Stainless steel-copper alloy annular light spot laser welding method and system

Abstract

The invention relates to the technical field of metal laser welding, in particular to a stainless steel-copper alloy annular light spot laser welding method and system. The welding method comprises the following steps that annular spot laser is used for welding the to-be-welded positions of the stainless steel and the copper alloy, the to-be-welded positions of the stainless steel and the copper alloy are provided with middle-layer materials, and the to-be-welded positions of the stainless steel and the copper alloy are arranged in parallel in a coincident lap joint mode. The adjustable annular light spot laser beam center and the outer ring laser power are set, the laser energy density distribution is regulated and controlled under the same heat input condition, the welding quality is improved, high-quality welding of stainless steel and copper alloy is achieved, the fusion depth and the fusion width of a welding joint can be changed by changing the adjustable annular light spot laser machining condition, and the welding quality is improved. And by changing the material and the number of layers of the middle layer, metallurgical bonding of the stainless steel and copper alloy welding joint can be enhanced, and the connection strength between the stainless steel and the copper alloy is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal laser welding, and in particular to a stainless steel-copper alloy annular spot laser welding method and system. Background Art

[0002] With the development of welding technology, the application of dissimilar material welds is becoming more and more extensive, especially in high-end fields such as aerospace, navigation and equipment manufacturing. These fields have extremely high performance requirements for structural parts, requiring a combination of multiple properties such as high strength, high thermal conductivity and excellent corrosion resistance. A single material cannot meet these requirements, and dissimilar metal welds can give full play to the excellent properties of different metals, save costs, and bring significant economic benefits. Copper has strong thermal and electrical properties, so copper is often used as a heat exchanger and electrical conductor, but it is more prone to corrosion than steel. Stainless steel has sufficient mechanical and corrosion resistance, and its strength and hardness increase after cold working. At the same time, it can effectively absorb impact energy and provide better safety protection. Although the thermal and electrical properties of stainless steel are not as good as copper, it is still used in the chemical, petroleum and nuclear industries due to its strong mechanical properties and good corrosion resistance. The composite structure of copper and stainless steel can be used in corrosion resistance, strength, heat transfer or conductivity and low temperature, and has excellent performance and cost advantages in military industry, electric power, shipbuilding, automobile and aerospace.

[0003] The melting points of copper and stainless steel are 1085℃ and 1400-1500℃, respectively, and the thermal conductivity coefficients are 400W / mK and 17-19W / mK, respectively. Therefore, welding steel and copper is difficult due to the huge differences in their thermophysical parameters, such as the significant changes in melting point and thermal conductivity between steel and copper, and the penetration of liquid copper into the heat-affected zone of stainless steel, which leads to microcracks and pores. At present, the welding methods of copper and steel dissimilar materials include tungsten inert gas welding, metal arc welding, stir friction welding, laser welding, diffusion welding, brazing, explosion welding and electron beam welding. These methods have their own advantages and disadvantages and are suitable for different welding needs and conditions. For example, tungsten inert gas welding and laser welding provide high precision but are difficult to control; metal arc welding is suitable for large welds but may encounter thermal conductivity problems; diffusion welding and brazing have limited performance in high-temperature applications. Laser welding has the advantages of high energy density, good heat source controllability, and high quality of welded joints, and can achieve welding with a large aspect ratio. However, due to the large differences in the thermophysical parameters of steel and copper, the metallurgical bonding of the welded joint is poor, which easily leads to macroscopic segregation of liquid phase separation, affecting the welding strength of stainless steel and copper alloy. Currently, laser welding of steel / copper dissimilar materials mostly controls the metallurgical bonding of the welded joint by designing the beam offset. Therefore, it is necessary to invent an auxiliary welding process to solve this problem.

[0004] The invention patent with publication number CN112775550A introduces a laser welding method for dissimilar materials of copper and stainless steel. The laser wire-filling welding method is adopted, and the laser beam is deflected toward the stainless steel side to avoid the reflection of the laser by the copper welding wire and the copper. The heat transferred by the molten pool is used to melt the copper welding wire, and then the molten copper welding wire is used to transfer heat to melt the copper base material. However, the problem with this method is that the laser will cause severe high reflection when it hits the copper wire directly, and the copper wire can only be melted by the molten pool temperature. There is a certain instability in the melting of the copper wire by the molten pool, resulting in insufficient metallurgical bonding strength of the formed welded joint. Summary of the invention

[0005] In order to solve the problem of laser welding of dissimilar metals of stainless steel and copper alloy, reduce liquid phase separation, increase metallurgical bonding, and improve the welding bonding strength, the present invention provides a stainless steel-copper alloy annular spot laser welding method and system.

[0006] On the one hand, the present invention provides a stainless steel-copper alloy annular spot laser welding method adopts the following technical solution:

[0007] A stainless steel-copper alloy annular spot laser welding method, comprising the following welding methods:

[0008] Use an annular spot laser to weld stainless steel and copper alloy.

[0009] An intermediate layer material is provided at the place where the stainless steel and the copper alloy are to be welded;

[0010] The stainless steel and copper alloy are welded in parallel and overlapped positions.

[0011] By setting the center of the adjustable annular spot laser beam and the outer ring laser power, the laser energy density distribution can be controlled under the same heat input conditions, the laser absorption rate can be increased, the melting depth and width can be increased, the welding quality can be improved, the generation of defects such as cracks in the joint can be suppressed, and high-quality welding of stainless steel and copper alloy can be achieved. By changing the adjustable annular spot laser processing conditions, the melting depth and width of the weld joint can be changed, thereby changing the forming quality of the weld joint of dissimilar materials. By changing the material and number of layers of the intermediate layer, the metallurgical bonding of the stainless steel and copper alloy weld joints can be enhanced, and the connection strength between stainless steel and copper alloys can be improved.

[0012] Furthermore, the intermediate layer material includes nickel, titanium and molybdenum, the intermediate layer material includes a single layer of a single material or multiple layers of multiple materials, and the intermediate layer material state includes flake or powder.

[0013] The intermediate layer material can form a good metallurgical transition layer between stainless steel and copper alloy, reduce the difference in thermal physical properties between the two materials, inhibit the penetration of copper alloy into the heat-affected zone of stainless steel, reduce the formation of microcracks and pores, and improve the metallurgical bonding strength of the welded joint, thereby improving the mechanical properties and corrosion resistance of the joint.

[0014] Furthermore, the annular spot laser includes two parts of laser, an outer ring laser and an inner ring laser. The core diameter of the outer ring laser fiber is 300 μm, and the core diameter of the inner ring laser fiber at the center is 100 μm.

[0015] The annular spot laser welding method has the characteristics of high energy density and good controllability of heat source. It can achieve efficient and high-quality welding, fast welding speed, and is suitable for large-scale production. The surface of the welded joint is smooth and no subsequent processing is required, which reduces production costs. The annular spot laser welding method has strong adaptability to the shape and size of the workpiece and can weld complex structures and special-shaped workpieces.

[0016] Furthermore, when the stainless steel and copper alloy are overlapped, the stainless steel, the intermediate layer material and the copper alloy are arranged in sequence from top to bottom for overlap, and the annular spot laser welds the stainless steel surface according to the welding path, and the overlap length of the stainless steel and the copper alloy is 10-30 mm.

[0017] The parallel overlapping lap design is adopted for the welding parts of stainless steel and copper alloy, which can increase the welding contact area and improve the load-bearing capacity of the welded joint. The lap design is conducive to the uniform distribution of the energy of the annular spot laser, ensuring the overall quality of the welded joint. The strength and sealing of the welded joint are significantly improved, which is suitable for high-demand application scenarios.

[0018] Furthermore, the two sides of the overlapped joint where the stainless steel and the copper alloy overlap each other in parallel are clamped and fixed by a clamp and then welded by an annular spot laser.

[0019] Through clamping and fixing, the stainless steel and copper alloy to be welded are ensured to fit tightly, avoiding dislocation or gap caused by thermal expansion or vibration of the material during welding. The clamping and fixing can effectively suppress the material deformation caused by thermal stress during welding and ensure the geometric accuracy of the welded joint. The clamp fixing can adapt to workpieces of different shapes and sizes and meet the welding of complex structures or large-sized workpieces.

[0020] Furthermore, the stainless steel and the copper alloy are placed in a protective gas atmosphere box and welded using an annular spot laser.

[0021] The environment in the protective gas atmosphere box is stable, which reduces the interference of external factors on the welding process. The protective gas can effectively isolate oxygen and other impurities in the air to prevent oxidation of stainless steel and copper alloys during welding. The protective gas can stabilize the fluidity and morphology of the welding molten pool and reduce spatter and fluctuations in the molten pool. The welding environment in the protective gas atmosphere box reduces the mixing of impurities and oxides, and significantly improves the mechanical properties of the welded joint.

[0022] Further, the specific welding steps include:

[0023] Cleaning of stainless steel and copper alloy welding joints;

[0024] The cleaned stainless steel and copper alloy are overlapped parallel to each other, and the overlap is filled with an intermediate layer material;

[0025] The parallel overlapping stainless steel and copper alloy are placed in a protective gas atmosphere box and clamped and fixed with a clamp;

[0026] Set the annular spot laser welding path and adjust the initial position of the annular spot laser transmitter;

[0027] Adjust the annular spot laser power, scanning speed and defocus;

[0028] Start the annular spot laser to weld stainless steel and copper alloy.

[0029] Cleaning the weld joint can remove surface oil, oxides and other impurities to ensure the purity of the weld joint. The parallel overlapping design increases the welding contact area. Filling the intermediate layer material can optimize the metallurgical bonding between stainless steel and copper alloy. The protective gas atmosphere box isolates oxygen and impurities in the air. The clamping and fixing ensures the tight fit and stability of the weld joint. Accurately setting the welding path and initial position can ensure the stability and consistency of the welding process. By optimizing the welding parameters, the heat input and energy distribution can be accurately controlled to adapt to the differences in thermal physical properties of stainless steel and copper alloys. The annular spot laser welding method has the characteristics of high energy density and good controllability of the heat source, and can achieve efficient and high-quality welding.

[0030] On the other hand, the present invention provides a stainless steel-copper alloy annular spot laser welding system adopts the following technical solution:

[0031] A stainless steel-copper alloy annular spot laser welding system comprises a laser generator and an atmosphere box, wherein the laser generator is connected to a scanning galvanometer, the scanning galvanometer is movably installed in the atmosphere box, a fixture is installed in the atmosphere box, and the laser generator and the scanning galvanometer are connected to a control box via a control wire.

[0032] Through the synergistic effect of the laser generator and the scanning galvanometer, the system can achieve high-precision welding operations. The flexible adjustment of the scanning galvanometer enables the laser beam to form an accurate annular spot on the workpiece surface, thereby achieving high-quality welding of stainless steel and copper alloy materials. Laser welding has the characteristics of high energy density and rapid heating, which can significantly improve welding efficiency. The design of the annular spot makes the welding process more uniform and reduces the heat-affected zone, thereby improving the welding speed and overall production efficiency. Welding operations in an atmosphere box can effectively prevent oxidation and contamination during the welding process, ensuring the purity and quality of the weld, which is particularly important for the welding of materials such as stainless steel and copper alloys, and can significantly improve the mechanical properties and corrosion resistance of the welded joint.

[0033] Furthermore, the scanning galvanometer is mounted on an industrial robot and is controlled by the industrial robot to move in the atmosphere box.

[0034] The industrial robot has multi-axis motion capability and can realize complex three-dimensional path planning. The scanning galvanometer combined with the movement of the industrial robot can accurately control the position and angle of the laser beam over a larger range to meet the welding requirements of workpieces with complex geometric shapes, significantly improving the flexibility and adaptability of the system. By controlling the movement of the scanning galvanometer through the industrial robot, the system can realize fully automated welding operations. The operator only needs to set the welding parameters and path planning through the control box, and the system can automatically complete the welding task, reducing human intervention and improving production efficiency and reliability.

[0035] Furthermore, the above-mentioned stainless steel-copper alloy annular spot laser welding method is used to perform welding operations.

[0036] In summary, the present invention has the following beneficial technical effects:

[0037] 1. Set the center of the adjustable annular spot laser beam and the outer ring laser power to achieve the control of laser energy density distribution under the same heat input conditions, increase laser absorption rate, increase melting depth and width, improve welding quality, inhibit the generation of defects such as cracks in the joint, and achieve high-quality welding of stainless steel and copper alloy. By changing the adjustable annular spot laser processing conditions, the melting depth and width of the welded joint can be changed, thereby changing the forming quality of the welded joint of dissimilar materials. By changing the material and number of layers of the intermediate layer, the metallurgical bonding of the stainless steel and copper alloy welded joints can be enhanced, and the connection strength between stainless steel and copper alloys can be improved.

[0038] 2. The intermediate layer material can form a good metallurgical transition layer between stainless steel and copper alloy, reduce the difference in thermal physical properties between the two materials, inhibit the penetration of copper alloy into the heat-affected zone of stainless steel, reduce the formation of microcracks and pores, and improve the metallurgical bonding strength of the welded joint, and improve the mechanical properties and corrosion resistance of the joint.

[0039] 3. The annular spot laser welding method has the characteristics of high energy density and good controllability of heat source. It can achieve efficient and high-quality welding, fast welding speed, suitable for large-scale production, smooth surface of welded joints, no need for subsequent processing, and reduced production costs. The annular spot laser welding method has strong adaptability to the shape and size of the workpiece, and can weld complex structures and special-shaped workpieces.

[0040] 4. The parallel overlapping lap design is adopted for the welding parts of stainless steel and copper alloy, which can increase the welding contact area and improve the bearing capacity of the welded joint. The lap design is conducive to the uniform distribution of the energy of the annular spot laser, ensuring the overall quality of the welded joint. The strength and sealing of the welded joint are significantly improved, which is suitable for high-demand application scenarios.

[0041] 5. Through clamping and fixing, ensure that the stainless steel and copper alloy to be welded are tightly fitted to avoid dislocation or gap caused by thermal expansion or vibration of the material during welding. Clamp clamping can effectively suppress material deformation caused by thermal stress during welding and ensure the geometric accuracy of the welded joint. Clamp fixing can adapt to workpieces of different shapes and sizes and meet the welding of complex structures or large-size workpieces.

[0042] 6. The environment in the protective gas atmosphere box is stable, which reduces the interference of external factors on the welding process. The protective gas can effectively isolate oxygen and other impurities in the air to prevent the oxidation of stainless steel and copper alloys during welding. The protective gas can stabilize the fluidity and shape of the welding molten pool and reduce the spatter and fluctuation of the molten pool. The welding environment in the protective gas atmosphere box reduces the mixing of impurities and oxides, and significantly improves the mechanical properties of the welded joint.

[0043] 7. Cleaning the weld joint can remove surface oil, oxides and other impurities to ensure the purity of the weld joint. The parallel overlap design increases the welding contact area. Filling the intermediate layer material can optimize the metallurgical bonding between stainless steel and copper alloy. The protective gas atmosphere box isolates oxygen and impurities in the air. The clamping and fixing ensures the close fit and stability of the weld joint. Accurately setting the welding path and initial position can ensure the stability and consistency of the welding process. By optimizing the welding parameters, the heat input and energy distribution can be accurately controlled to adapt to the differences in the thermal physical properties of stainless steel and copper alloys. The annular spot laser welding method has the characteristics of high energy density and good controllability of the heat source, and can achieve efficient and high-quality welding.

[0044] 8. Through the synergistic effect of the laser generator and the scanning galvanometer, the system can achieve high-precision welding operations. The flexible adjustment of the scanning galvanometer enables the laser beam to form an accurate annular spot on the surface of the workpiece, thereby achieving high-quality welding of stainless steel and copper alloy materials. Laser welding has the characteristics of high energy density and rapid heating, which can significantly improve welding efficiency. The design of the annular spot makes the welding process more uniform and reduces the heat-affected zone, thereby improving the welding speed and overall production efficiency. Welding operations in an atmosphere box can effectively prevent oxidation and contamination during welding, and ensure the purity and quality of the weld. This is especially important for the welding of materials such as stainless steel and copper alloys, and can significantly improve the mechanical properties and corrosion resistance of the welded joint.

[0045] 9. The industrial robot has multi-axis motion capability and can realize complex three-dimensional path planning. The scanning galvanometer combined with the movement of the industrial robot can accurately control the position and angle of the laser beam over a larger range to meet the welding requirements of workpieces with complex geometric shapes, significantly improving the flexibility and adaptability of the system. By controlling the movement of the scanning galvanometer through the industrial robot, the system can realize fully automated welding operations. The operator only needs to set the welding parameters and path planning through the control box, and the system can automatically complete the welding task, reducing manual intervention and improving production efficiency and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the welding principle of the present invention;

[0047] Figure 2 This is a connection diagram of the welding device of the present invention;

[0048] Figure 3 It is a cross-sectional view of the welding material of the present invention;

[0049] Figure 4 It is a schematic diagram of the welding process of the present invention.

[0050] Description of reference numerals:

[0051] 1. Laser generator, 2. Scanning galvanometer, 3. Industrial robot, 4. Atmosphere box, 5. Fixture, 6. Control box. DETAILED DESCRIPTION

[0052] The following will be combined with the attached Figure 1-Figure 4 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0054] Embodiment 1:

[0055] The embodiment of the present invention discloses a stainless steel-copper alloy annular spot laser welding method, referring to Figure 1-Figure 3 , including the following welding methods:

[0056] Use an annular spot laser to weld stainless steel and copper alloy.

[0057] An intermediate layer material is provided at the place where the stainless steel and the copper alloy are to be welded;

[0058] The stainless steel and copper alloy are welded in parallel and overlapped positions.

[0059] The adjustable annular spot laser used in the laser welding process of stainless steel and copper alloy includes lasers with various pulse widths, wavelengths, frequencies and energies. The light sources include lasers of different bands such as infrared light, blue light and green light.

[0060] The adjustable annular spot laser welding process refers to increasing the laser in the welding process of dissimilar materials, increasing the melting depth and width of the weld, and increasing the metallurgical bonding of the weld joint by controlling the outer ring laser power and the inner ring laser power of the adjustable annular spot laser beam.

[0061] Embodiment 2:

[0062] On the basis of Example 1:

[0063] Reference Figure 1-Figure 3 The intermediate layer material includes nickel, titanium and molybdenum, the intermediate layer material includes a single layer of a single material or multiple layers of multiple materials, and the intermediate layer material state includes flake or powder.

[0064] Reference Figure 1-Figure 3 The annular spot laser includes two parts of laser: outer ring laser and inner ring laser. The core diameter of the outer ring laser fiber is 300 μm, and the core diameter of the inner ring laser fiber at the center is 100 μm.

[0065] Adjustable center-ring laser power range 0-5000W.

[0066] Reference Figure 1-Figure 3When the stainless steel and copper alloy are overlapped, the stainless steel, the middle layer material and the copper alloy are arranged in sequence from top to bottom for overlap, and the annular spot laser welds the stainless steel surface according to the welding path. The overlap length of the stainless steel and the copper alloy is 10-30 mm.

[0067] Reference Figure 1-Figure 3 The stainless steel and the copper alloy are parallel to each other and overlapped at both sides by clamping and fixing by a clamp, and then welded by an annular spot laser.

[0068] Reference Figure 1-Figure 3 The stainless steel and the copper alloy are placed in a protective gas atmosphere box and welded using an annular spot laser.

[0069] Reference Figure 4 , the specific welding steps include:

[0070] Clean the welded joints of stainless steel and copper alloys to remove impurities such as surface oxide layers;

[0071] The cleaned stainless steel and copper alloy are overlapped parallel to each other, and the overlap is filled with an intermediate layer material;

[0072] The parallel overlapping stainless steel and copper alloy are placed in a protective gas atmosphere box and clamped and fixed with a clamp;

[0073] Set the annular spot laser welding path and adjust the initial position of the annular spot laser transmitter;

[0074] Adjust the annular spot laser power, scanning speed and defocus;

[0075] Start the annular spot laser to weld stainless steel and copper alloy;

[0076] Select the welding area, plan the laser welding path, and use the laser welding galvanometer to weld on the stainless steel surface.

[0077] The two base materials, stainless steel and copper alloy, to be welded are pre-treated by grinding and polishing to remove surface oxide film and impurities, or by laser cleaning.

[0078] The middle layer can be a single-layer metal material such as Ni, or a composite multi-layer metal material such as Ni, Ti, Mo, etc. The middle layer material can be in the form of flakes or powder, and can be a single layer or multiple layers.

[0079] By optimizing the process parameters, good welding of stainless steel and copper alloy can be achieved, the welding joint has high forming quality, and no defects such as spatter and cracks are generated. By observing the microstructure of the cross-sectional weld, it can be found that stainless steel and copper alloy achieve good metallurgical bonding, and adding the Ni layer can increase the transition between stainless steel and copper alloy, increase the metallurgical bonding of the stainless steel and copper alloy welded joints, and reduce liquid phase separation. Through tensile testing, it can be seen that after adding the intermediate layer Ni, the tensile strength and plasticity of the stainless steel and copper alloy welded joints are increased.

[0080] Embodiment 3:

[0081] The embodiment of the present invention discloses a stainless steel-copper alloy annular spot laser welding system, referring to Figure 1 and Figure 2 , including a laser generator 1 and an atmosphere box 4, wherein the laser generator 1 is connected to a scanning galvanometer 2, wherein the scanning galvanometer 2 is movably installed in the atmosphere box 4, wherein a fixture 5 is installed in the atmosphere box 4, and the laser generator 1 and the scanning galvanometer 2 are connected to a control box 6 via a control wire.

[0082] Reference Figure 1 and Figure 2 The scanning galvanometer 2 is mounted on the industrial robot 3 and is controlled by the industrial robot 3 to move in the atmosphere box 4.

[0083] The welding operation is performed using a stainless steel-copper alloy annular spot laser welding method as described in Specific Examples 1 and 2, with reference to the following specific welding test process:

[0084] After sanding 100*50*2mm stainless steel and 100*50*3mm copper alloy, clean them with alcohol and blow dry them, and then fix them in the overlap form of "stainless steel on top and copper alloy on bottom", with an overlap length of 20mm. Fix the intermediate layer materials Ni, Ti, etc. between the stainless steel and the copper alloy, and the thickness of the intermediate layer materials Ni and Ti is 0.1-3mm.

[0085] The light source formed by the adjustable annular spot laser with a wavelength of 1064nm is used as the light source for adjustable annular spot laser welding of stainless steel and copper alloy with an added intermediate layer.

[0086] The processing parameters are as follows: the outer ring laser power is 1000-5000W, the inner ring laser power is 1000-3000W, the scanning speed is 10-100mm / s, the defocus amount is -5-+5mm, the coaxial blowing method is adopted to protect the gas flow rate of 15L / min, and the laser welding head deviates by 6° along the vertical laser travel direction.

[0087] Place the overlapped stainless steel and copper alloy into a special fixture, set the corresponding clamping pressure, select the processing area, plan the laser welding path, and use the laser welding galvanometer to weld the stainless steel.

[0088] After completion, all equipment is turned off to complete the process of laser lap welding of stainless steel and copper alloy with adjustable annular spot with added intermediate layer.

[0089] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A stainless steel-copper alloy annular spot laser welding method, characterized in that: The following welding methods are included: Use an annular spot laser to weld stainless steel and copper alloy. An intermediate layer material is provided at the place where the stainless steel and the copper alloy are to be welded; The stainless steel and copper alloy are welded in parallel and overlapped positions.

2. A stainless steel-copper alloy annular spot laser welding method according to claim 1, characterized in that: The intermediate layer material includes nickel, titanium and molybdenum, the intermediate layer material includes a single layer of a single material or multiple layers of multiple materials, and the intermediate layer material state includes flake or powder.

3. The stainless steel-copper alloy annular spot laser welding method according to claim 1, characterized in that: The annular spot laser includes two parts of laser, an outer ring laser and an inner ring laser. The core diameter of the outer ring laser fiber is 300 μm, and the core diameter of the inner ring laser fiber at the center is 100 μm.

4. The stainless steel-copper alloy annular spot laser welding method according to claim 1, characterized in that: When the stainless steel and copper alloy are overlapped, the stainless steel, the middle layer material and the copper alloy are arranged in sequence from top to bottom for overlap, and the annular spot laser welds the stainless steel surface according to the welding path. The overlap length of the stainless steel and copper alloy is 10-30 mm.

5. The stainless steel-copper alloy annular spot laser welding method according to claim 1, characterized in that: The two sides of the overlapped joint where the stainless steel and the copper alloy overlap each other in parallel are clamped and fixed by a clamp, and then welded by an annular spot laser.

6. The stainless steel-copper alloy annular spot laser welding method according to claim 1, characterized in that: The stainless steel and the copper alloy are placed in a protective gas atmosphere box and welded using an annular spot laser.

7. A stainless steel-copper alloy annular spot laser welding method according to any one of claims 1-6, characterized in that: The specific welding steps include: Cleaning of stainless steel and copper alloy welding joints; The cleaned stainless steel and copper alloy are overlapped parallel to each other, and the overlap is filled with an intermediate layer material; The parallel overlapping stainless steel and copper alloy are placed in a protective gas atmosphere box and clamped and fixed with a clamp; Set the annular spot laser welding path and adjust the initial position of the annular spot laser transmitter; Adjust the annular spot laser power, scanning speed and defocus; Start the annular spot laser to weld stainless steel and copper alloy.

8. A stainless steel-copper alloy annular spot laser welding system, characterized in that: The invention comprises a laser generator (1) and an atmosphere box (4), wherein the laser generator (1) is connected to a scanning galvanometer (2), the scanning galvanometer (2) is movably installed in the atmosphere box (4), a fixture (5) is installed in the atmosphere box (4), and the laser generator (1) and the scanning galvanometer (2) are connected to a control box (6) via a control wire.

9. A stainless steel-copper alloy annular spot laser welding system according to claim 8, characterized in that: The scanning galvanometer (2) is mounted on an industrial robot (3) and is controlled by the industrial robot (3) to move within an atmosphere box (4).

10. The stainless steel-copper alloy annular spot laser welding system according to claim 8, characterized in that: The welding operation is performed using the stainless steel-copper alloy annular spot laser welding method as described in claim 7.

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