A laser shock based tack welding device and method

Abstract

In the field of laser shock welding, the application provides a laser shock based lap welding device and method, which comprises a laser, a focusing lens, an air cylinder, a waterway assembly and a three-dimensional moving platform; a sample is installed on the three-dimensional moving platform through a clamping assembly installed on the Z-axis of the three-dimensional moving platform, and the three-dimensional moving platform is used to drive the sample to move; the focusing lens is used to focus the pulsed laser beam emitted by the laser into a light spot at the lap welding starting point of the sample; the sample comprises a substrate, a limiting layer, a shock plate, an ablation layer and a constraint layer arranged in sequence, the limiting layer is adhered to the substrate, the shock plate is clamped with the substrate through the clamping assembly, the surface of the shock plate away from the limiting layer is sprayed with an ablation layer, and the constraint layer is attached to the water film on the ablation layer for waterway assembly spraying; the air cylinder is arranged above the light path of the pulsed laser beam focused by the focusing lens, and the air cylinder is used to block the water sprayed by the waterway assembly from splashing on the focusing lens.

Description

Technical Field

[0001] This invention relates to the field of laser shock welding, and more particularly to a laser shock-based lap welding device and method. Background Technology

[0002] With the development of modern industrial technology, metal welding has been widely used in aerospace, transportation, and other fields. In particular, the joining of dissimilar materials at the micrometer scale has broad application value in medical devices and microelectromechanical systems. Laser shock welding is a novel solid-state welding technology suitable for micrometer-scale dissimilar materials and with great application prospects. It offers precise positioning and flexible adjustment of the welding area size, meeting the needs of precision device processing. Laser shock welding belongs to the field of high-speed impact solid-state welding. Its advantages include the absence of a continuous heat-affected zone after welding, the absence of large amounts of intermetallic compounds at the welding interface unlike fusion welding, and the absence of obvious defects such as cracks and holes. The process involves a laser ablating and exciting plasma. The plasma explodes on the material surface under the constraint of a confinement layer, driving the impact plate to collide with the substrate at a suitable angle at high speed.

[0003] Current laser shock welding can achieve spot welding of similar and dissimilar materials, with the weld area typically a few millimeters in diameter. Due to the collision between the impact plate and the substrate, a shock wave is generated on the substrate, and a corresponding reflected shock wave acts on the impact plate. When the reaction force exceeds the plastic deformation yield limit of the impact plate, springback occurs at the weld center. The effective welding area is usually a ring-shaped region excluding the central springback. This result affects weld quality and is detrimental to weld integrity.

[0004] In summary, the current method has the following problems: 1. Unable to complete continuous welding; 2. Low welding efficiency. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a laser shock lap welding device and method. This method utilizes laser shock technology to achieve lap welding production of micro-structures, improving their effective connection range and performance in application environments, particularly enhancing conductivity in electronic systems. Simultaneously, by employing continuous water flow as a constraint, it solves the problem of discontinuous welding in existing laser shock welding due to damage to the solid constraint layer. Specifically, it includes: A laser shock-based lap welding device includes: a laser, a focusing lens, a ventilation duct, a water channel assembly, and a three-dimensional moving platform; The sample is mounted on the three-dimensional moving platform by a clamping assembly mounted on the Z-axis of the three-dimensional moving platform, which is used to move the sample. The focusing lens is used to focus the pulsed laser beam emitted by the laser into a spot, and the spot is located at the welding start point of the sample. The sample comprises a substrate, a limiting layer, an impact plate, an ablation layer, and a constraint layer arranged sequentially. The limiting layer is adhered to the substrate. The impact plate is clamped to the substrate by the clamping assembly. An ablation layer is sprayed onto the surface of the impact plate opposite to the limiting layer. A water film is attached to the ablation layer by the constraint layer, which is sprayed onto the ablation layer by the water channel assembly. The air duct is positioned above the optical path after the pulsed laser beam is focused by the focusing lens. The air duct is used to block the water sprayed from the water channel assembly from splashing onto the focusing lens.

[0006] Preferably, the device also includes a computer, a laser controller, and a water chiller; The laser controller is connected to the computer via a signal, and the water chiller is used to cool the laser.

[0007] Preferably, the ablation layer is black paint.

[0008] Preferably, the device further includes a platform controller, which is connected to the computer via signals and is used to control the operation of the three-dimensional mobile platform.

[0009] Preferably, the water circuit assembly includes a water inlet, a water flow meter, a water inlet pipe, and a water delivery nozzle; The water inlet is connected to the water inlet of the water inlet pipeline, and the water flow meter is installed at the water inlet of the water inlet pipeline; A water nozzle is installed at the outlet of the water inlet pipe, and the water nozzle sprays a water film onto the ablation layer.

[0010] Preferably, the water system assembly further includes a drainage channel and a drainage pipe; The drainage channel is located on the Z-axis of the three-dimensional moving platform and is located below the clamping assembly; The inlet of the drain pipe is connected to the drain trough.

[0011] Preferably, it also includes a lens holder, wherein the focusing lens is mounted on the lens holder; It also includes a mounting bracket, on which the air duct is mounted; The limiting layer has a structure that is closed on all four sides and hollow in the middle.

[0012] A laser-shock-based lap welding method, applied to the aforementioned laser-shock-based lap welding apparatus, is characterized by comprising the following steps: S1. Prepare a sample by mounting the sample onto the clamping assembly; S2. Aim the water nozzle at the ablation layer of the sample and spray water. The water on the ablation layer forms a water film, which serves as a constraint layer for the sample. At the same time, the air duct is turned on, and the air coming out of the air duct forms an air curtain on the optical path after the focusing lens is focused; Meanwhile, the drainage trough discharges the water that falls on the ablation layer through the drainage pipe; S3. The laser controller operates the laser to emit debugging light, and the computer controls the three-dimensional moving platform to move until the light spot formed by the focusing lens is positioned at the welding start point of the sample. S4. The laser parameters of the laser are set by the computer to the laser controller, and the laser is turned on. The pulsed laser beam emitted by the laser passes through the focusing lens and the constraint layer in sequence and then radiates to the ablation layer. The ablation layer vaporizes to form plasma and pushes the impact plate to impact and weld to the substrate. Simultaneously, the computer inputs the movement path of the three-dimensional mobile platform to the platform controller; Until the sample is welded; S5. Remove the welded sample; If there are unwelded samples, replace the unwelded samples with the clamping assembly and proceed to step S3; Otherwise, turn off the laser, the water nozzle, and the three-dimensional moving platform, and then turn off the air duct.

[0013] Preferably, the laser parameters in step S4 include: The diameter of the light spot is set to 2 mm; The laser shock energy density is set at 6.86 GW / cm². 2 .

[0014] Preferably, the laser parameters in S4 further include: an overlap rate of 50% between adjacent laser spots.

[0015] The above technical solution has at least the following advantages compared with the existing technology: The laser-shock-based lap welding device proposed in this invention utilizes flowing water as a constraint, rather than other highly transparent solid media as a constraint layer. This avoids the limitation of plasma caused by the rupture of the solid media due to a single laser strike, which could lead to welding failure. The flowing water always provides constraint to the surface of the impact plate and is not damaged by the laser, thus improving the situation where existing laser-shock welding cannot achieve lap welding. This invention utilizes a combination of laser loading and control systems to automate laser shock welding, achieving high precision and safety while significantly improving production efficiency. The present invention has a simple and environmentally friendly preparation process, low production cost and high production efficiency. It can realize the lap welding of micro-structures using laser shock and is not limited by materials, thus broadening the application range of laser shock welding. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a laser shock-based lap welding device provided in an embodiment of this application; Figure 2 This is a schematic diagram of the sample assembly structure according to an embodiment of this application; Figure 3 This is a schematic diagram of a sample according to an embodiment of this application; Figure 4 This is a flowchart of a laser shock-based lap welding method.

[0018] Figure label: 1. Computer; 2. Water chiller; 3. Laser controller; 4. Laser; 5. Pulsed laser beam; 6. Focusing lens; 7. Lens bracket; 8. Air duct; 9. Mounting bracket; 10. Water nozzle; 11. Water inlet pipe; 12. Water flow meter; 13. Water inlet end; 14. Sample; 15. Clamping assembly; 16. Drainage trough; 17. Drainage pipe; 18. Three-dimensional moving platform; 19. Platform controller; 1401. Substrate; 1402. Limiting layer; 1403. Impact plate; 1404. Ablation layer; 1405. Constraint layer. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising,” “including,” or “including,” and similar terms mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or “connected,” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0021] It should be noted that the terms "up", "down", "left", "right", "front", and "back" used in this invention are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0022] Lap welding between materials not only enables continuous welding, increasing welding area and production efficiency, but also allows for higher joint quality through controlled lap ratio. Furthermore, lap welding significantly enhances the conductivity of joints in the fabrication of micro-components in modern microelectronic systems, such as Cu-Ti dissimilar material connections for integrated circuits and Ti-Al dissimilar material connections for cardiac pacemakers, greatly expanding the application scope of micron-scale dissimilar material connections.

[0023] The purpose of this invention is to achieve lap welding production of micro-structures using laser shock fusion technology, improving their effective connection range and performance in application environments, especially enhancing conductivity in electronic systems. Simultaneously, by employing continuous water flow as a constraint, it solves the problem of discontinuous welding in existing laser shock fusion welding due to damage to the constraint layer. A laser shock fusion welding device and method are provided, as detailed below: like Figures 1 to 3 As shown, a laser shock-based lap welding device includes: a laser 4, a focusing lens 6, a wind tunnel 8, a water channel assembly, and a three-dimensional moving platform 18.

[0024] The sample 14 is mounted on the three-dimensional moving platform 18 via a clamping assembly 15, which is mounted on the Z-axis of the three-dimensional moving platform 18. The three-dimensional moving platform 18 is used to move the sample 14. The focusing lens 6 is used to focus the pulsed laser beam 5 emitted by the laser 4 into a spot, which is located at the welding start point of the sample 14. The sample 14 includes a substrate 1401, a limiting layer 1402, an impact plate 1403, an ablation layer 1404, and a constraint layer 1405 arranged sequentially. The limiting layer 1402... 2. The impact plate 1403 is attached to the substrate 1401 and clamped to the substrate 1401 by the clamping assembly 15. An ablation layer 1404 is sprayed on the surface of the impact plate 1403 away from the limiting layer 1402. The constraint layer 1405 is attached to the water film on the ablation layer 1404 for the water channel assembly to spray onto the ablation layer 1404. The air duct 8 is disposed above the optical path after the focusing lens 6 focuses the pulsed laser beam 5. The air duct 8 is used to block the water sprayed out by the water channel assembly from splashing onto the focusing lens 6.

[0025] In one specific embodiment, the device includes a computer 1, a laser controller 3, a water chiller 2, a laser 4, a focusing lens 6, a wind tunnel 8, a water circuit assembly, and a three-dimensional moving platform 18. The laser controller 3 is connected to the computer 1 via a signal, and the water chiller 2 is used to cool the laser 4. The connections of the water chiller 2, laser 4, computer 1, laser controller 3, etc., are existing technologies and will not be described in detail.

[0026] Among them, such as Figure 1 As shown, the focusing lens 6 is located in the laser emission path between the laser 4 and the sample 14. The spatial position of the focusing lens 6 is adjusted by the lens bracket 7. The structure of the lens bracket 7 is existing technology, supporting not only the installation of the focusing lens 6 but also the adjustment of its position in three-dimensional space, as shown in "CN211929877U - A Lens Bracket 7 for Precision Laser Assembly". The laser controller 3 controls the emission start and parameter settings of the laser 4. The platform controller 19 controls the movement path of the three-dimensional moving platform 18. Both the laser controller 3 and the platform controller 19 are controlled by the computer 1. The clamping assembly 15 can be a robotic arm or other existing clamping structures. The clamping assembly 15 is mounted on the Z-axis of the three-dimensional moving platform 18, which is the moving end of the three-dimensional moving platform 18. The mounting frame 9 is positioned between the focusing lens 6 and the sample 14. The air duct 8 is placed on the mounting frame 9. The air outlet of the air duct 8 is mainly used to form an air curtain to prevent water emitted by the water path assembly from splashing onto the focusing lens 6.

[0027] The water circuit assembly includes an inlet 13, a flow meter 12, an inlet pipe 11, and a water nozzle 10; the inlet 13 is connected to the inlet of the inlet pipe 11, and the flow meter 12 is installed at the inlet of the inlet pipe 11; the water nozzle 10 is installed at the outlet of the inlet pipe 11, and the water nozzle 10 sprays a water film onto the ablation layer 1404.

[0028] like Figure 2 and Figure 3 As shown, sample 14 includes a constraint layer 1405, an ablation layer 1404, an impact plate 1403, a limiting layer 1402, and a substrate 1401; the constraint layer 1405 is a water film formed on the outermost surface of sample 14 (i.e., the ablation layer 1404) by water emitted from the water nozzle 10; the impact plate and the substrate 1401 are separated by the limiting layer and fixed by a clamping assembly.

[0029] The ablation layer 1404 is black paint, and the limiting layer 1402 is a structure that is closed on all sides and hollow in the middle, specifically a rectangular ring frame.

[0030] In a preferred embodiment, the drainage trough 16 is disposed on the Z-axis of the three-dimensional moving platform 18 and is located below the clamping assembly 15; the inlet of the drainage pipe 17 is connected to the drainage trough 16.

[0031] The laser shock-based lap welding device proposed in this invention utilizes flowing water as a constraint, rather than other highly transparent solid media as the constraint layer 1405. This avoids the limitation of plasma caused by the rupture of the solid media due to a single laser strike, which could lead to welding failure. The flowing water always provides constraint to the surface of the impact plate 1403 and is not damaged by the laser, thus improving the situation where existing laser shock welding cannot achieve lap welding.

[0032] This invention employs a combined laser loading and control system to automate laser shock welding, achieving high precision and safety while significantly improving production efficiency. Furthermore, the invention features a simple and environmentally friendly manufacturing process with low production costs and high efficiency. It enables the lap welding of tiny structures using laser shock, is not limited by materials, and broadens the application scope of laser shock welding.

[0033] like Figure 4 As shown, a laser-shock-based lap welding method, applied to the aforementioned laser-shock-based lap welding apparatus, is characterized by comprising the following steps: S1. Prepare sample 14 and mount sample 14 on clamping assembly 15; spray an ablation layer 1404 on the surface of impact plate 1403, attach a fixed shape limiting layer with closed sides and hollow center to the surface of substrate 1401, press the processed impact plate 1403 on the processed substrate 1401, and then place it on clamping assembly 15. The limiting layer 1402 has a closed perimeter and a hollow center. This shape serves to fix the collision angle of each weld point. The ablation layer 1404 is painted black, which can increase the absorption of laser energy.

[0034] S2. Aim the water nozzle 10 at the ablation layer 1404 of the sample 14 and spray water. The water on the ablation layer 1404 forms a water film, which is the constraint layer 1405 of the sample 14. At the same time, the air duct 8 is opened, and the air vented from the air duct 8 forms an air curtain on the optical path after the focusing lens 6 is focused. Meanwhile, the drainage trough 16 discharges the water falling onto the ablation layer 1404 through the drainage pipe 17; specifically including: The water at the inlet 13 is controlled to a fixed flow rate by the water flow meter 12 to ensure the consistency of the water film in the constraint layer 1405. The water is applied to the surface of the sample 14 (the surface of the sample 14 is the ablation layer 1404) through the inlet pipe 11 and the water nozzle 10. The water flows out through the drain trough 16. At the same time, the air duct 8 is activated. The air outlet of the air duct 8 is used to isolate the violent water mist splash generated after the shock wave acts on the water film, maintain the cleanliness of the surface of the focusing lens 6, and avoid adverse consequences caused by laser energy loss and abnormal refraction.

[0035] S3, the laser controller 3 operates the laser 4 to emit adjustment light, and the computer 1 controls the movement of the three-dimensional moving platform until the light spot formed by the focusing lens 6 is positioned at the welding start point of the sample 14, specifically including: The laser controller 3 operates the laser 4 to emit a test beam, and the computer 1 controls the movement of the three-dimensional moving platform 18 to position the center of the beam at the welding start point. The welding start point is selected manually based on experience and is not limited.

[0036] S4. The laser parameters of the laser 4 are set by the computer 1 to the laser controller 3, and the laser 4 is turned on. The pulsed laser beam 5 emitted by the laser 4 passes through the focusing lens 6 and the constraint layer 1405 in sequence and then radiates to the ablation layer 1404. The ablation layer 1404 vaporizes to form plasma and pushes the impact plate 1403 to impact and weld against the substrate 1401. At the same time, the computer 1 inputs the movement path of the three-dimensional moving platform 18 to the platform controller 19 until the sample 14 is welded. Specifically, it includes: Computer 1 controls laser controller 3 to set laser parameters and turn on laser 4; the emitted pulsed laser beam 5, after passing through focusing lens 6 and constraint layer 1405, radiates to ablation layer 1404, causing ablation layer 1404 to vaporize and form plasma, which pushes impact plate 1403 to impact weld onto substrate 1401; computer 1 sets the movement path of three-dimensional moving platform, and starts the command after the first laser emitted by laser 4, realizing the linkage between laser impact welding and three-dimensional moving platform until the command ends the process, and laser 4 also stops emitting.

[0037] S5. Remove the welded sample 14; If there is an unwelded sample 14, the unwelded sample 14 is replaced on the clamping assembly 15, and the process proceeds to step S3. Otherwise, turn off the laser 4, the water nozzle 10, and the three-dimensional moving platform, and then turn off the air duct 8.

[0038] In one specific implementation, the laser parameters in step S4 include: The diameter of the light spot is set to 2 mm; The laser shock energy density is set at 6.86 GW / cm². 2 .

[0039] Preferably, the laser parameters in S4 further include: an overlap rate of 50% between adjacent laser spots.

[0040] The laser-shock-based lap welding method proposed in this invention utilizes flowing water as a constraint, rather than other highly transparent solid media as the constraint layer 1405. This avoids the limitation of plasma caused by the rupture of the solid media due to a single laser strike, which could lead to welding failure. The flowing water consistently constrains the surface of the impact plate 1403 and is not damaged by the laser, improving upon the limitations of existing laser-shock welding methods that cannot achieve lap welding. By combining laser loading and a control system, the laser-shock welding process is automated, offering high precision and safety, and significantly improving production efficiency. This method features a simple and environmentally friendly manufacturing process, low production cost, and high production efficiency. It enables lap welding of micro-structures using laser shock and is not limited by materials, thus broadening the application range of laser-shock welding.

[0041] The following points need to be explained: (1) The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention. Other structures can refer to the general design.

[0042] (2) For clarity, the thickness of layers or regions is enlarged or reduced in the drawings used to describe embodiments of the invention, i.e., these drawings are not drawn to scale. It is understood that when an element such as a layer, film, region, or substrate 1401 is referred to as being “above” or “below” another element, the element may be “directly” located “above” or “below” the other element or there may be intermediate elements.

[0043] (3) Where there is no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0044] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A laser shock-based lap welding device, characterized in that, include: Laser, focusing lens, air duct, water system components, and three-dimensional moving platform; The sample is mounted on the three-dimensional moving platform by a clamping assembly mounted on the Z-axis of the three-dimensional moving platform, which is used to move the sample. The focusing lens is used to focus the pulsed laser beam emitted by the laser into a spot, and the spot is located at the welding start point of the sample. The sample comprises a substrate, a limiting layer, an impact plate, an ablation layer, and a constraint layer arranged sequentially. The limiting layer is adhered to the substrate. The impact plate is clamped to the substrate by the clamping assembly. An ablation layer is sprayed onto the surface of the impact plate opposite to the limiting layer. A water film is attached to the ablation layer by the constraint layer, which is sprayed onto the ablation layer by the water channel assembly. The air duct is positioned above the optical path after the pulsed laser beam is focused by the focusing lens. The air duct is used to block the water sprayed from the water channel assembly from splashing onto the focusing lens. The impact piece and the substrate are separated by a limiting layer; the limiting layer has a structure that is closed on all four sides and hollow in the middle. The shape of the limiting layer, which is closed on all four sides and hollow in the middle, serves to fix the collision angle of each solder point.

2. The laser shock-based lap welding device according to claim 1, characterized in that, It also includes computers, laser controllers, and water chillers; The laser controller is connected to the computer via a signal, and the water chiller is used to cool the laser.

3. The laser shock-based lap welding device according to claim 1, characterized in that, The ablation layer is black paint.

4. The laser shock-based lap welding device according to claim 2, characterized in that, It also includes a platform controller, which is connected to the computer via signals and is used to control the operation of the three-dimensional mobile platform.

5. The laser shock-based lap welding device according to claim 1, characterized in that, The water circuit components include a water inlet, a water flow meter, a water inlet pipe, and a water delivery nozzle; The water inlet is connected to the water inlet of the water inlet pipeline, and the water flow meter is installed at the water inlet of the water inlet pipeline; A water nozzle is installed at the outlet of the water inlet pipe, and the water nozzle sprays a water film onto the ablation layer.

6. The laser shock-based lap welding device according to claim 5, characterized in that, The water system components also include a drainage channel and a drainage pipe; The drainage channel is located on the Z-axis of the three-dimensional moving platform and is located below the clamping assembly; The inlet of the drain pipe is connected to the drain trough.

7. The laser shock-based lap welding device according to claim 1, characterized in that, It also includes a lens holder, on which the focusing lens is mounted; It also includes a mounting bracket on which the air duct is mounted.

8. A laser-shock-based lap welding method, applied to the laser-shock-based lap welding apparatus as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Prepare a sample by mounting the sample onto the clamping assembly; S2. Aim the water nozzle at the ablation layer of the sample and spray water. The water on the ablation layer forms a water film, which serves as a constraint layer for the sample. At the same time, the air duct is turned on, and the air coming out of the air duct forms an air curtain on the optical path after the focusing lens is focused; Meanwhile, the drainage trough discharges the water that falls on the ablation layer through the drainage pipe; S3. The laser controller operates the laser to emit debugging light, and the computer controls the three-dimensional moving platform to move until the light spot formed by the focusing lens is positioned at the welding start point of the sample. S4. The laser parameters of the laser are set by the computer to the laser controller, and the laser is turned on. The pulsed laser beam emitted by the laser passes through the focusing lens and the constraint layer in sequence and then radiates to the ablation layer. The ablation layer vaporizes to form plasma and pushes the impact plate to impact and weld to the substrate. Simultaneously, the computer inputs the movement path of the three-dimensional mobile platform to the platform controller; Until the sample is welded; S5. Remove the welded sample; If there is an unwelded sample, replace the unwelded sample with the clamping assembly and proceed to S3; Otherwise, turn off the laser, the water nozzle, and the three-dimensional moving platform, and then turn off the air duct.

9. The laser shock-based lap welding method according to claim 8, characterized in that, The laser parameters of S4 include: The diameter of the light spot is set to 2 mm; The laser shock energy density is set at 6.86 GW / cm². 2 .

10. The laser shock-based lap welding method according to claim 8, characterized in that, The laser parameters in S4 also include: the overlap rate of adjacent light spots is 50%.

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