Laser welding shielding gas assembly and laser welding gun

Abstract

The invention provides a laser welding shielding gas assembly and a laser welding gun, the laser welding shielding gas assembly is used for guiding shielding gas to a nozzle of the laser welding gun, and the laser welding shielding gas assembly is characterized by comprising a central pipeline, a flow divider and the nozzle, the central pipeline is used for allowing laser to pass through and allowing corresponding first protective airflow to flow out through a first air outlet end located on the central pipeline; the flow divider is arranged on the outer side of the central pipeline in a sleeving mode and provided with a second air outlet end used for enabling the second protective airflow to flow out. The flow divider is sleeved with the nozzle, and the first air outlet end and the second air outlet end are both arranged in a cavity of the nozzle. Wherein the flow velocity of the first protective gas is greater than that of the second protective gas. The flow velocity of the second protective gas is small, so that the second protective gas can stay at the weld joint for a longer time than the flow velocity of the first protective gas, the protective time of the weld joint is prolonged, and the stay time of the protective gas at the weld joint is prolonged as a whole.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, and in particular to a laser welding shielding gas assembly and a laser welding torch. Background Technology

[0002] Existing laser welding torches offer concentrated energy and high welding speeds. However, when the weld seam remains at a high temperature after welding, the shielding gas used to protect the weld seam disappears, leading to direct contact between the weld surface and oxygen in the air. This causes an oxidation reaction, resulting in a darker weld color and reduced weld strength due to the formation of oxides, directly impacting the welding outcome. Currently, a common solution is to increase the flow rate of the shielding gas to achieve wider coverage. However, this increases the amount of shielding gas used, thereby increasing welding costs. Summary of the Invention

[0003] The present invention aims to solve at least one aspect of the aforementioned technical problems and defects existing in the prior art.

[0004] According to a first aspect of the present invention, a laser welding shielding gas assembly is provided for guiding shielding gas to the nozzle of a laser welding torch, characterized in that the laser welding shielding gas assembly comprises:

[0005] A central conduit through which the laser passes and through which a corresponding first protective gas flow exits via a first outlet located thereon;

[0006] A flow divider, sleeved on the outside of the central duct, having a second outlet for discharging a second protective gas flow; and

[0007] The nozzle, wherein the distributor is sleeved inside the nozzle, and both the first outlet end and the second outlet end are disposed within the cavity of the nozzle;

[0008] The flow rate of the first protective gas is greater than the flow rate of the second protective gas.

[0009] In one exemplary embodiment, the distance between the first air outlet and the weldment corresponding to the nozzle is greater than the distance between the second air outlet and the weldment corresponding to the nozzle.

[0010] In one exemplary embodiment, the splitter is provided with a diffuser near the second outlet end, and the second protective airflow can reduce its velocity after passing through the diffuser.

[0011] In one exemplary embodiment, the diffuser is an air screen.

[0012] In one exemplary embodiment, the laser welding shielding gas assembly further includes an outer pipe sleeved outside the central pipe, and a second flow channel is provided between the central pipe and the outer pipe for the flow of the second shielding gas.

[0013] In one exemplary embodiment, the cross-section of the central pipe is a regular polygon with three or more sides, and the gap between the outer side of the regular polygon and the outer pipe forms the second flow channel; or, at least one groove is provided on the outer side of the central pipe, and the extension direction of the groove is parallel to the axis of the central pipe.

[0014] In one exemplary embodiment, the end of the distributor connected to the outer pipe is sealed; or, the end of the outer pipe connected to the central pipe away from the distributor is sealed.

[0015] In one exemplary embodiment, the distributor has a diversion channel, one end of which is connected to the second air outlet, and the other end of which is connected to the stepped portion formed by the central pipe and the outer channel.

[0016] In one exemplary embodiment, the laser welding shielding gas assembly further includes a fixing seat, which is disposed outside the outer layer pipe and the fixing seat and the nozzle are respectively disposed at both ends of the outer layer pipe. The fixing seat has an internal channel and a central channel, which are independent of each other. The central channel is connected to the first gas outlet end, and the internal channel is connected to the second flow channel.

[0017] In one exemplary embodiment, at the connection between the fixed base and the outer pipe, the outer pipe is provided with a first connecting hole, and along the axial direction of the outer pipe, both ends of the first connecting hole are sealed at the connection with the fixed base.

[0018] In one exemplary embodiment, the laser welding shielding gas assembly further includes a flow divider having a first channel and a second channel, and the flow divider ring also having a front end and a rear end along the gas flow direction, wherein the first channel and the second channel are interconnected at the front end of the flow divider.

[0019] Specifically, at the rear end of the diverter, the first channel is connected to the central channel, and the second channel is connected to the internal channel.

[0020] In one exemplary embodiment, the mounting base has an end face annular groove, the diverter is embedded in the end face annular groove, and the hole at the end face annular groove communicates with the second channel of the diverter.

[0021] In one exemplary embodiment, the diverter is a hollow cylindrical structure with two cylindrical sections of different outer diameters. The outer diameter of the front end is smaller than that of the rear end. The second channel is disposed inside the rear end, and a second connecting hole communicating with the hollow portion is provided on the inner wall of the front end.

[0022] According to a second aspect of the present invention, the present invention also provides a laser welding torch, the laser welding torch comprising the laser welding shielding gas assembly as described above.

[0023] In one exemplary embodiment, the laser welding torch further includes a welding torch body, which is sealed to a flow divider of the laser welding shielding gas assembly. The shielding gas entering the flow divider flows to the first outlet end and the second outlet end respectively after being divided by the first channel and the second channel.

[0024] In one exemplary embodiment, a filter screen is provided inside the central pipe, and the laser passes through the filter screen to form a light-transmitting gap that conforms to the trajectory and size of the beam swing.

[0025] Based on common knowledge in the field, the above exemplary embodiments can be freely combined to obtain the preferred embodiments of this application.

[0026] The beneficial effects of this invention are as follows: In the shielding gas assembly for laser welding, the first shielding gas flows out from the central pipe, and the second shielding gas flows out from the second outlet of the distributor. Since the second outlet is located outside the first outlet, and the flow rate of the second shielding gas is lower than that of the first shielding gas, the first shielding gas cannot remain at the weld for an extended period after flowing out of the central pipe. However, the lower flow rate of the second shielding gas allows it to remain at the weld for a longer time than the first shielding gas, thus extending the protection time for the weld. Overall, the first and second shielding gases increase the residence time of the shielding gas at the weld. This increased residence time prevents the weld from oxidizing with the surrounding air under the protective atmosphere of the shielding gas, improving the welding effect and the structural strength of the weld. Attached Figure Description

[0027] Figure 1 This is a first-view perspective three-dimensional structural schematic diagram of the diversion component according to an embodiment of the present invention.

[0028] Figure 2This is a two-dimensional structural schematic diagram of the diverter in an embodiment of the present invention from a second perspective.

[0029] Figure 3 This is a three-dimensional structural diagram of the fixing base according to an embodiment of the present invention.

[0030] Figure 4 This is a schematic diagram of the internal cross-sectional structure of the fixing seat according to an embodiment of the present invention.

[0031] Figure 5 This is a three-dimensional structural diagram of the central pipe in an embodiment of the present invention.

[0032] Figure 6 This is a three-dimensional structural diagram of the outer pipe according to an embodiment of the present invention.

[0033] Figure 7 This is a partial three-dimensional structural diagram of the interconnected central pipe and outer pipe in an embodiment of the present invention.

[0034] Figure 8 This is a three-dimensional structural schematic diagram of the laser welding protective gas assembly according to an embodiment of the present invention.

[0035] Figure 9 This is a cross-sectional view of the laser welding shielding gas assembly according to an embodiment of the present invention.

[0036] Figure 10 This is a structural schematic diagram of the airflow direction of the laser welding protective gas assembly according to an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures

[0038] 1-Laser welding shielding gas assembly; 10-Central pipe; 101-Filter screen; 102-Dust cap; 11-First gas outlet; 20-Diverter; 21-Second gas outlet; 22-Diffuser; 23-Diverter channel; 221-Gas screen; 30-Nozzle; 40-Outer pipe; 41-Second flow channel; 42-Groove; 43-First connecting hole; 50-Stepped section; 60-Fixing base; 61-Internal channel; 62-Central channel; 63-End face annular groove; 70-Diverter; 71-First channel; 72-Second channel; 73-Front end; 74-Rear end; 75-Second connecting hole; 80-Welding torch body. Detailed Implementation

[0039] The technical solution of the present invention will be further described in detail below through exemplary embodiments and in conjunction with the accompanying drawings. It should be understood that although terms indicating direction, such as "front," "rear," "upper," "lower," "left," and "right," are used in this invention to describe various exemplary structural parts and elements of the invention, these terms are used only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the exemplary embodiments described in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limiting. Where possible, the same or similar reference numerals used in this invention refer to the same or similar parts.

[0040] Furthermore, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a full understanding of exemplary embodiments of the invention. However, it will be apparent that one or more exemplary embodiments may be practiced without these specific details. In other instances, well-known structures and apparatuses are illustrated to simplify the figures.

[0041] This embodiment provides a laser welding shielding gas assembly 1, such as... Figures 1-10 As shown, the laser welding shielding gas assembly 1, which guides the shielding gas to the nozzle 30 of the laser welding torch, is characterized in that it includes a central pipe 10, a distributor 20, and a nozzle 30. The central pipe 10 is used for the laser to pass through and for the corresponding first shielding gas to flow out through a first outlet 11 located thereon. The distributor 20 is sleeved on the outside of the central pipe 10 and has a second outlet 21 for the second shielding gas to flow out. The distributor 20 is sleeved inside the nozzle 30, and both the first outlet 11 and the second outlet 21 are located in the cavity of the nozzle 30. The flow rate of the first shielding gas is greater than the flow rate of the second shielding gas.

[0042] In this process, the first protective gas flows out from the central pipe 10 through the distributor 20 of the laser welding shielding gas assembly 1, and the second protective gas flows out from the second outlet 21 of the distributor 20. Since the second outlet 21 is located outside the first outlet 11, and the flow rate of the second protective gas is lower than that of the first protective gas, the first protective gas cannot remain at the weld for an extended period after flowing out of the central pipe 10. However, the lower flow rate of the second protective gas allows it to remain at the weld for a longer time than the first protective gas, thus extending the protection time for the weld. Overall, the first and second protective gases increase the residence time of the shielding gas at the weld. This increased residence time prevents the weld from oxidizing with the surrounding air under the protective atmosphere, improving the welding effect and the structural strength of the weld. Compared to existing technologies, by increasing the outflow time of the shielding gas, the use of a first shielding gas and a second shielding gas in a stratified flow reduces the overall amount of shielding gas used in the weld during the welding process, thereby reducing welding costs.

[0043] In one exemplary embodiment, the distance between the first gas outlet 11 and the weldment corresponding to the nozzle 30 is greater than the distance between the second gas outlet 21 and the weldment corresponding to the nozzle 30. This allows a higher gas flow rate at the first gas outlet 11 to form a protective gas curtain between the first gas outlet 11 and the weld, preventing the weld from oxidizing with air during the welding process. The larger distance between the second protective gas and the weld allows for longer-lasting protection on the weld surface after welding, preventing oxidation during cooling and improving weld quality. Furthermore, the second protective gas is positioned around the first protective gas, forming a gas curtain with the weld, further enhancing the weld quality.

[0044] The first and second protective airflows create positive pressure within the laser's light-transmitting channel, preventing dust and splashes from entering and protecting the laser channel. The central duct 10 allows both the laser and the first protective airflow to pass through, preventing splashes from entering and also preventing splashes from affecting the air curtain formed by the first protective airflow.

[0045] Furthermore, the distributor 20 is provided with a diffuser 22 near the second outlet end 21, which reduces the flow velocity of the second protective gas after it passes through the diffuser 22. By providing the diffuser 22, the flow velocity of the protective gas flowing out from the second outlet end 21 is reduced, thereby reducing the amount of protective gas used while forming an air curtain to protect the weld, thus reducing the cost of weld welding.

[0046] Specifically, the diffuser 22 can be an air filter 221. The air filter 221 can disperse the airflow entering the channel, allowing it to pass through evenly and avoiding excessively fast local airflow or turbulence, thereby improving the stability and efficiency of the gas flow. Furthermore, the air filter 221 can intercept solid particles, dust, or other impurities carried in the gas, preventing these impurities from entering subsequent equipment and causing blockages or damage, thus playing a preliminary role in purifying the gas. The diffuser 22 can also have a multi-layered mesh structure, with each layer being a different type of filter layer used to form a stable second protective gas flow.

[0047] The laser welding shielding gas assembly 1 also includes an outer pipe 40, which is sleeved outside the central pipe 10. A second flow channel 41 is provided between the central pipe 10 and the outer pipe 40 for the flow of the second shielding gas. The second flow channel 41 allows the second shielding gas to work synergistically with the first shielding gas in the central pipe 10 to jointly protect the weld. The flowing first shielding gas acts directly on the weld pool, while the flowing second shielding gas in the outer layer can form an "air curtain" around the perimeter, expanding the protection area. The dual airflow design of the first and second shielding gases can more effectively remove air and reduce gas disturbance in the welding area.

[0048] In one exemplary embodiment, the cross-section of the central pipe 10 is a regular polygon with three or more sides. The gap between the outer side of the regular polygon and the outer pipe 40 forms a second flow channel 41. For example, the cross-section of the central pipe 10 can be a regular hexagon, octagon, or dodecagon, with a gap between the aforementioned three regular polygons and the outer pipe 40. Furthermore, this gap can also be an irregular shape, with a fan-shaped cross-section, or the second flow channel 41 can be a spiral flow channel. This gap can be used for the flow of a second protective gas. The more sides the polygon has, the better the uniformity of the gas flow between the central pipe 10 and the outer pipe 40.

[0049] In this embodiment, a plurality of grooves 42 are provided on the outer side of the central pipe 10, and the extending direction of the grooves 42 is parallel to the axis of the central pipe 10. The number of grooves 42 is not limited, and there can be one or two grooves 42, as long as it can satisfy the flow of the second protective gas between the central pipe 10 and the outer pipe 40.

[0050] In this design, one end of the splitter 20 is sealed to the outer pipe 40, while the other end of the splitter 20 can be either sealed to the central pipe 10 or not. The sealed connection between the splitter 20 and both the central pipe 10 and the outer pipe 40 ensures that the first protective gas flowing in the central pipe 10 and the second protective gas flowing in the outer pipe 40 are completely separated at the source. This allows for independent and precise control of both the first and second protective gas flows. Alternatively, the other end of the splitter 20 can be unsealed to the central pipe 10, allowing for a dual-layer gas flow from both the first outlet 11 of the central pipe 10 and the second outlet 21 of the outer pipe 40, while reducing the cost of a sealed connection.

[0051] The connection between the outer pipe 40 and the central pipe 10 within the fixed base 60, i.e., at the end furthest from the distributor 20, is sealed. This allows the gas flowing into the distributor 70 from the source to be transmitted through the central pipe 10 and the outer pipe 40 and then exit through the first outlet 11 and the second outlet 21, reducing gas leakage and thus reducing the amount of protective gas used and lowering welding costs.

[0052] Specifically, the distributor 20 has a distribution channel 23. One end of the distribution channel 23 is connected to the second outlet end 21, and the other end of the distribution channel 23 is connected to the stepped section 50 formed by the central pipe 10 and the outer channel. This ensures that the second protective airflow can form a perfect annular air curtain with the lowest energy loss, the highest uniformity and stability, and work in coordination with the central airflow to create an extremely reliable oxygen-free protective environment around the laser welding pool. This prevents the weld from being oxidized during the welding process and results in higher weld consistency.

[0053] In this embodiment, the laser welding shielding gas assembly 1 further includes a fixing seat 60. The fixing seat 60 is disposed outside the outer layer pipe 40, and the fixing seat 60 and the nozzle 30 are respectively disposed at both ends of the outer layer pipe 40. The fixing seat 60 has an internal channel 61 and a central channel 62. The central channel 62 and the internal channel 61 are independent of each other. The central channel 62 is connected to the first gas outlet 11, and the internal channel 61 is connected to the second flow channel 41. This physical isolation design ensures that the first shielding gas flow and the second shielding gas flow remain independent of each other during the flow process.

[0054] In this design, at the connection between the fixed base 60 and the outer pipe 40, the outer pipe 40 is provided with a first connecting hole 43. Along the axial direction of the outer pipe 40, both ends of the first connecting hole 43 are sealed at their connections with the fixed base 60. This airflow path sealing design prevents cross-contamination between the first and second protective airflows, ensuring 100% effective utilization of the second protective gas, reducing the amount of protective gas used, and thus lowering welding costs.

[0055] In this embodiment, the laser welding shielding gas assembly 1 further includes a flow divider 70, which has a first channel 71 and a second channel 72. The flow divider ring also has a front end 73 and a rear end 74 along the gas flow direction. The first channel 71 and the second channel 72 are interconnected at the front end 73 of the flow divider 70. At the rear end 74 of the flow divider 70, the first channel 71 is interconnected with the central channel 62, and the second channel 72 is interconnected with the internal channel 61. The flow divider 70 causes the first shielding gas flow and the second shielding gas flow to separate after interaction in the initial stage, ensuring that the first shielding gas flow and the second shielding gas flow from the first outlet end 11 and the second outlet end 21 are uniform and stable, so that the first shielding gas flow and the second shielding gas flow form a stable protective body during weld welding.

[0056] The fixed base 60 has an end face annular groove 63, and the diverter 70 is embedded in the end face annular groove 63. The hole at the end face annular groove 63 connects to the second channel 72 of the diverter 70. The end face annular groove 63 can simultaneously fix one end of the diverter 70 therein, and simultaneously allow the second protective airflow flowing out of the second channel 72 of the diverter 70 to enter the end face annular groove 63 and flow out from the internal channel 61 of the fixed base 60. The diversion design of the diverter 70 and the fixed base 60 reduces the space occupied by the central conduit and the outer conduit for conveying the first and second protective airflows respectively, so that the second and first protective airflows can pass smoothly through the air screen 221 and the filter 101 located in the central channel 62.

[0057] Specifically, the diverter 70 has a hollow cylindrical structure with two cylindrical sections of different outer diameters. The outer diameter of the front end 73 is smaller than that of the rear end 74. The second channel 72 is located inside the rear end 74, and the inner wall of the front end 73 has a second connecting hole 75 that connects to the hollow section. The second connecting hole 75 allows the first protective airflow and the second protective airflow to have the same initial airflow. After being diverted by the second connecting hole 75, the first protective airflow and the second protective airflow flow to the first outlet end 11 and the second outlet end 21 through separate channels, respectively.

[0058] This embodiment also provides a laser welding torch, which includes the laser welding shielding gas assembly 1 as described above. Through the distributor 20 of the laser welding shielding gas assembly 1, a first shielding gas flows out from the central pipe 10, and a second shielding gas flows out from the second outlet 21 of the distributor 20. Since the second outlet 21 is located outside the first outlet 11, and the flow rate of the second shielding gas is less than that of the first shielding gas, the first shielding gas cannot remain at the weld for a long time after flowing out of the central pipe 10. However, the lower flow rate of the second shielding gas allows it to remain at the weld for a longer period than the first shielding gas, thus extending the protection time for the weld. Overall, the first and second shielding gases increase the residence time of the shielding gas at the weld. This increased residence time prevents the weld from oxidizing with the surrounding air under the protective atmosphere of the shielding gas, improving the welding effect and the structural strength of the weld.

[0059] In this embodiment, the laser welding torch also includes a torch body 80. An airflow flows into the torch body 80. The torch body 80 is sealed to a flow divider 70 of the laser welding shielding gas assembly 1. The shielding gas entering the flow divider 70 is diverted through the first channel 71 and the second channel 72, flowing to the first outlet 11 and the second outlet 21 respectively. When the nozzle 30 is worn or the airflow channel needs cleaning, the entire laser welding shielding gas assembly 1 can be easily removed from the torch body 80 for replacement or maintenance, facilitating future maintenance.

[0060] Furthermore, in this embodiment, the welding torch body 80 and the flow divider 70 are sealed together by a seal disposed inside the flow divider 70. The mounting base 60 and the flow divider 70 are also sealed together by a sealing groove disposed on the rear end 74 of the flow divider 70. This ensures that the first protective airflow and the second protective airflow remain independent of each other after being diverted by the flow divider 70.

[0061] In this embodiment, the laser emission aperture is equipped with a metal mesh, forming a light transmission channel that perfectly matches the laser beam upon initial use, minimizing the entry of fumes and spatter into the welding torch. The laser penetrates the filter 101 inside the nozzle 30 connecting tube, forming a light transmission notch that perfectly matches the beam's oscillation trajectory and size. This notch is only 1 / 10 the size of existing technologies, significantly preventing welding fumes and spatter from entering the welding torch and contaminating the protective lens. A dust cap 102 is provided at the port of the first exhaust end 11 of the central pipe 10, fixing the filter 101 to the first exhaust end 11 of the central pipe 10.

[0062] Although the invention has been described foregoing in conjunction with exemplary embodiments, various alternatives, modifications, variations, improvements, and / or substantially equivalents, whether known or currently or soon to be foreseen, will likely be apparent to those skilled in the art. Furthermore, the technical effects and / or technical problems described in this invention are exemplary and not limiting; therefore, the technical content of this invention may be used to solve other technical problems and have other technical effects. Accordingly, the exemplary embodiments of the invention described above are intended to be illustrative rather than restrictive. Various changes may be made without departing from the spirit or scope of the invention. The solutions described in the various exemplary embodiments can be freely combined without causing structural or principled conflicts. The scope of protection of this invention is defined by the claims and their equivalents.

Claims

1. A laser welding shielding gas assembly (1) for guiding shielding gas to the nozzle (30) of a laser welding torch, characterized in that, The laser welding shielding gas assembly (1) includes: A central conduit (10) is provided for the laser to pass through and for the corresponding first protective gas flow to exit through a first outlet (11) located thereon; A flow divider (20) is sleeved on the outside of the central duct (10), and the flow divider (20) has a second outlet (21) for discharging a second protective gas flow; and The nozzle (30) is fitted inside the nozzle (30), and the first outlet end (11) and the second outlet end (21) are both located in the cavity of the nozzle (30). The flow rate of the first protective gas is greater than the flow rate of the second protective gas.

2. The laser welding shielding gas assembly (1) as described in claim 1, characterized in that, The distance between the first air outlet (11) and the weldment corresponding to the nozzle (30) is greater than the distance between the second air outlet (21) and the weldment corresponding to the nozzle (30).

3. The laser welding shielding gas assembly (1) as described in claim 1 or 2, characterized in that, The splitter (20) is provided with a diffuser (22) near the second outlet (21), and the second protective airflow can reduce its velocity after passing through the diffuser (22).

4. The laser welding shielding gas assembly (1) as described in claim 3, characterized in that, The diffuser (22) is an air screen (221).

5. The laser welding shielding gas assembly (1) as described in claim 1, characterized in that, The laser welding protective gas assembly (1) also includes an outer pipe (40), which is sleeved on the outside of the central pipe (10). A second flow channel (41) is provided between the central pipe (10) and the outer pipe (40), and the second flow channel (41) is used for the flow of the second protective gas.

6. The laser welding shielding gas assembly (1) as described in claim 5, characterized in that, The cross-section of the central pipe (10) is a regular polygon with three or more sides. The gap between the outer side of the regular polygon and the outer pipe (40) forms the second flow channel (41); or, at least one groove (42) is provided on the outer side of the central pipe (10), and the extension direction of the groove (42) is parallel to the axis of the central pipe (10).

7. The laser welding shielding gas assembly (1) as described in claim 5 or 6, characterized in that, The end of the diverter (20) that is connected to the outer pipe (40) is sealed; and / or, The outer pipe (40) and the central pipe (10) are sealed together at the end away from the distributor (20).

8. The laser welding shielding gas assembly (1) as described in claim 7, characterized in that, The distributor (20) has a diversion channel (23), one end of which is connected to the second outlet (21), and the other end of which is connected to the stepped section (50) formed by the central pipe (10) and the outer channel.

9. The laser welding shielding gas assembly (1) as described in claim 5 or 6, characterized in that, The laser welding shielding gas assembly (1) also includes a fixing seat (60), which is located on the outside of the outer pipe (40) and the fixing seat (60) and the nozzle (30) are respectively located at both ends of the outer pipe (40). The fixing seat (60) has an internal channel (61) and a central channel (62). The central channel (62) and the internal channel (61) are independent of each other. The central channel (62) is connected to the first gas outlet (11), and the internal channel (61) is connected to the second flow channel (41).

10. The laser welding shielding gas assembly (1) as described in claim 9, characterized in that, At the connection between the fixed seat (60) and the outer pipe (40), the outer pipe (40) is provided with a first connecting hole (43). Along the axial direction of the outer pipe (40), the connection between the front and rear ends of the first connecting hole (43) and the fixed seat (60) is provided with a seal.

11. The laser welding shielding gas assembly (1) as described in claim 9, characterized in that, The laser welding shielding gas assembly (1) further includes a flow divider (70), which has a first channel (71) and a second channel (72). The flow divider ring also has a front end (73) and a rear end (74) along the gas flow direction. The first channel (71) and the second channel (72) are interconnected at the front end (73) of the flow divider (70). Wherein, at the rear end (74) of the diverter (70), the first channel (71) is connected to the central channel (62), and the second channel (72) is connected to the internal channel (61).

12. The laser welding shielding gas assembly (1) as described in claim 11, characterized in that, The fixed base (60) has an end face annular groove (63), the diverter (70) is embedded in the end face annular groove (63), and the hole at the end face annular groove (63) is connected to the second channel (72) of the diverter (70).

13. The laser welding shielding gas assembly (1) as described in claim 11, characterized in that, The diverter (70) has a hollow cylindrical structure with two cylindrical sections of different outer diameters. The outer diameter of the front end (73) is smaller than that of the rear end (74). The second channel (72) is located inside the rear end (74). The inner wall of the front end (73) is provided with a second connecting hole (75) that connects to the hollow part.

14. A laser welding torch, characterized in that, The laser welding gun includes a laser welding shielding gas assembly (1) as described in any one of claims 1-13.

15. The laser welding gun as described in claim 14, characterized in that, The laser welding gun also includes a welding gun body (80), which is sealed to the flow divider (70) of the laser welding shielding gas assembly (1). The shielding gas entering the flow divider (70) flows to the first outlet (11) and the second outlet (21) respectively after being divided by the first channel (71) and the second channel (72).

16. The laser welding gun as described in claim 14, characterized in that, A filter (101) is provided inside the central pipe (10), and the laser passes through the filter (101) to form a light-transmitting gap that conforms to the trajectory and size of the beam swing.

Images