A dual spot laser welding system and welding gun
By designing independent first and second optical paths and integrating them into the same welding gun, the problems of spatter and forming when welding thick plates in existing laser welding equipment are solved. This enables laser welding with a wider power range and a wider wavelength, resulting in improved welding quality, a simpler structure, and easier maintenance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU YIRONG YIGU TECH CO LTD
- Filing Date
- 2025-07-23
- Publication Date
- 2026-07-07
AI Technical Summary
Existing low-power laser welding equipment suffers from defects such as large spatter and poor weld formation when welding thicker plates. Furthermore, existing dual-beam lasers are costly, have complex systems, and poor beam quality.
It employs independent first and second optical paths, forming dual light spots through independent focusing lenses. The optical path design allows the use of lasers of different wavelengths, and the beams can be adjusted independently, all combined in the same welding gun.
It achieves welding with a wider power range and broader laser wavelength, with stable welding without spatter, good forming, and ideal penetration and surface width. The structure is compact and easy to maintain.
Smart Images
Figure CN224463909U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of laser welding device technology, and particularly relates to a dual-spot laser welding system and welding gun. Background Technology
[0002] Low-power laser welding is now widely used in various metal processing industries. However, when welding thicker plates, simply increasing the laser beam power does not achieve the desired improvement in penetration depth, but also results in defects such as significantly larger spatter and poor weld formation.
[0003] Existing technologies typically employ a larger ring-shaped laser beam around a smaller laser beam or a low-power laser spot, forming a dual-beam configuration to address the aforementioned issues. However, currently available dual-beam lasers are expensive, and maintenance and repair are very costly. On the other hand, such as Figure 1 As shown, existing designs use two collimating lenses and reflections for each light source, ultimately achieving a dot-ring or double-ring beam overlap through a single focusing lens to create a dot-ring or double-ring shaped focal spot. The drawback of this design is that it can only achieve combinations of different wavelengths. For example, combining an infrared laser with a wavelength of approximately 1000nm with a blue laser with a wavelength of approximately 450nm requires a combination of semiconductor and fiber lasers, resulting in a relatively small output power range, relatively poor beam quality, and a complex system. Utility Model Content
[0004] To address the shortcomings of existing technologies, this invention provides a dual-spot laser welding system and welding gun, which has a simple overall structure, a wider power range, and helps to improve welding quality.
[0005] In order to achieve the purpose of this utility model, the following solution is proposed:
[0006] A dual-spot laser welding system includes: a first optical path and a second optical path;
[0007] The first optical path is provided with a first light source, a first collimating mirror, a first reflecting mirror, a second reflecting mirror and a first focusing mirror in sequence. The first reflecting mirror and the second reflecting mirror are oscillating, and the axes of oscillation are perpendicular to each other.
[0008] The second optical path is provided with a second light source, a second collimating mirror, a third reflecting mirror, a fourth reflecting mirror and a second focusing mirror in sequence. The third reflecting mirror and the fourth reflecting mirror are oscillating, and the oscillation axes are perpendicular to each other.
[0009] The first focusing lens and the second focusing lens have the same focal length.
[0010] A dual-spot welding gun includes a left gun body, a right gun body, a gun barrel, and the aforementioned dual-spot welding system;
[0011] The first light source, the first collimating lens, the first reflecting lens, the second reflecting lens, and the first focusing lens are located inside the left gun body;
[0012] The second light source, the second collimating lens, the third reflecting lens, the fourth reflecting lens, and the second focusing lens are located inside the right gun body;
[0013] The upper ends of the left and right gun bodies are connected, and the lower ends of the left and right gun bodies are connected to the upper end of the barrel. The focal points of the first and second focusing scopes are located outside the lower end of the barrel.
[0014] The beneficial effects of this utility model are as follows:
[0015] 1. The welding system consists of independent first and second optical paths, which are ultimately formed into dual light spots through a separate focusing lens. The output power range is larger, and the applicable laser wavelength range is wider, which makes the laser welding stable, spatter-free, with good shape, and the penetration depth and surface width reach the desired ideal effect.
[0016] 2. The first and second optical paths are integrated into the same welding gun, which has a compact structure and simple maintenance. Furthermore, the beam trajectories and beam geometry of the first and second optical paths can be adjusted independently. Attached Figure Description
[0017] The accompanying drawings described herein are merely illustrative of selected embodiments, not all possible implementations, and are not intended to limit the scope of this invention.
[0018] Figure 1 The prior art dual-optical-path structure is shown.
[0019] Figure 2 The dual-beam path structure of the dual-spot welding system of this application is shown.
[0020] Figure 3 A schematic diagram of the welding gun of this application is shown.
[0021] Figure 4 A cross-sectional view of the welding gun of this application is shown.
[0022] Figure 5 A schematic diagram of the structure of the other side of the welding gun of this application is shown.
[0023] Figure 6 It shows Figure 5 A magnified view of a portion of point A in the middle.
[0024] The markings in the diagram are: First collimating lens-11, First reflecting mirror-12, Second reflecting mirror-13, First focusing lens-14, First light source-15, Second collimating lens-21, Third reflecting mirror-22, Fourth reflecting mirror-23, Second focusing lens-24, Second light source-25, Protective lens-1, Drive motor-2, Left gun body-3, Pin-31, Right gun body-4, Barrel-5, Screw-51, Strip hole-52, Nozzle-53. Detailed Implementation
[0025] To make the objectives, technical solutions and advantages of the present utility model clearer, the implementation methods of the present utility model will be described in detail below with reference to the accompanying drawings. However, the embodiments described in the present utility model are only some embodiments of the present utility model, and not all embodiments.
[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, and are only for the convenience of describing this utility model and simplifying the description. The terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "parallel," "vertical," etc., do not mean that the components are required to be absolutely parallel or perpendicular, but can be slightly tilted.
[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0029] Example 1, such as Figure 2 As shown, a dual-spot laser welding system includes a first optical path and a second optical path.
[0030] Specifically, such as Figure 2 As shown, the first optical path is provided with a first light source 15, a first collimating mirror 11, a first reflecting mirror 12, a second reflecting mirror 13 and a first focusing mirror 14 in sequence. The first reflecting mirror 12 and the second reflecting mirror 13 are oscillating, and the oscillation axes are perpendicular to each other.
[0031] Specifically, such as Figure 2 As shown, the second optical path is provided with a second light source 25, a second collimating mirror 21, a third reflecting mirror 22, a fourth reflecting mirror 23 and a second focusing mirror 24 in sequence. The third reflecting mirror 22 and the fourth reflecting mirror 23 are oscillating, and the oscillation axes are perpendicular to each other.
[0032] The first focusing lens 14 and the second focusing lens 24 have the same focal length.
[0033] In this scheme, the wavelengths of the first light source 15 and the second light source 25 can be the same or different. Since both optical paths are independently designed, controlled, and do not interfere with each other, the focus is only aligned at the focal point after the output of the optical path through the entire gun structure. Therefore, the two light sources can use lasers of the same wavelength or two lasers of different wavelengths. In a conventional optical path, the two light sources enter the gun body from the laser and the QBH light source. The optical path design mainly includes independent collimation systems and / or galvanometer reflection systems. The two light sources are combined into one beam using a beam combining system with the same focusing lens. Typically, light source A is incident at a 45-degree angle to the beam combining mirror's reflecting surface, and after reflection, it enters the focusing lens. Light source B is transmitted at a 45-degree angle from the other side of the beam combining mirror and then enters the focusing lens. Due to the characteristics of the beam combining mirror itself, the optical path can only achieve the working principle of reflection on one side and transmission on the other. The coating characteristics of the reflecting and transmitting surfaces are different, making it impossible to achieve the goal of both reflecting and transmitting two lasers of the same wavelength. Therefore, existing dual-optical-path welding technologies are limited to beam combining lasers of different wavelengths.
[0034] Specifically, the first light source 15 and the second light source 25 can be set to red laser or blue laser. For example, the first light source 15 can be set to infrared laser and the second light source 25 to blue laser; the first light source 15 can be set to infrared laser and the second light source 25 to infrared laser; or the first light source 15 can be set to blue laser and the second light source 25 to blue laser.
[0035] During the welding process, the first reflector 12 and the second reflector 13 reciprocate within a predetermined angle range. The first reflector 12 and the second reflector 13 can reciprocate simultaneously or individually, while the third reflector 22 and the fourth reflector 23 remain fixed. This allows the focal point of the second focusing mirror 24 to remain fixed, forming a dot-shaped light spot. The focal point of the second focusing mirror 24 is the focal point of the entire welding torch. The focal point of the first focusing mirror 14 will circulate around the focal point of the second focusing mirror 24, forming a ring-shaped light spot. When the first reflector 12 and the second reflector 13 reciprocate simultaneously and at the same speed, the ring-shaped light spot will have a circular structure. Depending on the requirements, the first reflector 12 and the second reflector 13 can also move individually or reciprocate at different speeds to form a polygonal ring-shaped light spot. As another embodiment, the third reflector 22 and the fourth reflector 23 can also reciprocate while keeping the first reflector 12 and the second reflector 13 fixed.
[0036] Preferably, the angle between the first optical path and the second optical path is adjustable. After adjusting the angle, the first focusing lens 14 and the second focusing lens 24 with the same focal length can be replaced to change the focal length of the entire gun, thereby achieving the purpose of adjusting the focal length of the entire gun.
[0037] Example 2, as Figures 3 to 5 As shown, a dual-spot welding gun includes a left gun body 3, a right gun body 4, a gun barrel 5, and the dual-spot welding system described in Embodiment 1. The left gun body 3 has a cavity for arranging a first optical path, and the right gun body 4 has a cavity for arranging a second optical path. The trajectories of the first and second optical paths are as follows: Figure 4 The dotted lines in the text indicate the meaning.
[0038] Specifically, such as Figure 4 As shown, the first light source 15, the first collimating lens 11, the first reflecting lens 12, the second reflecting lens 13 and the first focusing lens 14 are located inside the left gun body 3.
[0039] Specifically, such as Figure 4 As shown, the second light source 25, the second collimating lens 21, the third reflecting lens 22, the fourth reflecting lens 23, and the second focusing lens 24 are located inside the right gun body 4.
[0040] Specifically, such as Figures 3 to 5 As shown, the upper ends of the left gun body 3 and the right gun body 4 are connected, and the lower ends of the left gun body 3 and the right gun body 4 are connected to the upper end of the barrel 5. The focal points of the first focusing lens 14 and the second focusing lens 24 are located outside the lower end of the barrel 5.
[0041] The above solution cleverly combines two independent laser beams to achieve a dual-spot effect. Furthermore, each independent laser beam is based on a mature laser system, ensuring high reliability and simple maintenance. The ingenuity of this solution lies in the fusion of both beams into the same laser welding torch structure, and the independent adjustment of beam trajectory and geometry for each beam. This helps achieve the ideal spot size, resulting in stable laser welding, spatter-free welding, good weld formation, and achieving the desired penetration depth and surface width.
[0042] Preferred, such as Figures 3 to 5 As shown, the upper ends of the left gun body 3 and the right gun body 4 are rotatably connected by a pin 31, which is used to adjust the angle between the first optical path and the second optical path. The left gun body 3 and the right gun body 4 are connected to the gun barrel 5 by screws 51.
[0043] Specifically, such as Figure 6 As shown, the lower end faces of the left gun body 3 and the right gun body 4 are outer arc surface structures, and the upper end face of the gun barrel 5 is an inner arc surface structure. The outer arc surface structures fit together, that is, no matter how large the included angle is between the left gun body 3 and the right gun body 4, the inner arc surface matches the outer arc surface.
[0044] Specifically, such as Figure 6 As shown, a slotted hole 52 is provided on the outer side of the barrel 5. The opening direction of the slotted hole 52 is consistent with the length direction of the barrel 5. The length direction of the slotted hole 52 is consistent with the angle adjustment direction of the left gun body 3 and the right gun body 4. At least two screws 51 pass through the slotted hole 52 from bottom to top and are locked to the lower ends of the left gun body 3 and the right gun body 4 respectively. Before adjusting the angle between the left gun body 3 and the right gun body 4, the screws 51 need to be loosened, and then the left gun body 3 or the right gun body 4 can be swung to achieve the purpose of adjusting the angle. After the angle is adjusted, the screws 51 can be locked.
[0045] Preferred, such as Figure 4 , Figure 6 As shown, protective lenses 1 are provided after the first focusing lens 14 and the second focusing lens 24 on the left gun body 3 and the right gun body 4, respectively, to reduce the direct or indirect damage to the optical path and laser of the gun body caused by spatter and dust from the welding pool during the welding process. The first focusing lens 14, the second focusing lens 24, the protective lens 1, the first collimating lens 11, and the second collimating lens 21 are all detachable mounting structures.
[0046] Preferred, such as Figures 3 to 5 As shown, a nozzle 53 is provided at the lower end of the barrel 5. The nozzle 53 is movable along the axis of the barrel 5 to adjust the distance between the muzzle and the burnt spot. This allows the protective gas blown out by the nozzle 53 to meet the protection requirements of different power levels for the weld pool, preventing contamination of the welding area, ensuring welding quality, dispersing harmful gases to prevent porosity, assisting in cooling to remove heat from the nozzle and welding area, avoiding nozzle damage, and reducing the risk of workpiece deformation. The focal points of the first focusing lens 14 and the second focusing lens 24 are located outside the lower end of the nozzle 53.
[0047] Preferred, such as Figures 3 to 5 As shown, the first reflector 12, the second reflector 13, the third reflector 22 and the fourth reflector 23 are each equipped with a separate drive motor 2. The drive motor 2 is respectively installed on the corresponding left gun body 3 and right gun body 4. Specifically, the main shafts of the drive motor 2 corresponding to the first reflector 12 and the second reflector 13 are perpendicular to each other, and the main shafts of the drive motor 2 corresponding to the third reflector 22 and the fourth reflector 23 are perpendicular to each other.
[0048] The above description is merely a preferred embodiment of this utility model and does not imply its uniqueness or limitation. Those skilled in the art should understand that various changes or equivalent substitutions made to this utility model without departing from its scope are all within the protection scope of this utility model.
Claims
1. A dual-spot laser welding system, characterized in that, include: First optical path and second optical path; The first optical path is provided with a first light source (15), a first collimating lens (11), a first reflecting mirror (12), a second reflecting mirror (13) and a first focusing lens (14) in sequence. The first reflecting mirror (12) and the second reflecting mirror (13) are oscillating, and the axes of oscillation are perpendicular to each other. The second optical path is provided with a second light source (25), a second collimating lens (21), a third reflecting mirror (22), a fourth reflecting mirror (23) and a second focusing lens (24) in sequence. The third reflecting mirror (22) and the fourth reflecting mirror (23) are oscillating, and the axes of oscillation are perpendicular to each other. The first focusing lens (14) and the second focusing lens (24) have the same focal length.
2. The dual-spot laser welding system according to claim 1, characterized in that, The angle between the first optical path and the second optical path is adjustable.
3. A dual-spot welding gun, characterized in that, Includes a left gun body (3), a right gun body (4), a gun barrel (5), and a dual-spot laser welding system as described in any one of claims 1 to 2; The first light source (15), the first collimating lens (11), the first reflecting mirror (12), the second reflecting mirror (13) and the first focusing lens (14) are located inside the left gun body (3); The second light source (25), the second collimating lens (21), the third reflecting mirror (22), the fourth reflecting mirror (23) and the second focusing lens (24) are located inside the right gun body (4); The upper ends of the left gun body (3) and the right gun body (4) are connected, and the lower ends of the left gun body (3) and the right gun body (4) are connected to the upper end of the barrel (5). The focal points of the first focusing lens (14) and the second focusing lens (24) are located outside the lower end of the barrel (5).
4. A dual-spot welding gun according to claim 3, characterized in that, The upper ends of the left gun body (3) and the right gun body (4) are rotatably connected by a pin (31) to adjust the angle between the first optical path and the second optical path. The left gun body (3) and the right gun body (4) are connected to the gun barrel (5) by screws (51).
5. A dual-spot welding gun according to claim 4, characterized in that, The lower end faces of the left gun body (3) and the right gun body (4) are outer arc surface structures, and the upper end face of the gun barrel (5) is an inner arc surface structure. The outer arc surface structures fit together.
6. A dual-spot welding gun according to claim 4, characterized in that, The barrel (5) has a slotted hole (52) on the outside. The opening direction of the slotted hole (52) is consistent with the length direction of the barrel (5). The length direction of the slotted hole (52) is consistent with the angle adjustment direction of the left gun body (3) and the right gun body (4). At least two screws (51) pass through the slotted hole (52) from bottom to top and are locked to the lower end of the left gun body (3) and the right gun body (4) respectively.
7. A dual-spot welding gun according to claim 3, characterized in that, The left gun body (3) and the right gun body (4) are equipped with protective lenses (1) after the first focusing lens (14) and the second focusing lens (24).
8. A dual-spot welding gun according to claim 3, characterized in that, The lower end of the barrel (5) is provided with a nozzle (53), which is moved along the axis of the barrel (5). The focal point of the first focusing lens (14) and the second focusing lens (24) is located outside the lower end of the nozzle (53).
9. A dual-spot welding gun according to claim 3, characterized in that, The first reflector (12), the second reflector (13), the third reflector (22) and the fourth reflector (23) are each equipped with a separate drive motor (2), which is installed on the corresponding left gun body (3) and right gun body (4).