Laser welding method and laser welding equipment for plates

Abstract

The invention provides a laser welding method and laser welding equipment for plates. The method comprises the steps that a welding unit is controlled to conduct laser welding along a first track; the first track is roughly in an Archimedes spiral shape; the starting point of the first track deviates from the center of the first track; the curvature radius of the starting point of the first track is larger than the spot radius of the laser. The laser welding method and the laser welding equipment for the plate can reduce the continuous staying time of the laser in the center position of the first track, and reduce the risk that the plate is welded through.

Description

Technical Field

[0001] The present application relates to the field of laser welding, and specifically to a laser welding method and laser welding equipment for plates. Background Art

[0002] At present, with the development of laser welding technology, it is widely used due to its high efficiency and high precision, such as plate welding. However, when welding stacked plates by laser welding, the plate is easily welded through. Summary of the Invention

[0003] Multiple embodiments of the present application provide a laser welding method and laser welding equipment for a plate, which can reduce the risk of the plate being welded through.

[0004] In a first aspect, an embodiment of the present application provides a laser welding method for a plate, the method comprising: controlling a welding unit to perform laser welding along a first trajectory; the first trajectory is roughly in the shape of an Archimedean spiral; the starting point of the first trajectory deviates from the center of the first trajectory; the curvature radius of the starting point of the first trajectory is greater than the spot radius of the laser.

[0005] Optionally, in the first track, at least a partial area corresponds to at least two layers of spirals, and the repetition rate of the laser spot at two adjacent spirals falls within the range of 10% to 20%.

[0006] Optionally, the laser spot during welding includes a core spot and a ring spot surrounding the core spot, and the ring power of the ring spot is greater than the core power of the core spot.

[0007] Optionally, the plates to be welded include stacked upper and lower plates; the upper and lower plates are both aluminum-silicon coated hot-formed steel plates; the thickness of the upper plate falls within the range of 1.2 mm to 2 mm, and the thickness of the lower plate falls within the range of 1.2 mm to 2 mm; the core power of the core spot of the laser falls within the range of 1750 W to 1900 W; and the ring power of the ring spot falls within the range of 6250 W to 6800 W.

[0008] Optionally, when laser welding is performed along the first trajectory, the welding speed falls within the range of 140 mm / s to 145 mm / s.

[0009] Optionally, during welding, a first airflow is provided; the first airflow surrounds the laser and flows in a spiral shape; the axis of the first airflow is collinear with the axis of the laser, and the extension direction of the first airflow points to the welding position.

[0010] Optionally, for each welding point, the welding unit is controlled to perform laser welding at least twice along the first track.

[0011] Optionally, the method further includes: controlling the welding unit to perform laser welding along a second track; the second track is roughly annular and is roughly located between two adjacent spirals in the first track.

[0012] In a second aspect, the present application also provides a laser welding device, comprising: a welding unit; and a control unit, which is communicatively connected to the welding unit; the control unit is configured to execute a laser welding program to implement the aforementioned laser welding method.

[0013] Optionally, the laser welding equipment further includes: a coaxial blowing mechanism for providing the first airflow.

[0014] In multiple embodiments provided by the present application, the starting point of the first trajectory deviates from the center of the first trajectory; the curvature radius of the starting point of the first trajectory is greater than the spot radius of the laser, so as to reduce the time that the laser stays at the center position of the first trajectory and reduce the risk of welding through the plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A flow chart of a laser welding method for a plate provided in one embodiment of the present application.

[0016] Figure 2 for Figure 1 Schematic diagram of a welding trajectory in the method shown.

[0017] Figure 3 for Figure 2 Schematic diagram of the structure of the stacked plates from another perspective.

[0018] Figure 4 A flow chart of a laser welding method for a plate provided in another embodiment of the present application.

[0019] Figure 5 for Figure 4 Schematic diagram of a welding trajectory in the method shown.

[0020] Figure 6a This is a schematic structural diagram of the stacked plates after welding in Example 1.

[0021] Figure 6b for Figure 6a A cross-sectional view of the structure shown passing through points A and B.

[0022] Figure 6c for Figure 6a A cross-sectional view of the structure shown passing through points C and D.

[0023] Figure 7a Schematic diagram of the structure for strength testing of stacked plates after welding.

[0024] Figure 7b7a is a schematic diagram of the structure of the plate after the strength test.

[0025] Figure 7c for Figure 7a Test structure for strength test shown.

[0026] Figure 8a This is a schematic diagram of the structure after welding the B-pillar of the car side using the welding method provided by this application.

[0027] Figure 8b For Figure 8a Schematic diagram of the structure for quasi-static collision test.

[0028] Figure 8c for Figure 8b The test results of the quasi-static collision test are shown.

[0029] Figure 9 This is a schematic structural diagram of the laser welding equipment provided in one embodiment of the present application.

[0030] Figure 10 for Figure 9 Schematic diagram of the structure of the coaxial blowing mechanism.

[0031] Figure 11 for Figure 10 A cross-sectional view of the coaxial blowing mechanism shown.

[0032] Figure 12 for Figure 11 A partial enlarged view of middle A.

[0033] Description of Reference Numerals

[0034] 110 , upper plate; 120 , lower plate; 130 , first track; 140 , second track; 210 , welding unit; 220 , coaxial air blowing mechanism; 230 , laser beam; 221 , air outlet. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0036] In this application, the drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show details of the local features.

[0037] Unless otherwise indicated, all technical and scientific terms used in this application have the same meaning as those generally understood by those skilled in the art in the technical field of this application. The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit the scope of this application. The term "and / or" used in this application includes any and all combinations of one or more related listed items. The singular forms "a", "above", and "the" used in this application and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise.

[0038] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined. In the description of this application, "several" means one or more, unless otherwise clearly and specifically defined.

[0039] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of a simplified description of this application, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation to this application.

[0040] In the description of this application, unless otherwise expressly defined, the terms "installed," "connected," "connect," "fixed," and "disposed" should be understood broadly. For example, "connection" can mean fixed, removable, or integrated; it can mean mechanical or electrical; it can mean direct or indirect connection through an intermediary; it can also mean internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0041] In the description of this application, unless otherwise explicitly defined, a first feature being “on,” “above,” “above,” “above,” “below,” “below,” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Moreover, a first feature being “on,” “above,” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. A first feature being “below,” “below,” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0042] Researchers discovered that traditional spot welding, often used to secure stacked sheets, often uses an Archimedean spiral-shaped weld path to improve weld strength. However, this method causes the laser to remain in the center of the weld path for an extended period of time, resulting in weld penetration.

[0043] Based on this, researchers have developed a laser welding method for sheet metal. This method still uses a roughly Archimedean spiral welding trajectory, but the welding starting point is offset from the trajectory center, and the curvature radius of the welding starting point is larger than the laser spot radius. This method deviates from the center of the welding trajectory during welding, preventing the laser from dwelling for extended periods at the center of the welding trajectory, thereby reducing the risk of weld penetration.

[0044] See also Figures 1 to 3 An embodiment of the present application provides a laser welding method for a plate, a laser welding method for a plate, the method comprising:

[0045] S01. Control the welding unit to perform laser welding along a first trajectory 130; the first trajectory 130 is roughly in the shape of an Archimedean spiral; the starting point of the first trajectory 130 deviates from the center of the first trajectory 130; the curvature radius of the starting point of the first trajectory 130 is greater than the spot radius of the laser.

[0046] It is understood that the first trajectory 130 refers to the trajectory of the laser spot during laser welding, and more specifically, refers to the trajectory of the center of the laser spot.

[0047] In the above method, the starting point of the first trajectory 130 deviates from the center of the first trajectory 130; the curvature radius of the starting point of the first trajectory 130 is greater than the spot radius of the laser, so as to reduce the time that the laser stays at the center position of the first trajectory 130 and reduce the risk of the plate being welded through.

[0048] In the above method, the first trajectory 130 still roughly forms an Archimedean spiral, thus maintaining good welding strength. It should be understood that the first trajectory 130 roughly forms an Archimedean spiral when the curvature radius of the first trajectory 130 gradually increases with increasing polar angle. At certain locations along the first trajectory 130, the curvature radius may remain constant or even decrease slightly with increasing polar angle.

[0049] It is understood that in the first trajectory 130, the number of revolutions of the Archimedean spiral is approximately two. It is understood that in other embodiments, the number of revolutions of the Archimedean spiral is not limited to two, but may be one or more than two. Of course, it is understood that the number of revolutions of the Archimedean spiral may be an integer multiple of one revolution, or a non-integer multiple of one revolution.

[0050] Also, see Figure 2 In this embodiment, the end of the first track 130 is tilted inward to connect with the spiral located inside the first track 130 to increase the strength of the end welding. Of course, in other embodiments, the end of the first track 130 may not be tilted inward, or may be tilted inward but not connect with the spiral located inside the end.

[0051] It can be understood that the first track 130 is roughly in the shape of an Archimedean spiral, which means that at the end of the first track 130 , there may be a sudden change in the inner diameter variation pattern.

[0052] In some embodiments, at least a portion of the first trajectory 130 corresponds to at least two spiral layers, and the laser spot partially overlaps between adjacent spirals. Specifically, when the laser spot passes through the outer spiral's spot on two adjacent spirals in the first trajectory 130, it partially overlaps with the weld area of ​​the adjacent inner spiral, improving weld security. Furthermore, while the laser spot partially overlaps with the weld area of ​​the inner spiral when passing through the outer spiral, the overlapping area gradually shifts as the spot moves, preventing it from remaining in one position. Consequently, the risk of weld penetration is reduced.

[0053] Optionally, the repetition rate of the laser spot between two adjacent spirals falls within the range of 10% to 20%. While the welding areas corresponding to the two spiral circles overlap and the welding strength between the two spiral circles is improved, the overall area of ​​the welding spot can also be made larger to improve the welding strength and improve the welding efficiency.

[0054] In some embodiments, the laser spot during welding comprises a core spot and a ring spot surrounding the core spot, with the ring power of the ring spot being greater than the core power of the core spot. The higher ring power of the ring spot and the lower core power of the core spot create a relatively stable melt at the weld edge, reducing instability at the weld edge caused by convection within the molten pool and preventing the risk of weld penetration due to localized overheating. Furthermore, the higher ring power of the ring spot can increase the weld width, improving weld width and weld precision.

[0055] Furthermore, some plates to be welded are coated. During welding, metal from the coating can easily mix into the weld area, causing segregation in certain areas. This can lead to a high concentration of the coating material in certain areas, compromising weld strength. In this embodiment, the use of a ring spot increases the width of the molten pool, dispersing the coating material that is interspersed in the weld area and reducing segregation. Therefore, removing the coating from the plate surface before welding is unnecessary, simplifying the process, improving efficiency, and reducing costs.

[0056] It can be understood that, in this application, ring power refers to the power of the ring light spot; core power refers to the power of the core light spot.

[0057] In some embodiments, the plates to be welded include a stacked upper plate 110 and a lower plate 120; both the upper plate 110 and the lower plate 120 are aluminum-silicon (Al-Si) coated hot-formed steel plates; the thickness h1 of the upper plate 110 is within a range of 1.2 mm to 2 mm, and the thickness h2 of the lower plate 120 is within a range of 1.2 mm to 2 mm; the core power of the laser's core spot is within a range of 1750 W to 1900 W, and the ring power of the ring spot is within a range of 6250 W to 6800 W. This allows for better control of weld penetration and width. Specifically, on the one hand, the core power is less than or equal to 1900W, which reduces the risk of welding through due to excessively high laser core spot temperature; on the other hand, the core power is greater than 1750W, which reduces the risk of loose welding due to excessively low laser core spot temperature; on the other hand, the ring power is greater than or equal to 6250W, and the ring power forms a relatively stable thermal field around the molten pool, reducing the fluctuation of the molten pool, enhancing the stability of the molten pool, making the molten pool shape more regular, and improving the aesthetics of the welding; on the other hand, the ring power falls within the range of 6250W to 6800W, which helps to increase the welding speed, reduce the residence time of the laser spot in one position, and reduce the risk of welding through.

[0058] Optionally, when laser welding is performed along the first trajectory 130, the welding speed falls within the range of 140 mm / s to 145 mm / s. On the one hand, a welding speed greater than or equal to 140 mm / s can prevent the risk of plate deformation caused by excessive heat accumulation and reduce the risk of weld penetration; on the other hand, it can balance the heat transfer rate between the upper plate 110 and the lower plate 120, improve welding stability, improve welding quality, make the molten core size of each weld similar, improve the welding strength of different welds, and improve the consistency of welding strength at different positions of the plate; on the other hand, the welding speed is greater than or equal to 140 mm / s to have a higher welding speed, that is, in the same time, more welds can be welded, improving work efficiency; on the other hand, the welding speed is less than or equal to 145 mm / s, reducing the risk of gas inside the welding position being unable to be discharged and improving welding quality.

[0059] In some embodiments, during welding, a first airflow is provided; the first airflow surrounds the laser and flows in a spiral pattern; the axis of the first airflow is collinear with the axis of the laser, and the direction of the first airflow is directed toward the weld location. On one hand, the spiral first airflow effectively isolates the weld area from the surrounding air. During the welding process, gases such as oxygen and nitrogen in the air may react with the molten metal, causing defects such as weld oxidation and nitridation, which can affect weld quality. The spiral first airflow prevents air from entering the weld area, reducing the occurrence of oxidation reactions and improving weld quality. Furthermore, the welding process does not require constant direction adjustment, reducing the impact of direction adjustment accuracy and other issues on weld quality. Furthermore, the axis of the first airflow is collinear with the axis of the laser and its direction is directed toward the weld location, which helps enhance the transfer of laser energy. The flow of the first airflow can constrain the laser to a certain extent, providing guidance for the laser beam, allowing the laser energy to be more efficiently absorbed by the weld material, resulting in a more concentrated laser effect at the weld location and improving welding efficiency. Furthermore, the provision of the first airflow can suppress splashing of melted material in the weld area, reducing the impact on non-weld areas of the sheet, and ensuring a stronger weld in the weld area.

[0060] In some embodiments, for each welding point, the welding unit is controlled to perform laser welding along the first track 130 at least twice to improve the strength of the welding.

[0061] See also Figure 4 and Figure 5 In some embodiments, the method further comprises:

[0062] S02 , controlling the welding unit to perform laser welding along the second track 140 ; ​​the second track 140 is substantially annular and is substantially located between two adjacent spirals in the first track 130 .

[0063] The configuration of step S02 can further enhance the welding strength and improve the welding stability.

[0064] Optionally, in step S02, the spacing between the second track 140 and two adjacent spiral circles is equal, so that the repetition rate of the laser spot in the second track 140 and the laser spot at two adjacent spiral circles is the same as the repetition rate of the laser spot in the second track 140 and the laser spot at another two adjacent spiral circles, so as to improve the consistency of the welding strength of the welds at different positions.

[0065] Optionally, step S02 is performed after step S01. It is understandable that in some other embodiments, step S02 may also be performed before step S01, or, when step S01 is performed at least twice, step S02 is performed between two adjacent steps S01.

[0066] Optionally, in step S01, the number of turns of the spiral in the first trajectory 130 is approximately two, and in step S02, the number of the second trajectory 140 is one. It is understandable that, in some other embodiments, the number of turns of the spiral in the first trajectory 130 is not limited to two, and may be more than two. When the number of turns of the spiral in the first trajectory 130 is more than two, a second trajectory 140 is provided between at least some adjacent spirals. When there are multiple second trajectories 140 with different radii, each second trajectory 140 corresponds to a step 2. It is understandable that multiple steps 2 can be executed sequentially, or some can be executed before step S01 and some can be executed after step S01. Alternatively, when step S01 is executed at least twice, some steps 2 can be executed between two adjacent steps S01.

[0067] The following specific experiments illustrate the beneficial effects of the method provided in this application.

[0068] Specifically, the experiment provides Example 1. The upper plate 110 to be welded is an aluminum-silicon (Al-Si) coated hot-formed steel plate with a thickness h1 of 1.2 mm, and the lower plate 120 is an aluminum-silicon (Al-Si) coated hot-formed steel plate with a thickness h2 of 1.8 mm. The maximum diameter of the first track 130 is 7 mm. The core spot diameter is 100 μm, and the ring spot diameter is 290 μm. The core power is 1750 W, the ring power is 6250 W, the welding speed is 145 mm / s, and the defocus is 3 mm.

[0069] According to the method provided by this application, first perform step S01, then perform step S02. Figures 6a to 6cThe weld depths at point A are 1.00mm, 1.10mm, 1.07mm, and 0.62mm, respectively. "Penetration" refers to the depth of the weld located at the lower plate. The weld depths at points A, B, C, and D are all greater than 0.3*h², or 0.54mm, meeting metallographic requirements. The weld depths at points A, B, C, and D are all less than h², indicating no penetration.

[0070] See also Figures 7a to 7c , the strength test of the welding point in Example 1 is carried out. Specifically, a tensile test is used for testing. As the distance between the upper plate 110 and the lower plate 120 is increased, the required tensile force gradually increases until the welding point between the upper plate 110 and the lower plate 120 is broken. Figure 7b As shown in the figure, the tension drops sharply. The direction of the tension is perpendicular to the upper plate 110 and the lower plate 120. Figure 7a In the direction indicated by the arrow. At the same time, a strength test of Example 2 welded by resistance spot welding is also added as a comparative example for comparison. It can be understood that the difference between Example 2 and Example 1 is only the difference in welding method. Figure 7c It can be seen that the red curve is the tensile curve of Example 1, and the black curve is the tensile curve of Example 2. By comparison, it can be seen that the tensile force required to break the weld of Example 1 is greater, so the welding strength of Example 1 is also greater.

[0071] See also Figure 8a , is the application of the welding method provided by this application in practical application scenarios. Specifically, it is to weld the B-pillar of the side of the car. Specifically, Figure 8a The points in the figure are all welding points 01. The B-pillar of the car side is welded through multiple welding points 01. It can be understood that the B-pillar of the car side, also known as the center pillar, is a vertical support pillar located between the front door and the rear door in the car side structure.

[0072] In order to verify the strength of welding, Figure 8a The B-pillar of the car side after welding is subjected to quasi-static collision test and quasi-static collision simulation test. Figure 8b, using the breaking piece 02 to collide with the B-pillar of the car side, so that the B-pillar of the car side is bent and deformed. Specifically, the two ends of the B-pillar of the car side are fixed, and the breaking piece 02 is used to impact the middle position of the B-pillar of the car side. It can be understood that as the elastic deformation of the B-pillar of the car side increases, the impact force between the breaking piece 02 and the B-pillar of the car side becomes greater; when the deformation of the B-pillar of the car side reaches the yield point, that is, when the deformation of the B-pillar of the car side is about to turn into plastic deformation, the impact force is the largest; as the deformation of the B-pillar of the car side continues to increase, the required impact force decreases; as the plastic deformation continues to increase, the required impact force remains roughly stable, increasing or decreasing.

[0073] See also Figure 8c , which shows the experimental results of two quasi-static collision tests and a quasi-static collision simulation test. The horizontal axis represents the displacement of the center of gravity of the vehicle's side B-pillar upon impact, which can be used to characterize the deformation of the vehicle's side B-pillar. As can be seen from the figure, the experimental results of both the two quasi-static collision tests and the quasi-static collision simulation test meet the aforementioned collision law. Furthermore, before reaching the yield point, the impact force was approximately 32.7843 kN, meeting the strength requirements for the vehicle's side B-pillar.

[0074] See also Figures 9 to 12 A laser welding device provided in one embodiment of the present application includes a welding unit 210 and a control unit. The control unit is in communication with the welding unit 210; the control unit is configured to execute a laser welding program to implement the laser welding method provided in the present application.

[0075] By using the above-mentioned laser welding equipment and the laser welding method provided in this application for laser welding, the starting point of the first track 130 deviates from the center of the first track 130; the curvature radius of the starting point of the first track 130 is greater than the spot radius of the laser, so as to reduce the time that the laser stays at the center position of the first track 130 and reduce the risk of the plate being welded through.

[0076] It is understandable that the communication connection between the control unit and the welding unit can be a wired communication connection or a wireless communication connection.

[0077] It is understandable that Figure 9 The middle dotted line is the laser beam 230, which is not part of the structure of the laser welding equipment itself, but is generated during laser welding.

[0078] In this embodiment, the laser welding apparatus further includes a coaxial air blowing mechanism 220. The coaxial air blowing mechanism 220 is configured to provide the first airflow. The coaxial air blowing mechanism 220 is fixedly mounted on the welding unit 210. During use, the coaxial air blowing mechanism 220 does not need to be adjusted, which reduces operational difficulty and better ensures that the first airflow provided by the coaxial air blowing mechanism 220 is coaxial with the laser beam 230.

[0079] In this embodiment, the air outlet 221 of the coaxial blowing mechanism 220 is located at the bottom side of the coaxial blowing mechanism 220 and is annular, so that the first airflow can be evenly arranged around the laser beam 230, so that the welding quality at different positions is more uniform.

[0080] It is understandable that the air outlet 221 is tilted inward relative to the axis of the laser beam 230 so that the first airflow is arranged closer to the laser beam, thereby improving the quality of welding.

[0081] It can be understood that in the various embodiments of the present application, the size of the serial number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0082] It can be understood that the various implementation methods described in this application can be implemented individually or in combination, and the embodiments of this application are not limited to this.

[0083] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems, devices and units can refer to the corresponding processes in the aforementioned method implementation methods and will not be repeated here.

[0084] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A laser welding method for a plate, characterized in that: The method comprises: The welding unit is controlled to perform laser welding along a first track; the first track is roughly in the shape of an Archimedean spiral; the starting point of the first track deviates from the center of the first track; and the curvature radius of the starting point of the first track is greater than the spot radius of the laser.

2. The method according to claim 1, characterized in that In the first track, at least a partial area corresponds to at least two layers of spirals, and a repetition rate of the laser spot at two adjacent spirals falls within a range of 10% to 20%.

3. The method according to claim 1, characterized in that The laser spot during welding includes a core spot and a ring spot surrounding the core spot, and the ring power of the ring spot is greater than the core power of the core spot.

4. The method according to claim 3, characterized in that The plates to be welded include a stacked upper plate and a lower plate; both the upper plate and the lower plate are aluminum-silicon coated hot-formed steel plates; the thickness of the upper plate falls within the range of 1.2 mm to 2 mm, and the thickness of the lower plate falls within the range of 1.2 mm to 2 mm; the core power of the core spot of the laser falls within the range of 1750 W to 1900 W; and the ring power of the ring spot falls within the range of 6250 W to 6800 W.

5. The method according to claim 4, characterized in that When laser welding is performed along the first trajectory, the welding speed falls within the range of 140 mm / s to 145 mm / s.

6. The method according to any one of claims 1 to 5, characterized in that During welding, a first airflow is provided; the first airflow surrounds the laser and flows in a spiral shape; the axis of the first airflow is collinear with the axis of the laser, and the extension direction of the first airflow points to the welding position.

7. The method according to any one of claims 1 to 5, characterized in that For each welding point, the welding unit is controlled to perform laser welding at least twice along the first track.

8. The method according to any one of claims 1 to 5, characterized in that The method further comprises: The welding unit is controlled to perform laser welding along a second track; the second track is substantially annular and is substantially located between two adjacent spirals in the first track.

9. A laser welding device, characterized in that: include: Welding unit; as well as A control unit is communicatively connected to the welding unit; the control unit is configured to execute a laser welding program to implement the laser welding method according to any one of claims 1 to 8.

10. The laser welding equipment according to claim 9, characterized in that The laser welding equipment also includes: The coaxial air blowing mechanism is used to provide the first airflow.

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