Aluminum alloy thin plate welding device and welding method

Abstract

The present invention relates to the field of aluminum alloy thin plate welding, and specifically to an aluminum alloy thin plate welding device and a welding method. A laser emitting unit, a vibration unit, a spray unit, and a spray cold air delivery pipe; the nozzle module of the spray unit is detachably fixedly connected to the vibration part of the vibration unit; the vibration part is used to drive the nozzle module to vibrate; the nozzle of the nozzle module is connected to the spray cold air delivery pipe; the nozzle is located above the welding area where the laser beam emitted by the laser emitting unit is projected onto the welding specimen, and the nozzle is spaced apart from the welding specimen. This solves the problem that the surface of the welding specimen is easily scratched due to the hard impact of the welding specimen by the existing vibration device during the process of transmitting vibration.

Description

Technical Field

[0001] The invention relates to the field of aluminum alloy thin plate welding, and in particular to an aluminum alloy thin plate welding device and a welding method. Background Art

[0002] Aluminum alloy sheets are widely used in new energy vehicle bodies, aircraft skins and other transportation vehicles due to their high strength and light weight. In order to ensure the safe and stable operation of automobiles and aircraft, the requirements for high-quality connection manufacturing technology of aluminum alloy sheets are getting higher and higher. Laser welding has the advantages of fast welding speed and good welding performance, and is currently widely used in the field of aluminum alloy sheet welding. However, due to the bottlenecks of weak rigidity, fast heat dissipation, easy deformation, and difficult welding quality control, aluminum alloy sheets have become a welding problem that needs to be solved urgently in the application of aluminum alloy sheets.

[0003] The prior art discloses a method for welding aluminum alloy thin plates, and provides an ultrasonic vibration device, wherein an ultrasonic horn is pressed against the lower surface of a first workpiece, and by starting an ultrasonic generator and adjusting the ultrasonic frequency, the molten metal spreads in a narrow gap under ultrasonic high-frequency vibration. The prior art transmits vibration to the first workpiece through the ultrasonic horn, causing the first workpiece to vibrate as well, thereby spreading the molten metal in the narrow gap under ultrasonic high-frequency vibration, achieving a better welding effect. However, the prior art has the problem that when the ultrasonic horn transmits vibration to the first workpiece, it will produce a hard collision with the first workpiece, thereby causing scratches on the surface of the first workpiece when it is hit, affecting the quality of the product. Summary of the invention

[0004] In order to solve the problem that the surface of the welding specimen is easily scratched by the hard impact of the welding specimen during the vibration transmission process of the existing vibration device, the present invention provides an aluminum alloy thin plate welding device and a welding method:

[0005] In a first aspect, this embodiment provides an aluminum alloy sheet welding device, comprising:

[0006] A laser emitting unit, a vibration unit, a spray unit, and a spray cold air delivery pipe; the nozzle module of the spray unit is detachably fixedly connected to the vibration part of the vibration unit; the vibration part is used to drive the nozzle module to vibrate; the nozzle of the nozzle module is connected to the spray cold air delivery pipe; the nozzle is located above the welding area where the laser beam emitted by the laser emitting unit is projected onto the welding specimen, and the nozzle is spaced apart from the welding specimen.

[0007] In some embodiments, the vibration frequency of the vibration part is 20000 Hz-50000 Hz.

[0008] In some embodiments, the nozzle includes an arc-shaped ejection portion, which is connected to the injection cold air delivery pipe, and the gas in the injection cold air delivery pipe can be ejected from the arc-shaped ejection portion to the welding area of ​​the welding specimen.

[0009] In some embodiments, the nozzle also includes a first rectangular mouth ejection portion, one end of the first rectangular mouth ejection portion is connected to one end of the arc-shaped mouth ejection portion; the first rectangular mouth ejection portion and the arc-shaped mouth ejection portion are smoothly transitioned and formed as one piece at the connection; the gas in the injection cold air delivery pipe can be ejected from the first rectangular mouth ejection portion to the welding area of ​​the welding specimen.

[0010] In some embodiments, the nozzle also includes a second rectangular mouth ejection portion, one end of the second rectangular mouth ejection portion is connected to the other end of the arc-shaped mouth ejection portion; the second rectangular mouth ejection portion and the arc-shaped mouth ejection portion are smoothly transitioned and formed as one piece at the connection; the gas in the injection cold air delivery pipe can be ejected from the second rectangular mouth ejection portion into the welding area of ​​the welding specimen.

[0011] In some embodiments, the first rectangular outlet portion, the second rectangular outlet portion, and the arc-shaped outlet portion are symmetrically arranged with the central cross section of the nozzle module as a symmetry plane.

[0012] In some embodiments, the spacing distance between the first rectangular mouth ejection portion, the second rectangular mouth ejection portion, and the arc-shaped mouth ejection portion and the welding specimen is 5 mm-10 mm.

[0013] In some embodiments, the aluminum alloy sheet welding device further includes a shielding gas delivery pipe, which is capable of spraying an inert shielding gas to the laser emitting unit to emit a laser beam to project into the area of ​​the welding specimen.

[0014] In some embodiments, the aluminum alloy thin plate welding device further includes a sliding unit, which is detachably connected to the welding specimen; the sliding unit can drive the welding specimen to move horizontally.

[0015] In a second aspect, the present embodiment provides a method for welding an aluminum alloy sheet, comprising the following steps:

[0016] S11: Turning on the vibration unit, so that the vibration part of the vibration unit drives the nozzle module of the spray unit to vibrate;

[0017] S12: transporting a high-speed cold air flow to the spray cold air delivery pipe, wherein the spray cold air delivery pipe sprays a high-speed cold air flow from the nozzle of the nozzle module to the welding area of ​​the welding test piece, wherein the high-speed cold air flow impacts the welding test piece at the same vibration frequency as that of the vibration part, and the welding test piece vibrates;

[0018] S13: Turn on the laser emitting unit, and the laser emitting unit emits a laser beam to project into the welding area of ​​the welding specimen to weld the welding specimen.

[0019] In order to solve the problem that the surface of the welding test piece is easily scratched by the hard impact of the welding test piece by the existing vibration device during the process of transmitting vibration, the present invention has the following advantages:

[0020] The nozzle module of the injection unit is detachably fixedly connected with the vibration part of the vibration unit; the vibration part is used to drive the nozzle module to vibrate; a high-speed cold air flow is transmitted to the injection cold air delivery pipe, and the injection cold air delivery pipe sprays a high-speed cold air flow from the nozzle of the nozzle module to the welding area of ​​the welding specimen, and the high-speed cold air flow impacts the welding specimen with the same vibration frequency as the vibration part, and the welding specimen vibrates. This can not only make the welding specimen vibrate and the molten metal spread in the narrow gap to achieve a better welding effect, but also avoid hard contact between the vibration device and the welding specimen, and the welding specimen is hit during the vibration of the vibration device, so that the surface of the welding specimen is scratched, resulting in unqualified product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of an aluminum alloy thin plate welding device;

[0022] Figure 2 It is a structural schematic diagram of the injection unit;

[0023] Figure 3 for Figure 1 A local enlarged schematic diagram of point A in the middle.

[0024] In the figure: 10, laser emitting unit; 11, laser beam; 20, vibration unit; 30, high-speed cold air delivery pipe; 40, injection unit; 41, nozzle module; 42, nozzle; 43, positioning column; 50, first positioning block; 60, second positioning block; 70, protective gas delivery pipe; 80, welding specimen; 90, sliding unit; 91, sliding module; 92, driving motor; 93 screw module; 94, slide rail module; 100, support frame. DETAILED DESCRIPTION

[0025] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0026] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0027] This embodiment discloses an aluminum alloy sheet welding device, such as Figure 1 , Figure 2 , Figure 3 As shown, it may include:

[0028] A laser emitting unit 10, a vibration unit 20, a spray unit 40, and a spray cold air delivery pipe; the nozzle module 41 of the spray unit 40 is detachably fixedly connected to the vibration part of the vibration unit 20; the vibration part is used to drive the nozzle module 41 to vibrate; the nozzle 42 of the nozzle module 41 is connected to the spray cold air delivery pipe; the nozzle 42 is located above the welding area where the laser emitting unit 10 emits the laser beam 11 and projects it onto the welding specimen 80, and the nozzle 42 is spaced apart from the welding specimen 80.

[0029] In this embodiment, the nozzle module 41 of the injection unit 40 is detachably fixedly connected with the vibration part of the vibration unit 20; the vibration part is used to drive the nozzle module 41 to vibrate; a high-speed cold air flow is delivered to the injection cold air delivery pipe, and the injection cold air delivery pipe sprays a high-speed cold air flow from the nozzle 42 of the nozzle module 41 to the welding area of ​​the welding specimen 80, and the high-speed cold air flow impacts the welding specimen 80 with the same vibration frequency as the vibration part, and the welding specimen 80 vibrates, which can make the welding specimen 80 vibrate and the molten metal spread in the narrow gap to achieve a better welding effect, and at the same time, it can also avoid hard contact between the vibration device and the welding specimen 80, and the welding specimen 80 is hit during the vibration of the vibration device, so that the surface of the welding specimen 80 is scratched, resulting in unqualified product quality.

[0030] In this embodiment, the fixed end of the vibration unit 20 can be detachably connected to the laser emitting unit 10 through the first positioning block 50, and the detachable connection method can be a bolt connection. The first positioning block 50 has a 90° bent structure. By detachably connecting the vibration unit 20 to one end of the first positioning block 50, and detachably connecting the laser emitting unit 10 to the other end of the first positioning block 50, it is achieved that when the laser emitting unit 10 moves, the vibration unit 20 can move synchronously with the laser emitting unit 10, thereby ensuring the continuity of laser welding and improving the quality of welding products.

[0031] In this embodiment, the vibration part is also detachably fixed with a second positioning block 60, and the injection module is detachably fixed with a positioning column 43. The positioning column 43 is fixedly connected with the second positioning block 60, so that the vibration part can transmit the vibration generated by it to the injection module through the second positioning block 60 and the positioning column 43. During the vibration of the injection module, the high-speed cold airflow ejected from its nozzle 42 impacts the welding specimen 80 at the same frequency as the vibration part, causing the welding specimen 80 to vibrate. At the same time, since the airflow is non-rigid, it will not scratch the welding specimen 80, greatly improving the welding quality.

[0032] In some embodiments, the vibration frequency of the vibration part is 20000 Hz-50000 Hz.

[0033] In this embodiment, the vibration frequency of the vibration part is 20000Hz-50000Hz. Through rapid vibration, the high-speed cold air flow can quickly impact the welding specimen 80, thereby accelerating the vibration frequency of the welding specimen 80, allowing the molten metal to spread faster in the narrow gap, thereby improving the welding efficiency.

[0034] In this embodiment, the vibration frequency of the vibration part can also be the resonance frequency of the welding specimen 80. The rapid cooling airflow quickly impacts the welding specimen 80, thereby increasing the vibration amplitude of the welding specimen 80, allowing the molten metal to spread faster in the narrow gap, thereby improving the welding efficiency.

[0035] In some embodiments, Figure 1 , Figure 2 As shown, the nozzle 42 includes an arc-shaped ejection portion, which is connected to the injection cold air delivery pipe. The gas in the injection cold air delivery pipe can be ejected from the arc-shaped ejection portion to the welding area of ​​the welding specimen 80.

[0036] In this embodiment, an arc-shaped nozzle ejection portion is provided, which can increase the contact area between the high-speed cold airflow and the welding specimen 80, thereby preventing the contact surface between the high-speed cold airflow and the welding specimen 80 from being too small, thereby causing the impact stress on the welding specimen 80 to be too concentrated, resulting in the appearance of grooves on the contact surface between the welding specimen 80 and the high-speed cold airflow.

[0037] In some embodiments, Figure 1 , Figure 2 As shown, the nozzle 42 also includes a first rectangular nozzle portion, one end of which is connected to one end of the arc-shaped nozzle portion; the first rectangular nozzle portion and the arc-shaped nozzle portion are smoothly transitioned and integrally formed at the connection; the gas in the injection cold air delivery pipe can be sprayed from the first rectangular nozzle portion to the welding area of ​​the welding specimen 80.

[0038] In this embodiment, the nozzle 42 includes a first rectangular mouth ejection portion, which is connected to one end of the arc-shaped mouth ejection portion, so that a high-speed cold air flow can also be ejected from the first rectangular mouth ejection portion to impact the welding specimen 80, thereby further increasing the contact area between the high-speed cold air flow and the welding specimen 80, thereby preventing the welding specimen 80 from being subjected to excessively concentrated impact stress, resulting in the formation of grooves on the contact surface between the welding specimen 80 and the high-speed cold air flow.

[0039] In some embodiments, Figure 1 , Figure 2 As shown, the nozzle 42 also includes a second rectangular mouth ejection portion, one end of the second rectangular mouth ejection portion is connected to the other end of the arc-shaped mouth ejection portion; the second rectangular mouth ejection portion and the arc-shaped mouth ejection portion are smoothly transitioned and integrally formed at the connection; the gas in the injection cold air delivery pipe can be ejected from the second rectangular mouth ejection portion into the welding area of ​​the welding specimen 80.

[0040] In this embodiment, the first rectangular mouth ejection part is connected with the other end of the arc-shaped mouth ejection part, thereby realizing the connection among the first rectangular mouth ejection part, the second rectangular mouth ejection part and the arc-shaped mouth ejection part, so that the ejection port 42 is U-shaped, and the laser emitting unit 10 emits a laser beam 11 through the center of the U-shaped structure and projects it onto the welding area of ​​the welding specimen 80, so that the high-speed cold air flow ejected from the U-shaped ejection port 42 can surround the molten pool during the laser welding process, accelerate the temperature reduction, make the welding specimen 80 more evenly stressed, prevent excessive stress concentration, and cause the welding specimen 80 to bend, and can also accelerate the solidification of the molten pool to improve the welding efficiency.

[0041] In some embodiments, the first rectangular outlet portion, the second rectangular outlet portion, and the arc outlet portion are symmetrically arranged with the central cross section of the nozzle module 41 as a symmetry plane.

[0042] In this embodiment, the first rectangular mouth ejection portion, the second rectangular mouth ejection portion, and the arc mouth ejection portion are symmetrically arranged with respect to the central cross-section of the nozzle module 41, and in this embodiment, the positioning column 43 is arranged in the middle of the circumference of the nozzle module 41, so that the vibration generated by the vibration portion can make the nozzle module 41 vibrate more steadily during the transmission process, and the high-speed cold air flow ejected from the nozzle 42 can be evenly sprayed onto the welding specimen 80, thereby making the welding specimen 80 vibrate more steadily.

[0043] In some embodiments, the spacing distance between the first rectangular outlet, the second rectangular outlet, and the arc outlet and the welding specimen 80 is 5 mm-10 mm.

[0044] In this embodiment, by setting the spacing between the first rectangular mouth ejection portion, the second rectangular mouth ejection portion, and the arc-shaped mouth ejection portion and the welding specimen 80 to 5mm-10mm, while ensuring that the high-speed cold airflow effectively impacts the welding specimen 80, it can also avoid the impact force of the high-speed cold airflow being too large, causing local bending of the welding specimen 80.

[0045] In some embodiments, the aluminum alloy sheet welding device further includes a shielding gas delivery pipe 70 , and the shielding gas delivery pipe 70 is capable of spraying an inert shielding gas to the laser emitting unit 10 to emit a laser beam 11 to project into the area of ​​the welding specimen 80 .

[0046] In this embodiment, by adding a protective gas delivery pipe 70, the protective gas delivery pipe 70 can spray the inert protective gas to the area where the laser emitting unit 10 emits the laser beam 11 and projects it onto the welding specimen 80. The inert protective gas acts on the laser welding aluminum alloy droplets, and the inert gas can be a high-pressure inert gas. The high-pressure inert gas impacts the aluminum alloy droplets, so that the aluminum alloy droplets fall into the narrow gap quickly and accurately, prompting the molten aluminum alloy to spread quickly and avoid agglomeration into blocks to cause weld cracks.

[0047] In some embodiments, the aluminum alloy sheet welding device further includes a sliding unit 90 , and the sliding unit 90 is detachably connected to the welding specimen 80 ; the sliding unit 90 can drive the welding specimen 80 to move horizontally.

[0048] In this embodiment, the sliding unit 90 includes a sliding module 91, a driving motor 92, a screw module 93, and a slide rail module 94. The support frame 100 in this embodiment, the slide rail module 94 is detachably arranged on the support frame 100, the sliding module 91 is slidably connected to the slide rail module 94, the driving motor 92 is detachably arranged on the slide rail module 94, one end of the screw module 93 is detachably connected to the output end of the driving motor 92, and the other end is movably connected to the slide rail module 94, and the screw module 93 is threadedly connected to the sliding module 91, and the rotation of the screw can drive the sliding module 91 to slide on the slide rail module 94. In this embodiment, the welding specimen 80 is detachably fixed on the sliding module 91, and the welding specimen 80 is specifically engaged with the sliding module 91 by tightening the bolts. In the process of fixing the welding specimen 80, the welding port needs to be aligned and flush.

[0049] This embodiment provides an aluminum alloy thin plate welding method, which specifically includes the following steps:

[0050] S11: Turn on the vibration unit 20, and the vibration part of the vibration unit 20 drives the nozzle module 41 of the spray unit 40 to vibrate;

[0051] S12: transporting a high-speed cold air flow to the spray cold air delivery pipe, the spray cold air delivery pipe sprays a high-speed cold air flow from the nozzle 42 of the nozzle module 41 to the welding area of ​​the welding test piece 80, the high-speed cold air flow impacts the welding test piece 80 at the same vibration frequency as the vibration part, and the welding test piece 80 vibrates;

[0052] S13 : Turn on the laser emitting unit 10 , and the laser emitting unit 10 emits a laser beam 11 to project into the welding area of ​​the welding specimen 80 to weld the welding specimen 80 .

[0053] In this embodiment, the nozzle module 41 of the injection unit 40 is detachably fixedly connected with the vibration part of the vibration unit 20; the vibration part is used to drive the nozzle module 41 to vibrate; a high-speed cold air flow is delivered to the injection cold air delivery pipe, and the injection cold air delivery pipe sprays a high-speed cold air flow from the nozzle 42 of the nozzle module 41 to the welding area of ​​the welding specimen 80, and the high-speed cold air flow impacts the welding specimen 80 with the same vibration frequency as the vibration part, and the welding specimen 80 vibrates, which can make the welding specimen 80 vibrate and the molten metal spread in the narrow gap to achieve a better welding effect, and at the same time, it can also avoid hard contact between the vibration device and the welding specimen 80, and the welding specimen 80 is hit during the vibration of the vibration device, so that the surface of the welding specimen 80 is scratched, resulting in unqualified product quality.

[0054] In this embodiment, the aluminum alloy sheet welding device may further include a protective gas delivery pipe 70. Before the laser emitting unit 10 is turned on, the protective gas delivery pipe 70 can spray inert protective gas to the laser emitting unit 10 to emit the laser beam 11 and project it into the area of ​​the welding specimen 80. As the laser welding proceeds, the inert gas may be a high-pressure inert gas. By impacting the aluminum alloy droplets with the high-pressure inert gas and impacting the vibration welding specimen 80 with the high-speed cold air flow, the aluminum alloy droplets can be quickly and accurately dropped into the narrow gap, prompting the molten aluminum alloy to spread rapidly and avoid condensation into blocks to cause weld cracks. While preventing the surface of the welding specimen 80 from being scratched, the welding quality can also be improved and the welding efficiency can be increased.

[0055] In this embodiment, a vibration unit 20, a spray unit 40, and a high-speed cold air delivery pipe 30 are combined, and the nozzle 42 is set to be U-shaped. The shape of the nozzle 42 can also be designed according to the edge line of the heated surface of the welding area of ​​the welding specimen 80 during welding, so that the vibrating high-speed cold air flow ejected from the nozzle 42 can cover the heated surface of the welding specimen 80 during welding to the maximum extent, thereby achieving the dual effects of high-frequency vibration and quenching of the high-speed cold air flow, and fully exerting the combined advantages and efficiency of the vibration unit 20 and quenching, thereby improving the welding effect.

[0056] In the above, the vibration unit 20 is an ultrasonic vibration device, one end of the high-speed cold air delivery pipe 30 is connected to the first gas delivery device, the protective gas delivery pipe 70 is connected to the second gas delivery device, and the operation of the laser emitting unit 10, the vibration unit 20, the first gas delivery device, the second gas delivery device, and the drive motor 92 are controlled by an external controller. By controlling the drive motor 92, the screw module 93 can drive the sliding module 91 to move back and forth, and finally complete the entire welding of the weld.

[0057] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present disclosure.

Claims

1. An aluminum alloy sheet welding device, characterized in that: include: A laser emitting unit, a vibration unit, a jet unit, and a jet cold air delivery pipe; the nozzle module of the jet unit is detachably fixedly connected to the vibration part of the vibration unit; the vibration part is used to drive the nozzle module to vibrate; the nozzle of the nozzle module is connected to the jet cold air delivery pipe; the nozzle is located above the welding area of ​​the welding specimen where the laser beam emitted by the laser emitting unit is projected, and the nozzle is spaced apart from the welding specimen; the nozzle includes an arc-shaped mouth ejection part, the arc-shaped mouth ejection part is connected to the jet cold air delivery pipe, and the gas in the jet cold air delivery pipe can be ejected from the arc-shaped mouth ejection part to the welding area of ​​the welding specimen; The nozzle also includes a first rectangular nozzle, one end of which is connected to one end of the arc nozzle; the first rectangular nozzle and the arc nozzle are connected in a smooth transition and are integrally formed; the gas in the injection cold air delivery pipe can be ejected from the first rectangular nozzle to the welding area of ​​the welding specimen; The nozzle also includes a second rectangular nozzle, one end of which is connected to the other end of the arc nozzle; the second rectangular nozzle and the arc nozzle are connected in a smooth transition and are integrally formed; the gas in the injection cold air delivery pipe can be ejected from the second rectangular nozzle into the welding area of ​​the welding test piece; The first rectangular outlet portion, the second rectangular outlet portion, and the arc outlet portion are symmetrically arranged with the central cross section of the nozzle module as a symmetry plane; The nozzle is in a U-shaped structure, and the laser beam passes through the central part of the U-shaped structure and is projected onto the welding area of ​​the welding specimen to generate a molten pool; the high-speed cold air flow ejected from the nozzle is located around the molten pool; Among them, a second positioning block is detachably fixedly provided on the vibration part, and a positioning column is detachably fixedly provided on the nozzle module. The positioning column is fixedly connected to the second positioning block. The vibration part can transmit the vibration generated by it to the nozzle module through the second positioning block and the positioning column. During the vibration of the nozzle module, the high-speed cold air flow ejected from the nozzle impacts the welding specimen at the same frequency as that of the vibration part, causing the welding specimen to vibrate.

2. The aluminum alloy sheet welding device according to claim 1, characterized in that: The vibration frequency of the vibration part is 20000 Hz-50000 Hz.

3. The aluminum alloy sheet welding device according to claim 1, characterized in that: The spacing distance between the first rectangular outlet, the second rectangular outlet, and the arc outlet and the welding specimen is 5mm-10mm.

4. The aluminum alloy sheet welding device according to claim 3, characterized in that: The aluminum alloy thin plate welding device also includes a protective gas delivery pipe, which can spray inert protective gas to the laser emitting unit to emit a laser beam and project it into the area of ​​the welding specimen.

5. The aluminum alloy sheet welding device according to claim 4, characterized in that: The aluminum alloy thin plate welding device further comprises a sliding unit, which is detachably connected to the welding specimen; the sliding unit can drive the welding specimen to move horizontally.

6. A method for welding aluminum alloy thin plates, applied to an aluminum alloy thin plate welding device as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S11: Turning on the vibration unit, so that the vibration part of the vibration unit drives the nozzle module of the spray unit to vibrate; S12: transporting a high-speed cold air flow to the spray cold air delivery pipe, wherein the spray cold air delivery pipe sprays a high-speed cold air flow from the nozzle of the nozzle module to the welding area of ​​the welding test piece, wherein the high-speed cold air flow impacts the welding test piece at the same vibration frequency as that of the vibration part, and the welding test piece vibrates; S13: Turn on the laser emitting unit, and the laser emitting unit emits a laser beam to project into the welding area of ​​the welding specimen to weld the welding specimen.

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