A dissimilar metal induction heating - electromagnetic pulse composite welding device and method

Abstract

The present invention discloses a dissimilar metal induction heating - electromagnetic pulse composite welding device and method. The method uses an induction coil to heat a metal workpiece, forming a molten semi - solid micro - region at the dissimilar metal interface to reduce the yield strength of the material, and then loading an electromagnetic pulse to the welding position through a composite welding head, impacting the interface with a high - frequency and small electromagnetic force to break the interface oxide film and promote the formation of IMCs. During the welding process, the induction heating temperature, the magnitude of the electromagnetic force, and the impact frequency are regulated to precisely control the growth of the IMCs layer at the interface. The device includes an induction heating power supply, an excitation power supply, a control box, and an induction heating - electromagnetic pulse composite welding head. The composite welding head integrates a capacitor, a Z - axis telescopic rod, a welding block with an electromagnetic coil, an induction heating coil, and a temperature measuring instrument. The present invention gives full play to the advantages of induction heating and electromagnetic pulse, and can effectively solve the problems such as large electromagnetic force required in traditional electromagnetic pulse welding, high welding energy consumption, and difficult interface regulation.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding, and more specifically, relates to a dissimilar metal induction heating - electromagnetic pulse composite welding device and method. Background Art

[0002] The dissimilar metal composite structure comprehensively utilizes the performance advantages of different materials, can fully meet the development needs of structural lightweight and functional integration, and is one of the important means to achieve carbon peak and carbon neutrality. However, due to the easy formation of a large number of brittle intermetallic compounds (IMCs) at the joint interface of the dissimilar metal structure, the welding of common dissimilar metals (such as Al - Ti, Al - Mg, Fe - Ti, etc.) is quite difficult, which severely restricts the application and development of the dissimilar metal composite structure.

[0003] Existing dissimilar metal welding methods all have limitations. For example, fusion welding has simple procedures and high efficiency, but the high temperature at the joint interface makes the IMCs react rapidly, resulting in problems such as poor interface controllability, narrow process window, and unstable weld quality; solid - phase welding mainly based on diffusion welding can control the growth of brittle IMCs at the interface, and the weld quality is good, but it has a long temperature control time, low efficiency, and harsh environmental requirements, so this method cannot be used in most industrial environments.

[0004] Relatively speaking, electromagnetic pulse welding induces plastic deformation of materials through high - strength electromagnetic force to form an effective connection. The entire welding process does not involve heating, maintaining the inherent properties of the materials, and at the same time combining the advantages of high - quality diffusion welding and high - efficiency fusion welding. However, traditional electromagnetic pulse welding usually uses an electromagnetic force more than 10 times the yield strength of the material to form an instantaneous reaction to inhibit the growth of IMCs. Therefore, it must be equipped with a large - capacity energy storage device to quickly release a large electromagnetic force, resulting in excessive welding energy consumption. On the other hand, after severe plastic deformation at the metal material interface, a large amount of residual stress will accumulate, affecting the bonding performance of the weld. Summary of the Invention

[0005] Aiming at the defects and improvement requirements of the existing technology, the present invention provides a dissimilar metal induction heating - electromagnetic pulse composite welding device and method. This method combines induction heating and electromagnetic pulse and applies them jointly to the welding process. An induced current is formed in the metal by an induction coil to heat the workpiece, reducing the yield strength of the metal material under the action of high temperature, and then a small electromagnetic pulse can induce sufficient plastic deformation, thereby realizing an effective connection in the solid - phase state at the welding interface. This composite welding method can effectively solve the problems of excessive electromagnetic force required for current electromagnetic pulse welding, high welding energy consumption, serious accumulation of weld residual stress, and difficult precise control of the IMCs layer at the interface.

[0006] To achieve the above object, the present invention provides a dissimilar metal induction heating - electromagnetic pulse composite welding device, comprising: an exciting power supply, an induction heating power supply, a control box, and a composite welding head; the composite welding head includes a capacitor, a Z-axis telescopic rod, a welding block with an electromagnetic coil, an induction heating coil, and a temperature measuring instrument; wherein, the capacitor is used to store the electric energy required for the release of electromagnetic pulses; the upper end of the Z-axis telescopic rod is connected to the capacitor, and the lower end is connected to the welding block; the electromagnetic coil is connected to the capacitor; the temperature measuring instrument is fixed on the side of the induction heating coil; the exciting power supply is used to supply power to the capacitor and the Z-axis telescopic rod; the induction heating power supply is used to supply power to the induction heating coil and the temperature measuring instrument; the control box is used to control the switches of the exciting power supply and the induction heating power supply, the temperature feedback of the temperature measuring instrument, and the setting of welding parameters during the welding process.

[0007] Further, the control box is connected to the induction heating power supply, the exciting power supply, and the composite welding head through wired electrical signals, and the panel on the control box can input welding parameters or control programs.

[0008] Further, the Z-axis telescopic rod is controlled by electric, pneumatic, or hydraulic multi-stage telescoping, and can drive the welding block to move up and down in a limited range in the Z-axis direction by jogging or steplessly.

[0009] Further, the composite welding head further includes a magnetic flux concentrator coaxially sleeved outside the induction heating coil.

[0010] Further, the induction heating coil is coaxially arranged below the welding block or is fixed beside the welding block by a fixed connecting rod beside the axis.

[0011] Further, the composite welding head is fixed on a three-dimensional five-axis numerical control machine tool or a six-axis robot arm and moves along the welding trajectory.

[0012] The present invention also provides a dissimilar metal induction heating - electromagnetic pulse composite welding method, which is applied to the above composite welding device, and includes: fitting and fixing two dissimilar metal workpieces to be welded according to the joint type; setting the induction heating temperature, as well as the intensity, frequency, and pulse width of the electromagnetic pulse, in the panel of the control box; turning on the induction heating power supply to make the induction heating coil work, and after the set temperature is measured by the temperature measuring instrument, then turning on the exciting power supply to charge the capacitor; according to the process parameters preset in the control box, making the capacitor quickly release electric energy to the electromagnetic coil, and the instantaneously released electromagnetic force drives the welding block to impact the workpiece to be welded at high speed; the workpiece to be welded undergoes plastic deformation under the action of multiple high-frequency electromagnetic impacts, realizing effective connection.

[0013] Furthermore, the induction heating temperature is 100°C - 2000°C, the electromagnetic pulse intensity is 0.01T - 200T, the electromagnetic pulse frequency is 10Hz - 1000Hz, and the electromagnetic pulse width is 10ns - 100s; the distance between the composite welding head and the surface of the workpiece to be welded is 0.1mm - 100mm.

[0014] Furthermore, the induction heating temperature is optimized to 100°C - 1200°C, the electromagnetic pulse intensity is optimized to 0.1T - 100T, the electromagnetic pulse frequency is optimized to 10Hz - 500Hz, and the electromagnetic pulse width is optimized to 1μs - 10s; the distance between the composite welding head and the surface of the workpiece to be welded is optimized to 0.5mm - 50mm.

[0015] Furthermore, the two dissimilar metal workpieces to be welded include but are not limited to any one of aluminum - steel, aluminum - magnesium, magnesium - steel, steel - titanium, steel - copper, and aluminum - copper.

[0016] Generally speaking, through the above technical solutions conceived by the present invention, the following beneficial effects can be achieved:

[0017] (1) The present invention breaks through the technical bottleneck that traditional electromagnetic pulse welding must adopt a large electromagnetic force. By induction heating to reduce the yield strength of the metal material, a semi - solid micro - region is formed at the bonding interface, and then a small electromagnetic pressure high - frequency impact can induce sufficient plastic deformation to achieve the welding of dissimilar metal composite structures.

[0018] (2) The present invention realizes the phased and precise regulation of the IMCs layer at the dissimilar metal interface. Through the thermo - mechanical coupling effect of induction heating and electromagnetic pulses, the oxide film at the interface is broken, promoting the formation of IMCs. At the same time, by reducing the induction heating temperature, the stable diffusion of metal atoms is achieved, controlling the growth rate of IMCs, and realizing the formation of a high - quality welding interface.

[0019] (3) Starting from the formation and action mechanism of the electromagnetic pulse force, the present invention regulates the IMCs generation stage into a fusion brazing mode and the growth stage into a diffusion welding mode, thereby improving the welding quality to the diffusion welding level and the efficiency to the second - level close to fusion welding, truly realizing the balanced regulation of quality - efficiency.

[0020] (4) The present invention has a wide range of applications. It is not only applicable to material combinations with large melting point differences such as Al - Fe, Al - Ti, Al - Cu, and Mg - Ti, but also can realize material combinations with small melting point differences such as Al - Mg and Fe - Ti by adding a high - melting - point intermediate layer. Without modifying the equipment, it has good expandable performance. Brief Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the dissimilar metal induction heating - electromagnetic pulse composite welding equipment provided by the present invention.

[0022] Figure 2 Schematic diagram of coaxial different-side and side-axis combination of the induction heating coil provided by the present invention.

[0023] Figure 3 Schematic diagram of lap spot welding of Al / Mg dissimilar metals provided in the first embodiment of the present invention.

[0024] Figure 4 Schematic diagram of point-by-point seam welding of Al / Ti dissimilar metals provided in the second embodiment of the present invention.

[0025] Figure 5 Schematic diagram of continuous welding of Al / Fe dissimilar metals provided in the third embodiment of the present invention.

[0026] In all the drawings, the reference numerals respectively represent: 1 - excitation power supply; 2 - induction heating power supply; 3 - control box; 4 - composite welding head; 5 - capacitor; 6 - Z-axis telescopic rod; 7 - connecting component; 8 - welding block; 9 - electromagnetic coil; 10 - induction heating coil; 11 - thermometer; 12 - first metal to be welded; 13 - second metal to be welded; 14 - fixing fixture; 15 - back cushion plate; 16 - processing table; 17 - fixing connecting rod; 18 - 5-series aluminum alloy plate; 19 - stainless steel intermediate foil layer; 20 - AZ31 magnesium alloy plate; 21 - welding spot; 22 - MgFe intermetallic compound layer; 23 - AlFe intermetallic compound layer; 24 - titanium alloy plate; 25 - 2-series aluminum alloy plate; 26 - AlTi intermetallic compound layer; 27 - 304 stainless steel plate; 28 - continuous weld bead; 29 - AlFe intermetallic compound layer. Specific embodiments

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] In the present invention, terms such as "first", "second", etc. (if any) in the present invention and the drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence.

[0029] The present invention organically combines induction heating and electromagnetic pulse. Its principle is to heat the workpiece by forming eddy currents in the metal through electromagnetic induction, and the yield strength of the material will gradually decrease as the temperature rises. At this time, a small electromagnetic force can be used to induce a sufficiently large plastic deformation, which can effectively solve the problems of large current required electromagnetic force, high welding energy consumption and difficult interface regulation, making it possible to accurately control the generation and growth process of the IMCs interface in stages.

[0030] Specifically, the core idea of dissimilar metal induction heating - electromagnetic pulse composite welding is as follows: during the formation stage of IMCs, induction heating is used to form a semi - solid micro - region between the interfaces of dissimilar materials, and then the oxide film is broken by the combined action of high - temperature heat and electromagnetic force, making it disperse in the molten micro - region; during the growth stage of IMCs, the interface temperature is reduced below the eutectic reaction temperature, and then small electromagnetic force impacts are applied multiple times to induce plastic deformation to regulate the atomic diffusion behavior, so as to achieve the purpose of efficient and controllable growth of the IMCs interface.

[0031] Based on the above principles and ideas, the present invention provides a dissimilar metal induction heating - electromagnetic pulse composite welding device, as Figure 1 shown. The welding device mainly includes: an excitation power supply 1, which provides electrical energy for the generation of electromagnetic pulses; an induction heating power supply 2, which provides electrical energy for the induction heating coil; a control box 3, which serves as the central control device for the welding process and can input welding parameters and welding programs on the panel; a composite welding head 4, which is mainly composed of a capacitor 5, a Z - axis telescopic rod 6, a connecting component 7, a welding block 8 with an electromagnetic coil 9, an induction heating coil 10, and a temperature measuring instrument 11. Preferably, the capacitor 5 uses a high - energy capacitor, and the temperature measuring instrument 11 uses an infrared temperature measuring instrument. Among them, the induction heating coil 10 realizes non - contact heating by forming an induction eddy current in the metal workpiece, and the temperature measuring instrument 11 measures the temperature of the metal workpiece surface non - contact through an infrared temperature sensor; the capacitor 5 is repeatedly charged and discharged according to a preset value, and the electrical energy instantaneously released passes through the electromagnetic coil 9, converting the electrical energy into a powerful electromagnetic force, driving the welding block 8 to impact the surface of the workpiece to be welded at high speed.

[0032] An external fixed magnetic flux concentrator can be coaxially sleeved outside the induction heating coil 10 in the composite welding head 4 described in the present invention, which can be used to increase the magnetic flux, contract the magnetic force lines, focus the magnetic field, improve the energy density and the induction heating accuracy, and achieve micro - region selective rapid and precise heating.

[0033] The composite welding head 4 described in the present invention is installed on a numerical control machine tool or a welding robot. By controlling the numerical control machine tool or the welding robot to move along the welding trajectory, the welding process is completed. It can also fix the composite welding head 4 and realize welding by moving the workpiece to be welded.

[0034] The induction heating - electromagnetic pulse composite welding device described in the present invention can be used in combination or independently. The induction heating device can be used for pre - welding preheating or post - welding stress relief. When used for pre - welding preheating, the workpiece to be welded is heated to a predetermined temperature by the induction heating coil and then the heating is stopped, and then electromagnetic pulse welding is carried out; when used for post - welding stress relief, after electromagnetic pulse welding is completed, the induction heating coil is started for stress relief annealing, which can effectively release the residual stress at the interface, far superior to the time - consuming and laborious stress relief methods such as traditional mechanical hammering, ultrasonic vibration or aging treatment.

[0035] Further, the above-mentioned dissimilar metal induction heating - electromagnetic pulse composite welding equipment is used for dissimilar metal welding, and the welding method includes the following steps:

[0036] First step, surface cleaning of the dissimilar metal composite structure before welding and fixture fixing. Use organic solvents such as acetone to clean the surface of the workpiece to be welded. After completely cleaning the surface of the metal material, then use a fixture to fix the workpiece according to the required joint type.

[0037] Second step, setting of process parameters during welding. Install and debug the induction heating - electromagnetic pulse composite welding equipment, and preset process parameters such as induction heating temperature, electromagnetic pulse intensity and frequency on the control panel of the control box. Among them, the induction heating temperature is 100°C - 2000°C, and the more optimized range is 100°C - 1200°C; the electromagnetic pulse intensity is 0.01T - 200T, and the more optimized range is 0.1T - 100T; the electromagnetic pulse frequency is 10Hz - 1000Hz, and the more optimized range is 10Hz - 500Hz; the electromagnetic pulse pulse width is 10ns - 100s, and the more optimized range is 1μs - 10s.

[0038] Third step, start the induction heating - electromagnetic pulse composite welding process. Move the composite welding head to the starting position of the welding track to be welded, and adjust the Z-axis telescopic rod to control the distance between the composite welding head and the workpiece surface within 0.1mm - 100mm, and the more optimized range is 0.5mm - 50mm. First, start the induction heating power supply. After the temperature of the metal material reaches the set induction heating temperature, then turn on the excitation power supply to charge the capacitor. According to the process parameters preset in the control box, the capacitor quickly releases electrical energy to the electromagnetic coil, and the instantaneously released electromagnetic force drives the welding block to impact the workpiece to be welded at high speed; the workpiece to be welded undergoes plastic deformation under the action of multiple high-frequency electromagnetic impacts, realizing effective connection.

[0039] Further, in the third step, the welding track includes but is not limited to spot welding, stitch welding and continuous welding. When used for lap spot welding, move the composite welding head to the position to be welded through the control system, adjust the distance between the welding head and the workpiece surface and set the process parameters. First, start the induction heating device. When the heating temperature reaches the set value, then start the electromagnetic pulse device, thus forming a spot welding joint; when used for stitch welding, the welding process is the same as the spot welding process, but after a weld spot is formed, the welding process pauses, and the composite welding head is moved to another position of the welding track through the motion device, and the welding process is started again. The distance between the formed weld spots is fixed, and the weld spots are connected point by point to form a weld seam, thus realizing stitch welding; when used for continuous welding, the welding process is the same as spot welding, but during the welding process, the motion device gradually moves along the welding track, and the welding process is continuous without interruption, and the weld spots are connected and overlapped to form a continuous weld seam.

[0040] Under normal circumstances, most metal materials will form induced eddy currents under an induction heating coil, thereby achieving non-contact induction heating. For the composite welding of these dissimilar metals, no intermediate interlayer is required. For metal materials that cannot form induced eddy currents, another metal interlayer that can form induced eddy currents is added in the middle to form induced eddy currents for heating.

[0041] According to the actual usage, such as Figure 2 As shown, the induction heating coil in the induction heating - electromagnetic pulse composite welding equipment of the present invention can also be placed on the lower side of the metal workpiece, coaxial with the welding block with an electromagnetic coil; or the induction heating coil is fixed beside the welding block with an electromagnetic coil by using the fixed connecting rod 17. The side composite structure is suitable for metal materials that need preheating before welding or post-welding preheating, and is more conducive to eliminating the residual stress generated by the electromagnetic impact after welding.

[0042] The following combines specific implementation cases to further illustrate the beneficial effects of the induction heating - electromagnetic pulse composite heat source provided by the present invention for dissimilar metal welding.

[0043] Example 1

[0044] This example illustrates the present invention by taking the lap spot welding of two of the lightest Al - Mg low melting point dissimilar alloys as an example. As Figure 3 shown, the lap joint spot welding process test of Al - Mg is carried out. Since the melting points of aluminum and magnesium alloys are similar, and the growth rate of Al - Mg IMCs (Al3Mg2 and Al 12 Mg 17 ) is extremely fast, it is necessary to use an intermediate layer to avoid or reduce the direct contact of Al and Mg during welding. In this test, a 0.1 mm thick stainless steel foil is used as the intermediate layer, including but not limited to other high melting point materials such as Ti / Ni / Cu. The composite welding joint is moved 3 mm above the plate, the induction heating temperature is set at 450 °C, the electromagnetic pulse intensity is 10 T, the frequency is 50 Hz, and the pulse width is 500 ns. First, start the induction heating coil, and after a delay of 5 s, turn on the electromagnetic pulse coil, and complete the spot welding process under the action of high-frequency impact. After welding, a uniform thin layer of MgFe and AlFe intermetallic compounds is formed at the interface. The spot weld has a good macroscopic morphology, its tensile shear strength is 3 kN, and the dimensional deformation of the plate meets the requirements of the structural assembly accuracy.

[0045] Example 2

[0046] This example illustrates the present invention by taking the sequential seam welding of Al - Ti dissimilar alloys with a large melting point difference as an example. As Figure 4As shown, the Al-Ti lap-by-spot seam welding process test was carried out. The induction heating temperature was set at 500 °C, the electromagnetic pulse intensity was 25 T, the frequency was 60 Hz, and the pulse width was 200 ns. Different from Example 1, after welding a single solder joint, the composite welding head was horizontally moved 10 mm, and after a 10 s delay, the spot welding process was repeated until the lap-by-spot seam welding process was completed. The weld formed well without defects such as undercut, porosity, and cracks, and a 0.1 μm thin layer of AlTi intermetallic compound was formed at the joint interface. Its tensile shear strength was 2.5 kN per point, and the deformation of the sheet size met the requirements of the structural assembly accuracy.

[0047] Example 3

[0048] In this example, the present invention is described by taking the lap spot welding of dissimilar alloys with the largest melting point difference of Al-Fe in process applications as an example. As Figure 5 shown, the Al-Fe lap seam welding process test was carried out. Different from the spot welding process, during the welding process, the induction heating and electromagnetic pulse continuously acted on the material to form a continuous weld bead. The induction heating temperature was set at 500 °C, the electromagnetic pulse latency was 60 T, the frequency was 100 Hz, and the pulse width was 300 ns. After welding, the weld had no defects such as undercut, porosity, and cracks, and a 0.03 μm thin layer of AlFe intermetallic compound was formed at the interface. Its tensile shear strength was 20 kN, and the deformation of the sheet size met the requirements of the structural equipment accuracy.

[0049] In summary, the present invention heats the metal workpiece through an induction coil to form a molten semi-solid micro-region at the interface of dissimilar metals, reducing the yield strength of the material. Then, the electromagnetic pulse is loaded onto the welding position through the composite welding head, and the interface is impacted with a high-frequency small electromagnetic force to break the interface oxide film and promote the formation of IMCs. During the welding process, the induction heating temperature, the magnitude and frequency of the electromagnetic force are regulated, so as to accurately regulate the growth of the IMCs layer at the interface. This method fundamentally breaks through the technical bottleneck of dissimilar metal welding, can effectively solve the problems such as the excessive electromagnetic force required for current electromagnetic pulse welding, high welding energy consumption, serious accumulation of weld residual stress, and difficulty in accurately regulating the IMCs layer at the interface. It transforms the traditional one-time continuous welding process into a phased precise regulation, and can achieve a balanced regulation of welding efficiency and welding quality.

[0050] It is easy for those skilled in the art to understand that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dissimilar metal induction heating - electromagnetic pulse composite welding method, characterized in that, Including: Fix two dissimilar metal workpieces to be welded together according to the joint type; set the induction heating temperature, electromagnetic pulse intensity, frequency and pulse width on the panel of the control box (3); turn on the induction heating power supply (2) to make the induction heating coil (10) work. After reaching the set temperature measured by the thermometer (11), turn on the excitation power supply (1) to charge the capacitor (5); according to the process parameters preset in the control box (3), make the capacitor (5) quickly release electrical energy to the electromagnetic coil (9), and the instantaneously released electromagnetic force drives the welding block (8) to impact the workpiece to be welded at high speed; the workpiece to be welded undergoes plastic deformation under the action of multiple high-frequency electromagnetic impacts to achieve effective connection; Heat the metal workpiece through the induction heating coil to form a molten semi-solid micro-region at the interface of dissimilar metals, reducing the yield strength of the material. Then, load the electromagnetic pulse to the position to be welded through the composite welding joint, impact the interface with a high-frequency and small electromagnetic force to break the interface oxide film and promote the formation of IMCs, and regulate the induction heating temperature, electromagnetic force magnitude and frequency during the welding process, so as to accurately regulate the growth of the IMCs layer at the interface.

2. The composite welding method according to claim 1, characterized in that, The induction heating temperature is 100°C - 2000°C, the electromagnetic pulse intensity is 0.01T - 200T, the electromagnetic pulse frequency is 10Hz - 1000Hz, and the electromagnetic pulse width is 10ns - 100s; the distance between the composite welding joint and the surface of the workpiece to be welded is 0.1mm - 100mm.

3. The composite welding method according to claim 2, characterized in that, The induction heating temperature is 100°C - 1200°C, the electromagnetic pulse intensity is 0.1T - 100T, the electromagnetic pulse frequency is 10Hz - 500Hz, and the electromagnetic pulse width is 1μs - 10s; the distance between the composite welding joint and the surface of the workpiece to be welded is 0.5mm - 50mm.

4. The composite welding method according to claim 1, characterized in that, The two dissimilar metal workpieces to be welded include any one of aluminum-steel, aluminum-magnesium, magnesium-steel, steel-titanium, steel-copper, and aluminum-copper.

5. A dissimilar metal induction heating - electromagnetic pulse composite welding device for implementing the composite welding method according to any one of claims 1 - 4, characterized in that, Including: An excitation power supply (1), an induction heating power supply (2), a control box (3) and a composite welding joint (4); The composite welding joint (4) includes a capacitor (5), a Z-axis telescopic rod (6), a welding block (8) with an electromagnetic coil (9), an induction heating coil (10) and a thermometer (11); among them, the capacitor (5) is used to store the electrical energy required for electromagnetic pulse release; the upper end of the Z-axis telescopic rod (6) is connected to the capacitor (5), and the lower end is connected to the welding block (8); the electromagnetic coil (9) is connected to the capacitor (5); the thermometer (11) is fixed at the side end of the induction heating coil (10); The excitation power supply (1) is used to supply power to the capacitor (5) and the Z-axis telescopic rod (6); The induction heating power supply (2) is used to supply power to the induction heating coil (10) and the thermometer (11); The control box (3) is used to control the switches of the excitation power supply (1) and the induction heating power supply (2), the temperature feedback of the thermometer (11) and the setting of welding parameters during the welding process.

6. The dissimilar metal induction heating - electromagnetic pulse composite welding device according to claim 5, characterized in that, The control box (3) is connected to the induction heating power supply (2), the excitation power supply (1) and the composite welding joint (4) through wired electrical signals, and the panel on the control box (3) can input welding parameters or control programs.

7. The dissimilar metal induction heating - electromagnetic pulse composite welding device according to claim 5, characterized in that, The control box (3) is connected to the induction heating power supply (2), the excitation power supply (1), and the composite welding head (4) through wired electrical signals, and the panel on the control box (3) can input welding parameters or control programs.

8. The dissimilar metal induction heating - electromagnetic pulse composite welding device according to claim 5, characterized in that, The composite welding head further includes a magnetic flux concentrator coaxially sleeved outside the induction heating coil (10).

9. The dissimilar metal induction heating - electromagnetic pulse composite welding device according to claim 5, characterized in that, The induction heating coil (10) is coaxially arranged below the welding block (8) or is fixed beside the welding block (8) by a fixed connecting rod (17) in a side-axis manner.

10. The dissimilar metal induction heating - electromagnetic pulse composite welding device according to claim 5, characterized in that, The composite welding head is fixed on a three-dimensional five-axis numerical control machine tool or a six-axis robot arm and moves along the welding trajectory.

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