Thick plate laser welding system

Abstract

The utility model relates to a thick plate laser welding system which comprises a welding laser assembly, a detection laser emitting assembly and a detection laser receiving assembly, the detection laser emitting assembly and the detection laser receiving assembly are arranged on the two sides of the welding laser assembly, and the welding laser assembly provides focused welding laser for a workpiece to be welded and conducts welding on the workpiece to be welded. The detection laser emitting assembly comprises a detection laser emitter, the detection laser receiving assembly comprises a detection laser reference receiver and a detection laser adjusting receiver arranged on the side portion of the detection laser reference receiver, and when the detection laser reference receiver receives detection laser emitted by the detection laser emitter, the detection laser adjusting receiver adjusts the detection laser. Focused welding laser provided by the welding laser assembly is perpendicular to the workpiece to be welded. The alignment angle of the welding laser and the workpiece is determined by detecting the reflection angle of the laser, then the deflection of the welding system is adjusted, accurate alignment of the welding laser and the workpiece in thick plate laser welding is achieved, and the welding quality and the production efficiency of the workpiece are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser welding, in particular to a laser welding system for thick plates. Background Art

[0002] Laser welding has the characteristics of deep welding depth and high welding efficiency. With the gradual maturity of the commercialization of high-power lasers, it is expected to achieve laser welding of ultra-thick plates with a thickness of more than 10 mm or even 20 - 50 mm. Due to the increasing demand for thick plate welding currently, high-quality thick plate welding is also a technical problem that needs to be solved urgently. An important technical difficulty in thick plate welding is the alignment problem in laser welding. In current laser welding, only the position of the indicating light in the welding laser on the workpiece surface can be observed, and it is impossible to observe whether the laser is perpendicular to the workpiece. The perpendicularity of the welding laser to the workpiece can only be judged by the experience of technicians and cannot be accurately measured. In thick plate welding, due to the relatively thick workpiece thickness, a small-angle inclination will also cause a large laser deviation. The deviation of the welding laser will cause the laser to be unable to penetrate the workpiece, resulting in laser virtual welding and affecting the welding strength and quality. At the same time, the smoke of the workpiece that is not penetrated by the laser can only be discharged upward, and a large amount of upwardly discharged smoke will also damage the laser welding system, causing the burning of the protective mirror, etc. Summary of the Utility Model

[0003] Aiming at the deficiencies of the background art, on the one hand, the utility model provides a laser welding system for thick plates. The system includes a welding laser assembly, a detection laser emission assembly, and a detection laser reception assembly. The detection laser emission assembly and the detection laser reception assembly are respectively arranged on both sides of the welding laser assembly.

[0004] The welding laser assembly is used to provide a focused welding laser to the workpiece to be welded for welding the workpiece to be welded.

[0005] The detection laser emission assembly includes a detection laser emitter. The detection laser reception assembly includes a detection laser reference receiver and at least one detection laser adjustment receiver arranged on the side of the detection laser reference receiver. When the detection laser reference receiver receives the detection laser emitted by the detection laser emitter, the focused welding laser provided by the welding laser assembly is perpendicular to the workpiece to be welded.

[0006] The welding system is used to deflect from the current position towards the direction of the detection laser target adjustment receiver when the detection laser target adjustment receiver receives the detection laser emitted by the detection laser emitter. The detection laser target adjustment receiver is one of the at least one detection laser adjustment receiver. During the deflection process of the welding system, the welding laser assembly stops emitting the focused welding laser.

[0007] Further, there are multiple detection laser adjustment receivers, and the multiple detection laser adjustment receivers are distributed on both sides of the detection laser reference receiver.

[0008] Further, the detection laser emitting assembly includes a detection laser reference emitter and at least one detection laser adjustment emitter disposed on the side of the detection laser reference emitter. The detection laser receiving assembly includes one detection laser receiver. When the detection laser emitted by the detection laser reference emitter is received by the detection laser receiver, the focused welding laser provided by the welding laser assembly is perpendicular to the workpiece to be welded; the detection laser reference emitter and the detection laser adjustment emitter emit lasers in sequence.

[0009] When the detection laser emitted by the detection laser target adjustment emitter is received by the detection laser receiver, the welding system deflects from the current position towards the direction of the detection laser target adjustment emitter until the detection laser emitted by the detection laser reference emitter is received by the detection laser receiver. The detection laser target adjustment emitter is one of the at least one detection laser adjustment emitter. During the deflection process of the welding system, the welding laser assembly stops emitting the focused welding laser.

[0010] Further, there are multiple detection laser adjustment emitters, and the multiple detection laser adjustment emitters are distributed on both sides of the detection laser reference emitter.

[0011] Further, the welding laser assembly includes a welding laser output head, a collimating mirror, and a focusing mirror. The collimating mirror is located between the welding laser output head and the focusing mirror. The welding laser output head emits welding laser, which is collimated by the collimating mirror to form collimated welding laser. The focusing mirror is used to focus the collimated welding laser to form a focused welding laser and then emit it onto the workpiece to be welded.

[0012] Further, the welding laser assembly further includes a collimator spherical aberration compensation lens, a focusing lens spherical aberration compensation lens, and a protective mirror. The collimator and the focusing lens are biconvex lenses. The collimator spherical aberration compensation lens and the focusing lens spherical aberration compensation lens are plano-concave lenses. The collimator spherical aberration compensation lens is disposed between the collimator and the focusing lens. The concave side of the collimator spherical aberration compensation lens is attached to the first convex surface of the collimator. The collimator spherical aberration compensation lens is used to compensate for the spherical aberration introduced by the collimator to the collimated welding laser. The concave side of the focusing lens spherical aberration compensation lens is attached to the second convex surface of the focusing lens. The focusing lens spherical aberration compensation lens is used to compensate for the spherical aberration introduced by the focusing lens to the focused welding laser. The protective mirror is disposed between the focusing lens spherical aberration compensation lens and the workpiece to be welded. The protective mirror is a plane mirror.

[0013] Further, the collimator, the focusing lens, the collimator spherical aberration compensation lens, and the focusing lens spherical aberration compensation lens are all coated with a film system that can transmit the welding laser.

[0014] Further, on the other hand, the present utility model also provides a thick plate laser welding method, and the method includes:

[0015] Start the welding system, control the welding laser output head in the welding laser assembly to emit welding laser. The collimator in the welding laser output assembly collimates the welding laser into collimated welding laser. The focusing lens in the welding laser output assembly focuses the collimated welding laser into focused welding laser and then acts on the workpiece to be welded.

[0016] Control the detection laser emitter to emit collimated detection laser, and the collimated detection laser is reflected by the workpiece to be welded.

[0017] Judge the detection laser target adjustment receiver that receives the collimated detection laser, and the azimuth angle of the detection laser target adjustment receiver relative to the detection laser reference receiver.

[0018] Based on the azimuth angle, control the welding system to deflect from the current position towards the direction of the detection laser target adjustment receiver until the detection laser emitted by the detection laser reference emitter is received by the detection laser receiver. During the deflection process of the welding system, control the welding laser assembly to stop providing the focused welding laser to the workpiece to be welded.

[0019] Further, the method further includes:

[0020] Start the welding system, control the welding laser output head in the welding laser assembly to emit welding laser, the collimating mirror in the welding laser output assembly collimates the welding laser into collimated welding laser, and the focusing mirror in the welding laser output assembly focuses the collimated welding laser into focused welding laser and then acts on the workpiece to be welded;

[0021] Control the collimated detection laser to be emitted by the detection laser target adjustment transmitter, and the collimated detection laser is reflected by the workpiece to be welded;

[0022] Judge the detection laser target adjustment transmitter from which the collimated detection laser received by the detection laser receiver originates, and judge the azimuth angle of the detection laser target adjustment transmitter relative to the detection laser reference transmitter;

[0023] Based on the azimuth angle, control the welding system to deflect from the current position towards the direction of the detection laser target adjustment transmitter until the collimated detection laser emitted by the detection laser reference transmitter is received by the detection laser receiver. During the deflection process of the welding system, control the welding assembly to stop providing the focused welding laser to the workpiece to be welded.

[0024] A thick-plate laser welding system provided by the present utility model includes, but is not limited to, the following beneficial effects: (1) In this application, by adjusting the detection laser emission assembly or the detection laser reception assembly, the welding laser can be kept perpendicular to the workpiece to be welded, realizing the precise alignment of the welding laser and the workpiece to be welded, and improving the welding quality and production efficiency; (2) Automatically detect and adjust the position of the welding laser to adapt to the actual situation of the workpiece, ensuring the stability and consistency of the welding process; (3) When the detection laser target adjustment receiver receives the detection laser and the position of the welding system is adjusted, the welding laser assembly will stop emitting the focused welding laser, avoiding unnecessary damage to the workpiece during the adjustment process of the welding system. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the drawings required for use in the description of the embodiments or the prior art will be briefly introduced below.

[0026] Figure 1 It is the overall structural schematic diagram of Embodiment 1 of the present utility model;

[0027] Figure 2 It is the structural principle diagram of Embodiment 1 of the present utility model;

[0028] Figure 3 It is the structural schematic diagram of Embodiment 2 of the present utility model;

[0029] Figure 4It is a schematic diagram of the misalignment between the laser and the workpiece in the embodiment of the present utility model;

[0030] Figure 5 It is a schematic diagram of the adjustment principle of the welding system in the first embodiment of the present utility model;

[0031] Figure 6 It is a schematic diagram of the deflection direction of the welding system in the first embodiment of the present utility model;

[0032] In the figure, 1 - welding laser assembly, 2 - detection laser emission assembly, 3 - detection laser reception assembly, 4 - workpiece to be welded, 11 - welding laser output head, 12 - collimating mirror, 13 - focusing mirror, 14 - collimating mirror spherical aberration compensation lens, 15 - focusing mirror spherical aberration compensation lens, 16 - protective mirror, 21 - detection laser emitter, 22 - detection laser reference emitter, 23 - detection laser adjustment emitter, 231 - first detection laser adjustment emitter, 232 - second detection laser adjustment emitter, 31 - detection laser reference receiver, 32 - detection laser adjustment receiver, 321 - first detection laser adjustment receiver, 322 - second detection laser adjustment receiver, 33 - detection laser receiver. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present utility model.

[0034] This application provides a thick - plate laser welding system. Refer to Figure 1 , the thick - plate laser welding system includes a welding laser assembly 1, a detection laser emission assembly 2, and a detection laser reception assembly 3. The detection laser emission assembly 2 and the detection laser reception assembly 3 are respectively arranged on both sides of the welding laser assembly 1,

[0035] The welding laser assembly 1 is used to provide focused welding laser to the workpiece to be welded to weld the workpiece to be welded 4;

[0036] Refer to Figure 2, the detection laser emission component 1 may include a detection laser emitter 21, which is a beam emitter capable of emitting collimated detection laser. The collimated detection laser it emits has a relatively low laser power, generally between a few milliwatts and dozens of milliwatts. The detection laser reception component 1 includes a detection laser reference receiver 31 and at least one detection laser adjustment receiver 32 disposed on the side of the detection laser reference receiver 31. The function of the detection laser reception component 3 is to receive the collimated detection laser emitted by the detection laser emission component 2. When the detection laser reference receiver 31 receives the detection laser emitted by the detection laser emitter 21, the focused welding laser provided by the welding laser component 1 is perpendicular to the workpiece 4 to be welded;

[0037] The welding system is configured to deflect from the current position towards the direction of the detection laser target adjustment receiver when the detection laser target adjustment receiver receives the detection laser emitted by the detection laser emitter 21 until the detection laser is received by the detection laser reference receiver 31. The detection laser target adjustment receiver is one of the at least one detection laser adjustment receiver 32. During the deflection process of the welding system, the welding laser component 1 stops emitting the focused welding laser.

[0038] Furthermore, there may be multiple detection laser adjustment receivers 32, and the multiple detection laser adjustment receivers 32 are distributed on both sides of the detection laser reference receiver 31.

[0039] Refer to Figure 2 and Figure 5, in a preferred embodiment, the detection laser receiving assembly 3 is configured to detect a detection laser reference receiver 31 and two detection laser adjustment receivers 32. The two detection laser adjustment receivers 32 are respectively distributed on the left and right sides of the detection laser reference receiver 31, and the arrangement order from left to right is the first detection laser adjustment receiver 321, the detection laser reference receiver 31, and the second detection laser adjustment receiver 322. By adjusting the angles of the detection laser emitter 21 and the detection laser reference receiver 31, the collimated detection laser emitted by the detection laser emitter 21 can smoothly reach the detection laser reference receiver 31 after being reflected by the workpiece 4 to be welded that is perpendicular to the welding laser; when the workpiece 4 to be welded is tilted with respect to the welding system, that is, the incident angle of the collimated detection laser emitted by the detection laser emitter 21 on the workpiece changes, and its reflection path also changes accordingly and is received by the detection laser adjustment receiver 32. When the collimated detection laser is received by the first detection laser adjustment receiver 321, the workpiece 4 to be welded is tilted counterclockwise from right to left. At this time, the welding laser assembly 1 is controlled to stop emitting the focused welding laser, and at the same time, the welding system is adjusted to deflect. At this time, the position of the detection laser target adjustment receiver is between the first detection laser adjustment receiver 321 and the detection laser reference receiver 31. The welding system deflects counterclockwise from right to left from the current position towards the direction of the detection laser target adjustment receiver until the collimated detection laser is received by the detection laser collimation receiver 31, and then the welding laser assembly 1 is controlled to emit the focused welding laser for welding; when the collimated detection laser is received by the second detection laser adjustment receiver 322, the workpiece 4 to be welded is tilted clockwise from left to right. At this time, the welding laser assembly 1 is controlled to stop emitting the focused welding laser, and at the same time, the welding system is adjusted to deflect. At this time, the position of the detection laser target adjustment receiver is between the second detection laser adjustment receiver 322 and the detection laser reference receiver 31. The welding system deflects clockwise from left to right from the current position towards the direction of the detection laser target adjustment receiver until the collimated detection laser is received by the detection laser collimation receiver 31, and then the welding laser assembly 1 is controlled to emit the focused welding laser for welding; in this embodiment, the positions of the detection laser emitting assembly 2 and the detection laser receiving assembly 3 can be interchanged.

[0040] It can be understood that in another embodiment, the workpiece to be welded can also be adjusted to deflect in a direction opposite to the deflection direction of the above detection welding system to ensure that the welding laser is perpendicular to the workpiece to be welded.

[0041] In the embodiment of this application, a detection laser emission component 2 and a detection laser reception component 3 are provided. The alignment angle between the welding laser and the workpiece is determined by the reflection angle of the detection laser, and then the deflection of the welding system is adjusted until the welding laser is perpendicular to the workpiece 4 to be welded. By providing multiple detection laser adjustment receivers 32, fine adjustment of the welding system is achieved to ensure the correct alignment of the welding laser, solving the problems of difficult laser alignment and low welding efficiency in conventional thick-plate laser welding. At the same time, during the adjustment process of the welding system, the welding laser component 1 will pause the emission of the focused welding laser, avoiding damage to the workpiece by the welding laser during the adjustment process and improving the welding quality.

[0042] Further, in another example, as Figure 3 shown, the detection laser emission component 2 includes a detection laser reference emitter 22 and at least one detection laser adjustment emitter 23 disposed on the side of the detection laser reference emitter 22. The detection laser reception component 3 includes a detection laser receiver 33. When the detection laser emitted by the detection laser reference emitter 22 is received by the detection laser receiver 33, the focused welding laser provided by the welding laser component 1 is perpendicular to the workpiece 4 to be welded;

[0043] The welding system is configured to deflect from the current position towards the direction of the detection laser target adjustment emitter when the detection laser emitted by the detection laser target adjustment emitter is received by the detection laser receiver 33 until the detection laser emitted by the detection laser reference emitter 22 is received by the detection laser receiver 33. The detection laser target adjustment emitter is one of the at least one detection laser adjustment emitter 23. During the deflection process of the welding system, the welding laser component 1 stops emitting the focused welding laser.

[0044] Further, there may be multiple detection laser adjustment emitters 23, and the multiple detection laser adjustment emitters 23 are distributed on both sides of the detection laser reference emitter 22.

[0045] Further, the detection laser reference emitter 22 and the detection laser adjustment emitter 23 may be lasers with different wavelengths. The detector can distinguish different wavelengths, and the lasers can emit laser simultaneously. The deviation situation is judged by the detector after reception, improving the detection speed.

[0046] Referring to Figure 3, in a preferred embodiment, the detection laser emission assembly 2 is configured to detect a detection laser reference emitter 22 and two detection laser adjustment emitters 23. The two detection laser adjustment emitters 23 are respectively distributed on the left and right sides of the detection laser reference emitter 22, and the arrangement order from left to right is the first detection laser adjustment emitter 231, the detection laser reference emitter 22, and the second detection laser adjustment emitter 232. By adjusting the angles of the three detection laser emitters and the angle of the detection laser receiver 33, the collimated detection laser emitted by the detection laser reference emitter 22 can reach the detection laser receiver 33 smoothly after being reflected by the workpiece 4 to be welded perpendicular to the welding laser, while the collimated detection lasers emitted by the first detection laser adjustment emitter 231 and the second detection laser adjustment emitter 232 are incident on both sides of the detection laser receiver 33 after being reflected by the workpiece 4 perpendicular to the welding laser; and when the workpiece is tilted relative to the welding system, the incident angle of the collimated detection laser emitted by the first or second detection laser adjustment emitter on the workpiece changes, and its reflection path also changes accordingly and is received by the detection laser receiver 33. When the collimated detection laser emitted by the first detection laser adjustment emitter 231 is received by the detection laser receiver 33, the workpiece 4 to be welded is tilted counterclockwise from right to left. At this time, the welding laser assembly 1 is controlled to stop emitting the focused welding laser, and at the same time, the welding system is adjusted to deflect. At this time, the position of the detection laser target adjustment emitter is between the first detection laser adjustment emitter 231 and the detection laser reference emitter 22, and the welding system deflects counterclockwise from right to left from the current position towards the direction of the detection laser target adjustment emitter until the collimated detection laser emitted by the detection laser reference emitter 22 is received by the detection laser receiver 33, and then the welding laser assembly 1 is controlled to emit the focused welding laser for welding; when the collimated detection laser emitted by the second detection laser adjustment emitter 232 is received by the detection laser receiver 33, the workpiece 4 to be welded is tilted clockwise from left to right. At this time, the welding laser assembly 1 is controlled to stop emitting the focused welding laser, and at the same time, the welding system is adjusted to deflect. At this time, the position of the detection laser target adjustment emitter is between the second detection laser adjustment emitter 232 and the detection laser reference emitter 22, and the welding system deflects clockwise from left to right from the current position towards the direction of the detection laser target adjustment emitter until the collimated detection laser emitted by the detection laser reference emitter 22 is received by the detection laser receiver 33, and then the welding laser assembly 1 is controlled to emit the focused welding laser for welding; in this embodiment, the positions of the detection laser emission assembly 2 and the detection laser reception assembly 3 can be interchanged.

[0047] It can be understood that in another embodiment, the workpiece to be welded can also be adjusted to deflect in a direction opposite to the deflection direction of the above detection welding system to ensure that the welding laser is perpendicular to the workpiece to be welded.

[0048] In this embodiment, a detection laser receiver and multiple detection laser transmitters are provided. Since the detection laser transmitters are cheaper than the detection laser receiver, the cost is further reduced.

[0049] Furthermore, referring to Figure 2 and Figure 3 , the welding laser assembly 1 further includes a welding laser output head 11, a collimating mirror 12, and a focusing mirror 13. The collimating mirror 12 is located between the welding laser output head 11 and the focusing mirror 13. The welding laser output head 11 emits welding laser, which is collimated by the collimating mirror 12 to form collimated welding laser. The focusing mirror 13 is used to focus the collimated welding laser to form focused welding laser and then emit it onto the workpiece 4 to be welded. Through the collimation and focusing processes, the quality and shape of the welding laser beam are precisely controlled, improving the welding accuracy, quality, and welding effect.

[0050] Furthermore, the welding laser assembly 1 further includes a collimating mirror spherical aberration compensation lens 14, a focusing mirror spherical aberration compensation lens 15, and a protective mirror 16. The collimating mirror 12 and the focusing mirror 13 are double convex lenses, and the collimating mirror spherical aberration compensation lens 14 and the focusing mirror spherical aberration compensation lens 15 are plano-concave lenses. The collimating mirror spherical aberration compensation lens 14 is disposed between the collimating mirror 12 and the focusing mirror 13, and the concave side of the collimating mirror spherical aberration compensation lens 14 is attached to the first convex surface of the collimating mirror 12. The collimating mirror spherical aberration compensation lens 14 is used to compensate for the spherical aberration introduced by the collimating mirror 12 to the collimated welding laser. The concave side of the focusing mirror spherical aberration compensation lens 15 is attached to the second convex surface of the focusing mirror 13. The focusing mirror spherical aberration compensation lens 15 is used to compensate for the spherical aberration introduced by the focusing mirror 13 to the focused welding laser. The protective mirror 16 is disposed between the focusing mirror spherical aberration compensation lens 15 and the workpiece 4 to be welded, and the protective mirror 16 is a flat mirror. By introducing spherical aberration compensation lenses, the spherical aberration of the laser beam is reduced, improving the quality of the laser beam. The protective mirror is provided to prevent spatter and heat during the welding process from damaging the optical elements, enhancing the stability and durability of the system, and further improving the welding accuracy and production efficiency in thick plate laser welding.

[0051] Furthermore, the collimating mirror 12, the focusing mirror 13, the collimating mirror spherical aberration compensation lens 14, and the focusing mirror spherical aberration compensation lens 15 are all coated with a film system that can transmit welding laser. By coating the lens surface with a film system that can transmit welding laser, not only can the transmittance and utilization efficiency of the laser be improved, but also the lens can be protected, reducing the thermal influence, improving the welding quality, enhancing the stability and reliability of the system, and improving the performance of the entire welding laser system.

[0052] Furthermore, the present utility model also provides a thick plate laser welding method, including:

[0053] Start the welding system, control the welding laser output head 11 in the welding laser assembly 1 to emit welding laser, the collimating mirror 12 in the welding laser assembly 1 collimates the welding laser into collimated welding laser, and the focusing mirror 13 in the welding laser assembly 1 focuses the collimated welding laser into focused welding laser and then acts on the workpiece 4 to be welded;

[0054] Control the detection laser emitter 21 to emit collimated detection laser, and the collimated detection laser is reflected by the workpiece 4 to be welded;

[0055] Judge the detection laser target adjustment receiver that receives the collimated detection laser, and the azimuth angle of the detection laser target adjustment receiver relative to the detection laser reference receiver 22;

[0056] Based on the azimuth angle, control the welding system to deflect from the current position towards the direction of the detection laser target adjustment receiver until the detection laser emitted by the detection laser emitter 21 is received by the detection laser reference receiver 31. During the deflection process of the welding system, control the welding laser assembly 1 to stop providing focused welding laser to the workpiece 4 to be welded.

[0057] Through the collimated detection laser emitted by the detection laser emitter, the system can accurately detect and align the positional relationship between the welding laser and the workpiece to be welded, ensuring that the welding laser accurately acts on the predetermined welding area; according to the azimuth angle of the detection laser received by the detection laser target adjustment receiver, the position of the welding system is adjusted in real time to maintain the correct alignment of the welding laser, improving the flexibility and adaptability of the welding process; during the deflection process of the welding system, control the welding laser assembly to stop providing focused welding laser to the workpiece, avoiding unnecessary thermal damage or welding defects to the workpiece during the adjustment process, and further improving the welding quality and production efficiency.

[0058] Furthermore, the method further includes:

[0059] Start the welding system, control the welding laser output head 11 in the welding laser assembly 1 to emit welding laser, the collimating mirror 12 in the welding laser output assembly 1 collimates the welding laser into collimated welding laser, and the focusing mirror 13 in the welding laser output assembly 1 focuses the collimated welding laser into focused welding laser and then acts on the workpiece 4 to be welded;

[0060] Control the detection laser target adjustment emitter to emit collimated detection laser, and the collimated detection laser is reflected by the workpiece 4 to be welded;

[0061] Judge the detection laser target adjustment emitter from which the collimated detection laser received by the detection laser receiver 33 originates, and judge the azimuth angle of the detection laser target adjustment emitter relative to the detection laser reference emitter 22;

[0062] Based on the azimuth angle, the welding system adjusts the direction deflection of the emitter from the current position towards the detected laser target until the collimated detection laser emitted by the detection laser reference emitter 22 is received by the detection laser receiver 33. During the deflection process of the welding system, the control welding laser assembly 1 stops providing the focused welding laser to the workpiece 4 to be welded.

[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A thick plate laser welding system, characterized in that: The welding system includes a welding laser assembly (1), a detection laser emission assembly (2), and a detection laser reception assembly (3). The detection laser emission assembly (2) and the detection laser reception assembly (3) are respectively arranged on both sides of the welding laser assembly (1). The welding laser assembly (1) is used to provide focused welding laser to the workpiece to be welded, so as to weld the workpiece to be welded (4). The detection laser emission assembly (2) includes a detection laser emitter (21). The detection laser reception assembly (3) includes a detection laser reference receiver (31) and at least one detection laser adjustment receiver (32) arranged on the side of the detection laser reference receiver (31). When the detection laser reference receiver (31) receives the detection laser emitted by the detection laser emitter (21), the focused welding laser provided by the welding laser assembly (1) is perpendicular to the workpiece to be welded (4). When the detection laser target adjustment receiver receives the collimated detection laser emitted by the detection laser emitter (21), the welding system deflects from the current position towards the direction of the detection laser target adjustment receiver until the detection laser is received by the detection laser reference receiver (31). The detection laser target adjustment receiver is one of at least one of the detection laser adjustment receivers (32). During the deflection process of the welding system, the welding laser assembly (1) stops emitting the focused welding laser.

2. The thick plate laser welding system according to claim 1, wherein There are multiple detection laser adjustment receivers (32), and the multiple detection laser adjustment receivers (32) are distributed on both sides of the detection laser reference receiver (31).

3. The thick plate laser welding system according to claim 1, wherein The detection laser emission assembly (2) includes a detection laser reference emitter (22) and at least one detection laser adjustment emitter (23) arranged on the side of the detection laser reference emitter (22). The detection laser reception assembly (3) includes a detection laser receiver (33). When the detection laser emitted by the detection laser reference emitter (22) is received by the detection laser receiver (33), the focused welding laser provided by the welding laser assembly (1) is perpendicular to the workpiece to be welded (4). The detection laser reference emitter (22) and the detection laser adjustment emitter (23) emit laser in sequence. When the detection laser emitted by the detection laser target adjustment emitter is received by the detection laser receiver (33), the welding system deflects from the current position towards the direction of the detection laser target adjustment emitter until the detection laser emitted by the detection laser reference emitter (22) is received by the detection laser receiver (33). The detection laser target adjustment emitter is one of at least one of the detection laser adjustment emitters (23). During the deflection process of the welding system, the welding laser assembly (1) stops emitting the focused welding laser.

4. The thick plate laser welding system according to claim 3, wherein, There are multiple detection laser adjustment emitters (23), and the multiple detection laser adjustment emitters (23) are distributed on both sides of the detection laser reference emitter (22).

5. The thick plate laser welding system according to claim 1, wherein The welding laser assembly (1) includes a welding laser output head (11), a collimating mirror (12), and a focusing mirror (13). The collimating mirror (12) is located between the welding laser output head (11) and the focusing mirror (13). The welding laser output head (11) emits welding laser, which is collimated by the collimating mirror (12) to form collimated welding laser. The focusing mirror (13) is used to focus the collimated welding laser to form focused welding laser and then emit it onto the workpiece to be welded (4).

6. The thick plate laser welding system according to claim 5, characterized in that: The welding laser assembly (1) further includes a collimating mirror spherical aberration compensation lens (14), a focusing mirror spherical aberration compensation lens (15), and a protective mirror (16). The collimating mirror (12) and the focusing mirror (13) are biconvex lenses. The collimating mirror spherical aberration compensation lens (14) and the focusing mirror spherical aberration compensation lens (15) are plano-concave lenses. The collimating mirror spherical aberration compensation lens (14) is arranged between the collimating mirror (12) and the focusing mirror (13). The concave side of the collimating mirror spherical aberration compensation lens (14) is attached to the first convex surface of the collimating mirror (12). The collimating mirror spherical aberration compensation lens (14) is used to compensate for the spherical aberration introduced by the collimating mirror (12) to the collimated welding laser. The concave side of the focusing mirror spherical aberration compensation lens (15) is attached to the second convex surface of the focusing mirror (13). The focusing mirror spherical aberration compensation lens (15) is used to compensate for the spherical aberration introduced by the focusing mirror (13) to the focused welding laser. The protective mirror (16) is arranged between the focusing mirror spherical aberration compensation lens (15) and the workpiece to be welded (4). The protective mirror (16) is a plane mirror.

7. The thick plate laser welding system according to claim 6, wherein: The collimating mirror (12), the focusing mirror (13), the collimating mirror spherical aberration compensation lens (14), and the focusing mirror spherical aberration compensation lens (15) are all coated with a film system that can transmit welding laser.

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