Welding device

Abstract

The utility model discloses a welding device which comprises a positive electrode, a negative electrode and a cushion block. The positive electrode and the negative electrode are arranged on the same side of the resistance welding plate, and the cushion block is arranged on the other side, opposite to the positive electrode and the negative electrode, of the resistance welding plate; the electric resistance welding plate is used for generating heat when current between the positive electrode and the negative electrode passes through the electric resistance welding plate so as to weld welding spots on the electric resistance welding plate; the cushion block is used for supporting the resistance welding plate and pressing the resistance welding plate together with the positive electrode and the negative electrode.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to the technical field of automation equipment, and particularly relates to a welding device. BACKGROUND

[0002] In modern industrial production, welding as a key connection process is widely used in various fields, especially in the industry involving metal material connection, such as automobile manufacturing, electronic equipment production, aerospace, etc. As an efficient welding method, resistance welding generates resistance heat through current passing through the contact point of the welding piece, locally heats and fuses the welding piece, and thus realizes connection.

[0003] The traditional resistance welding device faces many problems in actual application. In the conventional resistance welding equipment, the setting mode of the positive and negative electrodes may cause uneven current distribution, so that the welding points on the resistance welding plate are not uniformly heated. The flatness of the positive and negative electrode plates cannot completely reach flatness, and when welding a certain welding point on the nickel foam plate, the gap between the negative electrode block and the anode substrate causes arc discharge phenomenon, which causes arc injury on the anode substrate to produce traces. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of welding device to reach the purpose of solving at least one defect existing in prior art.

[0005] The embodiment of the utility model provides a kind of welding device, comprising: positive electrode, negative electrode and cushion block;

[0006] The positive electrode and the negative electrode are arranged on the same side of the resistance welding plate, and the cushion block is arranged on the other side of the resistance welding plate opposite to the positive electrode and the negative electrode;

[0007] The resistance welding plate is used to generate heat when the current between the positive electrode and the negative electrode passes through the resistance welding plate to weld the welding points on the resistance welding plate;

[0008] The cushion block is used to support the resistance welding plate and simultaneously realize the compression of the resistance welding plate with the positive electrode and the negative electrode.

[0009] Optionally, it further includes a discharge transformer and a bus bar, the positive electrode is connected with the positive electrode of the discharge transformer through the bus bar, and the negative electrode is connected with the negative electrode of the discharge transformer through the bus bar.

[0010] Optionally, one negative electrode is connected with the bus bar through two cables.

[0011] Optionally, the bus bar is provided with an insulating layer, and the cable connecting the negative electrode and the bus bar is fixed on the insulating layer.

[0012] Optionally, the cushion block is made of glass fiber or stainless steel.

[0013] Optionally, the resistance welding plate is made of nickel foam plate.

[0014] Optionally, the welding current between the positive electrode and the negative electrode is 2.4KA.

[0015] Optionally, the positive electrode and the negative electrode are further provided with a pressing mechanism, which is used to apply a pressing force to the resistance welding plate when welding the resistance welding plate.

[0016] Optionally, two welding points are formed at the positive electrode and the negative electrode during welding.

[0017] Optionally, the negative electrode is made of tungsten steel.

[0018] Compared with the prior art, the welding device has the advantages that: the welding device includes a positive electrode, a negative electrode and a cushion block, the positive electrode and the negative electrode are arranged on the same side of the resistance welding plate, and current generates heat through the resistance welding plate. This layout changes the current direction during traditional welding, avoids the gap between the electrode plate and the negative electrode block caused by uneven current distribution. Under the traditional mode, the current direction may cause the electrode plate anode substrate to bear uneven pressure and thermal stress, which is easy to cause bending deformation and gap, and causes arc to injure the nickel layer on the surface of the electrode plate. The current path is optimized in this scheme, which reduces the risk of arc caused by the gap from the root, greatly reduces the possibility of damage to the nickel layer on the surface of the electrode plate, prolongs the service life of the electrode plate, and reduces the equipment maintenance cost.

[0019] The cushion block is arranged on the other side of the resistance welding plate and cooperates with the positive electrode and the negative electrode to press the resistance welding plate. This structural design enhances the stability of the entire welding device and further avoids the gap caused by loose or displacement of the components. The stable structure makes the current conduction more stable, reduces the current fluctuation caused by unstable structure, effectively prevents the damage of the arc to the nickel layer on the surface of the electrode plate, and ensures the reliability and continuity of the welding process.

[0020] Unlike the traditional single-point sequential welding method, the present scheme realizes two-point simultaneous welding. In traditional welding, only one welding point can be welded at a time, and multiple welding operations are required to complete the welding task of multiple welding points, which takes a long time. The device can simultaneously weld two welding points through reasonable arrangement of the positive electrode, the negative electrode and the resistance welding plate.

[0021] Two points are welded simultaneously, which reduces the waiting time and idle time of the welding equipment. In the traditional welding mode, the welding equipment needs to move to the position of the next welding point after completing a welding point, which consumes a certain amount of time. However, the present scheme simultaneously welds two welding points, reduces the number of times of moving and positioning of the equipment, shortens the entire welding cycle, enables more welding tasks to be completed in unit time, and improves the overall output efficiency of the production line. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural block diagram of the welding device in the embodiment. DETAILED DESCRIPTION

[0023] The present utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, but not to limit the present utility model. In addition, it should be noted that, in order to facilitate description, only the parts related to the present utility model are shown in the drawings, not all the structures.

[0024] Figure 1 is a structural block diagram of the welding device in the embodiment, referring to Figure 1 , the welding device comprises: a positive electrode 101, a negative electrode 102 and a pad block (pad blocks 1-3);

[0025] The positive electrode 101 and the negative electrode 102 are arranged on the same side of the resistance welding plate 103, and the pad block is arranged on the other side of the resistance welding plate 103 opposite to the positive electrode 101 and the negative electrode 102;

[0026] The resistance welding plate 103 is used to generate heat when the current between the positive electrode 101 and the negative electrode 102 passes through the resistance welding plate 103, so as to weld the workpiece 1;

[0027] The pad block is used to support the resistance welding plate 103, and simultaneously realize the compression of the resistance welding plate 103 with the positive electrode 101 and the negative electrode 102.

[0028] In the present scheme, the welding device is suitable for the welding scene based on the principle of resistance welding. Resistance welding uses resistance heat as energy, utilizes the resistance heat generated by the current passing through the welding piece and the contact to locally heat the welding piece to a molten or plastic state, and then forms a firm joint under the action of pressure;

[0029] When the electrode is in close contact with the resistance welding plate, the current flows from the electrode to the resistance welding plate. Since the resistance welding plate itself has a certain resistance, according to Joule's law, heat will be generated when the current passes through these resistances;

[0030] The generated heat rapidly raises the temperature of the welding part of the resistance welding plate, and when the melting point is reached, the metal at this part will start to melt, forming a liquid metal pool;

[0031] During the welding process, the electrode continuously exerts a certain pressure on the resistance welding plate, which enables the liquid metal at the welding site to better penetrate, diffuse and fuse with each other;

[0032] When the welding current stops, the liquid metal cools and crystallizes under the action of pressure, forming a firm welding joint, thereby connecting the welding pieces together.

[0033] For example, in this scheme, one end of the positive electrode 101 is designed as a connection end connected to the positive electrode of the welding power supply. The other end is a working end in contact with the resistance welding plate 103. The shape of the working end is customized according to the size and shape of the resistance welding plate 103, for example, designed as a flat surface to increase the contact area with the resistance welding plate 103 and ensure uniform distribution of current;

[0034] The structure of the negative electrode 102 is similar to that of the positive electrode 101. The connection end is connected to the negative electrode of the welding power supply, and the working end is also flat and arranged opposite to the working end of the positive electrode 101 on the same side of the resistance welding plate 103;

[0035] The cushion block is made of high-strength and high-temperature-resistant material, which has good insulation and pressure resistance. The shape of the cushion block is designed as a cuboid, and the size is adjusted according to the size of the resistance welding plate 103 to ensure stable support for the resistance welding plate 103;

[0036] The upper and lower surfaces of each cushion block are ground to ensure good contact between the resistance welding plate 103 and the placement platform.

[0037] For example, in this scheme, the resistance welding plate 103 to be welded is cleaned to remove impurities such as oil stains and oxides on the surface. Then the resistance welding plate 103 is placed on the cushion block and adjusted to the correct position;

[0038] Start the welding equipment, and the control system controls the positive electrode 101 and the negative electrode 102 to move towards the resistance welding plate 103 until they are in close contact with the resistance welding plate 103 and exert a predetermined electrode pressure;

[0039] The welding power supply is turned on, and the current flows from the positive electrode 101 through the resistance welding plate 103 to the negative electrode 102. The resistance welding plate 103 generates heat due to the heat effect of the current, causing the temperature to rise rapidly, and the welding point of the resistance welding plate 103 reaches a molten state;

[0040] When the preset welding time is reached, the welding power supply cuts off the current, and the positive electrode 101 and the negative electrode 102 maintain the pressure for a period of time, allowing the welding site of the resistance welding plate 103 to cool and solidify under pressure.

[0041] The embodiment provides a welding device, which comprises a positive electrode, a negative electrode and a pad, wherein the positive electrode and the negative electrode are arranged on the same side of a resistance welding plate, and current passes through the resistance welding plate to generate heat. The layout changes the current direction in traditional welding, thereby avoiding a gap between the electrode plate and the negative electrode pad caused by uneven current distribution. In the traditional mode, the current direction may cause the electrode plate anode substrate to bear uneven pressure and thermal stress, and the gap is easily caused by bending deformation, and an electric arc is easily generated to damage the nickel layer on the surface of the electrode plate. The current path is optimized in the scheme, the risk of electric arc caused by the gap is reduced from the root, the possibility of damage to the nickel layer on the surface of the electrode plate is greatly reduced, the service life of the electrode plate is prolonged, and the equipment maintenance cost is reduced.

[0042] The pad is arranged on the other side of the resistance welding plate and cooperates with the positive electrode and the negative electrode to compress the resistance welding plate. The structure design enhances the stability of the whole welding device, and further avoids the gap caused by loosening or displacement of parts. The stable structure makes the current conduction more stable, reduces the current fluctuation caused by unstable structure, thereby effectively preventing the damage of the electric arc to the nickel layer on the surface of the electrode plate, and ensures the reliability and continuity of the welding process.

[0043] Unlike the traditional single-point welding mode, the scheme realizes two-point simultaneous welding. In the traditional welding, only one welding point can be welded each time, and multiple repeated operations are needed to complete the welding task of multiple welding points, which takes a long time. The device can simultaneously weld two welding points through reasonable arrangement of the positive electrode, the negative electrode and the resistance welding plate.

[0044] Two-point simultaneous welding reduces the waiting time and idle time of the equipment in the welding process. In the traditional welding mode, the welding equipment needs to be moved to the position of the next welding point after completing a welding point, which takes a certain amount of time. The scheme simultaneously welds two welding points, reduces the number of equipment movement and positioning, shortens the whole welding cycle, enables more welding tasks to be completed in unit time, and improves the overall output efficiency of the production line.

[0045] In Figure 1 On the basis of the scheme shown in the figure, in an implementable scheme, the welding device further comprises a discharge transformer and a busbar, the positive electrode is connected with the positive electrode of the discharge transformer through the busbar, and the negative electrode is connected with the negative electrode of the discharge transformer through the busbar.

[0046] For example, in the scheme, the busbar is a copper busbar with good conductivity, and the thickness of the busbar is determined according to the size of the current required to be borne by the welding device.

[0047] The discharge transformer is placed at a suitable position near the welding device to ensure its stability and good heat dissipation condition, and a high-temperature-resistant and high-current cable is used to connect the busbar and the discharge transformer.

[0048] The positive electrode is connected to the positive pole of the discharge transformer through the busbar, and the negative electrode is connected to the negative pole of the discharge transformer through the busbar. During the connection process, the joint of the cable is ensured to be well sealed to prevent moisture and impurities from entering and affecting the electrical performance.

[0049] For example, two mutually independent installation grooves are opened on the busbar by mechanical processing. The depth and width of the grooves are accurately designed according to the size of the electrode to ensure that the electrode can be tightly embedded.

[0050] Meanwhile, an insulating isolation protrusion with a height of about 5-10 mm and a width of about 3-5 mm is arranged between the two installation grooves. The protrusion is made of high-strength insulating material such as ceramic or high-strength insulating plastic to prevent electrical connection between the positive and negative electrodes.

[0051] Before the positive and negative electrodes are installed on the busbar, a layer of insulating rubber pad with a thickness of about 0.5-1 mm is wrapped around the bottom surface and side surface of the electrodes that contact the busbar. The rubber pad needs to have good flexibility and insulation performance to ensure electrical isolation between the electrode and the busbar, and also to play a sealing and buffering role when tightening the bolt to prevent the electrode from loosening due to vibration.

[0052] The positive electrode is embedded in the corresponding installation groove on the busbar and fixed using a matching bolt and nut. During the tightening process of the bolt, the positive electrode is ensured to be tightly attached to the busbar, and the insulating rubber pad will not be damaged due to excessive compression.

[0053] The negative electrode is installed in the same way to ensure reliable insulation isolation between the positive and negative electrodes through the insulating isolation protrusion and the insulating rubber pad.

[0054] To further ensure the insulation effect, after the installation of the positive and negative electrodes, a layer of insulating sealant is applied to the edge of the insulating isolation protrusion that contacts the electrode. The sealant not only fills the possible small gaps to prevent dust, moisture and other impurities from entering and affecting the insulation performance, but also enhances the stability of the insulation isolation.

[0055] Based on the foregoing welding device which further includes a discharge transformer and a busbar, in an implementable scheme, one negative electrode is connected to the busbar through two cables.

[0056] For example, in this scheme, parallel (negative) interfaces are arranged in the connection area of the busbar corresponding to the negative electrode. The two interfaces need to maintain a certain distance to ensure that the two cables do not interfere with each other after connection.

[0057] The shape and size of the interface are customized according to the specifications of the cable connector, for example, a round jack design is adopted, and the inner diameter of the jack is slightly larger than the outer diameter of the cable connector by 0.5-1 mm, facilitating the insertion and fixation of the cable connector;

[0058] Select a cable connector that matches the busbar interface and install it at one end of each cable. The cable connector is made of copper material and the surface is silver plated to reduce the contact resistance;

[0059] Insert the connectors of the two treated cables into the corresponding two interfaces on the busbar respectively. To ensure the stability of the connection, spring sheets or elastic ring structures can be provided inside the interface.

[0060] For example, in this scheme, according to the size of the current required to be carried by the welding device, the length of the cable and the allowable voltage drop and other factors, the appropriate size of the cable is selected;

[0061] The cable needs to have good electrical conductivity, high temperature resistance and flexibility. Good electrical conductivity can ensure minimal energy loss during current transmission; high temperature resistance ensures that the cable will not be damaged due to heat generated by current during welding; flexibility facilitates the installation and wiring of the cable.

[0062] In this scheme, the current needs to flow stably between the positive electrode and the negative electrode of the transformer. Using two cables can share the current, avoiding the situation that a single cable may overheat or even be damaged due to carrying too much current.

[0063] Based on the scheme in which the welding device further comprises a discharge transformer and a busbar, in an implementable scheme, the busbar is provided with an insulating layer, and the cable connected to the negative electrode is fixed to the insulating layer.

[0064] In this scheme, the negative electrode is arranged on the insulating layer on the busbar, achieving isolation between the positive electrode and the negative electrode.

[0065] For example, in this scheme, high-performance insulating materials such as polyimide film or epoxy glass fiber plate can be used as the insulating layer of the busbar.

[0066] For the polyimide film insulating layer, first cut the film into a size slightly larger than the busbar to ensure that it can completely cover the busbar. When installing, heat the film to a certain temperature (usually 200-300°C) and then tightly attach it to the surface of the busbar by rollers. Ensure that there are no bubbles and wrinkles between the film and the busbar, so that the insulating layer is tightly attached, avoiding local discharge during use;

[0067] If the epoxy glass fiber plate is used as the insulation layer, it can be fixed on the busbar by bolts. The holes matching the diameter of the bolts are pre-drilled on the busbar and the insulation layer, and the epoxy glass fiber plate is installed on the busbar by using the insulated bolts. At the contact position of the bolt and the busbar and the insulation layer, the insulating gasket is used to prevent the bolt from conducting current and ensure the insulation effect.

[0068] For example, in this scheme, a cable fixing seat can be arranged on the insulation layer, and the fixing seat can be made of insulating plastic (such as ABS engineering plastic). According to the diameter and layout of the cable, the fixing seat is designed to be a suitable shape, such as a U-shaped or ring-shaped structure, to ensure that the cable can be firmly fixed.

[0069] When fixing the negative electrode, two cables connected to the negative electrode are arranged along the surface of the insulation layer, and pass through the cable fixing seat. At the contact position of the cable and the fixing seat, the cable is fixed by using an insulating strap or clamp.

[0070] On the basis of any of the foregoing schemes, in an implementable scheme, the cushion block is made of glass fiber or racing steel.

[0071] For example, in this scheme, high-strength glass fiber reinforced plastic (glass fiber) is selected as the material of the cushion block. The glass fiber cushion block has excellent insulation performance and can effectively prevent current leakage, ensuring electrical safety during welding.

[0072] In addition, the glass fiber cushion block has high mechanical strength, and its tensile strength can reach 300-500 MPa, which can withstand a large pressure and is not easy to deform, thereby ensuring the stable support of the resistance welding plate and the workpiece during welding.

[0073] Racing steel (polyformaldehyde) has good comprehensive performance. It has good rigidity and high hardness, and its Rockwell hardness can reach 80-90HRR, which can provide stable support force for the resistance welding plate and the workpiece.

[0074] The racing steel has excellent wear resistance, and the wear amount is very small under the condition of long-term pressure and friction, which can effectively prolong the service life of the cushion block.

[0075] On the basis of any of the foregoing schemes, in an implementable scheme, the resistance welding plate is made of a nickel foam plate.

[0076] For example, in this scheme, the resistance welding plate is made of a nickel foam plate. The nickel foam plate has high resistance, and its resistivity can meet the demand of heat generation of resistance welding within a certain range.

[0077] The nickel foam plate is light in quality, which is more convenient during equipment installation and operation, and can adapt to the welding demand of workpieces of different shapes to a certain extent.

[0078] In an exemplary embodiment, the position and shape of the electrode are adjusted to make full contact with the nickel foam plate before welding. A flat electrode or a specially shaped electrode according to the shape of the nickel foam plate can be used. During the welding process, the electrode pressure is adjusted to ensure that the current can smoothly pass through the nickel foam plate.

[0079] On the basis of any of the preceding solutions, in an implementable solution, the welding current between the positive electrode and the negative electrode is 2.4 KA.

[0080] In an exemplary embodiment, the current can be set to 2.4 KA through the control system of the discharge transformer.

[0081] Before welding, a high-precision current sensor can be used to monitor and calibrate the output current in real time. During calibration, if a deviation is found between the actual output current and the set value, the control system can be adjusted through the fine-tuning function.

[0082] On the basis of any of the preceding solutions, in an implementable solution, the positive electrode and the negative electrode are also provided with a pressing mechanism for applying a pressing force to the resistance welding plate during resistance welding.

[0083] In an exemplary embodiment, the pressing mechanism can use a point-by-point pressing mechanism, and the electric pressing mechanism can use a motor-driven screw or a gear-and-rack mechanism to realize the movement and pressing of the electrode. The size of the pressing force and the movement speed of the electrode can be accurately set through the controller of the motor.

[0084] In an exemplary embodiment, the pressing mechanism and the positive and negative electrodes can be designed as a whole, and through this integrated installation method, the number of transmission links can be reduced, and the response speed and stability of the pressing mechanism can be improved.

[0085] In an exemplary embodiment, the size of the pressing force is reasonably set according to the material and thickness of the resistance welding plate and the welding process requirements. When setting the pressing force, the elastic deformation of the nickel foam plate and the thermal expansion of the workpiece should be considered to ensure that the electrode and the resistance welding plate maintain good contact during the welding process and that the nickel foam plate is not damaged or the workpiece is not deformed due to excessive pressure.

[0086] In addition, in order to improve the welding efficiency and quality, the pressure rising and falling speed of the pressing mechanism should be reasonably set. The pressure rising speed should not be too fast to avoid impacting the resistance welding plate and the workpiece, and the pressure falling speed should not be too fast to prevent defects from occurring at the welded part due to external force when it is not completely cooled and solidified.

[0087] On the basis of any of the preceding solutions, in an implementable solution, the negative electrode is made of tungsten steel.

[0088] Exemplarily, in the present solution, the negative electrode is made of tungsten steel, which has an extremely high melting point of up to 3422℃, so that the negative electrode is not easy to melt or deform when bearing high heat generated in the welding process;

[0089] In the case of using a nickel foam plate as the resistance welding plate and a welding current of 2.4KA, the temperature of the welding area will rise rapidly. The tungsten steel negative electrode can work stably due to its excellent high-temperature resistance, thereby ensuring the continuity and stability of the welding process.

[0090] The hardness of tungsten steel is extremely high, and its Rockwell hardness can reach 90-95HRA. In the welding process, the negative electrode frequently contacts and rubs against the resistance welding plate and the workpiece, and the high-hardness tungsten steel can effectively resist wear and tear, thereby prolonging the service life of the electrode.

[0091] On the basis of any of the preceding solutions, in an implementable solution, the welding device comprises a positive electrode, a negative electrode, a cushion block, a discharge transformer, and a bus bar.

[0092] The positive electrode and the negative electrode are provided with a pressing mechanism, the bus bar is provided with an insulating layer, the cushion block is made of glass fiber or stainless steel, the resistance welding plate is made of a nickel foam plate, and the negative electrode is made of tungsten steel.

[0093] The positive electrode and the negative electrode are arranged on the same side of the resistance welding plate, and the cushion block is arranged on the other side of the resistance welding plate opposite to the positive electrode and the negative electrode.

[0094] The positive electrode is connected to the positive pole of the discharge transformer through the bus bar, the negative electrode is connected to the insulating layer, and the negative electrode is connected to the negative pole of the discharge transformer through the insulating layer.

[0095] In the present solution, two welding points are formed at the positive electrode and the negative electrode during welding.

[0096] Exemplarily, in the prior art, the anode substrate of the electrode plate is only about 0.6mm, and the flatness cannot completely reach flatness. When welding a certain welding point on the nickel foam plate, the negative electrode block is separated from the anode substrate to form a gap, which causes arc discharge phenomenon, resulting in arc injury marks on the anode substrate.

[0097] The arc injury has color display within 30s in the porosity test, and is determined as unqualified test, which affects the later charge-discharge efficiency. Moreover, the nickel foam plate can only be welded one by one, and the welding efficiency is low.

[0098] During welding, the current direction flows into the negative electrode block after passing through the positive electrode head and the electrode plate body to form a loop. When welding one of the welding points, the remaining welding points are raised after the cylinder is pressed down, and a gap is generated between the negative electrode block and the electrode plate, thereby causing arc injury and making the electrode plate fail in the porosity test.

[0099] The welding current of the nickel foam welding is between 2.4 KA and 3.8 KA, only one welding point can be welded each time, the risk of damaging the nickel layer of the electrode plate is high, and the efficiency is low.

[0100] In the scheme, the welding device is provided with a cushion block, and an insulating material such as glass fiber or stainless steel is used as support, and the negative electrode is connected with the negative electrode of the discharge transformer by cable (two cables are needed for each electrode), and an insulating plate is added below the positive bus plate of the discharge transformer for fixing the negative electrode cable;

[0101] During the welding process, the current forms a loop on the electrode plate on the nickel foam side of the electrode plate, and the air cylinder keeps the negative electrode block and the electrode plate without gap, avoiding the phenomenon of electric arc injury.

[0102] In the scheme, the current direction during welding can prevent the gap between the electrode plate and the negative electrode block during welding from causing arc damage to the nickel layer on the surface of the electrode plate;

[0103] The negative electrode block is replaced from tungsten steel to stainless steel, which can better protect the nickel layer on the surface of the electrode plate;

[0104] The welding efficiency is optimized from single-point welding to two-point welding, which improves the production efficiency and reduces the welding current to 2.4 KA, reducing the risk of damage to the nickel layer on the surface of the electrode plate.

[0105] In the scheme, the welding device is powered by a welding power supply, and its output characteristics need to meet the requirements of nickel foam plate welding, usually with constant current, constant voltage or constant power output characteristics, and can output direct current or alternating current. Direct current power supply has stable output and fast response speed, suitable for high-precision welding; alternating current power supply has low cost, suitable for mass production.

[0106] The discharge transformer is used to convert the voltage and current output by the welding power supply into a high-current and low-voltage form suitable for nickel foam plate welding, to generate enough heat at the welding site;

[0107] In the scheme, the welding device is also provided with a rack, which is the supporting structure of the entire welding equipment, to ensure that the equipment does not deform and vibrate during the welding process, affecting the welding quality;

[0108] The pressing mechanism is used to apply a certain pressure to the nickel foam plate, so that the electrode and the nickel foam plate are in close contact, and the stable pressure is maintained during the welding process;

[0109] The welding device can also include a clamping mechanism, which is used to clamp and fix the nickel foam plate before welding, to ensure that the nickel foam plate does not move or shake during the welding process, and to ensure the accuracy of the welding position;

[0110] The welding device further comprises a controller, a sensor and a control circuit. The controller is the core of the control part, which can be a single-chip microcomputer, a PLC or an industrial computer, etc., and can accurately control the welding process according to the preset welding parameters and programs;

[0111] The sensor is used for monitoring the key parameters such as welding current, voltage, electrode pressure and welding time in real time, and feeding the monitored signals to the controller;

[0112] The control circuit adjusts and controls the welding power supply and the electrode pressure mechanism according to the instructions of the controller and the feedback signals of the sensor, so as to realize the automation and intelligentization of the welding process.

[0113] For example, in this scheme, the nickel foam plate is placed between the electrode and the cushion block during welding, and the electrode pressure mechanism applies a certain pressure to the nickel foam plate, so that the electrode and the nickel foam plate are in close contact, and the current can pass smoothly;

[0114] After the welding power supply is turned on, the current passes through the electrode and the nickel foam plate after being stepped down and converted by the welding transformer. In a short time, the temperature of the welding part rises rapidly, and when the melting point of nickel is reached, the welding part of the nickel foam plate begins to melt, forming a liquid metal pool;

[0115] During the power-on process, the electrode continues to apply pressure to the nickel foam plate, so that the liquid metal pool remains stable under the action of the pressure;

[0116] After the welding current is disconnected, the electrode pressure continues to be maintained for a period of time, so that the liquid metal pool cools and crystallizes under the action of the pressure, forming a firm welding joint.

[0117] Note that the above is only a preferred embodiment of the present application and the technical principle applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A welding apparatus, characterized in that, include: Positive electrode, negative electrode, and pad; The positive electrode and the negative electrode are disposed on the same side of the resistance welding plate, and the pad is disposed on the opposite side of the resistance welding plate to the positive electrode and the negative electrode. The resistance welding plate is used to generate heat when current passes between the positive electrode and the negative electrode to weld the solder joints on the resistance welding plate. The pad is used to support the resistance welding plate and, together with the positive and negative electrodes, to press the resistance welding plate together.

2. The welding apparatus as described in claim 1, characterized in that, It also includes a discharge transformer and a busbar, wherein the positive electrode is connected to the positive terminal of the discharge transformer through the busbar, and the negative electrode is connected to the negative terminal of the discharge transformer through the busbar.

3. The welding apparatus as described in claim 2, characterized in that, One of the negative electrodes is connected to the busbar via two cables.

4. The welding apparatus as described in claim 2, characterized in that, The busbar is provided with an insulating layer, and the cable connecting the negative electrode to the busbar is fixed to the insulating layer.

5. The welding apparatus as described in claim 1, characterized in that, The pad is made of fiberglass or acetal alloy.

6. The welding apparatus as described in claim 1, characterized in that, The resistance welding plate is made of nickel foam board.

7. The welding apparatus as described in claim 1, characterized in that, The welding current between the positive electrode and the negative electrode is 2.4 kA.

8. The welding apparatus as claimed in claim 1, characterized in that, The positive and negative electrodes are also equipped with a clamping mechanism, which applies a clamping force to the resistance welding plate when welding the resistance welding plate.

9. The welding apparatus as claimed in claim 1, characterized in that, During welding, two weld points are formed at the pair of positive electrodes and the pair of negative electrodes.

10. The welding apparatus as claimed in claim 1, characterized in that, The negative electrode is made of tungsten steel.

Images