Multifunctional test fixture for laser welding of ultrathin metal material

Abstract

The invention is applicable to the technical field of welding and connection, and provides a multifunctional test fixture for laser welding of ultrathin metal materials, which comprises a bottom plate and further comprises two groups of clamping plate assemblies arranged on the bottom plate, and the two groups of clamping plate assemblies are matched to clamp and fix the ultrathin metal materials; the clamping plate assembly comprises a clamp upper plate and a clamp lower plate which are arranged in a matched mode, and the clamping force between the clamp upper plate and the clamp lower plate is controlled through an electromagnetic generator. The bottom plate is provided with the clamping force testing assembly used for testing the clamping force between the clamp upper plate and the clamp lower plate; the sliding block assembly used for fixing the relative position of the clamp upper plate and the clamp lower plate is further installed on the bottom plate, and the position of the sliding block assembly can be adjusted. The device can accurately and reliably test the influence rule of the clamp pressure and the pressure span on the laser welding deformation of the ultrathin metal material.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding and connection, and particularly relates to a multifunctional test fixture for laser welding of ultra-thin metal materials. Background Art

[0002] With the rapid progress of modern industrial technology, ultra-thin metal materials (with a thickness less than 0.2 mm), such as ultra-thin stainless steel and ultra-thin nickel alloy, have been widely used in many fields such as aerospace, automotive manufacturing, electronic equipment, energy conversion, and high-end architectural decoration due to their unique physical and chemical properties. These materials not only have excellent corrosion resistance and high strength but also have the advantages of light weight and easy processing, becoming an important and indispensable part of modern industry. However, during the laser welding process, ultra-thin metal materials face several technical challenges.

[0003] The primary problem is thermal deformation. Due to the extremely small thickness of ultra-thin metal materials, heat is rapidly conducted during welding, easily causing thermal deformation. This not only affects the mechanical properties of the welded joint but also reduces the overall quality and service life of the product. Therefore, how to effectively clamp and fix ultra-thin metal materials has become a key problem in laser welding. Traditional fixtures are difficult to provide stable clamping for such materials. Excessive clamping force will cause material deformation, while insufficient clamping force cannot ensure the stability of the welding process. Therefore, it is particularly important to design a fixture that can achieve stable and controllable clamping force.

[0004] In response to the above challenges, researchers and engineers at home and abroad have conducted extensive explorations. For example, effective clamping of ultra-thin metal materials is achieved through pneumatic, hydraulic, or electromagnetic means. Patent CN 201210195617.4 proposes an adaptive laser welding fixture, which can move with the welding laser head and apply a clamping force only at the welding position, ensuring good contact in the welding area; another patent CN 201410122678.7 introduces a segmented clamping system that uses a cylinder drive to evenly distribute the clamping force and optimize the pressure control. However, the existing fixture designs are highly complex, increasing the manufacturing cost and maintenance difficulty, and restricting the accuracy of pressure parameter regulation.

[0005] In the fine processing and welding of ultra-thin metal materials, precise pressure regulation is crucial, which directly affects the control of material micro-deformation, weld quality, and the performance of the final product. Precise pressure control helps the material to be evenly stressed, optimizes the weld shape, and reduces the occurrence of defects. However, the current pressure control is not precise enough, making it difficult to predict the stress state of the material, affecting the weld quality, and restricting the application potential of ultra-thin metal materials in high-end manufacturing fields.

[0006] Currently, there is a lack of efficient and precise pressure control fixtures specifically designed for laser welding of ultra-thin metals in the market. This gap not only hinders the development of basic research but also limits the possibility of optimizing the welding process through experimental means. Therefore, the development of a fixture capable of achieving fine pressure regulation is of great significance for promoting the progress of ultra-thin metal material processing technology and its application in the high-end manufacturing field. Summary of the Invention

[0007] The purpose of the present invention is to provide a multifunctional test fixture for laser welding of ultra-thin metal materials, aiming to solve the problems mentioned in the above background technology.

[0008] The present invention is realized as follows: A multifunctional test fixture for laser welding of ultra-thin metal materials includes a bottom plate, and further includes: A clamping plate assembly. There are two groups of clamping plate assemblies provided on the bottom plate, and the two groups of clamping plate assemblies cooperate to clamp and fix the ultra-thin metal material; the clamping plate assembly includes a fixture upper plate and a fixture lower plate that are cooperatively arranged, and the magnitude of the clamping force between the fixture upper plate and the fixture lower plate is controlled by an electromagnetic generator. A clamping force testing component. A clamping force testing component for testing the magnitude of the clamping force between the fixture upper plate and the fixture lower plate is installed on the bottom plate. A slider assembly. A slider assembly for fixing the relative positions of the fixture upper plate and the fixture lower plate is also installed on the bottom plate, and the slider assembly can adjust its position.

[0009] A further technical solution: This multifunctional test fixture for laser welding of ultra-thin metal materials is used for testing the influence of the fixture pressure magnitude on the deformation of laser welding of ultra-thin metal materials, the influence of the pressure span on the deformation of laser welding of ultra-thin metal materials, and the influence of the coupling effect of the fixture pressure magnitude and the pressure span on the deformation of laser welding of ultra-thin metal materials.

[0010] A further technical solution: The fixture upper plate and the fixture lower plate are made of dual-phase steel DP1180 with a thickness of 2 mm.

[0011] A further technical solution: An electromagnet placement groove for installing the electromagnetic generator is opened on the bottom plate, and the electromagnetic generator is also electrically connected to a current controller. The electromagnetic generator is used to provide the clamping force required by the clamping plate assembly and precisely control the magnitude of the clamping force by adjusting the current.

[0012] A further technical solution: The clamping force testing component includes a pressure tester placed between the fixture upper plate and the fixture lower plate, and the pressure tester is electrically connected to a pressure value display device.

[0013] Further technical solution: The slider assembly includes a scale and a movable slider. Two scales are fixed on the bottom plate. Slide rails are provided on both of the two scales. Two movable sliders are adjustably and slidably mounted on the slide rails of the scales. Two through holes adapted to the movable sliders are further provided on the upper clamping plate; a fastening bolt for pre-pressing the upper clamping plate is threadedly connected to the movable slider, and the fastening bolt abuts against the through hole.

[0014] Further technical solution: For the multi-functional test fixture for laser welding of ultra-thin metal materials, its test method includes the following steps: First step: Prepare the ultra-thin metal material to be welded, with dimensions of 40 mm × 40 mm and a thickness of 0.1 mm - 0.2 mm. The welding form is lap joint or butt joint, which is determined according to the test requirements and the test target of welding deformation. Second step: Adjust the distance between the two sets of clamping plate assemblies, place the ultra-thin metal material on the surface of the lower clamping plate, place the upper clamping plate above the ultra-thin metal material, and turn the fastening bolt on the movable slider to perform pre-pressing. Third step: Place the pressure tester between the upper clamping plate and the lower clamping plate, turn on the power supplies of the current controller and the pressure tester, adjust the current size of the current controller to further adjust the magnetic force of the electromagnetic generator, stop adjusting when reaching the required welding fixture pressure value and record the size of the pressure value. Fourth step: Turn on the laser welding equipment for welding. After welding is completed, turn off the current controller and the pressure tester, loosen the pre-pressing fastening bolt on the movable slider, remove the upper clamping plate, take off the ultra-thin metal material, and record the welding result. Fifth step: Repeat the first step to the third step, change the current size of the current controller, thereby changing the magnetic force of the electromagnetic generator, adjust the pressure value of the welding clamping plate assembly, and / or change the distance between the two sets of clamping plate assemblies, and then turn on the laser welding equipment for welding, and compare the influence of the welding fixture pressure and / or span on the laser welding deformation of the ultra-thin metal material.

[0015] Further technical solution: In the second step, the pre-pressure is monitored by a pressure tester, and the pre-pressure value is 2 N to 5 N.

[0016] Further technical solution: In the fifth step, after each welding is completed, evaluate the influence of the fixture pressure and / or span on the laser welding deformation of the ultra-thin metal material by observing the deformation condition, weld quality and structural change of the welding specimen.

[0017] The multi-functional test fixture for laser welding of ultra-thin metal materials provided by the present invention has the following beneficial effects: The fixture pressure can be precisely controlled by adjusting the current of the electromagnetic generator; adjusting the positions of the movable slider, the upper fixture plate, and the lower fixture plate can adjust the fixture pressure span, improve the forming accuracy of laser welding of ultra-thin metal materials, and can also accurately and reliably test the influence law of the fixture pressure magnitude and pressure span on the laser welding deformation of ultra-thin metal materials. Brief Description of the Drawings

[0018] Figure 1 It is the assembly drawing of the multifunctional test fixture for laser welding of ultra-thin metal materials provided by an embodiment of the present invention; Figure 2 It is the exploded view of the multifunctional test fixture for laser welding of ultra-thin metal materials provided by an embodiment of the present invention; Figure 3 It is the high-speed camera result diagram of the influence of ultra-thin metal deformation during the laser welding process without applying the multifunctional test fixture for laser welding of ultra-thin metal materials provided by an embodiment of the present invention; Figure 4 It is the high-speed camera result diagram of the influence of ultra-thin metal deformation during the laser welding process when applying the multifunctional test fixture for laser welding of ultra-thin metal materials provided by an embodiment of the present invention.

[0019] In the figure: 1-upper fixture plate, 2-pressure tester, 3-lower fixture plate, 4-electromagnet placement groove, 5-electromagnetic generator, 6-rail groove, 7-scale, 8-bottom plate, 9-movable slider, 10-through hole, 11-ultra-thin metal material. Detailed Embodiments

[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying 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.

[0021] The following describes the specific implementation of the present invention in detail with reference to specific embodiments.

[0022] Embodiment 1 As Figure 1 and Figure 2 shown, a multifunctional test fixture for laser welding of ultra-thin metal materials provided by an embodiment of the present invention is used to test the influence of the fixture pressure magnitude and pressure span on the ultra-thin metal welding deformation, including a bottom plate 8, and further includes: Clamping plate assembly. There are two groups of clamping plate assemblies provided on the bottom plate 8. The two groups of clamping plate assemblies cooperate to clamp and fix the ultra-thin metal material 11 (i.e., the base material). The laser welding path is located between the two groups of clamping plate assemblies. After the fixture is fixed, the laser welding process is completed. The clamping plate assembly includes a cooperating fixture upper plate 1 and a fixture lower plate 3. The magnitude of the clamping force between the fixture upper plate 1 and the fixture lower plate 3 is controlled by an electromagnetic generator 5; Clamping force testing assembly. A clamping force testing assembly for testing the magnitude of the clamping force between the fixture upper plate 1 and the fixture lower plate 3 is installed on the bottom plate 8; Slider assembly. A slider assembly for fixing the relative positions of the fixture upper plate 1 and the fixture lower plate 3 is also installed on the bottom plate 8. The slider assembly can adjust its position.

[0023] As a preferred embodiment of the present invention, this multifunctional test fixture for laser welding of ultra-thin metal materials is used for testing the influence of the fixture pressure magnitude on the laser welding deformation of the ultra-thin metal material 11, the influence of the pressure span on the laser welding deformation of the ultra-thin metal material 11, and the influence of the coupling effect of the fixture pressure magnitude and the pressure span on the laser welding deformation of the ultra-thin metal material 11.

[0024] As a preferred embodiment of the present invention, the fixture upper plate 1 and the fixture lower plate 3 are made of aluminum alloy or other materials with high rigidity and good heat conduction performance to ensure that heat can be evenly conducted during the laser welding process and the base material can be effectively fixed. The contact surfaces of the fixture upper plate 1 and the fixture lower plate 3 can be designed to have a micron-level flatness to ensure that no local deformation of the base material is caused during the clamping process. Preferably, the fixture upper plate 1 and the fixture lower plate 3 are made of 2-mm-thick dual-phase steel DP1180.

[0025] As a preferred embodiment of the present invention, an electromagnet placement groove 4 for installing the electromagnetic generator 5 is provided on the bottom plate 8. The electromagnetic generator 5 is also electrically connected to a current controller. The electromagnetic generator 5 is used to provide the clamping force required by the clamping plate assembly and can precisely control the magnitude of the clamping force by adjusting the current. The selection of the electromagnet should be determined according to the required magnitude of the clamping force to ensure that it can provide a stable clamping force during the welding process. The electromagnetic generator 5 is equipped with a precision control system, which can regulate the magnetic force strength by adjusting the current magnitude, and thus control the pressure applied by the fixture. That is, by adjusting the current controller to change the current intensity, the magnetic field intensity of the electromagnetic generator 5 can be controlled. Under a controllable magnetic field intensity, the fixture upper plate 1 and the fixture lower plate 3 can fit together, and the generated pressure can be displayed by a pressure value display device, thereby achieving the effect of controlling the pressure of the welding fixture.

[0026] As a preferred embodiment of the present invention, the clamping force test assembly includes a pressure tester 2 disposed between the upper fixture plate 1 and the lower fixture plate 3. The pressure tester 2 is electrically connected to a pressure value display device, and the magnitude of the clamping force between the upper fixture plate 1 and the lower fixture plate 3 is tested by the pressure tester 2. The pressure tester 2 is used to monitor the clamping force between the upper fixture plate 1 and the lower fixture plate 3 in real time to ensure that the fixture pressure is maintained within a predetermined range during the welding process. The pressure tester 2 is equipped with a high-precision sensor, which can accurately measure the pressure applied by the fixture and display real-time data. By means of the pressure tester 2, the influence of the pressure applied by the fixture on the test results can be effectively controlled.

[0027] As a preferred embodiment of the present invention, the slider assembly includes a scale 7 and a movable slider 9. Two scales 7 are fixed on the bottom plate 8. Slide rails 6 are provided on both of the two scales 7. Two movable sliders 9 are adjustably and slidably mounted on the slide rails 6 of the scale 7, which is conducive to corresponding and cooperating with two groups of clamping plate assemblies. Two through holes 10 matching with the movable sliders 9 are further provided on the upper fixture plate 1. The movable slider 9 can slide in the slide rail 6 in the scale 7, and the movable slider 9 is equipped with a fastening bolt to pre-press the upper fixture plate 1. The movable slider 9 is connected to the upper fixture plate 1 through the fastening bolt. Before the experiment starts, the upper fixture plate 1 can be pre-pressed by rotating the fastening bolt. The movable slider 9 is designed as an adjustable structure to adapt to different sizes of base materials or different pressure requirements.

[0028] As a preferred embodiment of the present invention, the bottom plate 8 is made of high-strength steel or other materials with good mechanical strength and stability, and its surface is treated with rust prevention, having the characteristics of high temperature resistance and corrosion resistance, serving as the support base of the fixture. Multiple mounting holes and grooves are designed on the bottom plate 8 for fixing other components of the fixture.

[0029] Embodiment 2 As Figures 1 - 4 shown, a test method for a multifunctional test fixture for laser welding of ultra-thin metal materials provided by an embodiment of the present invention includes the following steps: The first step: Prepare the ultra-thin metal material 11 to be welded (i.e., the base material), with a size of 40 mm × 40 mm and a thickness of 0.1 mm - 0.2 mm. Ensure that the surface of the ultra-thin metal material 11 is flat, smooth, free of oil stains and rust (surface cleaning methods such as ultrasonic cleaning or chemical solvent cleaning can be used to ensure that there are no any dirt or impurities on the surface of the base material to avoid affecting the welding quality). The welding form is lap joint or butt joint, which is determined according to the test requirements and the test target of welding deformation.

[0030] Step 2: Adjust the distance between the two sets of clamping plate assemblies to ensure that the lower clamping plate 3 of the fixture can stably support the ultra-thin metal material 11. Place the ultra-thin metal material 11 on the surface of the lower clamping plate 3, ensuring that the base material is placed flat on the lower clamping plate 3 to avoid local stress concentration caused by uneven placement. Place the upper clamping plate 1 of the fixture above the ultra-thin metal material 11 and turn the fastening bolt on the movable slider 9 to apply pre-pressure. At this time, the pre-pressure should be monitored by the pressure tester 2 to ensure that it is within a reasonable range (such as 2 N to 5 N) to prevent uncontrollable deformation of the base material caused by excessive pre-pressure.

[0031] Step 3: Place the pressure tester 2 between the upper clamping plate 1 and the lower clamping plate 3 of the fixture, ensuring that the sensor is in close contact with the surface of the fixture. Turn on the power supplies of the current controller and the pressure tester 2 (not shown), adjust the current magnitude of the current controller to further adjust the magnetic force strength of the electromagnetic generator 5, and stop adjusting and record the magnitude of the pressure value when the required welding fixture pressure value is reached (according to the welding requirements, gradually adjust the pressure value and record the pressure data at each pressure value. At this time, the current value at each adjustment stage and the corresponding fixture pressure should be accurately recorded).

[0032] Step 4: Turn on the laser welding equipment for welding. After welding is completed, turn off the current controller and the pressure tester 2, loosen the pre-pressure fastening bolt on the movable slider 9, remove the upper clamping plate 1 of the fixture, take off the ultra-thin metal material 11, and record the welding results (the morphological changes of the welding specimen, the weld quality, and possible deformation conditions). After the laser welding equipment is started, it should be ensured that the laser power and scanning speed of the welding equipment have been set according to the test requirements. During welding, the pressure applied by the fixture is closely related to factors such as heat conduction during the welding process and thermal expansion of the base material. Therefore, it is necessary to monitor the pressure value in real time to ensure that the pressure change during the welding process is within a controllable range.

[0033] Step 5: Repeat Steps 1 to 3, change the current magnitude of the current controller, thereby changing the magnetic force of the electromagnetic generator 5, adjust the pressure value of the welding clamp assembly, and / or change the distance between the two sets of clamp assemblies. Then turn on the laser welding equipment for welding, and compare the influence of the welding fixture pressure and / or span on the laser welding deformation of the ultra-thin metal material 11. Specifically: First, conduct multiple welding tests under different pressures. After each welding is completed, evaluate the specific influence of the fixture pressure on the laser welding deformation of the ultra-thin metal material 11 by observing the deformation of the welding specimen, the weld quality, and the structural changes of the base material. Combine the pressure data and conduct analysis and comparison to obtain the optimal fixture pressure range. Secondly, conduct multiple welding tests under different distances. In each experiment, adjust the distance between the lower plates 3 of the fixture to change the fixture pressure span. The purpose is to study the specific influence of different fixture pressure spans on the welding deformation. Each time the fixture pressure is adjusted, it is necessary to ensure that the set parameters of the welding equipment remain unchanged to eliminate the influence of other variables. After each welding, analyze the influence of the pressure span on the laser welding deformation of the ultra-thin metal by comparing the welding specimens under different pressure spans and draw corresponding experimental conclusions.

[0034] In the above embodiments of the present invention, a multi-functional test fixture for laser welding of ultra-thin metal materials is provided. By adjusting the current of the electromagnetic generator 5, the fixture pressure can be accurately controlled; adjusting the positions of the movable slider 9, the fixture upper plate 1, and the fixture lower plate 3 can adjust the fixture pressure span, improve the forming accuracy of the laser welding of the ultra-thin metal material 11, and can also accurately and reliably test the influence law of the fixture pressure magnitude and the pressure span on the laser welding deformation of the ultra-thin metal material 11.

[0035] The circuits, electronic components, and modules involved are all prior arts and can be fully realized by those skilled in the art without further elaboration. The content protected by the present invention does not involve improvements to software and methods either.

[0036] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as the scope described in this specification.

[0037] The above embodiments only represent several implementation manners of the present invention, and the description is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A multifunctional test fixture for laser welding of ultra-thin metal materials, comprising a base plate (8), characterized in that: Also includes: A clamping plate assembly, wherein two groups of clamping plate assemblies are provided on the bottom plate (8), and the two groups of clamping plate assemblies cooperate to clamp and fix the ultra-thin metal material (11); the clamping plate assembly comprises a clamp upper plate (1) and a clamp lower plate (3) that are arranged in a coordinated manner, and the clamping force between the clamp upper plate (1) and the clamp lower plate (3) is controlled by an electromagnetic generator (5); A clamping force testing assembly, wherein the base plate (8) is provided with a clamping force testing assembly for testing the clamping force between the clamp upper plate (1) and the clamp lower plate (3); A slider assembly is also mounted on the bottom plate (8) and is used to fix the relative positions of the clamp upper plate (1) and the clamp lower plate (3), and the slider assembly can be adjusted in position.

2. The multifunctional test fixture for laser welding of ultra-thin metal materials according to claim 1 is characterized in that: The multifunctional test fixture for ultra-thin metal material laser welding is used to test the influence of fixture pressure on the deformation of ultra-thin metal material (11) laser welding, the influence of pressure span on the deformation of ultra-thin metal material (11) laser welding, and the influence of the coupling effect of fixture pressure and pressure span on the deformation of ultra-thin metal material (11) laser welding.

3. The multifunctional test fixture for laser welding of ultra-thin metal materials according to claim 1, characterized in that: The clamp upper plate (1) and the clamp lower plate (3) are made of 2 mm thick dual-phase steel DP1180.

4. The multifunctional test fixture for laser welding of ultra-thin metal materials according to any one of claims 1 to 3, characterized in that: The bottom plate (8) is provided with an electromagnet placement slot (4) for installing an electromagnetic generator (5). The electromagnetic generator (5) is also electrically connected to a current controller. The electromagnetic generator (5) is used to provide the clamping force required by the clamping plate assembly, and the magnitude of the clamping force is accurately controlled by adjusting the current.

5. The multifunctional test fixture for laser welding of ultra-thin metal materials according to claim 4, characterized in that: The clamping force testing assembly comprises a pressure tester (2) disposed between a clamp upper plate (1) and a clamp lower plate (3), and the pressure tester (2) is electrically connected to a pressure value display device.

6. The multifunctional test fixture for laser welding of ultra-thin metal materials according to claim 5, characterized in that: The slider assembly comprises a ruler (7) and a movable slider (9), two rulers (7) are fixed on the bottom plate (8), and the two rulers (7) are provided with a slide rail groove (6), and two movable sliders (9) are adjustably slidably mounted on the slide rail groove (6) of the ruler (7), and two through holes (10) matching with the movable sliders (9) are also provided on the clamp upper plate (1); the movable slider (9) is threadedly connected with a fastening bolt for pre-pressing the clamp upper plate (1), and the fastening bolt abuts against the through hole (10).

7. The multifunctional test fixture for laser welding of ultra-thin metal materials according to claim 6, characterized in that: The testing method includes the following steps: Step 1: prepare the ultra-thin metal material (11) to be welded, with a size of 40 mm × 40 mm and a thickness of 0.1 mm to 0.2 mm. The welding form is lap joint or butt joint, which is determined according to the test requirements and the test target of welding deformation; Step 2: Adjust the distance between the two sets of clamping plate assemblies, place the ultra-thin metal material (11) on the surface of the lower plate (3) of the clamp, place the upper plate (1) of the clamp above the ultra-thin metal material (11), and tighten the fastening bolts on the movable slider (9) to pre-press; Step 3: Place the pressure tester (2) between the upper plate (1) and the lower plate (3) of the fixture, turn on the power of the current controller and the pressure tester (2), adjust the current of the current controller and then adjust the magnetic force of the electromagnetic generator (5), and stop adjusting when the required welding fixture pressure value is reached and record the pressure value; Step 4: Turn on the laser welding equipment to start welding. After welding is completed, turn off the current controller and the pressure tester (2), loosen the pre-stressing fastening bolts on the movable slider (9), remove the upper plate of the fixture (1), remove the ultra-thin metal material (11), and record the welding results; Step 5: Repeat steps 1 to 3, change the current of the current controller, thereby changing the magnetic force of the electromagnetic generator (5), adjusting the pressure value of the welding clamp assembly, and / or changing the spacing between the two sets of clamp assemblies, and then start the laser welding equipment to perform welding, and compare the effects of the welding fixture pressure and / or span on the laser welding deformation of the ultra-thin metal material (11).

8. The multifunctional test fixture for laser welding of ultra-thin metal materials according to claim 7, characterized in that: In the second step, the pre-pressure is monitored by a pressure tester (2), and the pre-pressure value is 2N to 5N.

9. The multifunctional test fixture for laser welding of ultra-thin metal materials according to claim 7, characterized in that: In the fifth step, after each welding is completed, the deformation, weld quality and structural changes of the welding specimen are observed to evaluate the effect of the clamp pressure and / or span on the deformation of the laser welding of ultra-thin metal materials (11).

Images