Hand-held laser welding torch and laser processing apparatus

Abstract

The utility model relates to laser welding technical field discloses a handheld laser welding torch and laser processing equipment. Wherein handheld laser welding torch includes the gun body and the nozzle, is provided with first gas cavity and second gas cavity in the gun body, the nozzle is connected in the gun body, the nozzle is provided with first spout and second spout at intervals on, first spout is linked together with first gas cavity, second spout is linked together with second gas cavity, first gas cavity is used for providing containing space for low concentration nitrogen gas and can guide low concentration nitrogen gas from first spout export to the outside of gun body, second gas cavity is used for providing containing space for high concentration nitrogen gas and can guide high concentration nitrogen gas from second spout export to the outside of gun body, still be provided with light outlet channel in the gun body, light outlet channel is used for guiding laser beam from first spout export to the outside of gun body. The utility model has higher resource utilization, and welding effect is better simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of laser welding technology, and in particular to a handheld laser welding gun and laser processing equipment. Background Technology

[0002] Handheld laser welding torches require protection with inert gas during the welding process. Nitrogen is typically used to protect the welded area to slow down oxidation in the air and improve welding quality.

[0003] To ensure a bright white weld, the welding process requires a large amount of nitrogen, typically necessitating the use of additional nitrogen cylinders in laser welding equipment. However, the high nitrogen consumption during welding leads to frequent cylinder replacements. While connecting to a large nitrogen generator is an option, it increases the equipment's size, making it inconvenient for mobile operations and hindering usability. Therefore, some small integrated lasers incorporate a nitrogen generator. This generator separates air into high-concentration and low-concentration nitrogen gases. For example, 15L of air can produce 3L of high-concentration nitrogen and 12L of low-concentration nitrogen. The separated low-concentration nitrogen is usually released directly into the air, without effective utilization. Most handheld laser welding guns on the market use single-channel or dual-channel split-flow gas outputs, with single-channel outputs offering poor protection for the welded area. The dual-channel split-flow gas output achieves high-concentration nitrogen gas output through two outlets on the handheld laser welding torch nozzle. Part of the nitrogen flows along the same path as the laser beam to prevent welding slag from entering the output channel and damaging the protective lens, while the other part is applied to the already welded area to protect the weld. However, when using the split high-concentration nitrogen to protect the already welded area, the reduced gas volume leads to a poorer protective effect, and the welded area is prone to blackening due to oxidation.

[0004] Therefore, there is an urgent need for a handheld laser welding gun and laser processing equipment to solve the above problems. Utility Model Content

[0005] Based on the above, the purpose of this utility model is to provide a handheld laser welding gun and laser processing equipment, which has higher resource utilization and better welding effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Handheld laser welding gun, including:

[0008] The gun body has a first air chamber and a second air chamber.

[0009] The nozzle is connected to the gun body, and a first nozzle and a second nozzle are provided at intervals on the nozzle. The first nozzle is in communication with the first air chamber, and the second nozzle is in communication with the second air chamber.

[0010] The first gas chamber is used to provide a space for low-concentration nitrogen gas and can guide the low-concentration nitrogen gas to be output from the first nozzle to the outside of the gun body. The second gas chamber is used to provide a space for high-concentration nitrogen gas and can guide the high-concentration nitrogen gas to be output from the second nozzle to the outside of the gun body. The gun body is also provided with a light emission channel, which is used to guide the laser beam to be output from the first nozzle to the outside of the gun body.

[0011] As a preferred embodiment of a handheld laser welding gun, the handheld laser welding gun further includes an inner tube disposed within the gun body, wherein a first air chamber is formed within the inner tube, and a second air chamber is formed by the outer wall of the inner tube and a portion of the inner wall of the gun body.

[0012] As a preferred embodiment of a handheld laser welding gun, the outer wall of the inner tube and the inner wall of the gun body are at least partially sealed together to isolate the first air chamber and the second air chamber.

[0013] As a preferred embodiment of a handheld laser welding gun, the inner tube is provided with a connecting hole, which is connected to the first gas chamber. The connecting hole can be used to allow low-concentration nitrogen gas to enter the first gas chamber.

[0014] As a preferred embodiment of the handheld laser welding gun, the handheld laser welding gun further includes a connector that communicates with the second gas chamber and can be used to supply high-concentration nitrogen gas into the second gas chamber.

[0015] As a preferred embodiment of a handheld laser welding gun, the handheld laser welding gun further includes a connector, one end of which is connected to the nozzle and the other end of which is connected to the gun body. The connector is provided with a first outlet and a second outlet. The first nozzle is connected to the first gas chamber through the first outlet, and the second nozzle is connected to the second gas chamber through the second outlet.

[0016] As a preferred embodiment of a handheld laser welding gun, the connection position between the connector and the gun body can be shifted along the axial direction of the light output channel to change the distance between the nozzle and the laser beam focal point.

[0017] As a preferred embodiment of a handheld laser welding gun, the handheld laser welding gun further includes a connecting tube, one end of which is connected to the inner tube, and the other end of which is connected to the connector. The first outlet and the first gas chamber are connected through the connecting tube.

[0018] The connecting tube is sleeved with the connecting piece, and the connection position of the connecting tube and the connecting piece can be translated along the axial direction of the light output channel to change the distance between the nozzle and the laser beam focal point.

[0019] As a preferred embodiment of a handheld laser welding gun, the first air cavity is connected to the light emission channel.

[0020] A laser processing device, comprising a handheld laser welding gun as described in any of the above embodiments.

[0021] The beneficial effects of this utility model are as follows:

[0022] This invention features an interconnected gun body and nozzle, allowing a laser beam and low-concentration nitrogen gas from the first gas chamber to be ejected through the first nozzle for welding. High-concentration nitrogen gas from the second gas chamber is ejected through the second nozzle to protect the welded area of ​​the workpiece. Specifically, a light-emitting channel guides the laser beam from the first nozzle to the outside of the gun body. Simultaneously, the first gas chamber provides space for the low-concentration nitrogen gas generated by the nitrogen generator and guides it from the first nozzle to the outside of the gun body. This ensures that the low-concentration nitrogen gas, along with the laser beam, exits from the gun body through the first nozzle, effectively preventing welding slag from entering the light-emitting channel and damaging the optical components of the laser unit. In other words, the low-concentration nitrogen gas serves as the primary protective gas for the laser unit's optical components, making full use of resources and extending the lifespan of the internal optical components of the handheld laser welding gun. Meanwhile, the gun body is also equipped with a second gas chamber. This second gas chamber provides space to accommodate the high-concentration nitrogen gas generated by the nitrogen generator and guides the high-concentration nitrogen gas to be output from the second nozzle to the outside of the gun body. The high-concentration nitrogen gas is used as a second protective gas to blow gas onto the welded area and slow down oxidation. Because the low-concentration nitrogen gas generated by the nitrogen generator is used as the first protective gas, the amount of the second protective gas is relatively increased, thus providing better protection for the welded area and improving welding quality. Moreover, less nitrogen is required to maintain the same welding quality, making it more energy-efficient. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a handheld laser welding gun provided in a specific embodiment of this utility model;

[0025] Figure 2This is a partial cross-sectional view of the handheld laser welding gun provided in a specific embodiment of the present invention. Figure 1 ;

[0026] Figure 3 This is a partial cross-sectional view of the handheld laser welding gun provided in a specific embodiment of the present invention. Figure 2 .

[0027] In the picture:

[0028] 100. Gun body; 101. First gas chamber; 102. Second gas chamber; 110. Gun mount; 120. Gun barrel; 121. Connector; 130. Fixing component;

[0029] 210. Low-concentration nitrogen gas transmission pipeline;

[0030] 310. Light channel;

[0031] 400. Inner tube; 410. Sealing ring; 420. Connecting hole; 430. Connecting pipe;

[0032] 500, Nozzle; 510, First nozzle; 520, Second nozzle; 530, Third nozzle;

[0033] 600. Connector; 610. First outlet; 620. Second outlet; 630. Sealing cavity;

[0034] 700. Wire feeding tube. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0036] 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., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0037] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between 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.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] like Figures 1-3 As shown, this embodiment provides a handheld laser welding gun, which includes a gun body 100 and a nozzle 500. The gun body 100 has a first gas chamber 101 and a second gas chamber 102. The nozzle 500 is connected to the gun body 100, and a first nozzle 510 and a second nozzle 520 are spaced apart on the nozzle 500. The first nozzle 510 communicates with the first gas chamber 101, and the second nozzle 520 communicates with the second gas chamber 102. The first gas chamber 101 provides space for low-concentration nitrogen gas and guides the low-concentration nitrogen gas from the first nozzle 510 to the outside of the gun body 100. The second gas chamber 102 provides space for high-concentration nitrogen gas and guides the high-concentration nitrogen gas from the second nozzle 520 to the outside of the gun body 100. A light emission channel 310 is also provided inside the gun body 100, which guides the laser beam from the first nozzle 510 to the outside of the gun body 100.

[0041] By configuring the interconnected gun body 100 and nozzle 500, the laser beam and low-concentration nitrogen gas in the first gas chamber 101 are ejected through the first nozzle 510 for welding. The high-concentration nitrogen gas in the second gas chamber 102 is ejected through the second nozzle 520 to protect the welded area of ​​the workpiece. Specifically, by configuring the light output channel 310, the laser beam is guided from the first nozzle 510 to the outside of the gun body 100. At the same time, the first gas chamber 101 can provide a space for the low-concentration nitrogen gas generated by the nitrogen generator and can guide the low-concentration nitrogen gas from the first nozzle 510 to the outside of the gun body 100. This allows the low-concentration nitrogen gas and the laser beam to be output from the first nozzle 510 from inside the gun body 100, effectively preventing welding slag from entering the light output channel 310 and damaging the optical components of the laser unit. In other words, the low-concentration nitrogen gas serves as the first protective gas for the optical components of the laser unit, making full use of resources and helping to extend the service life of the internal optical components of the handheld laser welding gun. Meanwhile, the gun body 100 is also provided with a second gas chamber 102. The second gas chamber 102 is used to provide a space for the high-concentration nitrogen gas generated by the nitrogen generator and can guide the high-concentration nitrogen gas from the second nozzle 520 to the outside of the gun body 100, so that the high-concentration nitrogen gas can completely enter the second gas chamber 102 to serve as a second protective gas for blowing protection on the welded area of ​​the workpiece, thereby slowing down the oxidation of the welded area of ​​the workpiece. Since the low-concentration nitrogen gas generated by the nitrogen generator is used as the first protective gas, the amount of the second protective gas is guaranteed, thereby improving the protection of the welded area of ​​the workpiece and improving the welding quality; and under the premise of ensuring the same welding quality, less nitrogen is required, thus making it more energy-efficient.

[0042] Specifically, the first gas chamber 101 is coaxially connected to the light output channel 310. By connecting the first gas chamber 101 inside the gun body 100 to the light output channel 310, the output direction of the low-concentration nitrogen gas when it is output to the outside of the gun body 100 is the same as the axial direction of the light output channel 310. This allows the low-concentration nitrogen gas to flow in the light output channel 310 and be output from the gun body 100 along the same path as the laser beam, so as to more effectively prevent the welding slag generated by welding from entering the light output channel 310 and damaging the optical components of the laser unit.

[0043] It is worth noting that the handheld laser welding gun is also equipped with a laser unit for outputting a laser beam in the output channel 310. Understandably, the optical components of the laser unit include, but are not limited to, a laser output head, collimating lens group, reflecting mirror group, focusing lens group, and protective lens group, to correspondingly achieve laser output, collimation, reflection, focusing, and protection. The protective function of the first protective gas refers to its protective effect on one or more of the above-mentioned components. Additionally, low-concentration nitrogen and high-concentration nitrogen can be generated by a nitrogen generator unit, such as a nitrogen generator. Low-concentration nitrogen can originate from the exhaust gas produced after nitrogen generation in the nitrogen generator, while high-concentration nitrogen can originate from the nitrogen output of the nitrogen generator. The specific concentrations corresponding to high-concentration and low-concentration nitrogen are not limited; the high and low concentrations are determined based on actual needs and the power of the nitrogen generator. The nitrogen generator unit can be a nitrogen generator independent of the gun body 100 or integrated into the gun body 100. When the nitrogen generator unit is integrated into the gun body 100, the handheld laser welding gun is smaller and more convenient for mobile operation, i.e., miniaturization and higher integration.

[0044] Specifically, the first nozzle 510 and the second nozzle 520 of the nozzle 500 are arranged longitudinally along the welding path, and the second nozzle 520 is located on the side of the first nozzle 510 away from the weldment.

[0045] Furthermore, the handheld laser welding gun also includes an inner tube 400, which is disposed within the gun body 100. Specifically, by providing the inner tube 400, a first air chamber 101 is formed within the inner tube 400, and a second air chamber 102 is formed by the outer wall of the inner tube 400 and the inner wall of the gun body 100. Exemplarily, the inner tube 400 is detachably disposed within the gun body 100, including but not limited to snap-fit ​​and sleeve connection. The inner tube 400 and the light emission channel 310 are coaxially arranged.

[0046] As an optional solution for the handheld laser welding gun, specifically, the gun body 100 includes a gun base 110 and a gun barrel 120. One end of the gun base 110 is connected to the nozzle 500, and the other end is connected to the nozzle 500. The gun base 110 is coaxially arranged with the inner tube 400. To introduce high-concentration nitrogen into the second gas chamber 102, the handheld laser welding gun also includes a connector 121. The connector 121 is connected to the gun barrel 120 and communicates with the second gas chamber 102. The connector 121 can be used to allow high-concentration nitrogen to enter the second gas chamber 102. Exemplarily, the other end of the connector 121 can be connected to the nitrogen outlet of the nitrogen generation unit. Specifically, the connector 121 can be connected to the nitrogen outlet through a gas pipe for the delivery of high-concentration nitrogen.

[0047] Optionally, the gun body 100 is also provided with a fastener 130 for connecting the barrel 120 and the gun base 110. For example, the end of the barrel 120 away from the nozzle 500 can be inserted into the gun base 110, and the fastener 130 can connect the barrel 120 and the gun base 110 by means of threaded locking, which is convenient and reliable.

[0048] In this embodiment, the handheld laser welding gun is provided with a light-emitting end, which is the end provided with a nozzle 500. The outer wall of the inner tube 400 and the inner wall of the gun body 100 are at least partially sealed to isolate the first gas chamber 101 and the second gas chamber 102. This effectively avoids the conduction and mixing between low-concentration nitrogen gas and high-concentration nitrogen gas, which would affect the concentration of nitrogen gas in the two gas chambers and thus lead to a reduction or even failure of the protective effect.

[0049] Furthermore, the inner tube 400 is provided with a connecting hole 420, which is connected to the first gas chamber 101. The connection hole 420 enables low-concentration nitrogen gas to enter the first gas chamber 101 under the premise that the outer wall of the inner tube 400 and the inner wall of the gun body 100 are at least partially sealed.

[0050] For example, the inner tube 400 has a connecting hole 420 at the end away from the nozzle 500 at the sealed connection position. It is understood that an annular chamber is also formed between the inner tube 400 at the side away from the nozzle 500 and the inner wall of the gun body 100, where low-concentration nitrogen gas first enters the annular chamber and then enters the first gas chamber 101 through the connecting hole 420. Preferably, there are two or more connecting holes 420, which are evenly spaced along the circumference of the inner tube 400. The second gas chamber 102 is located between the inner tube 400 at the side near the nozzle 500 and the inner wall of the gun body 100.

[0051] Specifically, to isolate the first gas chamber 101 and the second gas chamber 102 from each other, the handheld laser welding gun also includes a sealing ring 410. The sealing ring 410 is used to seal the outer wall of the inner tube 400 and the inner wall of the gun body 100 at the sealing connection position. It can be understood that the sealing ring 410 is annular, which provides a better sealing effect. A low-concentration nitrogen gas supply pipe 210 is also provided inside the gun body 100. One end of the low-concentration nitrogen gas supply pipe 210 is connected to the outer side of the end of the sealing ring 410 away from the nozzle 500, and the other end is connected to the low-concentration nitrogen gas outlet of the nitrogen generation unit, so as to allow low-concentration nitrogen gas to enter the first gas chamber 101.

[0052] Preferably, the handheld laser welding gun further includes a connector 600, which is connected to the gun body 100. The connector 600 is provided with a first outlet 610 and a second outlet 620, wherein the first outlet 610 is connected to the first gas chamber 101 and can be used for the flow of low-concentration nitrogen gas; the second outlet 620 is connected to the second gas chamber 102 and can be used for the flow of high-concentration nitrogen gas.

[0053] Furthermore, the end of the connector 600 furthest from the gun body 100 is connected to the nozzle 500, the end of the first outlet 610 furthest from the first gas chamber 101 is connected to the first nozzle 510, and the end of the second outlet 620 furthest from the second gas chamber 102 is connected to the second nozzle 520. That is, the first nozzle 510 and the first gas chamber 101 are connected through the first outlet 610, allowing low-concentration nitrogen gas to... Figure 3 The solid line and arrow indicate the direction of flow along the first gas chamber 101, the first outlet 610, and the first nozzle 510; the second nozzle 520 is connected to the second gas chamber 102 through the second outlet 620, and high-concentration nitrogen gas can flow as... Figure 3 The air flows along the second air chamber 102, the second outlet 620, and the second nozzle 520, as indicated by the dashed line and arrow.

[0054] Specifically, the connector 600 is adjustable relative to the gun body 100 along the axial direction of the light emission channel 310. That is, the connection position between the connector 600 and the gun body 100 can be shifted along the axial direction of the light emission channel 310 to change the distance between the nozzle 500 and the laser beam focal point. By adjusting the distance between the nozzle 500 and the gun body 100 through the connector 600, the distance between the focal point and the nozzle 500 can be adjusted to meet different welding requirements, thus expanding the applicability of the handheld laser welding gun.

[0055] In this embodiment, the handheld laser welding gun also includes a connecting tube 430. One end of the connecting tube 430 is connected to the inner tube 400, and the other end of the connecting tube 430 is connected to the connector 600. The first gas chamber 101 and the first outlet 610 are connected through the connecting tube 430. The connecting tube 430 can be used to isolate the first gas chamber 101 and the second gas chamber 102, thereby preventing cross-mixing between the first protective gas and the second protective gas and affecting the concentration of the second protective gas.

[0056] Furthermore, to achieve focusing, the connecting tube 430 and the connecting piece 600 are sleeved together, and the connection position of the connecting tube 430 and the connecting piece 600 can be translated along the axial direction of the light output channel 310 to change the distance between the nozzle 500 and the laser beam focal point. The sleeved connecting piece 600 and the connecting tube 430 are sealed and slidingly connected, which prevents the connection of nitrogen gases of different concentrations from occurring while achieving adjustment.

[0057] For example, the connector 600 is provided with a sealing cavity 630 communicating with the first outlet 610. The connecting pipe 430 is slidably connected to the sealing cavity 630 and is sealed to the inside of the sealing cavity 630. While ensuring a sealed connection, the relative position between the connector 600 and the connecting pipe 430 can be changed through sliding engagement, thereby achieving adjustment of the focus point. Preferably, the connecting pipe 430 and the inner pipe 400 are integrally formed, resulting in a more reliable connection and better sealing.

[0058] In this embodiment, the handheld laser welding gun is also equipped with a wire feed tube 700, and a third nozzle 530 is correspondingly provided on the nozzle 500. One end of the wire feed tube 700 is located inside the gun body 100, and the other end extends out from the gun holder 110 and communicates with the third nozzle 530 for supplying welding wire. It is worth noting that the first nozzle 510, the second nozzle 520, and the third nozzle 530 are located on the same straight line, and the third nozzle 530 is located at the end of the first nozzle 510 that is away from the second nozzle 520.

[0059] When the aforementioned handheld laser welding gun is in use, the laser beam passes sequentially through the inner tube 400, the first outlet 610, and the first nozzle 510 within the light output channel 310 before being output to the outside of the handheld laser welding gun. Low-concentration nitrogen gas from the nitrogen generation unit passes through the low-concentration nitrogen gas supply pipe 210, then sequentially through the annular chamber on the side of the sealing ring 410 away from the nozzle 500, the connecting hole 420, the inner tube 400, the first outlet 610, and the first nozzle 510 before being output to the outside of the handheld laser welding gun. High-concentration nitrogen gas from the nitrogen generation unit passes through the nitrogen outlet and the gas pipe opening, then sequentially through the connector 121 and the second gas chamber 102, and finally through the second outlet 620 and the second nozzle 520 before being output to the outside of the handheld laser welding gun. The welding wire is output to the outside of the handheld laser welding gun through the wire feed tube 700 and the third nozzle 530.

[0060] This embodiment also discloses a laser processing device, including a handheld laser welding gun as described in any of the above embodiments. The above-described laser processing device provides better welding results and higher resource utilization.

[0061] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A handheld laser welding gun, characterized in that, include: Gun body (100), wherein a first air chamber (101) and a second air chamber (102) are provided inside the gun body (100); A nozzle (500) is connected to the gun body (100). A first nozzle (510) and a second nozzle (520) are provided on the nozzle (500) at intervals. The first nozzle (510) is connected to the first air chamber (101), and the second nozzle (520) is connected to the second air chamber (102). The first gas chamber (101) is used to provide a space for low-concentration nitrogen gas and can guide the low-concentration nitrogen gas to be output from the first nozzle (510) to the outside of the gun body (100). The second gas chamber (102) is used to provide a space for high-concentration nitrogen gas and can guide the high-concentration nitrogen gas to be output from the second nozzle (520) to the outside of the gun body (100). A light-emitting channel (310) is also provided inside the gun body (100), and the light-emitting channel (310) is used to guide the laser beam to be output from the first nozzle (510) to the outside of the gun body (100).

2. The handheld laser welding gun according to claim 1, characterized in that, The handheld laser welding gun also includes an inner tube (400), which is disposed inside the gun body (100). The inner tube (400) forms the first air chamber (101), and the outer wall of the inner tube (400) and part of the inner wall of the gun body (100) form the second air chamber (102).

3. The handheld laser welding gun according to claim 2, characterized in that, The outer wall of the inner tube (400) and the inner wall of the gun body (100) are at least partially sealed together to isolate the first air chamber (101) and the second air chamber (102).

4. The handheld laser welding gun according to claim 2, characterized in that, The inner tube (400) is provided with a connecting hole (420), which is connected to the first gas chamber (101). The connecting hole (420) can be used to allow low-concentration nitrogen gas to enter the first gas chamber (101).

5. The handheld laser welding gun according to claim 1, characterized in that, The handheld laser welding gun also includes a connector (121) that is connected to the second gas chamber (102) and can be used to supply high-concentration nitrogen gas into the second gas chamber (102).

6. The handheld laser welding gun according to claim 2, characterized in that, The handheld laser welding gun also includes a connector (600), one end of which is connected to the nozzle (500) and the other end is connected to the gun body (100). The connector (600) is provided with a first outlet (610) and a second outlet (620). The first nozzle (510) is connected to the first gas chamber (101) through the first outlet (610), and the second nozzle (520) is connected to the second gas chamber (102) through the second outlet (620).

7. The handheld laser welding gun according to claim 6, characterized in that, The connection position of the connector (600) and the gun body (100) can be translated along the axial direction of the light output channel (310) to change the distance between the nozzle (500) and the laser beam focus.

8. The handheld laser welding gun according to claim 7, characterized in that, The handheld laser welding gun also includes a connecting tube (430), one end of which is connected to the inner tube (400), and the other end of which is connected to the connector (600). The first outlet (610) and the first air chamber (101) are connected through the connecting tube (430). The connecting tube (430) is sleeved with the connecting piece (600), and the connection position of the connecting tube (430) and the connecting piece (600) can be translated along the axial direction of the light output channel (310) to change the distance between the nozzle (500) and the laser beam focus.

9. The handheld laser welding gun according to any one of claims 1-8, characterized in that, The first air cavity (101) is coaxially connected to the light output channel (310).

10. A laser processing equipment, characterized in that, Including the handheld laser welding gun as described in any one of claims 1-9.

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