Nozzle and galvanometer laser welding gas protection device

Abstract

The present invention relates to the field of laser welding technology, and provides a nozzle and a galvanometer laser welding gas protection device, wherein the nozzle comprises an air inlet pipe and a nozzle body, wherein an air inlet is provided on the first side of the nozzle body, wherein the air inlet is connected to the air inlet pipe, and an air outlet is provided on the second side of the nozzle body; wherein the interior of the nozzle body is provided with an air flow conversion area, wherein the air flow conversion area is suitable for converting the gas entering the interior of the nozzle body from the air inlet into a laminar flow from a turbulent flow, and discharging the gas from the air outlet. The nozzle provided by the present invention can realize the stable injection of the protective gas, thereby effectively improving the welding quality. The galvanometer laser welding gas protection device provided by the present application can be controlled in coordination with the control system of the galvanometer, thereby automatically positioning the workpiece and implementing gas protection.

Description

Technical Field

[0001] The invention relates to the technical field of laser welding, and in particular to a nozzle and galvanometer laser welding gas protection device. Background Art

[0002] Laser welding has the characteristics of high energy density, low heat input, small heat-affected zone, and small welding deformation, so it is widely used in the field of high-end manufacturing. As a laser welding head, the galvanometer has the characteristics of fast scanning speed, small inertia, and high repeatability, so the application of galvanometer has become the development direction of laser welding.

[0003] The structure of the galvanometer determines that coaxial gas protection cannot be used in galvanometer welding. However, if gas protection is not applied during the galvanometer welding of active metals, the weld will oxidize and affect the welding quality. Summary of the invention

[0004] A first aspect of the present invention provides a nozzle to achieve stable spraying of shielding gas, thereby effectively improving welding quality.

[0005] The second aspect of the present invention provides a galvanometer laser welding gas protection device that can be coordinated with the galvanometer control system to automatically locate the workpiece and implement gas protection, so as to solve the problem in the prior art that galvanometer welding cannot perform coaxial gas protection, thereby affecting the welding quality.

[0006] A first aspect of the present invention provides a nozzle, comprising:

[0007] Intake pipe;

[0008] A nozzle body, wherein an air inlet is provided on a first side of the nozzle body, the air inlet is connected to the air inlet pipe, and an air outlet is provided on a second side of the nozzle body; an air flow conversion area is configured inside the nozzle body, and the air flow conversion area is suitable for converting the gas entering the nozzle body from the air inlet into a turbulent flow and discharging it from the air outlet.

[0009] The present application improves the internal structure of the nozzle body so that an airflow conversion area is formed inside the nozzle body. Through the airflow conversion area, the flow state of the gas entering the nozzle body from the air inlet is converted from turbulent flow to laminar flow, and is discharged from the air outlet, thereby achieving stable injection of the protective gas, thereby effectively improving the welding quality.

[0010] According to a nozzle provided by the present invention, the airflow conversion area includes a first chamber, a second chamber and a third chamber which are interconnected;

[0011] The first chamber is arranged close to the air inlet, the third chamber is arranged close to the air outlet, the second chamber is located between the first chamber and the third chamber, the second chamber is suitable for gas buffering, and the third chamber is suitable for converting gas from turbulent flow to laminar flow.

[0012] According to a nozzle provided by the present invention, a first air-permeable partition is provided between the first chamber and the second chamber;

[0013] A second air-permeable partition is provided between the second chamber and the third chamber;

[0014] A breathable barrier is filled in the second chamber and between the first breathable spacer and the second breathable spacer; or,

[0015] The second chamber and the first chamber are both filled with air-permeable barriers.

[0016] According to a nozzle provided by the present invention, the nozzle body comprises a shell and a cover, and the cover is detachably connected to the shell;

[0017] The shell includes a base portion and a transition portion, the air inlet is arranged on one side of the transition portion, the other side of the transition portion is connected to the base portion, and the gas flow area of ​​the transition portion gradually increases from the air inlet to the base portion.

[0018] According to a nozzle provided by the present invention, the base portion is provided with a first mounting groove and a second mounting groove, the first mounting groove is suitable for mounting a first air-permeable partition, and the second mounting groove is suitable for mounting a second air-permeable partition;

[0019] At least one gas flow channel is arranged between the second installation groove and the gas outlet along the gas flow direction, and each of the gas flow channels corresponds to the gas outlet one by one.

[0020] A second aspect of the present invention provides a galvanometer laser welding gas protection device, comprising:

[0021] A first moving mechanism moving along the X direction;

[0022] A second moving mechanism moving along the Y direction, wherein the second moving mechanism is arranged on the first moving mechanism;

[0023] And a nozzle comprising any one of the above items, wherein the nozzle is connected to at least one side of the second moving mechanism.

[0024] The galvanometer laser welding gas protection device provided in the present application can work in conjunction with the laser welding control system, automatically locate to the position where gas protection is required, and perform welding gas protection, effectively solving the problem that galvanometer welding cannot perform coaxial gas protection, resulting in defects such as weld oxidation and cracks in the welded parts.

[0025] According to a galvanometer laser welding gas protection device provided by the present invention, the angle between the nozzle and the second moving mechanism is 25° to 35°.

[0026] According to a galvanometer laser welding gas protection device provided by the present invention, the first moving mechanism and the second moving mechanism both include a guide member, a moving member and a driving member, the moving member is slidably connected to the guide member, and the driving member is suitable for driving the moving member to move along the extension direction of the guide member.

[0027] According to a galvanometer laser welding gas protection device provided by the present invention, the guide member includes any one of a guide rail and a guide rod;

[0028] The moving part includes any one of a slider and a lead screw nut pair;

[0029] The driving member includes a motor or a motor assembly.

[0030] According to a galvanometer laser welding gas protection device provided by the present invention, a first position sensor is provided on the first moving mechanism, and a second position sensor is provided on the second moving mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a structural schematic diagram of the nozzle provided by the present invention;

[0033] Figure 2 It is a structural schematic diagram of the nozzle body provided by the present invention;

[0034] Figure 3 It is a structural schematic diagram of the galvanometer laser welding gas protection device provided by the present invention;

[0035] Figure 4 This is a control system diagram of a galvanometer laser welding gas protection device provided by the present invention;

[0036] Figure 5It is an airflow distribution diagram of the nozzle jet airflow provided by the present invention under the schlieren instrument;

[0037] Figure 6 It is a comparison chart of the solder joint surface with and without gas protection.

[0038] Reference numerals:

[0039] 10. Nozzle; 11. Nozzle body; 111. First chamber; 112. Second chamber; 113. Third chamber; 114. Air inlet; 115. Air outlet; 116. First mounting groove; 117. Second mounting groove; 118. Gas flow channel; 12. Cover body; 13. Air inlet pipe;

[0040] 20. First moving mechanism; 21. First guide rail; 22. First slider; 23. First motor; 24. First position sensor;

[0041] 30. Second moving mechanism; 31. Second guide rail; 32. Second slider; 33. Second motor; 34. Second position sensor. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0044] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0046] Combine the following Figures 1 to 6 It should be understood that the following description is only an illustrative embodiment of the present invention and does not constitute any limitation to the present invention.

[0047] refer to Figure 1 and Figure 2 A first aspect of the present invention provides a nozzle 10, which includes an air inlet pipe 13 and a nozzle body 11. An air inlet port 114 is provided on a first side of the nozzle body 11. The air inlet port 114 is connected to the air inlet pipe 13, and the protective gas enters the interior of the nozzle body 11 through the air inlet pipe 13.

[0048] An outlet 115 is provided on the second side of the nozzle body 11, and the outlet 115 discharges protective gas to protect the weld molten pool and the solidification area after welding; the interior of the nozzle body 11 is provided with an airflow conversion area, which is suitable for converting the flow state of the gas entering the nozzle body 11 from the air inlet 114 from turbulent flow to laminar flow, and discharging it from the outlet 115.

[0049] It can be understood that the present application improves the internal structure of the nozzle body 11 so that an airflow conversion area is formed inside the nozzle body 11. Through the airflow conversion area, the flow state of the gas entering the nozzle body 11 from the air inlet 114 is converted from turbulent flow to laminar flow, and is discharged from the air outlet 115, thereby realizing the stable injection of the protective gas, thereby effectively improving the welding quality.

[0050] like Figure 2 As shown, it can be understood that, in some embodiments of the present application, the airflow conversion area includes a first chamber 111, a second chamber 112 and a third chamber 113 that are interconnected.

[0051] Among them, the first chamber 111 is arranged close to the air inlet 114, the third chamber 113 is arranged close to the air outlet 115, and the second chamber 112 is located between the first chamber 111 and the third chamber 113. The second chamber 112 is suitable for gas buffering to ensure uniform gas distribution, and the third chamber 113 is suitable for converting the flow state of the protective gas from turbulent flow to laminar flow.

[0052] like Figure 2 As shown, it can be understood that in some embodiments of the present application, a first air permeable partition (not shown in the figure) is arranged between the first chamber 111 and the second chamber 112. The first air permeable partition can be a gauze mesh or a wire mesh, which is used to separate the first chamber 111 and the second chamber 112, and allow the protective gas in the first chamber 111 to enter the second chamber 112.

[0053] A second breathable partition (not shown in the figure) is arranged between the second chamber 112 and the third chamber 113. Similar to the above-mentioned first breathable partition, the second breathable partition may be a gauze mesh or a wire mesh, and is used to separate the first chamber 111 and the second chamber 112, and allow the protective gas in the second chamber 112 to enter the third chamber 113.

[0054] The second chamber 112 is filled with a breathable barrier (not shown in the figure) between the first breathable partition and the second breathable partition. The breathable barrier may be a component such as a sponge, which allows the protective gas to pass through and can generate resistance to the protective gas, which is equivalent to making the protective gas fully chaotic in the second chamber 112. The chaotically distributed protective gas is more evenly distributed, so that the protective gas enters the third chamber 113 from the second chamber 112 and is discharged from the outlet 115. The gas flow state of the protective gas can be changed from turbulent flow to laminar flow.

[0055] In some embodiments of the present application, in addition to filling the second chamber 112 with a breathable barrier, the first chamber 111 and the second chamber 112 may also be filled with a breathable barrier at the same time, thereby increasing the obstruction area of ​​the protective gas and making the protective gas more evenly distributed in the nozzle body 11. After the protective gas enters the third chamber 113 from the second chamber 112 and is discharged from the gas outlet 115, the gas flow state of the protective gas is better transformed from turbulent flow to laminar flow.

[0056] When the first chamber 111 and the second chamber 112 are filled with a permeable barrier at the same time, the density of the sponge filled in the first chamber 111 can be made greater than the density of the sponge filled in the second chamber 112, so that the first chamber 111 generates greater resistance to the protective gas, and the second chamber 112 generates relatively less resistance to the protective gas, so that the protective gas is evenly distributed and the flow resistance of the protective gas entering the third chamber 113 is reduced.

[0057] like Figure 1 and Figure 2 As shown, it can be understood that in some embodiments of the present application, the nozzle body 11 may include a shell and a cover 12. The shell may be made of a lightweight 1-series aluminum alloy, and the cover 12 is made of the same material as the shell, and the cover 12 is detachably connected to the shell by 6 M1 bolts. The shell is equivalent to a box-like structure, having a containing space so that the protective gas, the air-permeable partition and the air-permeable barrier are contained in the containing space.

[0058] The shell includes a base portion and a transition portion, an air inlet 114 is arranged on one side of the transition portion, and the other side of the transition portion is connected to the base portion. The gas flow area of ​​the transition portion gradually increases from the air inlet 114 to the base portion, which is equivalent to the cross-sectional shape of the transition portion being a truncated cone structure. The cross-sectional area on the side connected to the air inlet 114 is smaller, and the cross-sectional area on the side connected to the transition portion is larger, so that the gas can be evenly dispersed.

[0059] The structural design of the transition part can be designed according to the morphology of gas dispersion, and can be not only a truncated cone structure but also a rectangular structure.

[0060] like Figure 2 As shown, it can be understood that a first mounting groove 116 and a second mounting groove 117 are provided on the base portion, the first mounting groove 116 is suitable for installing a first air-permeable partition, and the second mounting groove 117 is suitable for installing a second air-permeable partition. The internal structure of the nozzle body 11 is divided into three areas by installing the first air-permeable partition and the second air-permeable partition, namely the first chamber 111, the second chamber 112 and the third chamber 113. The first air-permeable partition is provided in the first mounting groove 116 to prevent the filler in the first chamber 111 from moving to the second chamber 112 under the action of the airflow. And the second air-permeable partition is provided in the second mounting groove 117 to prevent the filler in the first chamber 111 from moving to the second chamber 112 under the action of the airflow.

[0061] At least one gas flow channel 118 is provided between the second mounting groove 117 and the gas outlet 115 along the gas flow direction, and each gas flow channel 118 corresponds to the gas outlet 115. That is, it is equivalent to providing multiple flow channels in the third chamber 113, and the protective gas evenly enters each gas flow channel 118 after being fully agitated in the first chamber 111 and the second chamber 112, enters the gas outlet 115 from the gas flow channel 118, and then exits the nozzle 10 from the gas outlet 115, so as to provide gas protection to the welding part.

[0062] In some embodiments of the present application, Figure 2As shown, five gas flow channels 118 are provided in the third chamber 113 to change the flow state of the protective gas. When the protective gas passes through the first chamber 111 and the second chamber 112, since the second chamber 112 or the two chambers are provided with a sponge, the sponge generates resistance to the flow of the protective gas, so that the protective gas is evenly distributed under the resistance, so that the blocked protective gas is evenly distributed to each gas flow channel 118 per unit time, and moves to the gas outlet 115 along the length direction of the gas flow channel 118, so that the gas flow state of the protective gas is changed from turbulent flow to laminar flow. That is, the gas volume flowing in each gas flow channel 118 per unit time is almost the same, thereby ensuring that the length of the gas laminar flow area and the gas emission state of each gas outlet 115 are basically the same, effectively improving the gas protection effect.

[0063] It should be noted that commonly used laser welding shielding gases are mainly nitrogen, argon and helium. It should also be noted that when the flow state of the shielding gas is laminar flow, it is equivalent to the shielding gas flow having only an axial velocity component but no radial velocity component, the shielding gas can stably move in a straight line, and the shielding gas can still maintain a certain distance of straight line motion after being ejected from the nozzle 10, which can well isolate the air, thereby protecting the welding molten pool.

[0064] When the flow state of the shielding gas is turbulent, since the turbulent flow has both axial velocity components and radial velocity components, it is equivalent to an unstable rotational motion. After the shielding gas leaves the nozzle 10, the air will be drawn in, thereby failing to achieve a good shielding effect.

[0065] like Figure 5 As shown, the airflow blown out of the nozzle 10 provided in the present application can be observed by a schlieren instrument. Figure 5 (a), (b), and (c) correspond to gas flow rates of 5 L / min, 15 L / min, and 25 L / min, respectively. When the gas flow rate is 15 L / min, the protective gas can flow out of the nozzle 10 provided by the present application in a stable laminar flow, and the laminar flow distance can exceed 78.4 mm, which can achieve a good gas protection effect.

[0066] See also Figure 3 The second aspect of the present application provides a galvanometer laser welding gas protection device, which includes a first moving mechanism 20 that moves along the X direction, a second moving mechanism 30 that moves along the Y direction, the second moving mechanism 30 is arranged on the first moving mechanism 20, and includes the above-mentioned nozzle 10, and the nozzle 10 is connected to at least one side of the second moving mechanism 30.

[0067] It can be understood that the nozzle 10 can be connected to one side or both sides of the second moving mechanism 30, and the specific setting can be selected according to the actual use. Since the nozzle 10 is connected to the second moving mechanism 30, and the second moving mechanism 30 is arranged on the first moving mechanism 20, when the first moving mechanism 20 moves along the X direction, the nozzle 10 can move along the X direction, and when the second moving mechanism 30 moves along the Y direction, the nozzle 10 can move along the Y direction, so that by adjusting the position of the nozzle 10, it can adapt to the position of different welding workpieces to achieve gas protection during laser welding.

[0068] It can be understood that the angle between the nozzle 10 and the second moving mechanism 30 is 25° to 35°.

[0069] like Figure 3 As shown, it can be understood that the first moving mechanism 20 and the second moving mechanism 30 both include a guide member, a moving member and a driving member, the moving member is slidably connected to the guide member, and the driving member is suitable for driving the moving member to move along the extension direction of the guide member.

[0070] Among them, the guide member can be any one of a guide rail and a guide rod; when the guide member is a guide rail, the movable member corresponds to a slider that is slidably connected to the guide rail, and the driving member is a motor assembly. The motor assembly may include a motor and a synchronous belt. The slider is connected to the synchronous belt, and the motor drives the synchronous belt to move, thereby moving the slider along the guide rail to achieve linear reciprocating motion.

[0071] When the guide member is a guide rod, the moving member may be a screw nut pair, the guide rod and the screw are arranged in parallel, the screw nut is slidably sleeved on the guide rod, the driving member may be a motor, the output end of the motor may be connected to one end of the screw through a coupling and other components, the motor directly drives the screw to rotate, and the screw nut may move along the extension direction of the guide rod, thereby realizing linear reciprocating motion. Among them, the motor may be a linear motor with a large acceleration.

[0072] like Figure 3 As shown, it can be understood that the first moving mechanism 20 is provided with a first position sensor 24, and the second moving mechanism 30 is provided with a second position sensor 34. The position of the welding workpiece is located by the first position sensor 24 and the second position sensor 34, so that the positioning information is fed back to the corresponding motor, and the motor drives the moving part to move along the X direction or the Y direction, and the nozzle 10 is quickly moved to the required welding position, and the nozzle 10 sprays the protective gas to perform gas protection on the welding workpiece.

[0073] The first position sensor 24 and the second position sensor 34 may both be non-contact one-dimensional laser position sensors.

[0074] like Figure 3As shown, specifically, the first moving mechanism 20 may include a first guide rail 21 , a first slider 22 , and a first motor 23 , and the first position sensor 24 is disposed on the first slider 22 .

[0075] The second moving mechanism 30 includes a second guide rail 31 , a second slider 32 , and a second motor 33 . The second position sensor 34 is disposed on the second slider 32 , and the second guide rail 31 is disposed on the first slider 22 , so as to realize the connection between the second moving mechanism 30 and the first moving mechanism 20 .

[0076] like Figure 5 As shown, the galvanometer laser welding gas protection device provided by the present application works in coordination with the control system of laser processing. Since the spatial position of the control system is fixed, it has a certain processing range. The position of the workpiece is not fixed, and the processing area is not fixed. At this time, the workpiece and the area to be processed can be identified by a CCD camera, and the corresponding coordinate values ​​are obtained. Then, the coordinate values ​​are sent to the control system MCU (which can be an FPGA or a single-chip microcomputer). The control system MCU gives a signal to control the first motor and the second motor to rotate so that the nozzle 10 moves to a specific position (the specific position is not the workpiece processing position, but a position to ensure that the workpiece processing position is within the laminar flow area of ​​the nozzle 10).

[0077] Specifically, the position information of the nozzle 10 is obtained by the first position sensor and the second position sensor. The first position sensor measures the distance between the first slider and the leftmost end of the first guide rail, and the second position sensor measures the distance between the second slider and the working plane. Each displacement sensor feeds back the acquired position information to the control MCU.

[0078] like Figure 6 As shown, when welding is performed using the galvanometer laser welding gas protection device provided by the present application, compared with the surface morphology of the weld without gas protection, the weld surface produced by welding using the galvanometer laser welding gas protection device provided by the present application does not undergo oxidation, the surface is well formed, and the appearance is beautiful.

[0079] It can be understood that the galvanometer laser welding gas protection device provided in the present application can work in conjunction with the laser welding control system, automatically locate to the position where gas protection is required, and perform welding gas protection, which effectively solves the problem that galvanometer welding cannot perform coaxial gas protection, resulting in defects such as weld oxidation and cracks in the welded parts.

[0080] It should be noted that the technical solutions in various embodiments of the present invention can be combined with each other, but the basis for the mutual combination is that it can be implemented by ordinary technicians in the field; when the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist, that is, it does not belong to the protection scope of the present invention.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A nozzle, characterized in that: include: Intake pipe; A nozzle body, wherein an air inlet is provided on a first side of the nozzle body, the air inlet is connected to the air inlet pipe, and an air outlet is provided on a second side of the nozzle body; an air flow conversion area is constructed inside the nozzle body, the air flow conversion area includes a first chamber, a second chamber and a third chamber which are interconnected, the first chamber is arranged close to the air inlet, the third chamber is arranged close to the air outlet, and the second chamber is located between the first chamber and the third chamber; a flow cross-section of the first chamber gradually increases from the air inlet to the second chamber, the second chamber is suitable for gas buffering, and a plurality of partitions are arranged on the third chamber perpendicular to the air flow direction at equal intervals, and a flow channel is formed between two adjacent partitions to convert the gas from turbulent flow to laminar flow and discharge it from the air outlet; The nozzle body comprises a shell and a cover, wherein the cover is detachably connected to the shell; the shell comprises a base portion and a transition portion, wherein the air inlet is arranged on one side of the transition portion, and the other side of the transition portion is connected to the base portion, and the gas flow area of ​​the transition portion gradually increases from the air inlet to the base portion; A first air permeable partition is arranged between the first chamber and the second chamber, and a second air permeable partition is arranged between the second chamber and the third chamber; a first mounting groove and a second mounting groove are arranged on the base portion, the first mounting groove is suitable for installing the first air permeable partition, and the second mounting groove is suitable for installing the second air permeable partition; at least one gas flow channel is arranged between the second mounting groove and the air outlet along the gas flow direction, and each of the gas flow channels corresponds to the air outlet one by one.

2. The nozzle according to claim 1, characterized in that A breathable barrier is filled in the second chamber and between the first breathable spacer and the second breathable spacer; Alternatively, both the second chamber and the first chamber are filled with air-permeable barriers.

3. A galvanometer laser welding gas protection device, characterized in that: include: A first moving mechanism moving along the X direction; A second moving mechanism moving along the Y direction, wherein the second moving mechanism is arranged on the first moving mechanism; And the nozzle according to any one of claims 1 to 2 is connected to at least one side of the second moving mechanism.

4. The galvanometer laser welding gas protection device according to claim 3 is characterized in that: The included angle between the nozzle and the second moving mechanism is 25° to 35°.

5. The galvanometer laser welding gas protection device according to claim 3, characterized in that: The first moving mechanism and the second moving mechanism both include a guide member, a moving member and a driving member. The moving member is slidably connected to the guide member, and the driving member is suitable for driving the moving member to move along the extension direction of the guide member.

6. The galvanometer laser welding gas protection device according to claim 5, characterized in that: The guide member includes any one of a guide rail and a guide rod; The moving part includes any one of a slider and a lead screw nut pair; The driving member includes a motor.

7. The galvanometer laser welding gas protection device according to claim 3, characterized in that: The first moving mechanism is provided with a first position sensor, and the second moving mechanism is provided with a second position sensor.

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