Handheld laser welding gun and laser processing equipment

Abstract

The invention relates to the technical field of laser welding, and discloses a handheld laser welding gun and laser processing equipment. The handheld laser welding gun comprises a gun body and a nozzle, a first air cavity and a second air cavity are formed in the gun body, the nozzle is connected to the gun body, a first spraying opening and a second spraying opening are formed in the nozzle in a spaced mode, the first spraying opening is communicated with the first air cavity, and the second spraying opening is communicated with the second air cavity. The first gas cavity is used for providing a containing space for low-concentration nitrogen and can guide the low-concentration nitrogen to be output to the outside of the gun body from the first nozzle, and the second gas cavity is used for providing a containing space for high-concentration nitrogen and can guide the high-concentration nitrogen to be output to the outside of the gun body from the second nozzle; a light outlet channel is further arranged in the gun body and used for guiding the laser beam to be output to the outside of the gun body from the first nozzle. The resource utilization rate is higher, and meanwhile the welding effect is better.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding, and in particular to a handheld laser welding gun and laser processing equipment. Background Art

[0002] Handheld laser welding guns need to be protected by inert gas during the welding process. Nitrogen is usually used to protect the welded area to slow down the oxidation of the welded area in the air and improve the welding quality.

[0003] To ensure bright white welds during the welding process, a large amount of nitrogen is required. Laser welding equipment usually needs to be equipped with additional nitrogen cylinders. However, the high nitrogen consumption during welding requires frequent replacement of nitrogen cylinders. A large nitrogen generator can also be connected, but this will increase the size of the equipment, making it inconvenient to move and operate, and its use remains unchanged. Therefore, some small integrated lasers have nitrogen generators integrated into them. During the nitrogen production process, the nitrogen generator separates the air into high-concentration nitrogen and low-concentration nitrogen. Taking 15L of air as an example, the nitrogen generator can produce 3L of high-concentration nitrogen and 12L of low-concentration nitrogen. The separated low-concentration nitrogen is usually discharged directly into the air and is not effectively utilized. Most handheld laser welding guns currently on the market have single-channel barrel outlets or dual-channel barrel split outlets. Single-channel barrel outlets are not very effective in protecting the welded area. Dual-channel split-flow gas discharge uses two outlets on the handheld laser welding gun nozzle to output high-concentration nitrogen. One portion of the gas flows along the laser beam to prevent welding slag from entering the beam path and damaging the protective lens, while the other portion is applied to the welded area to protect the weld. However, when using the split-flow high-concentration nitrogen to protect the welded area, the protective effect is reduced due to the reduced gas volume, 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. Summary of the Invention

[0005] Based on the above, the purpose of the present invention is to provide a handheld laser welding gun and laser processing equipment with higher resource utilization and better welding effect.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] Handheld laser welding gun, including:

[0008] A gun body, wherein a first air cavity and a second air cavity are provided in the gun body;

[0009] a nozzle connected to the gun body, the nozzle being provided with a first nozzle opening and a second nozzle opening at intervals, the first nozzle opening being communicated with the first air cavity, and the second nozzle opening being communicated with the second air cavity;

[0010] The first air cavity is used to provide a storage space for low-concentration nitrogen and can guide the low-concentration nitrogen to be output from the first nozzle to the outside of the gun body. The second air cavity is used to provide a storage space for high-concentration nitrogen and can guide the high-concentration nitrogen to be output from the second nozzle to the outside of the gun body. A light outlet channel is also provided in the gun body, and the light outlet channel 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 solution for the handheld laser welding gun, the handheld laser welding gun further includes an inner tube, which is arranged in the gun body, forming the first air cavity in the inner tube, and the outer wall of the inner tube and part of the inner wall of the gun body forming the second air cavity.

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

[0013] As a preferred solution for the handheld laser welding gun, a communicating hole is provided on the inner tube, and the communicating hole is connected to the first air cavity. The communicating hole can be used to allow low-concentration nitrogen gas to enter the first air cavity.

[0014] As a preferred solution of the handheld laser welding gun, the handheld laser welding gun further includes a joint, which is communicated with the second air cavity, and the joint can be used to supply high-concentration nitrogen gas into the second air cavity.

[0015] As a preferred solution for a handheld laser welding gun, the handheld laser welding gun also includes a connecting piece, one end of which is connected to the nozzle, and the other end is connected to the gun body, the connecting piece is provided with a first outlet and a second outlet, the first nozzle is connected to the first air cavity through the first outlet, and the second nozzle is connected to the second air cavity through the second outlet.

[0016] As a preferred solution for the handheld laser welding gun, the connection position between the connecting piece and the gun body can be translated along the axial direction of the light outlet channel to change the distance between the nozzle and the laser beam focus.

[0017] As a preferred solution of the handheld laser welding gun, the handheld laser welding gun further includes a connecting tube, one end of the connecting tube is connected to the inner tube, the other end of the connecting tube is connected to the connecting piece, and the first outlet and the first air cavity are connected through the connecting tube;

[0018] The connecting tube is sleeve-fitted with the connecting piece, and the connection position between the connecting tube and the connecting piece can be translated along the axial direction of the light outlet channel to change the distance between the nozzle and the laser beam focus.

[0019] As a preferred solution for the handheld laser welding gun, the first air cavity is communicated with the light output channel.

[0020] A laser processing device comprises a handheld laser welding gun as described in any of the above solutions.

[0021] The beneficial effects of the present invention are:

[0022] The present invention sets a gun body and a nozzle that are connected to each other, so that the laser beam and low-concentration nitrogen in the first air cavity are ejected through the first nozzle for welding. The high-concentration nitrogen in the second air cavity is ejected through the second nozzle to protect the welded area of ​​the workpiece. Specifically, by setting a light outlet channel, it is used to guide the laser beam to be output from the first nozzle to the outside of the gun body. At the same time, the first air cavity is used to provide a storage space for the low-concentration nitrogen generated by the nitrogen generator and can guide the low-concentration nitrogen to be output from the first nozzle to the outside of the gun body, so that the low-concentration nitrogen can be output from the gun body from the first nozzle together with the laser beam, so as to effectively prevent the welding slag generated by welding from entering the light outlet channel and damaging the optical components of the laser unit. That is, the low-concentration nitrogen is used as the first protective gas for the optical components of the laser unit, which makes full use of resources and also improves the service life of the optical components inside the handheld laser welding gun. The gun body also features a second air chamber, which accommodates the high-concentration nitrogen produced by the nitrogen generator and directs it out of the gun body through a second nozzle. This high-concentration nitrogen acts as a secondary shielding gas, providing protection and mitigating oxidation in the welded area. By using the low-concentration nitrogen produced by the nitrogen generator as the primary shielding gas, the amount of secondary shielding gas is increased, providing better protection for the welded area and improving weld quality. Furthermore, while maintaining the same weld quality, less nitrogen is required, resulting in greater energy savings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0024] Figure 1 is a schematic diagram of a handheld laser welding gun provided in a specific embodiment of the present invention;

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

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

[0027] In the picture:

[0028] 100, gun body; 101, first air chamber; 102, second air chamber; 110, gun mount; 120, gun barrel; 121, joint; 130, fixing member;

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

[0030] 310. Light channel;

[0031] 400, inner tube; 410, sealing ring; 420, communicating hole; 430, connecting tube;

[0032] 500, nozzle; 510, first nozzle; 520, second nozzle; 530, third nozzle;

[0033] 600, connecting piece; 610, first outlet; 620, second outlet; 630, sealed chamber;

[0034] 700. Wire feed tube. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. 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 or limited, the terms "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or removable connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0040] like Figure 1-Figure 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 is provided with a first air cavity 101 and a second air cavity 102. The nozzle 500 is connected to the gun body 100. The nozzle 500 is provided with a first nozzle 510 and a second nozzle 520 at intervals. The first nozzle 510 is connected to the first air cavity 101, and the second nozzle 520 is connected to the second air cavity 102. The first air cavity 101 is used to provide a storage 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 air cavity 102 is used to provide a storage 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. The gun body 100 is also provided with a light outlet channel 310, which is used to guide the laser beam from the first nozzle 510 to the outside of the gun body 100.

[0041] By setting up the interconnected gun body 100 and the nozzle 500, the laser beam and the low-concentration nitrogen in the first air cavity 101 are ejected through the first nozzle 510 for welding. The high-concentration nitrogen in the second air cavity 102 is ejected through the second nozzle 520 to protect the welded area of ​​the workpiece. Specifically, by setting up the light outlet channel 310, it is used to guide the laser beam from the first nozzle 510 to the outside of the gun body 100. At the same time, the first air cavity 101 can be used to provide a storage space for the low-concentration nitrogen generated by the nitrogen generator and can guide the low-concentration nitrogen from the first nozzle 510 to the outside of the gun body 100, so that the low-concentration nitrogen can be output from the gun body 100 together with the laser beam from the first nozzle 510, so as to effectively prevent the welding slag generated by welding from entering the light outlet channel 310 and damaging the optical components of the laser unit. That is, the low-concentration nitrogen is used as the first protective gas for the optical components of the laser unit, which makes full use of resources and is conducive to extending the service life of the optical components inside the handheld laser welding gun. The gun body 100 is also provided with a second air chamber 102, which is used to accommodate the high-concentration nitrogen gas produced by the nitrogen generator and guide the high-concentration nitrogen gas from the second nozzle 520 to the outside of the gun body 100. This allows the high-concentration nitrogen gas to fully enter the second air chamber 102, acting as a second shielding gas for blowing protection to the welded area of ​​the workpiece, thereby slowing down oxidation of the welded area. Since the low-concentration nitrogen gas produced by the nitrogen generator is used as the first shielding gas, the gas volume of the second shielding gas is guaranteed, thereby providing better protection for the welded area of ​​the workpiece and improving welding quality. Furthermore, while maintaining the same welding quality, less nitrogen production is required, resulting in greater energy savings.

[0042] Specifically, the first air cavity 101 is coaxially connected to the light output channel 310. By connecting the first air cavity 101 in the gun body 100 with the light output channel 310, the output direction of the low-concentration nitrogen gas when output to the outside of the gun body 100 is the same as the axial direction of the light output channel 310, so that the low-concentration nitrogen gas can 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 welding slag generated by welding from entering the light output channel 310 and damaging the optical devices of the laser unit.

[0043] It is worth noting that the handheld laser welding gun also includes a laser unit for outputting a laser beam in the light output channel 310. It is understood that the optical components of the laser unit include, but are not limited to, a laser output head, a collimating lens assembly, a reflecting lens assembly, a focusing lens assembly, and a protective lens assembly to achieve the corresponding output, collimation, reflection, focusing, and protection of the laser. The protective function of the first shielding gas refers to protecting one or more of the above. In addition, the low-concentration nitrogen and high-concentration nitrogen can be generated by a nitrogen generator, such as a nitrogen generator. The low-concentration nitrogen can be derived from the exhaust gas generated by the nitrogen generator, while the high-concentration nitrogen can be derived from the nitrogen output of the nitrogen generator. The specific concentrations of the high-concentration nitrogen 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 with the gun body 100, the handheld laser welding gun is smaller and more convenient for mobile operation, i.e., miniaturized and more integrated.

[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 a side of the first nozzle 510 away from the weldment.

[0045] Furthermore, the handheld laser welding gun includes an inner tube 400, which is disposed within the gun body 100. Specifically, the inner tube 400 forms a first air cavity 101 within the inner tube 400, and the outer wall of the inner tube 400 and the inner wall of the gun body 100 form a second air cavity 102. Exemplarily, the inner tube 400 can be removably mounted within the gun body 100, including but not limited to snap-fitting or sleeve-fitting. The inner tube 400 is coaxially disposed with the light output channel 310.

[0046] As an optional solution for a 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 gun base 110, and the other end is connected to the nozzle 500. The gun base 110 is coaxially arranged with the inner tube 400. In order to introduce high-concentration nitrogen into the second air cavity 102, the handheld laser welding gun also includes a connector 121, which is connected to the gun barrel 120 and communicates with the second air cavity 102. The connector 121 can be used to supply high-concentration nitrogen into the second air cavity 102. For example, the other end of the connector 121 can be connected to the nitrogen outlet of the nitrogen production unit. Specifically, the connector 121 can be connected to the nitrogen outlet through an air pipe for the delivery of high-concentration nitrogen.

[0047] Optionally, the gun body 100 is further provided with a fixing member 130, which is used to connect the gun barrel 120 and the gun base 110. For example, the end of the gun barrel 120 away from the nozzle 500 can be inserted into the gun base 110, and the fixing member 130 can connect the gun barrel 120 and the gun base 110 by screw locking, which is convenient and reliable.

[0048] In this embodiment, the handheld laser welding gun is provided with a light emitting end, which is an 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 and connected to isolate the first air cavity 101 and the second air cavity 102, effectively avoiding the conduction and mixing between low-concentration nitrogen and high-concentration nitrogen, affecting the concentration of nitrogen in the two air cavities, and thus causing the protection effect to be reduced or even fail.

[0049] Furthermore, a connecting hole 420 is provided on the inner tube 400, which is connected to the first air cavity 101. The setting of the connecting hole 420 can allow low-concentration nitrogen to enter the first air cavity 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, a connecting hole 420 is provided at one end of the inner tube 400, located at the sealed connection position and away from the nozzle 500. It will be appreciated that an annular chamber is also formed between the inner tube 400, located on the side of the connecting hole 420 away from the nozzle 500, and the inner wall of the gun body 100. The low-concentration nitrogen gas first enters this annular chamber and then enters the first air cavity 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 air cavity 102 is formed between the inner tube 400, located on the side of the connecting hole 420 closer to the nozzle 500, and the inner wall of the gun body 100.

[0051] Specifically, to isolate the first air cavity 101 and the second air cavity 102 from each other, the handheld laser welding gun further includes a sealing ring 410, which is used to seal the outer wall of the inner tube 400 and the inner wall of the gun body 100 at the sealed connection position. It will be appreciated that the ring-shaped sealing ring 410 provides a better sealing effect. A low-concentration nitrogen gas supply pipe 210 is also provided within 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 outlet of the nitrogen generation unit, allowing the low-concentration nitrogen to enter the first air cavity 101.

[0052] Preferably, the handheld laser welding gun further includes a connector 600 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 air cavity 101 and can be used for the flow of low-concentration nitrogen; the second outlet 620 is connected to the second air cavity 102 and can be used for the flow of high-concentration nitrogen.

[0053] Furthermore, the end of the connecting member 600 away from the gun body 100 is connected to the nozzle 500, the end of the first outlet 610 away from the first air cavity 101 is connected to the first nozzle 510, and the end of the second outlet 620 away from the second air cavity 102 is connected to the second nozzle 520. That is, the first nozzle 510 is connected to the first air cavity 101 through the first outlet 610, and the low concentration nitrogen can be Figure 3 The solid line and arrow indicate the direction of flow along the first air cavity 101, the first outlet 610 and the first nozzle 510; the second nozzle 520 is connected to the second air cavity 102 through the second outlet 620, and the high concentration nitrogen can be as Figure 3 The air flows in the direction indicated by the dotted line and the arrow along the second air cavity 102 , the second outlet 620 and the second nozzle 520 .

[0054] Specifically, the connector 600 is adjustable relative to the gun body 100 along the axial direction of the light output channel 310. That is, the connection point between 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 focal point. By adjusting the distance between the nozzle 500 and the gun body 100 through the connector 600, and thus the distance between the focal point and the nozzle 500, the distance 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 further 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 air cavity 101 and the first outlet 610 are connected via the connecting tube 430. The connecting tube 430 can be used to isolate the first air cavity 101 and the second air cavity 102, thereby preventing cross-mixing of the first shielding gas and the second shielding gas, which could affect the concentration of the second shielding gas.

[0056] Furthermore, to achieve focusing, connecting tube 430 and connector 600 are sleeved together, and the connection position of connecting tube 430 and connector 600 can be translated along the axial direction of light output channel 310 to change the distance between nozzle 500 and the laser beam focal point. The sleeved connector 600 and connecting tube 430 form a sealed sliding connection, which allows adjustment while preventing the flow of nitrogen gas of different concentrations.

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

[0058] In this embodiment, the handheld laser welding gun is further provided with a wire feeder 700, and the nozzle 500 is correspondingly provided with a third nozzle 530. One end of the wire feeder 700 is disposed within the gun body 100, and the other end extends through the gun base 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 in the same straight line, and the third nozzle 530 is disposed at the end of the first nozzle 510 away from the second nozzle 520.

[0059] When the handheld laser welding gun is in use, the laser beam passes through the inner tube 400, the first outlet 610, and the first nozzle 510 in the light outlet channel 310 and is output to the exterior of the handheld laser welding gun. The low-concentration nitrogen gas from the nitrogen generator unit passes through the low-concentration nitrogen gas transmission pipe 210 and then passes 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 to be output to the exterior of the handheld laser welding gun. The high-concentration nitrogen gas from the nitrogen generator unit enters the nitrogen outlet and the air pipe port, passes through the connector 121, the second air cavity 102, and then passes through the second outlet 620 and the second nozzle 520 to be output to the exterior of the handheld laser welding gun. The welding wire is output to the exterior 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, comprising a handheld laser welding gun according to any of the above solutions. The above laser processing device has better welding effect and higher resource utilization rate.

[0061] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. Handheld laser welding gun, characterized by, include: A gun body (100), wherein a first air cavity (101) and a second air cavity (102) are provided in the gun body (100); a nozzle (500), the nozzle (500) being connected to the gun body (100), the nozzle (500) being provided with a first nozzle opening (510) and a second nozzle opening (520) spaced apart from each other, the first nozzle opening (510) being communicated with the first air cavity (101), and the second nozzle opening (520) being communicated with the second air cavity (102); The first air cavity (101) is used to provide a storage space for low-concentration nitrogen and can guide the low-concentration nitrogen to be output from the first nozzle (510) to the outside of the gun body (100); the second air cavity (102) is used to provide a storage space for high-concentration nitrogen and can guide the high-concentration nitrogen to be output from the second nozzle (520) to the outside of the gun body (100); a light output channel (310) is also provided in the gun body (100), and the light output 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 further comprises an inner tube (400), wherein the inner tube (400) is arranged in the gun body (100), the first air cavity (101) is formed in the inner tube (400), and the outer wall of the inner tube (400) and a portion of the inner wall of the gun body (100) form the second air cavity (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 and connected to isolate the first air cavity (101) and the second air cavity (102).

4. The handheld laser welding gun according to claim 2, characterized in that: The inner tube (400) is provided with a communicating hole (420), the communicating hole (420) being in communication with the first air cavity (101), and the communicating hole (420) can be used to allow low-concentration nitrogen to enter the first air cavity (102).

5. The handheld laser welding gun according to claim 1, characterized in that: The handheld laser welding gun further comprises a joint (121), wherein the joint (121) is in communication with the second air cavity (102), and the joint (121) can be used to supply high-concentration nitrogen gas into the second air cavity (102).

6. The handheld laser welding gun according to claim 2, characterized in that: The handheld laser welding gun further comprises a connecting piece (600), one end of the connecting piece (600) being connected to the nozzle (500) and the other end being connected to the gun body (100), the connecting piece (600) being provided with a first outlet (610) and a second outlet (620), the first nozzle (510) being communicated with the first air cavity (101) via the first outlet (610), and the second nozzle (520) being communicated with the second air cavity (102) via the second outlet (620).

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

8. The handheld laser welding gun according to claim 7, characterized in that: The handheld laser welding gun further comprises a connecting tube (430), one end of the connecting tube (430) is connected to the inner tube (400), the other end of the connecting tube (430) is connected to the connecting piece (600), and the first outlet (610) and the first air cavity (101) are in communication via the connecting tube (430); The connecting tube (430) is sleeve-fitted 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 outlet channel (310) to change the distance between the nozzle (500) and the focus of the laser beam.

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

10. Laser processing equipment, characterized in that The invention comprises a handheld laser welding gun as described in any one of claims 1 to 9.

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