melting-point coating will melt before the base material due to its relatively low melting point. At this time, the heat will be conducted from the welding point to the surrounding area, so that the coating area around the electrode rod is also affected by heat, thus forming a heat-affected zone.

[0032] S130, applying an airflow of a preset intensity to the heat-affected zone to make the zinc buildup evenly spread on the surface of the test plate group.

[0033] Illustratively, during the heating stage of resistance spot welding, an airflow of preset intensity is applied to the heat-affected zone around the electrode rod. Since the airflow can change the local pressure and flow field environment around the zinc pile, the local high pressure is used to act on the weld surface to offset the outward thrust of the magnetic field on the zinc, thereby pushing and dispersing the zinc pile, thereby reducing the height of the zinc pile, promoting a more even distribution on the surface of the test plate group, and making the zinc pile evenly spread on the surface of the test plate group.

[0034] In summary, the control method for zinc piling of low-melting-point coating resistance spot welding welds proposed in the embodiment of the present application, by applying a certain intensity of airflow during the heating stage of resistance spot welding, using local high pressure to act on the surface of the weld, offsetting the outward thrust of the magnetic field on the zinc, and at the same time, the longitudinal force can compress the volume of the zinc piling and reduce the height of the zinc piling. The airflow is non-contact with the electrode rod of the resistance spot welding, which is convenient for installation and coordination with existing resistance spot welding equipment; at the same time, the gas device can be very small and flexibly installed, and does not interfere with the resistance spot welding and the workpiece.

[0035] In some examples, the low-melting-point coating includes hot-dip galvanizing coating, aluminum-zinc coating, zinc-aluminum-magnesium coating, and electro-galvanizing coating.

[0036] Exemplarily, low melting point coatings include hot-dip galvanizing, aluminum-zinc coatings, zinc-aluminum-magnesium coatings, and electro-galvanizing. Hot-dip galvanizing has excellent corrosion resistance, can resist corrosion for a long time in harsh environments, and effectively prolongs the service life of the plated parts. It has good wear resistance and can withstand a certain degree of friction and wear. The cost is relatively low, the adhesion strength is high, the coating is tightly combined with the base metal, and it is not easy to peel off. It has a wide range of applications and low maintenance costs.

[0037] Aluminum-zinc coating has excellent corrosion resistance and high temperature resistance. It can maintain stable performance in high temperature environment and is not prone to oxidation and corrosion. It has self-repairing ability. After the coating is damaged, it can self-repair to a certain extent to prevent further spread of corrosion. It has a longer service life and can provide more lasting protection and reduce the frequency of maintenance and replacement compared to traditional coatings. It has good thermal oxidation resistance. Under high temperature conditions, the oxide film formed on the surface can prevent further oxidation. It has high strength and can enhance the overall strength and hardness of the plated parts.

[0038] The zinc-aluminum-magnesium coating has super corrosion resistance. Under the condition of the same coating thickness, its corrosion resistance is significantly better than that of traditional galvanized products. It has the ability of self-repairing of cuts. Even if the coating is cut during processing, it can effectively inhibit the generation of red rust and has excellent cut protection performance. It has good friction resistance and can withstand a certain degree of friction and wear. It has excellent resistance to sub-film corrosion and can maintain a good anti-corrosion effect even when the coating is damaged. It has good formability and paintability, which is convenient for various processing and subsequent painting treatments. It has a lower coating weight, which can reduce the thickness and weight of the coating while providing the same protection effect, thereby reducing costs. It has long-lasting corrosion resistance and a long service life in harsh environments, reducing the need for maintenance and replacement.

[0039] The electroplated zinc coating has the characteristics of high surface quality. The coating is uniform, smooth, delicate and has a good appearance. The thickness control is accurate: the thickness of the coating can be accurately controlled by adjusting the current, time and other parameters. It has good anti-corrosion performance and can provide a certain degree of anti-corrosion protection for the substrate. It has good bonding strength, and the coating is firmly bonded to the substrate metal.

[0040] In some examples, the temperature of the gas stream is less than 800 degrees Celsius, and the melting point is controlled at -100 degrees Celsius.

[0041] For example, the temperature of the airflow needs to be less than 800 degrees Celsius and controlled at -100 degrees Celsius from the melting point. If the temperature is higher than 800 degrees Celsius, the bonding force between the liquid zinc and the steel plate is weakened, which easily forms reverse zinc stacking. At the same time, at this temperature, zinc oxide is easily formed, reducing the corrosion resistance of the weld; if it is below -100 degrees Celsius from the melting point, the high-temperature plasticity of zinc is weak, and the air pressure cannot act to offset the electromagnetic force, and cannot inhibit the flow of zinc.

[0042] In some examples, the angle between the direction of the airflow and the electrode rod is 20 degrees to 70 degrees.

[0043] For example, when the angle is within this range, there is both a lateral thrust to offset the electromagnetic force, and a force perpendicular to the direction of zinc stacking at the weld point to spread the thermoplastic or molten zinc layer and reduce the zinc stacking height, which can effectively optimize the airflow on the environment around the electrode rod. If the angle is less than 20 degrees, the impact force and coverage of the airflow will be greatly reduced, making it difficult to achieve the expected cleaning, cooling or other related effects. On the contrary, if the angle is greater than 70 degrees, the airflow may be too dispersed and unable to focus on key areas, resulting in energy waste and reduced efficiency.

[0044] In some examples, the gas is a non-flammable gas.

[0045] Exemplarily, non-combustible gas can form a protective atmosphere to prevent the welding area from reacting with oxygen, nitrogen, etc. in the air at high temperature, avoiding the production of oxides and nitrides, thereby ensuring the quality and performance of the weld. It can reduce metal splashing during spot welding. The presence of gas can suppress the violent fluctuation of the welding molten pool to a certain extent, reduce the splash loss of liquid metal, and improve the utilization rate of materials. It helps to dissipate heat. A large amount of heat will be generated during welding, and non-combustible gas can take away part of the heat to prevent the weld from overheating and affecting the performance of surrounding materials. It can stabilize the welding arc. It provides a stable combustion environment for the arc, so that the arc energy is concentrated and stable, thereby ensuring that the size and shape of the weld are uniform. The use of non-combustible gas can improve the repeatability and reliability of spot welding. Under the same gas protection conditions, the effect of each spot welding is closer, which is conducive to ensuring the consistency of product quality. Common non-combustible gases such as air, carbon dioxide, nitrogen, argon and other non-combustible gases will produce splashes during welding, and the use of non-combustible gas can prevent explosions.

[0046] In some examples, when the gas includes oxygen, the oxygen content is less than 50%.

[0047] For example, if the gas contains oxygen, the oxygen content is less than 50%. When spot welding, it is usually desirable to minimize the contact of the weld area with oxygen to prevent the formation of zinc oxide and other adverse chemical reactions after oxidation. If zinc oxide is formed after oxidation, the corrosion resistance of the weld will be reduced. In general, a higher oxygen content may increase the risk of oxidation and affect the quality and performance of the weld, such as reducing the strength and corrosion resistance of the weld.

[0048] In some examples, the flow rate of the gas is greater than 5 liters / minute.

[0049] Exemplarily, the mass of gas passing through the test plate group per minute is greater than 5 liters. A larger gas flow rate can more quickly and thoroughly expel the air around the welding area, reduce the adverse effects of oxygen, nitrogen, etc. on the welding process, and thus improve the quality of the weld. Ensure that during the welding process, the shielding gas can fully cover and protect the welding pool and heat-affected zone to prevent the intrusion of oxidation and other impurities. It helps to quickly take away the large amount of heat generated during the welding process, prevent local overheating, and improve the microstructure and performance of the welded joint. The stable airflow can provide a more stable combustion environment for the arc, reduce the fluctuation of the arc, make the welding process more stable, and improve the consistency of welding quality.

[0050] In some examples, the temperature of the gas is between -20 degrees Celsius and 25 degrees Celsius.

[0051] Exemplarily, setting the temperature of the gas between -20 degrees Celsius and 25 degrees Celsius can help prevent excessive thermal deformation of the weldment due to overheating during the welding process, thereby improving the dimensional accuracy and shape stability of the weldment. The low-temperature gas environment can inhibit the reaction of the weldment and electrode with the surrounding oxygen to a certain extent, reduce the formation of the oxide layer, and improve the welding quality. The gas protection effect can also be enhanced. Low temperature may increase the density of the shielding gas, enhance the coverage and protection of the welding area, and reduce the intrusion of harmful gases. The heat-affected zone can be controlled, which helps to reduce the scope of the heat-affected zone and reduce the adverse effects on the properties of the parent material. The life of the electrode can be extended. The lower gas temperature may help to take away some of the heat generated by the electrode during operation, reduce the heating rate of the electrode, and thus extend the service life of the electrode.

[0052] In some examples, the volume fraction of nitrogen in the gas is 78%, the volume fraction of oxygen is 21%, the volume fraction of rare gas is 0.934%, the volume fraction of carbon dioxide is 0.04%, and the volume fraction of other substances is 0.026%.

[0053] For example, nitrogen accounts for 78%. Nitrogen is an inert gas that can play a protective role during the welding process, preventing the metal from undergoing a violent oxidation reaction with oxygen at high temperature, thereby reducing oxide inclusions in the weld and improving welding quality. 21% of oxygen contributes to the formation of an oxide film on the surface of certain metals during welding. This oxide film can prevent further oxidation to a certain extent and may improve the metallurgical properties of the weld. 0.934% of rare gases are inert and stable, which can enhance the stability and uniformity of the shielding gas and further improve the protection effect. 0.04% of carbon dioxide may help regulate the stability of the welding arc and the fluidity of the molten pool. This relatively stable and balanced gas composition ratio helps to create a stable welding environment, make the welding process more controllable, reduce the occurrence of welding defects, and improve the strength and toughness of the welded joint and other properties.

[0054] In some examples, the electrode rod is chromium zirconium copper.

[0055] Exemplarily, chromium-zirconium copper has a high electrical conductivity and can effectively conduct electric current, ensuring the stable passage of current during spot welding, and improving welding efficiency and quality. It also has high hardness and strength, enabling it to withstand the mechanical pressure and wear during spot welding, not easily deformed, and extending the service life of the electrode rod. It has good wear resistance: in frequent spot welding operations, it can withstand contact and friction with the workpiece and reduce the loss of the electrode rod. It has anti-softening properties, and is not easy to soften in a high-temperature working environment, maintaining its mechanical properties and electrical conductivity, and ensuring the stability and reliability of spot welding. It has good thermal conductivity, which helps to quickly dissipate the heat generated during welding, reduce the temperature of the electrode rod, and reduce the impact of overheating on its performance.

[0056] The present invention is described in detail below in conjunction with the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0057] Example:

[0058] The test plate group consists of two test plates. The first test plate is made of DX54D+Z with a thickness of 0.65mm. The coating weight is 100g / m2 on both sides. The second test plate is made of DP980+Z with a thickness of 1.4mm and a coating weight of 100g / m2 on both sides. The electrode material is chromium zirconium copper with an electrode end surface of 6mm. Other welding process parameters are shown in Table 1.

[0059] Table 1:

[0060] Pre-pressing time Welding pressure Welding current Welding time Keep time 600ms 3.5kN 7.5kA 238ms 200ms

[0061] The electrode material is chromium zirconium copper, and the electrode end surface is 6mm. The gas flow used in this application is air flow, the volume fraction of nitrogen is 78%, the volume fraction of oxygen is 21%, the volume fraction of rare gases (helium, neon, argon, krypton, xenon, radon) is about 0.934%, the volume fraction of carbon dioxide is 0.04%, and the volume fraction of other substances is 0.026%. The air flow area is the overall heat affected zone of the weld, the air flow and angle are 60 degrees, the purge temperature range is 500-600 degrees Celsius, the air flow temperature is 20°C, and the gas flow rate is 5 liters / minute.

[0062] like Figure 2 As shown in the figure, this application proposes a method for controlling zinc deposition of a low-melting-point coating resistance spot welding weld point. In the prior art, the low-melting-point coating steel plate will melt during resistance spot welding, and zinc deposition defects will occur under the action of the magnetic field, affecting the flatness of the weld appearance. Figure 3As shown, this is a forming effect diagram of the welding process in a control method for zinc piling of a low-melting-point coating resistance spot welding weld proposed in this application. In this application, a certain intensity of airflow is applied during the heating stage of resistance spot welding, and local high pressure is used to act on the surface of the weld to offset the outward thrust of the magnetic field on the zinc. At the same time, the longitudinal force can compress the volume of the zinc piling and reduce the height of the zinc piling. The airflow is non-contact with the electrode rod of the resistance spot welding, which is convenient for installation and coordination with existing resistance spot welding equipment; at the same time, the gas device can be very small and flexibly installed, and does not interfere with the resistance spot welding and the workpiece.

[0063] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0064] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-readable program code.

[0065] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0066] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0067] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0068] An embodiment of the present application also provides a computer program product, which includes computer software instructions. When the computer software instructions are executed on a processing device, the processing device executes the process of the LDPC decoding method of the solid-state hard disk controller.

[0069] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a server or a data center that includes one or more available media integration. The available medium can be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state drive (SSD)), etc.

[0070] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0071] In the several embodiments provided in the present application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0072] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0073] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0074] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[0075] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0076] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0077] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

[0078] Although the preferred embodiments of this specification have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of this specification.

[0079] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and variations of this specification fall within the scope of the claims of this specification and their equivalents, this specification is also intended to include these modifications and variations.

Claims

1. A control method for zinc deposition of low melting point coating resistance spot welding welds, characterized in that: The method comprises: Controlling the electrode rod to conduct current to the test plate group to form welding spots and low-melting-point coatings on the surfaces of the test plate group, and generating zinc deposits around the welding spots; In the case of resistance spot welding heating, the low melting point coating is heated to form a heat affected zone around the electrode rod; An airflow of a preset intensity is applied to the heat-affected zone so that the zinc buildup is evenly spread on the surface of the test plate group.

2. The control method for zinc piling of a low melting point coating resistance spot welding weld according to claim 1, characterized in that: The low melting point coating includes hot dip galvanizing coating, aluminum zinc coating, zinc aluminum magnesium coating and electro zinc coating.

3. The control method for zinc piling of a low melting point coating resistance spot welding weld according to claim 1, characterized in that: The temperature of the gas flow is less than 800 degrees Celsius, and the melting point is controlled at -100 degrees Celsius.

4. The control method for zinc piling of a low melting point coating resistance spot welding weld according to claim 1, characterized in that: The angle between the direction of the airflow and the electrode rod is 20 degrees to 70 degrees.

5. The control method for zinc deposition of a low melting point coating resistance spot welding spot according to claim 1, characterized in that: The gas is non-flammable gas.

6. The control method for zinc deposition of a low melting point coating resistance spot welding weld according to claim 1, characterized in that: In case oxygen is included in the gas, the oxygen content is less than 50%.

7. The control method for zinc deposition of a low melting point coating resistance spot welding weld according to claim 1, characterized in that: The flow rate of the gas is greater than 5 liters / minute.

8. The control method for zinc deposition of a low melting point coating resistance spot welding weld according to claim 1, characterized in that: The temperature of the gas is between -20 degrees Celsius and 25 degrees Celsius.

9. The control method for zinc deposition of a low melting point coating resistance spot welding weld according to claim 1, characterized in that: The volume fraction of nitrogen in the gas is 78%, the volume fraction of oxygen is 21%, the volume fraction of rare gas is 0.934%, the volume fraction of carbon dioxide is 0.04%, and the volume fraction of other substances is 0.026%.

10. The method for controlling zinc deposition of a low melting point coating resistance spot welding spot according to claim 1, characterized in that: The electrode rod is made of chromium-zirconium-copper.

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