Laser welding device

Abstract

The application relates to a laser welding device, which comprises a laser device main body. The laser device main body can output two lasers arranged at an included angle and in a polarization state. Each of the two lasers is focused on a workpiece to be welded and forms a first light spot on the workpiece. The two first light spots are close to each other and synchronously focused on two sides of a welding wire on the workpiece to be welded, forming a symmetrical laser energy beam. Then, bidirectional penetration and efficient superposition of energy are realized in the workpiece to be welded, so that the weld of the workpiece to be welded is uniformly fused from the middle to the two sides, the welding wire is efficiently and completely melted and welded to the workpiece to be welded, and the problem that a single-sided light spot cannot penetrate a thick plate in the prior art is solved, and the welding efficiency and welding quality are improved.

Description

Technical Field

[0001] This application relates to the field of welding apparatus technology, and in particular to a laser welding apparatus. Background Technology

[0002] In modern industrial manufacturing, welding technology is considered the "steel link" connecting the industrial framework, and laser welding, with its high efficiency and precision, has become a core support for precision manufacturing. However, for a long time, there has been a difficult-to-overcome technological gap in the field of laser welding—traditional laser welding guns can only achieve single-sided spot operation, which is sufficient for thin plates, but becomes inadequate when it comes to thick plate welding. Thick plate welding has long relied on inefficient processes such as traditional arc welding, which is not only time-consuming and labor-intensive, but also makes it difficult to guarantee weld quality, seriously hindering the development of high-end equipment manufacturing. Summary of the Invention

[0003] Therefore, it is necessary to provide a laser welding apparatus that can improve welding quality and welding efficiency in order to solve at least one of the problems in the related technologies.

[0004] This application provides a laser welding apparatus, comprising:

[0005] The main body of the laser device can output two laser beams that are set at an angle and are both in a polarized state; each of the two laser beams is focused on the workpiece to be welded and forms a first spot on the workpiece. The first spots formed by the two laser beams are close to each other so that they are on both sides of the same welding wire, thereby melting and welding the welding wire to the workpiece.

[0006] In one embodiment, the main body of the laser device includes two laser output tubes and a galvanometer assembly; the two laser output tubes are arranged side by side with a gap between them, and the galvanometer assembly includes two convex lenses, each of the convex lenses being arranged with a gap between it and the output end of each of the laser output tubes; the second light spot formed by each laser output tube on the surface of each of the convex lenses is located on one side away from each other from the center point of the two convex lenses.

[0007] In one embodiment, the galvanometer assembly further includes a swing motor and a support; the swing motor is connected to the support and is used to drive the support to swing back and forth; both convex lenses are mounted on the support and are located on opposite sides of the central axis of the swing motor.

[0008] In one embodiment, the oscillating motor is disposed at the interval between the two laser output tubes; and / or, the bracket includes two first lens barrels and a connector, the two first lens barrels are connected by the connector, each of the convex lenses is correspondingly installed in each of the first lens barrels, and the oscillating motor is connected to the connector.

[0009] In one embodiment, the main body of the laser device further includes a first collimating lens, which is correspondingly disposed at the output end of the laser output tube;

[0010] And / or, the main body of the laser device further includes a cooling mechanism for cooling the laser output tube.

[0011] In one embodiment, the main body of the laser device further includes a focusing component disposed on the side of the convex lens away from the laser output tube, and the focusing component includes a second collimating lens.

[0012] In one embodiment, the main body of the laser device further includes two protective air tubes located on the side of the convex lens away from the laser output tube. The two protective air tubes are arranged at an angle, and each protective air tube is corresponding to the laser output from each convex lens. The laser output from each convex lens enters the corresponding protective air tube and is then output.

[0013] In one embodiment, the focusing assembly is mounted on one end of the protective air tube near the convex lens; the focusing assembly further includes a second lens barrel, a protective lens, and a second retaining ring; the protective lens, the second collimating lens, and the second retaining ring are sequentially disposed inside the second lens barrel.

[0014] In one embodiment, the laser welding apparatus further includes a welding wire feeding mechanism connected to the main body of the laser apparatus. The welding wire feeding mechanism is used to output the welding wire, and the welding wire is located between the two laser beams.

[0015] In one embodiment, the laser welding apparatus further includes a controller, and the main body of the laser apparatus and the welding wire feeding mechanism are both electrically connected to the controller. The controller is used to adjust the wire feeding speed of the welding wire feeding mechanism according to the laser energy parameters of the welding wire feeding mechanism.

[0016] The aforementioned laser welding apparatus, in use, provides two laser beams positioned at an angle and in a polarized state. Each laser beam forms a first spot on the workpiece to be welded. The two first spots are close to each other and synchronously focused on both sides of the same welding wire on the workpiece, forming symmetrical laser energy beams. This allows for bidirectional energy penetration and efficient superposition within the workpiece, resulting in uniform fusion of the weld seam from the center to both sides. This efficiently and completely melts the welding wire and welds it to the workpiece, completely solving the problem of single-sided laser spots being unable to penetrate thick plates in related technologies, thus improving welding efficiency and quality. Attached Figure Description

[0017] Figure 1 This is a structural diagram of a laser welding apparatus according to an embodiment of this application.

[0018] Figure 2 for Figure 1 Enlarged structural diagram at point A.

[0019] Figure 3 for Figure 1 The diagram shows the structure of the laser output tube forming a second light spot on the convex lens in the laser welding device.

[0020] Figure 4 for Figure 1 The diagram shows the structure of the laser welding device in which two laser beams form two first spots.

[0021] Figure 5 for Figure 1 The diagram shows the structure of the polarization component in the laser welding device.

[0022] Figure 6 for Figure 5 The diagram shows the exploded structure of the polarization component.

[0023] Figure 7 for Figure 1 The diagram shows the structure of the focusing component in the laser welding device.

[0024] Figure 8 for Figure 7 The exploded structure diagram of the focusing component is shown.

[0025] Explanation of reference numerals in the attached figures:

[0026] 10. Main body of laser device; 11. Laser output tube; 12. Galvanometer assembly; 121. Convex lens; 122. Swing motor; 123. Support; 1231. First lens barrel; 1232. Connector; 124. First retaining ring; 13. Dual-channel fiber optic output section; 14. Cooling mechanism; 141. Liquid inlet connector; 142. Liquid outlet connector; 15. Focusing assembly; 151. Second collimating lens; 152. Second lens barrel; 153. Protective lens; 154. Second retaining ring; 16. Protective gas pipe; 161. Gas inlet connector; 20. Workpiece to be welded; 30. First laser spot; 40. Integrated laser spot; 50. Second laser spot; 60. Welding wire feeding mechanism; 61. Feeding pipe; Z. Reference line. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] As described in the background section, laser welding in related technologies cannot meet the requirements for welding quality and efficiency in thick plates. This is because laser welding in these technologies can only achieve single-sided spot welding, which has limited energy and low heat transfer efficiency. The single-sided laser beam is focused on one side of the plate, and the energy accumulates on the surface of the thick plate but is difficult to penetrate effectively. This easily leads to defects such as surface overmelting and insufficient bottom fusion, resulting in poor weld formation, low strength, and the need for repeated welding, which not only prolongs the production cycle but also increases the intensity of manual labor and material waste.

[0029] It is precisely in the face of such industrial pain points and technical difficulties that this application provides a laser welding device, which is a technical solution that can improve welding quality and welding efficiency, and can meet the urgent needs of various fields such as shipbuilding, heavy machinery, and bridge engineering for thick plate welding, filling the gap in thick plate laser welding.

[0030] It should be noted that the thickness of the thin plate in this embodiment refers to 1mm-5mm; the thickness of the thick plate in this embodiment refers to a thickness greater than 5mm.

[0031] See Figures 1 to 4 This application provides a laser welding apparatus, including a laser apparatus body 10. The laser apparatus body 10 can output two laser beams that are angled together and both are polarized. Each of the two laser beams is focused on a workpiece 20 to be welded and forms a first spot 30 on the workpiece 20. The workpiece 20 to be welded includes, but is not limited to, plates, which can be thick or thin plates, and is not limited thereto. The workpiece 20 has a weld seam, and the welding wire is arranged corresponding to the weld seam.

[0032] In this process, the first spot 30 formed by the two laser beams is brought close to each other so that it is on both sides of the same welding wire, thereby melting the welding wire and welding it to the workpiece 20 to be welded.

[0033] In use, the laser welding device described above provides two laser beams, angled and polarized, from the main body 10. Each laser beam forms a first spot 30 on the workpiece 20 to be welded. The two first spots 30 are close to each other and simultaneously focused on both sides of the same welding wire on the workpiece 20, forming symmetrical laser energy beams. This allows for bidirectional energy penetration and efficient superposition within the workpiece 20, resulting in uniform fusion of the weld seam from the center to both sides. This efficiently and completely melts the welding wire and welds it to the workpiece 20, completely solving the problem of single-sided laser spots being unable to penetrate thick plates in related technologies, thus improving welding efficiency and quality.

[0034] Please see Figures 2 to 4 Based on the aforementioned embodiments, the main body 10 of the laser device includes two laser output tubes 11 and a galvanometer assembly 12. The two laser output tubes 11 are arranged side by side with a gap, and each laser output tube 11 is used to output laser light. The galvanometer assembly 12 includes two convex lenses 121. Each convex lens 121 is arranged with a gap relative to the output end of each laser output tube 11. The second light spot 50 formed by each laser output tube 11 on the surface of the corresponding convex lens 121 is located on the side away from the center point of the two convex lenses 121. That is, if the center of the two convex lenses 121 is connected, and the straight line passing through the midpoint of the connecting line and perpendicular to the connecting line is taken as the reference line Z, the distance S1 between the second light spot 50 formed by each laser output tube 11 on the surface of the convex lens 121 and the reference line Z is greater than the distance S2 between the center point of the corresponding convex lens 121 and the reference line Z. Thus, each convex lens 121 can refract the laser output from the laser output tube 11, adjusting the two parallel laser beams into two laser beams set at an angle, so that the two laser beams converge on both sides of the same welding wire. Furthermore, under the power provided by the galvanometer assembly 12, the laser is polarized, and each laser beam forms an arc-shaped first spot 30 on each side of the welding wire, such as... Figure 3 As shown. The two first light spots 30 are close to each other to form a shape like... Figure 4 The integrated laser spot 40 shown is circular or elliptical. It is evident that it has the following technical effects: (1) Improved molten pool quality: simultaneous heating by dual lasers forms a larger molten pool, significantly increasing weld depth and resulting in a stronger weld, suitable for thick plate welding. (2) Optimized energy efficiency: energy supply from both sides avoids energy accumulation on one side, making the molten pool more uniform and stable, thus improving welding efficiency. (3) Space saving: two convex lenses 121 convert the two parallel laser beams into two laser beams set at an angle, achieving dual laser focusing within a limited space and solving the problem of excessively large angles in traditional direct-beam paths.

[0035] Please see Figure 2 , Figure 5 and Figure 6In some embodiments, the galvanometer assembly 12 further includes a oscillating motor 122 and a support 123. The oscillating motor 122 is connected to the support 123 and drives the support 123 to oscillate back and forth. Two convex lenses 121 are mounted on the support 123 and are located on opposite sides of the central axis of the oscillating motor 122. Thus, when the oscillating motor 122 operates, it can drive the two convex lenses 121 to oscillate synchronously through the support 123, generating polarized light synchronously, thereby enabling the synchronous formation of an arc-shaped first light spot 30 on both sides of the welding wire. Furthermore, the elimination of the need for two oscillating motors 122 results in a compact structure, enabling miniaturization and reducing costs.

[0036] Specifically, the oscillating motor 122 is positioned at the interval between the two laser output tubes 11. This arrangement of the oscillating motor 122 is reasonable, resulting in a compact overall structure and enabling miniaturized product design.

[0037] Specifically, the support 123 includes two first lens barrels 1231 and a connector 1232. The two first lens barrels 1231 are connected by the connector 1232. The connector 1232 includes, but is not limited to, a connecting rod, a connecting post, or a connecting plate. Each convex lens 121 is correspondingly mounted on each of the first lens barrels 1231. The swing motor 122 is connected to the connector 1232.

[0038] Based on the aforementioned embodiments, the galvanometer assembly 12 further includes a first retaining ring 124. The first retaining ring 124 is installed inside the first lens barrel 1231, and the first retaining ring 124 abuts against the convex lens 121 along the axial direction, so that the convex lens 121 is stably disposed inside the first lens barrel 1231.

[0039] Please see Figure 1 Based on the aforementioned embodiments, the main body 10 of the laser device further includes a dual-path fiber optic output section 13. The dual-path fiber optic output section 13 can respectively transmit two laser beams to two laser output tubes 11. When the laser beam is transmitted in the laser output tube 11, the laser output tube 11 contains a laser crystal, which is excited by an electric current and can release a laser beam containing enormous energy. Furthermore, the laser output tube 11 generates high temperatures; if the heat is not dissipated in time, the laser output performance of the laser output tube 11 will be affected.

[0040] Please see Figure 1 Based on the aforementioned embodiments, the main body 10 of the laser device also includes a cooling mechanism 14. The cooling mechanism 14 is used to cool the laser output tube 11. The cooling mechanism 14 plays a cooling role, which can prevent the temperature of the laser output tube 11 from being too high and affecting the product performance, while reducing the risk of high temperature burns.

[0041] The cooling mechanism 14 employs various cooling methods, including liquid cooling and air cooling. In this embodiment, the cooling mechanism 14 includes a heat dissipation pipe. The heat dissipation pipe is sleeved over the laser output pipe 11, and a cooling liquid flows between the inner wall of the heat dissipation pipe and the outer wall of the laser output pipe 11. The cooling liquid includes, but is not limited to, water. The heat dissipation pipe is equipped with an inlet connector 141 and an outlet connector 142. Optionally, the inlet connector 141 is located at the bottom of the heat dissipation pipe, and the outlet connector 142 is located at the top of the heat dissipation pipe.

[0042] Based on the aforementioned embodiments, the main body 10 of the laser device further includes a first collimating lens (not shown in the figure). The first collimating lens is correspondingly disposed at the output end of the laser output tube 11. In this way, the first collimating lens can play a focusing role, so that the laser beam output from the output end of the laser output tube 11 is focused and collimated. The originally dispersed light is precisely focused into a straight and sharp light path, and then incident on the convex lens 121. Under the precise rhythmic oscillation of the galvanometer assembly 12, the direction and trajectory of the laser beam can be flexibly controlled, so that each first spot 30 can be, for example, in a semi-circular arc shape, and two first spots 30 can cooperate to form a semi-circular or semi-elliptical spot.

[0043] Based on the aforementioned embodiments, the laser device body 10 further includes a focusing assembly 15. Specifically, there are two focusing assemblies 15, each corresponding to a convex lens 121. The focusing assembly 15 is located on the side of the convex lens 121 away from the laser output tube 11. Each focusing assembly 15 includes a second collimating lens 151. The second collimating lens 151 collimates and focuses the laser beam.

[0044] Based on the aforementioned embodiments, the main body 10 of the laser device further includes two protective gas pipes 16. Protective gas, such as nitrogen or carbon dioxide, is introduced into the protective gas pipes 16. An inlet connector 161 is provided at the end of the protective gas pipe 16 closest to the convex lens 121. Gas enters from the end of the protective gas pipe 16 closest to the convex lens 121 and exits from the other end of the protective gas pipe 16. The protective gas pipes 16 are located on the side of the convex lens 121 furthest from the laser output tube 11, and the two protective gas pipes 16 are arranged at an angle. Each protective gas pipe 16 corresponds to the laser output from each convex lens 121, and the laser output from each convex lens 121 enters the corresponding protective gas pipe 16 before being output. Simultaneously with the formation of the molten pool on the workpiece 20 to be welded, the protective gas is activated. The high-speed airflow not only removes the heat generated during welding, preventing overheating and deformation of the workpiece, but also isolates the weld from air, preventing oxidation of the molten pool, allowing the weld to exhibit a dense, strong, and perfect shape during rapid cooling. It not only significantly improves welding efficiency, but also meets the stringent welding quality requirements of high-end fields such as aerospace and precision electronics with millimeter-level precision.

[0045] Please see Figure 2 , Figure 7 and Figure 8 For example, the focusing assembly 15 is mounted on the end of the protective air tube 16 near the convex lens 121. The focusing assembly 15 also includes a second lens barrel 152, a protective lens 153, and a second retaining ring 154. The protective lens 153, the second collimating lens 151, and the second retaining ring 154 are sequentially disposed within the second lens barrel 152.

[0046] Based on the aforementioned embodiments, the laser welding apparatus further includes a welding wire feeding mechanism 60. The welding wire feeding mechanism 60 is connected to the laser device body 10 and is used to output the welding wire. The welding wire is positioned between the two laser beams and passes through the center of the two first laser spots 30. Thus, the welding wire feeding mechanism 60 and the laser device body 10 work together, allowing the welding wire to be precisely fed between the two first laser spots 30. The elliptical laser spot ring surrounds the welding wire, instantly releasing high heat energy, precisely melting the welding wire and the workpiece to obtain a stable and uniform molten pool. This avoids the drawbacks of poor energy matching between the welding wire and the laser in traditional welding processes, as well as the defects of energy accumulation on one side during welding. Therefore, it ensures both the filling effect of the weld and improves the stability of the welding process. With the synergistic effect of the two first light spots 30, the thick plate welding is completed in one go, eliminating the need for repeated rework, greatly shortening the welding time, reducing the intensity of manual operation, ensuring the welding efficiency and quality of the thick plate, reducing welding steps, significantly reducing energy consumption and material waste, and making the weld formation quality more stable, providing more efficient and reliable technical support for high-end equipment manufacturing.

[0047] Specifically, the welding wire feeding mechanism 60 includes a feeding tube 61. The feeding tube 61 is arranged between two laser output tubes 11 and also between two shielding gas tubes 16. The welding wire is output outward through the feeding tube 61. The feeding tube 61 can feed the welding wire to the intersection of the two shielding gas tubes 16, that is, the position of the two first light spots 30 formed by the two laser beams.

[0048] During the welding process of the workpiece 20, the welding wire feeding mechanism 60 gradually outputs the welding wire. Two laser beams provided by the laser device body 10 are focused on both sides of the welding wire to form first light spots 30. The two first light spots 30 completely melt the output welding wire to achieve the welding work. Furthermore, the laser device body 10 and the welding wire feeding mechanism 60 are integrated into one unit, forming a compact structure that can be handheld or held by a robotic arm, facilitating operation. They can move synchronously along the extension direction of the weld, thereby ensuring that all parts of the weld are welded.

[0049] Based on the aforementioned embodiments, the laser welding apparatus also includes a controller (not shown in the figure). Both the main body 10 of the laser apparatus and the wire feeding mechanism 60 are electrically connected to the controller. The controller is used to adjust the wire feeding speed of the wire feeding mechanism 60 according to the laser energy parameters. Thus, based on closed-loop control logic, the wire feeding speed is adjusted in real time according to the laser energy parameters, achieving dynamic matching between the welding wire and laser energy. This completely breaks the limitation of "separation of laser spot and wire feeding" in traditional laser welding apparatuses, allowing seamless connection between wire feeding and laser heating, effectively reducing welding spatter, lowering the weld defect rate, increasing welding efficiency by more than 30%, and achieving weld formation quality that meets high-end manufacturing standards.

[0050] More specifically, the energy density, incident angle, and size of the first spot 30 of each of the two laser beams can be controlled. In practice, by fine-tuning the angle of the two laser beams, the first spot 30 of one laser beam can be focused on the tip of the welding wire, rapidly heating the welding wire to a molten state and ensuring wetting and fusion between the welding wire and the workpiece 20 to be welded; the other laser beam is precisely focused on the weld area, preheating the workpiece 20 and maintaining the molten pool, avoiding workpiece deformation caused by energy concentration. The two laser beams form a gradient energy field, that is, the energy is distributed in a gradient in space, with the energy distribution transitioning orderly from high to low or from low to high, thereby solving the drawbacks of single-spot energy overload and significantly improving the stability of the welding process.

[0051] Therefore, the laser welding device in this embodiment has extremely high adaptability. On the one hand, it achieves bidirectional energy penetration and efficient superposition within the workpiece 20 to be welded, allowing uniform fusion from the center to both sides of the weld seam. This efficiently and completely melts the welding wire and welds it to the workpiece 20, completely solving the problem in related technologies where a single-sided laser spot cannot penetrate thick plates, thus improving welding efficiency and quality. On the other hand, in the welding of new energy vehicle battery modules, the gradient heating mode of the dual laser spots can prevent the thin-walled battery casing from burning through, and the central wire feeding ensures the sealing of the weld seam. Furthermore, in the welding of precision aerospace components, precise energy control and coordinated wire feeding enable high-strength welding of dissimilar metal materials, meeting stringent reliability requirements.

[0052] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0053] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A laser welding apparatus, characterized in that, include: The main body of the laser device can output two laser beams that are set at an angle and are both in a polarized state; each of the two laser beams is focused on the workpiece to be welded and forms a first spot on the workpiece. The first spots formed by the two laser beams are close to each other so that they are on both sides of the same welding wire, thereby melting and welding the welding wire to the workpiece.

2. The laser welding apparatus according to claim 1, characterized in that, The main body of the laser device includes two laser output tubes and a galvanometer assembly; the two laser output tubes are arranged side by side with a gap between them, and the galvanometer assembly includes two convex lenses, each of which is arranged with a gap between itself and the output end of each laser output tube; the second light spot formed by each laser output tube on the surface of each convex lens is located on one side away from the center point of the two convex lenses.

3. The laser welding apparatus according to claim 2, characterized in that, The galvanometer assembly also includes a swing motor and a bracket; the swing motor is connected to the bracket and is used to drive the bracket to swing back and forth; both convex lenses are mounted on the bracket and are located on opposite sides of the central axis of the swing motor.

4. The laser welding apparatus according to claim 3, characterized in that, The swing motor is positioned at the interval between the two laser output tubes; and / or, the bracket includes two first lens barrels and a connector, the two first lens barrels are connected by the connector, each of the convex lenses is correspondingly installed in each of the first lens barrels, and the swing motor is connected to the connector.

5. The laser welding apparatus according to claim 2, characterized in that, The main body of the laser device also includes a first collimating lens, which is correspondingly disposed at the output end of the laser output tube; And / or, the main body of the laser device further includes a cooling mechanism for cooling the laser output tube.

6. The laser welding apparatus according to claim 2, characterized in that, The main body of the laser device also includes a focusing component, which is disposed on the side of the convex lens away from the laser output tube, and the focusing component includes a second collimating lens.

7. The laser welding apparatus according to claim 6, characterized in that, The main body of the laser device also includes two protective air tubes. The protective air tubes are located on the side of the convex lens away from the laser output tube. The two protective air tubes are set at an angle. Each protective air tube is set in correspondence with the laser output from each convex lens. The laser output from each convex lens enters the corresponding protective air tube and is then output.

8. The laser welding apparatus according to claim 7, characterized in that, The focusing assembly is installed at one end of the protective air tube near the convex lens; the focusing assembly also includes a second lens barrel, a protective lens, and a second retaining ring; the protective lens, the second collimating lens, and the second retaining ring are sequentially arranged inside the second lens barrel.

9. The laser welding apparatus according to any one of claims 1 to 8, characterized in that, The laser welding device also includes a welding wire feeding mechanism, which is connected to the main body of the laser device. The welding wire feeding mechanism is used to output the welding wire, and the welding wire is located between the two laser beams.

10. The laser welding apparatus according to claim 9, characterized in that, The laser welding device also includes a controller. The main body of the laser device and the welding wire feeding mechanism are both electrically connected to the controller. The controller is used to adjust the wire feeding speed of the welding wire feeding mechanism according to the laser energy parameters of the welding wire feeding mechanism.

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