Laser welding system and method

Abstract

The invention provides a laser welding system and method, and relates to the technical field of laser welding, the laser welding system comprises a laser head, an electromagnetic coil and a moving seat, the laser head and the moving seat are used for performing synchronous movement in the extending direction of a welding bead on an aluminum alloy workpiece, the electromagnetic coil is arranged on the moving seat, and the moving seat is arranged on the moving seat. And the electromagnetic coil is electrified to generate an alternating magnetic field. Compared with the prior art, the laser welding system has the advantages that on one hand, molten pool fluctuation can be reduced in the aluminum alloy welding process, on the other hand, the molten pool sagging phenomenon in the aluminum alloy workpiece welding process can be improved, and the welding quality and the fusion depth stability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding, and in particular to a laser welding system and method. Background Art

[0002] Laser welding is an efficient and precise welding method that uses a high energy density laser beam as a heat source. High power laser welding technology is widely used in the aerospace, rail vehicle and new energy vehicle manufacturing industries. It has the advantages of fast welding speed, low welding heat input and small welding deformation.

[0003] The existing "conventional high-power laser welding technology" has obvious effects on welding steel plates during the welding process. It has the advantages of fast welding speed, stable welding, and small spatter. The general power is concentrated at around 2kw-3kw. However, the following problems usually occur when the above technology is applied to the welding process of aluminum alloy workpieces: due to the high reflectivity of the aluminum alloy surface oxide layer and aluminum profiles to the laser, laser welding requires a larger energy density, requiring the laser beam spot diameter to be below 0.3mm and the welding power to be around 5kw. Since the laser energy absorption rate of the parent material is between 10% and 30% before the molten pool is formed, a high-energy laser is required to break the surface aluminum oxide. Once the parent material forms a molten pool, the laser absorption rate quickly increases to 85%, which can easily cause the molten pool of the weld to fluctuate. Moreover, the surface tension of liquid aluminum alloy is much lower than that of liquid iron, which causes the molten pool to sag very easily during the aluminum alloy welding process, resulting in back penetration of the weld back of the welded product, especially in the 6-series aluminum alloy back. Welding cracks are prone to occur, resulting in workpiece leakage, a large number of welding and poor airtightness. Summary of the invention

[0004] The problem to be solved by the present invention is: how to reduce the molten pool fluctuation during the aluminum alloy welding process, and how to improve the molten pool sagging phenomenon during the aluminum alloy welding process.

[0005] The present invention provides a laser welding system, comprising: a laser head, an electromagnetic coil and a moving seat, wherein the laser head and the moving seat are used to perform synchronous movement along the extension direction of a weld bead on an aluminum alloy workpiece, the electromagnetic coil is arranged on the moving seat, and the electromagnetic coil is used to be energized to generate an alternating magnetic field.

[0006] Compared with the prior art, the laser welding system provided by the present invention has the following beneficial effects but is not limited to them:

[0007] The laser welding system described in the present invention can install the laser head and the movable seat respectively on, for example, a welding robot, that is, synchronous movement is achieved through the welding robot. Before laser welding the aluminum alloy workpiece, the position of the aluminum alloy workpiece needs to be fixed, for example, by a clamp, and then the laser head and the movable seat are moved to the initial position (one end of the weld on the aluminum alloy workpiece) respectively, wherein the laser head is located above the weld on the aluminum alloy workpiece, the electromagnetic coil is located below the weld, and the axis of the electromagnetic coil is arranged in the vertical direction and does not contact the lower end surface of the aluminum alloy workpiece, that is, there is a gap between the electromagnetic coil and the lower end surface of the aluminum alloy workpiece, and the gap can be 2mm. Before the laser head is turned on to emit a laser beam, the electromagnetic coil is energized to generate an alternating magnetic field, and then the laser head is turned on to emit a laser beam onto the weld. At the same time, the laser head and the movable seat move synchronously along the extension direction of the weld on the aluminum alloy workpiece until the welding is completed. In the above working process, the electromagnetic coil is used as an AC coil, which is used to generate an alternating magnetic field (oscillating magnetic field). The direction of the alternating magnetic field generated by the electromagnetic coil is always upward and perpendicular to the welding path. The alternating magnetic field has a stirring effect on the molten pool, which can improve the fluidity of the weld metal material, thereby reducing the molten pool fluctuation during the aluminum alloy welding process, and the upward Lorentz force generated by the alternating magnetic field will offset the hydrostatic pressure of the molten pool to eliminate the droop effect of the molten pool. In this way, the molten pool is supported by the alternating magnetic field to avoid the problem of penetration. At the same time, the electromagnetic coil can be placed directly below the molten pool in real time through the moving seat to ensure that the welding point can be supported. Compared with the prior art, the laser welding system of the present invention can reduce the molten pool fluctuation during the aluminum alloy welding process on the one hand, and improve the molten pool droop phenomenon during the welding of aluminum alloy workpieces on the other hand, thereby improving the welding quality and the stability of the penetration depth.

[0008] Optionally, the laser welding system further comprises an electromagnetic drive unit, wherein the electromagnetic drive unit is connected to the electromagnetic coil via a wire, wherein the output power and frequency of the electromagnetic drive unit are independently adjustable.

[0009] Optionally, the laser welding system further comprises a wire filling mechanism, which is used to fill metal wire onto the weld bead, and the wire filling mechanism is used to move synchronously with the laser head along the extension direction of the weld bead.

[0010] Optionally, the laser welding system also includes a moving device, and the laser head, the moving seat and the wire filling mechanism are respectively connected to the moving device, and the moving device is used to drive the laser head, the moving seat and the wire filling mechanism to move synchronously along the extension direction of the weld.

[0011] Optionally, the movable seat includes a horizontal plate, a connecting rod and a vertical plate, both ends of the connecting rod are respectively connected to the horizontal plate and the vertical plate, the horizontal plate is used to be arranged below the aluminum alloy workpiece, the electromagnetic coil is arranged on the end surface of the horizontal plate facing the aluminum alloy workpiece, and the vertical plate is detachably connected to the movable device; the extension direction of the connecting rod is perpendicular to the extension direction of the weld, and the end of the connecting rod connected to the vertical plate is used to extend relative to the aluminum alloy workpiece to a position beyond the edge of the aluminum alloy workpiece.

[0012] Optionally, the laser welding system further comprises a linear drive mechanism, wherein the linear drive mechanism comprises a fixed body and a telescopic portion, wherein the telescopic portion is used to telescope relative to the fixed body to drive the movable seat to move.

[0013] Optionally, a sensor is provided on the linear drive mechanism, and the sensor is used to detect the distance of the moving seat relative to the linear drive mechanism. When the sensor detects that the moving seat moves from the first position to the second position, the telescopic part is used to telescope relative to the fixed body to drive the moving seat to reset to the first position.

[0014] Optionally, the laser welding system further comprises a welding fixture, wherein the welding fixture is used to fix the aluminum alloy workpiece, and the movable seat is slidably connected to the welding fixture.

[0015] Optionally, the welding fixture includes a base, a track is provided on the base, and the movable seat is slidably connected to the track, wherein an extension direction of the track is parallel to an extension direction of the weld bead.

[0016] In addition, the present invention also provides a laser welding method, based on the laser welding system as described above, comprising the following steps:

[0017] According to the starting point of the weld bead, the positions of the laser head and the movable base are adjusted so that the electromagnetic coil is located directly below the starting point of the weld bead, and the axis of the electromagnetic coil is arranged in the vertical direction;

[0018] The laser head is started, the electromagnetic coil is energized, and the laser head and the moving seat are controlled to move synchronously from the starting position of the weld bead to the end position of the weld bead.

[0019] Since the technical improvement and technical effect of the laser welding method are the same as those of the laser welding system, the technical effect of the laser welding method will not be described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The structure of the laser welding system according to the embodiment of the present invention is shown in FIG. Figure 1;

[0021] Figure 2 The structure of the laser welding system according to the embodiment of the present invention is shown in FIG. Figure 2 .

[0022] Description of reference numerals:

[0023] 1. Laser head; 2. Electromagnetic coil; 3. Moving seat; 31. Horizontal plate; 32. Connecting rod; 33. Vertical plate; 4. Aluminum alloy workpiece; 41. Welding bead; 5. Electromagnetic drive unit; 6. Wire filling mechanism; 7. Linear drive mechanism; 8. Base. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] In the description of the present invention, the directions or positional relationships indicated by “up”, “down”, “left”, “right”, “top”, “bottom”, “front”, “back”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment" and "one implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0028] Moreover, the Z axis in the drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z axis (that is, the direction of the arrow of the Z axis) represents the top, and the negative direction of the Z axis (that is, the direction opposite to the positive direction of the Z axis) represents the bottom.

[0029] It should also be noted that the aforementioned Z-axis representation is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] like Figures 1 to 2 As shown, the laser welding system of an embodiment of the present invention includes: a laser head 1, an electromagnetic coil 2 and a moving seat 3, the laser head 1 and the moving seat 3 are used to make synchronous movements along the extension direction of the weld bead 41 on the aluminum alloy workpiece 4, the electromagnetic coil 2 is arranged on the moving seat 3, and the electromagnetic coil 2 is used to be energized to generate an alternating magnetic field.

[0031] In this embodiment, combined with the attached Figure 1 and attached Figure 2 As shown, the laser head 1 and the movable base 3 can be respectively installed on, for example, a welding robot, that is, the synchronous movement is achieved by the welding robot. Before laser welding the aluminum alloy workpiece 4, the position of the aluminum alloy workpiece 4 needs to be fixed, for example, by a clamp, and then the laser head 1 and the movable base 3 are respectively moved to the initial position (one end of the weld bead 41 on the aluminum alloy workpiece 4), wherein the laser head 1 is located above the weld bead 41 on the aluminum alloy workpiece 4 (attached Figure 1 The electromagnetic coil 2 is located below the weld bead, and the axis of the electromagnetic coil 2 is arranged in the vertical direction, and does not contact the lower end surface of the aluminum alloy workpiece 4, that is, there is a gap between the electromagnetic coil 2 and the lower end surface of the aluminum alloy workpiece 4, and the gap can be 2mm. Before the laser head 1 is turned on to emit a laser beam, the electromagnetic coil 2 is energized to generate an alternating magnetic field, and then the laser head 1 is turned on to emit a laser beam onto the weld bead 41. At the same time, the laser head 1 and the moving seat 3 move synchronously along the extension direction of the weld bead 41 on the aluminum alloy workpiece 4 until the welding is completed. In the above working process, the electromagnetic coil 2 is used as an AC coil, which is used to generate an alternating magnetic field (oscillating magnetic field). The direction of the alternating magnetic field generated by the electromagnetic coil 2 is always upward (attached Figure 1 The positive direction of the Z axis is perpendicular to the welding path. The alternating magnetic field has a stirring effect on the molten pool, which can improve the fluidity of the weld metal material, thereby reducing the molten pool fluctuation during the aluminum alloy welding process. The upward Lorentz force generated by the alternating magnetic field will offset the hydrostatic pressure of the molten pool to eliminate the drooping effect of the molten pool. In this way, the molten pool is supported by the alternating magnetic field to avoid the problem of penetration. At the same time, the electromagnetic coil 2 can be placed directly below the molten pool in real time through the movable seat 3 to ensure that the welding point can be supported. Compared with the prior art, the laser welding system of the present invention can reduce the molten pool fluctuation during the aluminum alloy welding process on the one hand, and improve the molten pool droop phenomenon during the welding of aluminum alloy workpieces on the other hand, thereby improving the welding quality and the stability of the penetration depth.

[0032] It should be noted that the laser head 1 and the moving base 3 can be installed on a welding robot or any other mechanical device that can achieve synchronous movement. The aluminum alloy workpiece 4 can be a 6 series aluminum alloy.

[0033] Optionally, the laser welding system further comprises an electromagnetic drive unit 5, wherein the electromagnetic drive unit 5 is connected to the electromagnetic coil 2 via a wire, wherein the output power and frequency of the electromagnetic drive unit 5 are independently adjustable.

[0034] In this embodiment, combined with the attached Figure 1 or attached Figure 2 As shown, the electromagnetic drive unit 5 and the electromagnetic coil 2 are electrically connected through a conductive wire, wherein the frequency and power of the electrical signal output by the electromagnetic drive unit 5 are adjustable, and the frequency and power can be optimized and adjusted according to actual process requirements.

[0035] It should be noted that the electromagnetic driving unit 5 can be any type of electromagnetic driving device in the prior art, as long as the frequency and power of the electrical signal outputted by it are adjustable.

[0036] Optionally, the laser welding system further comprises a wire filling mechanism 6 , which is used to fill metal wire onto the weld bead 41 , and the wire filling mechanism 6 is used to move synchronously with the laser head 1 along the extension direction of the weld bead 41 .

[0037] In this embodiment, combined with the attached Figure 1 As shown, the wire filling mechanism 6 is a wire feeder in the prior art, which can be installed on the welding robot and move synchronously with the laser head 1 along the extension direction of the weld bead 41. While the laser head 1 is performing laser welding, the wire filling mechanism 6 fills the weld bead 41 with metal wire. The laser beam emitted by the laser head 1 can melt the metal wire to fill the weld, thereby forming a more uniform and dense weld and improving the welding strength.

[0038] Optionally, the laser welding system also includes a moving device, and the laser head 1, the moving seat 3 and the wire filling mechanism 6 are respectively connected to the moving device, and the moving device is used to drive the laser head 1, the moving seat 3 and the wire filling mechanism 6 to move synchronously along the extension direction of the weld bead 41.

[0039] In this embodiment, the moving device can be a welding robot or any other mechanical equipment that can realize the synchronous movement of the laser head 1, the moving seat 3 and the wire filling mechanism 6. The moving device can simultaneously drive the laser head 1, the moving seat 3 and the wire filling mechanism 6 to move synchronously along the extension direction of the weld bead 41.

[0040] Optionally, the movable seat 3 includes a horizontal plate 31, a connecting rod 32 and a vertical plate 33, the two ends of the connecting rod 32 are respectively connected to the horizontal plate 31 and the vertical plate 33, the horizontal plate 31 is used to be arranged below the aluminum alloy workpiece 4, the electromagnetic coil 2 is arranged on the end surface of the horizontal plate 31 facing the aluminum alloy workpiece 4, and the vertical plate 33 is detachably connected to the movable device; the extension direction of the connecting rod 32 is perpendicular to the extension direction of the weld bead 41, and the end of the connecting rod 32 connected to the vertical plate 33 is used to extend relative to the aluminum alloy workpiece 4 to a position beyond the edge of the aluminum alloy workpiece 4.

[0041] In this embodiment, combined with the attached Figure 1 and attached Figure 2 As shown, the movable seat 3 includes a horizontal plate 31, a connecting rod 32 and a vertical plate 33, wherein the connecting rod 32 can be connected between the horizontal plate 31 and the vertical plate 33 by welding, and the vertical plate 33 is vertically arranged relative to the horizontal plate 31, wherein the vertical plate 33 can be connected to the movable device by bolts, and the horizontal plate 31 is located below the aluminum alloy workpiece 4 (see FIG. Figure 1 The electromagnetic coil 2 is arranged on the horizontal plate 31 facing the end surface of the aluminum alloy workpiece 4, and the electromagnetic coil 2 can be placed directly below the molten pool by moving the seat 3. Figure 2 As shown, the extension direction of the connecting rod 32 is perpendicular to the extension direction of the weld bead 41, and one end of the connecting rod 32 connected to the vertical plate 33 extends to a position beyond the edge of the aluminum alloy workpiece 4, thereby facilitating the connection of the vertical plate 33 with the moving device.

[0042] Optionally, the laser welding system further comprises a linear drive mechanism 7, wherein the linear drive mechanism 7 comprises a fixed body and a telescopic portion, wherein the telescopic portion is used to telescope relative to the fixed body to drive the movable seat 3 to move.

[0043] In this embodiment, combined with the attached Figure 2 As shown, the fixed body of the linear drive mechanism 7 can be installed on the side wall of the welding fixture, and the telescopic part of the linear drive mechanism 7 can be telescopic relative to the fixed body, thereby driving the moving seat 3 to move, and there is no connection relationship between the linear drive mechanism 7 and the moving seat 3. The linear drive mechanism 7 mainly plays a role in resetting the moving seat 3. The linear drive mechanism 7 can be a cylinder.

[0044] Optionally, a sensor is provided on the linear drive mechanism 7, and the sensor is used to detect the distance of the moving seat 3 relative to the linear drive mechanism 7. When the sensor detects that the moving seat 3 moves from the first position to the second position, the telescopic part is used to telescope relative to the fixed body to drive the moving seat 3 to reset to the first position.

[0045] In this embodiment, a sensor is provided on the linear drive mechanism 7. When the sensor detects that the movable seat 3 moves from the first position to the second position, the telescopic part will be telescoped relative to the fixed body to drive the movable seat 3 to reset to the first position, wherein the first position can be one end of the weld bead 41, and the second position can be the other end of the weld bead 41.

[0046] Optionally, the laser welding system further comprises a welding fixture, wherein the welding fixture is used to fix the aluminum alloy workpiece 4, and the movable seat 3 is slidably connected to the welding fixture.

[0047] In this embodiment, the welding fixture can be any mechanical fixture used to fix and support the aluminum alloy workpiece 4, and the movable seat 3 can be slidably connected to the welding fixture to ensure the stability of movement.

[0048] Optionally, the welding fixture includes a base 8 , a track is provided on the base 8 , and the movable seat 3 is slidably connected to the track, wherein an extension direction of the track is parallel to an extension direction of the weld bead 41 .

[0049] In this embodiment, combined with the attached Figure 1 As shown, the welding fixture includes a base 8, wherein a track is arranged on the base 8, and the extension direction of the track is parallel to the extension direction of the weld bead 41, and the movable seat 3 can be slidably connected to the track.

[0050] In addition, the present invention also provides a laser welding method, based on the laser welding system as described above, comprising the following steps:

[0051] According to the starting point of the weld bead 41, the positions of the laser head 1 and the movable base 3 are adjusted so that the electromagnetic coil 2 is located directly below the starting point of the weld bead 41, and the axis of the electromagnetic coil 2 is arranged in the vertical direction;

[0052] The laser head 1 is started, the electromagnetic coil 2 is energized, and the laser head 1 and the moving base 3 are controlled to move synchronously from the starting position of the weld bead 41 to the end position of the weld bead 41 .

[0053] In this embodiment, combined with the attached Figure 1 and attached Figure 2 As shown, the laser head 1 and the moving seat 3 can be respectively installed on, for example, a welding robot, that is, the synchronous movement is achieved by the welding robot. Before laser welding the aluminum alloy workpiece 4, the position of the aluminum alloy workpiece 4 needs to be fixed, for example, by a clamp, and then the laser head 1 and the moving seat 3 are respectively moved to the starting position of the weld bead 41 (one end of the weld bead 41 on the aluminum alloy workpiece 4), wherein the laser head 1 is located above the weld bead 41 on the aluminum alloy workpiece 4 (attached Figure 1The electromagnetic coil 2 is located below the weld bead, and the axis of the electromagnetic coil 2 is arranged in the vertical direction and does not contact the lower end surface of the aluminum alloy workpiece 4, that is, there is a gap between the electromagnetic coil 2 and the lower end surface of the aluminum alloy workpiece 4, and the gap can be 2 mm. Before the laser head 1 is turned on to emit a laser beam, the electromagnetic coil 2 is energized to generate an alternating magnetic field, and then the laser head 1 is turned on to emit a laser beam onto the weld bead 41. At the same time, the laser head 1 and the moving seat 3 are controlled to move synchronously from the starting position of the weld bead 41 to the end position of the weld bead 41 until the welding is completed.

[0054] Since the technical improvement and technical effect of the laser welding method are the same as those of the laser welding system, the technical effect of the laser welding method will not be described in detail.

[0055] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A laser welding system, characterized in that: include: A laser head (1), an electromagnetic coil (2) and a moving seat (3), wherein the laser head (1) and the moving seat (3) are used to perform synchronous movement along the extension direction of a weld bead (41) on an aluminum alloy workpiece (4), the electromagnetic coil (2) is arranged on the moving seat (3), and the electromagnetic coil (2) is used to generate an alternating magnetic field when energized.

2. The laser welding system according to claim 1, characterized in that: The laser welding system further comprises an electromagnetic drive unit (5), wherein the electromagnetic drive unit (5) is connected to the electromagnetic coil (2) via a wire, wherein the output power and frequency of the electromagnetic drive unit (5) are independently adjustable.

3. The laser welding system according to claim 1, characterized in that: The laser welding system further comprises a wire filling mechanism (6), wherein the wire filling mechanism (6) is used to fill metal wire onto the weld bead (41), and the wire filling mechanism (6) is used to move synchronously with the laser head (1) along the extension direction of the weld bead (41).

4. The laser welding system according to claim 3, characterized in that: The laser welding system further comprises a moving device, the laser head (1), the moving seat (3) and the wire filling mechanism (6) are respectively connected to the moving device, and the moving device is used to drive the laser head (1), the moving seat (3) and the wire filling mechanism (6) to perform synchronous movement along the extension direction of the weld bead (41).

5. The laser welding system according to claim 4, characterized in that: The movable seat (3) comprises a horizontal plate (31), a connecting rod (32) and a vertical plate (33), the two ends of the connecting rod (32) are respectively connected to the horizontal plate (31) and the vertical plate (33), the horizontal plate (31) is used to be arranged below the aluminum alloy workpiece (4), the electromagnetic coil (2) is arranged on the end surface of the horizontal plate (31) facing the aluminum alloy workpiece (4), and the vertical plate (33) is detachably connected to the movable device; the extension direction of the connecting rod (32) is perpendicular to the extension direction of the weld bead (41), and the end of the connecting rod (32) connected to the vertical plate (33) is used to extend relative to the aluminum alloy workpiece (4) to a position beyond the edge of the aluminum alloy workpiece (4).

6. The laser welding system according to claim 1, characterized in that: The laser welding system further comprises a linear drive mechanism (7), wherein the linear drive mechanism (7) comprises a fixed body and a telescopic portion, wherein the telescopic portion is used to telescope relative to the fixed body to drive the movable seat (3) to move.

7. The laser welding system according to claim 6, characterized in that: The linear drive mechanism (7) is provided with a sensor, and the sensor is used to detect the distance of the movable seat (3) relative to the linear drive mechanism (7). When the sensor detects that the movable seat (3) moves from a first position to a second position, the telescopic portion is used to telescope relative to the fixed body to drive the movable seat (3) to return to the first position.

8. The laser welding system according to claim 1, characterized in that: The laser welding system also includes a welding fixture, which is used to fix the aluminum alloy workpiece (4), and the movable seat (3) is slidably connected to the welding fixture.

9. The laser welding system according to claim 8, characterized in that: The welding fixture comprises a base (8), a track is arranged on the base (8), and the movable seat (3) is slidably connected to the track, wherein the extension direction of the track is parallel to the extension direction of the weld bead (41).

10. A laser welding method, characterized in that: The laser welding system according to any one of claims 1 to 9 comprises the following steps: According to the starting point of the weld bead (41), the positions of the laser head (1) and the movable seat (3) are adjusted so that the electromagnetic coil (2) is located directly below the starting point of the weld bead (41), and the axis of the electromagnetic coil (2) is arranged in the vertical direction; The laser head (1) is started, the electromagnetic coil (2) is energized, and the laser head (1) and the moving seat (3) are controlled to move synchronously from the starting position of the weld bead (41) to the end position of the weld bead (41).

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