Gun-type manual laser welding gun meeting light weight requirement

Abstract

The present invention discloses a welding gun which is capable of preventing safety accidents of a worker by changing the material and reducing the weight while omitting unnecessary parts for a component constituting a manual laser welding gun for welding a base material by laser after being held by the worker, and more specifically, the welding gun can be used for welding the base material by using the laser after being held by the worker. A holding unit and a laser irradiation unit of the laser welding gun are assembled into a gun type (GUN Type), a plurality of lenses are arranged on the inner side to irradiate laser towards a base material for welding, and a laser moving path is formed on the inner side of the holding unit. Comprising a gripping body in which a plurality of blank spaces are formed so that water for cooling the lens can be circulated and gas is discharged through the laser irradiation unit.

Description

Technical Field

[0001] The present technology discloses a welding gun, which can prevent safety accidents of workers by omitting unnecessary parts and changing the material of the components constituting a manual laser welding gun that allows workers to hold and weld a base material using laser. Background Art

[0002] Various machine tools are used to process the base material. The base material can be processed by various machine tools such as lathes, milling machines or drilling machines. One or more machine tools can be used to produce more diverse products that better suit the needs.

[0003] Machine tools include not only contact-type processing devices that process by bringing the cutting edge into contact with the base material, but also widely used non-contact processing devices that process by irradiating a high-temperature laser beam onto the base material.

[0004] Laser processing equipment is configured to generate and focus laser beams and then irradiate the processing surface of the base material. Laser processing equipment is very useful in industrial sites because the processing surface is smooth, there is no noise during operation, and fine and precise processing can be performed.

[0005] The laser processing device has a head with a light nozzle formed on the part facing the base material, and an optical system composed of a plurality of lenses is provided inside the head, so that the focused laser light can be irradiated from the optical system through the nozzle to the base material.

[0006] On the other hand, the aforementioned conventional laser processing device for welding is also mounted on a robot arm for use, but it is mainly a gun-type laser processing device that is held by an operator and directly welds the base material.

[0007] In particular, since installing a robot arm is an expensive device and the economic burden of maintenance is quite large, manual work is more common in practice. The weight of a laser processing device is usually more than 2kg, so if the device is held for a long time to work, the burden imposed on the operator's wrists and other joints may cause safety accidents. Summary of the invention

[0008] Technical issues

[0009] The present invention aims to solve the problems of the aforementioned prior art. The purpose of the present invention is to provide a laser processing device, which can achieve lightweighting by decisively omitting unnecessary parts that constitute the weight of the laser processing device when the operator directly holds it and uses it, thereby preventing safety accidents from happening to the operator.

[0010] Technical Solution

[0011] In order to solve the foregoing technical problems, a gun-type manual laser welding torch that meets the requirements of light weight according to the present invention is a laser welding torch in which a grip unit 100 and a laser irradiation unit 200 are assembled into a gun type, and laser is irradiated toward the base material through a plurality of lenses provided inside for welding. The grip unit 100 forms a laser movement path L / L inside, and includes a grip body 110 having a plurality of blank space portions S formed therein, so that water for cooling the lens can circulate and discharge gas through the laser irradiation unit 200.

[0012] Moreover, the grip body 110 includes: a first grip body 111, which is installed inside the grip unit 100; and a second grip body 112, whose outer surface is connected to the first grip body 111 in a mutually communicating manner and is installed in such a way that one side can be connected to the laser irradiation unit 200 in a communicating manner. Preferably, the first grip body 111 and the second grip body 112 are formed of aluminum material for the light weight of the laser welding torch.

[0013] Moreover, preferably, the first grip body 111 and the second grip body 112 are formed inside with: a plurality of circulation paths W / L, which allow water to be input from the outside of the first grip body 111 for cooling the lens and circulate outside the first grip body 111 after moving in the second grip body 112; and a gas movement path G / L, which is independent of the circulation path W / L, is supplied from the outside of the first grip body 111, passes through the second grip body 112, and is discharged together with the laser toward the laser irradiation unit 200.

[0014] Moreover, preferably, the outer surface of the second grip body 112 is formed with a socket 114 and a blank space portion S. The socket 114 allows a lens insertion body 120 equipped with a lens to be detachably inserted, and the blank space portion S achieves the light weight of the second grip body 112 without interfering with the socket 114, the circulation path W / L, and the gas movement path G / L.

[0015] Moreover, the second grip body 112 is provided with a cylindrical fixing tube 116. A servo motor 130 including a bending lens 131 is installed in the fixing tube 116. A fixing member 118 for fixing the servo motor 130 is further provided inside the fixing tube 116. Preferably, a blank space portion S for reducing the weight of the fixing member 118 is formed on the outer peripheral surface of the fixing member 118.

[0016] Moreover, preferably, the first grip body 111 is further formed with a blank space portion S for achieving the light weight of the first grip body 111 without interfering with the circulation path W / L and the gas movement path G / L.

[0017] Moreover, preferably, the first grip body 111 further includes a socket 113, and the socket 113 is threadedly engaged with a threaded portion 115 formed on the outer surface of the first grip body 111 in a detachable manner and made of steel.

[0018] Moreover, the laser irradiation unit 200 includes: a connection body 210, which is coupled to one side of the second grip body 112, has a hollow portion formed on its outer surface that communicates with the laser movement path L / L of the second grip body 112, and has a gas discharge hole 211 formed that communicates with the gas movement path G / L formed in the second grip body 112; an extension rod 220, which is cylindrical and communicates with the laser movement path L / L, and has a hollow portion formed in its longitudinal direction for allowing the gas discharged through the gas discharge hole 211 to move together with the laser; and a cover 230, which is detachably coupled to the extension rod 220 in such a manner that the gas discharged through the extension rod 220 is concentrated and discharged onto the processing surface of the base material. Preferably, the extension rods 220 are fixedly connected to each other by means of bushings 221, and a blank space portion S is formed on the outer peripheral surface of the bushings 221.

[0019] Moreover, preferably, at least one or more blank space portions S are formed on the outer surface of the connection body 210 so as not to interfere with the gas discharge hole 211 for the purpose of lightening the weight of the connection body 210.

[0020] Moreover, in the second grip body 112, flow paths 112a and 112b are further formed in such a manner as to be continuous with the circulation path W / L or the gas movement path G / L formed in the first grip body 111. Preferably, the circulation path W / L, the gas movement path G / L, and the flow paths 112a and 112b are formed by means of sealed welding with valleys formed at the welding portions so as to form a space in which water and gas can move without leakage by means of a plurality of partition walls.

[0021] Advantages of the Invention

[0022] According to the present invention, different from the prior art, the first grip body and the second grip body other than the threaded portion are formed of aluminum material. In particular, not only on the outer surfaces of the first grip body and the second grip body, but also on the outer peripheral surfaces of the fixing member and the bushing and the connection body, blank space portions are formed in which unnecessary spaces are omitted, thereby achieving the light weight of the welding torch and preventing safety accidents of operators. Brief Description of the Drawings

[0023] Figure 1 Shows a gun-type manual laser welding torch that meets the light weight according to the present invention.

[0024] Figure 2 is Figure 1 a cross-sectional view of.

[0025] Figure 3 It is a cross-sectional view showing a socket that is threadedly coupled to a first grip body of a gun-shaped manual laser welding torch that satisfies weight reduction according to the present invention.

[0026] Figure 4 It shows a grip body for a gun-shaped manual laser welding torch that satisfies weight reduction according to the present invention.

[0027] Figure 5 They respectively show Figure 4 the A-A, C-C, and H-H cross-sections shown.

[0028] Figure 6 It shows Figure 4 the J-J cross-section shown.

[0029] Figure 7 It shows a second grip body of a gun-shaped manual laser welding torch that satisfies weight reduction according to the present invention.

[0030] Figure 8 The housing shown is omitted. Figure 1 the housing shown.

[0031] Figure 9 It is Figure 8 an enlarged view of the servo motor part.

[0032] Figure 10 It shows a connecting body of a gun-shaped manual laser welding torch that satisfies weight reduction according to the present invention.

[0033] Figure 11 It shows a bushing of a gun-shaped manual laser welding torch that satisfies weight reduction according to the present invention.

[0034] Figures 12 to 17 It is a diagram showing the functional relationship for cooling a lens in each embodiment of a gun-shaped manual laser welding torch that satisfies weight reduction according to the present invention.

[0035] Figure 18 It is another embodiment of the second grip body of a gun-shaped manual laser welding torch that satisfies weight reduction according to the present invention. Detailed Description of the Invention

[0036] Hereinafter, a gun-shaped manual laser welding torch (hereinafter referred to as "welding torch") that satisfies weight reduction according to the present invention will be described in detail with reference to the accompanying drawings.

[0037] First, as Figure 1 shown in Figure 2 the welding torch 1 according to the present invention includes a grip unit 100 and a laser irradiation unit 200 that are integrally in the shape of a gun (GUN).

[0038] More specifically, as Figure 2As shown, the holding unit 100 is formed in a gun shape so that an operator can hold it. Inside the holding case provided on the outside, there is a holding body 110 which communicates with the laser irradiation unit 200 described later to supply laser, and also supplies recyclable water required for cooling the lens, and also supplies a gas (for example, purified gas) for preventing foreign substances such as dust that may be generated during welding from flowing into the processing surface of the base material to be welded.

[0039] For example, for the light weight of the welding torch 1 of the present invention, as shown in the figure, the holding body 110 can be formed of aluminum material into a multi-tube form in which a plurality of individuals having a pipe shape form concentric circles. Inside, hollow parts for forming the laser movement paths L / L for the laser to move in the longitudinal direction are installed in communication with each other corresponding to the gun shape.

[0040] Here, a plurality of lenses are installed in the laser movement paths L / L so that the laser can be irradiated toward the base material through the laser movement paths L / L formed in the overall holding body 110 and the laser irradiation unit 200.

[0041] For this purpose, the first holding body 111 satisfies the following structure, that is, a first-stage focusing lens is provided inside to allow the laser to pass through, and the laser that has passed through the focused laser is adjusted in angle by a bending lens 131 rotatably connected to a servo motor 130 and then passes through another focusing lens and a protective lens provided in the second holding body 112 as the second-stage lens and is irradiated through the laser irradiation unit 200.

[0042] As Figures 3 to 6 shown, a socket 113 is provided at the lower part of the first holding body 111 so that peripheral devices such as a laser transmitter or a power cord can be connected to the welding torch 1 according to the present invention. The socket 113 has a structure that is threadedly engaged with a threaded portion 115 formed on the outer surface of the lower part of the first holding body 111 in a separable manner.

[0043] At this time, preferably, the threaded portion 115 is formed of steel material instead of aluminum material and the width of the thread is formed smaller to improve the bonding property with the socket 113.

[0044] In the first holding body 111, in addition to the aforementioned laser movement paths L / L, a circulation path W / L for allowing the water for cooling a plurality of focusing lenses and protective lenses to move in a recyclable manner and a gas movement path G / L for supplying the gas for welding are formed independently of each other.

[0045] For this purpose, as shown in the figure, the circulation path W / L and the gas movement path G / L are formed in the following structure so that they can be sealed by the holding case, that is, this structure can be connected continuously with the first holding body 111 and the second holding body 112 described later.

[0046] At this time, it is preferable that each circulation path W / L formed in the first grip body 111 and the second grip body 112 has a structure that can circulate along the outer peripheral surface of the lens, especially in the part equipped with the lens. The explanation regarding this point will be described in detail in the following embodiments.

[0047] Meanwhile, the first grip body 111 allows the externally supplied gas to pass through the gas movement path G / L and then discharges it to the outside through the laser irradiation unit 200. At the same time, a plurality of inlets 111a having mutually independent inflow holes can be formed so that the water supplied from the outside for cooling can be individually supplied to the circulation path W / L. The gas and water supplied through this inlet are also supplied at different positions as needed.

[0048] Moreover, as Figures 7 to 9 shown, the second grip body 112 has a structure that is fastened to the upper part of the first grip body 111 and enables the laser movement path L / L, the circulation path W / L, and the gas movement path G / L formed in the first grip body 111 and the second grip body 112 to communicate with each other. The laser irradiation unit 200 described later is installed on one side of the second grip body 112 that irradiates the laser toward the base material.

[0049] A tubular fixing pipe 116 is installed on the other side of the second grip body 112. The servo motor 130 can be installed on the fixing pipe 116. The bending lens 131 is rotatably inserted into the servo motor 130. The servo motor 130 can provide rotational power for the bending lens 131. A fixing member 118 is inserted into the outer surface of the servo motor 130 and fixedly installed on the inner surface of the fixing pipe 116.

[0050] At this time, preferably, a blank space portion S in which unnecessary parts are omitted is formed on the outer peripheral surface of the fixing member 118 in order to meet the weight reduction of the welding torch 1 of the present invention.

[0051] Meanwhile, at least one or more jacks 114 for detachably coupling the lens are formed on the outer surface of the second grip body 112 for the purpose of maintenance and the like. That is, the jacks 114 are formed in a manner corresponding to the number of lenses provided in the second grip body 112. The jacks 114 have a structure that allows the lens provided in the lens insertion body 120 to be detachably coupled.

[0052] At this time, preferably, in order to prevent the lens insertion body 120 inserted into the jack 114 from moving, rubber columnar bodies 114b for inserting into the jacks (114a) are provided at each corner of the inner peripheral surface of the jack 114 (please refer to Figure 18 ).

[0053] On the other hand, the aforementioned blank space portion S is described as being formed in the second grip body 112, but it may also be further formed in the first grip body 111 in order to improve the weight reduction effect. In this case, it can be formed within a range where it does not interfere with the aforementioned laser movement paths L / L, the circulation path W / L, and the gas movement path G / L respectively.

[0054] Then, as Figure 2 shown in Figure 8 , the laser irradiation unit 200 includes a connecting body 210, an extension rod 220, and a cover 230. These elements cause the laser reflected by the aforementioned plurality of lenses and the bending lens 131 to be irradiated toward the base material to achieve welding, and at the same time, allow the gas supplied through the gas movement path G / L to be discharged together to prevent foreign substances such as dust from flowing into the inside of the welding torch 1 of the present invention during the welding execution process.

[0055] For example, as Figure 10 shown, the connecting body 210 is formed on its outer surface with a hollow portion and a gas discharge hole 211 formed by perforation in such a way as to communicate with the laser movement path L / L and the gas movement path G / L that start from the first grip body 111 and extend to the second grip body 112 respectively.

[0056] At this time, preferably, the connecting body 210 is not only formed with a hollow portion, but also a blank space portion S is formed in the non-essential part that does not interfere with the gas discharge hole 211, which helps to reduce the weight of the welding torch 1 according to the present invention.

[0057] At the same time, a ring portion may also be formed at the lower part of the connecting body 210, which not only makes it convenient for the operator to carry, but also can be hung on other peripheral devices for use during the period when welding is not being performed.

[0058] Moreover, the extension rod 220 is formed in such a way that it has a hollow portion in the longitudinal direction and is generally in the shape of a pipe (PIPE). One side of it is fastened in a way that communicates with the laser movement path L / L, and the other side is fixedly coupled and installed to the cover 230 by means of a bushing 221.

[0059] At this time, the extension rod 220 is fixedly coupled to the connecting body 210 by means of a tubular bushing 221. Preferably, on the outer surface of the bushing 221 into which the extension rod 220 is inserted, the extension rod 220 is coupled in a tight fit through a plurality of cutting portions, and the plurality of cutting portions are formed radially so that the opening width can be variable (please refer to Figure 11 ).

[0060] At the same time, the outer peripheral surface of the bushing 221 is formed with a blank space portion S to help reduce the weight of the welding torch 1 of the present invention.

[0061] Moreover, the cover 230 is coupled to the other side of the extension rod 220 in a manner communicating with the hollow portion of the extension rod 220, and is formed in a shape such that the opening width coupled to the extension rod 220 gradually narrows in the length direction compared to the opening width of the other side, so that the laser and the gas can be irradiated and discharged in a manner that is concentrated on the processing surface of the base material through the hollow portion of the extension rod 220.

[0062] On the other hand, as Figures 12 to 15 shown, the lens cooling performed using a plurality of loop paths W / L will be described according to each embodiment.

[0063] Before the description, for convenience of description, the loop path W / L into which water flows is referred to as the first loop path W / L-1, and the loop path W / L through which the water is discharged after being used for cooling purposes through the first loop path is referred to as the second loop path W / L-2.

[0064] Furthermore, based on Figure 2 the reference, the focusing lens provided inside the first grip body 111 is referred to as the first lens L1, the lens among the plurality of lenses provided inside the second grip body 112 that is close to the bending lens 131 is referred to as the second lens L2, and the lens close to the cover 230 is referred to as the third lens L3.

[0065] First, the cooling method of the first embodiment supplies water through the first loop path W / L-1 among the plurality of loop paths W / L communicating with the plurality of inflow holes formed in the inlet 111a as Figure 12 shown.

[0066] The water supplied to the first loop path W / L-1 passes through the first grip body 111 and is then supplied to the second grip body 112. In this process, the water is first supplied to a plurality of flow paths 112a formed on the outer surface of the second grip body 112 that respectively house the second lens L2 and the third lens L3 to cool the lenses, and the water supplied to the flow paths then moves in the direction of the second loop path W / L-2 to satisfy the loop structure for cooling the plurality of lenses.

[0067] In this process, in order to cool the first lens L1 provided in the first grip body 111, the second loop path W / L-2 may have the following structure, that is, it flows in through one of the plurality of input holes H1, H2 formed in the first grip body 111, circulates in a manner that wraps the first lens L1, then passes through the other input hole H2, and is discharged through the inflow hole communicating with the second loop path W / L-2.

[0068] On the other hand, preferably, through the foregoing first embodiment, the first loop path W / L-1 and the second loop path W / L-2 are arranged on both sides of the gas movement path G / L in order to cool the lenses smoothly.

[0069] Moreover, the cooling method of the second embodiment is as follows Figure 13 As shown in Figure 14 If water is supplied to the first circulation path W / L-1 through the inflow hole, after the water circulates through the flow path 112b formed under the second holding body 112 where the second lens L2 and the third lens L3 are inserted, it is discharged through the second circulation path W / L-2 formed in the first holding body 111.

[0070] Of course, in this process, the first lens L1 can be cooled through a pair of input holes H1 and H2 as in the aforementioned first embodiment.

[0071] At this time, in at least one of the first embodiment and the second embodiment, the water entering and exiting through the input holes H1 and H2 to cool the first lens L1 is as follows Figure 15 As shown in Figure 16 It flows into the concentric shell 111b inside the first holding body 111.

[0072] Here, the water flowing into the shell 111b side through one of the input holes H2 passes through the first space portion 119a and the second space portion 119b formed by being mutually divided by the protruding portions 119 cut in a strip shape but having a pitch D, and then is cyclically supplied through the other input hole H1 in the direction of the second holding body 112 to cool the first lens L1.

[0073] Incidentally, the following structure is satisfied, that is, the water flowing into the first space portion 119a through the input hole H2 flows into the second space portion 119b through the pitch D formed by cutting on the protruding portion 119, and then moves in the direction of the second holding body 112 through the other input hole H1 communicating with the second space portion 119b to cool the second lens L2 and the third lens L3, and then is discharged through the inflow hole after passing through the second circulation path W / L-2.

[0074] On the other hand, the flow path 112b in the aforementioned second embodiment can be formed in the second holding body 112 in such a way as to cool one of the second lens L2 or the third lens L3 as needed, or water can be circulated through a plurality of input holes H3 and cooled by connecting the flow path 112b to the outer surface under the second holding body 112 as needed.

[0075] Finally, as shown in Figure 17 The cooling method of the third embodiment is as follows. If water is supplied through the first circulation path W / L-1 formed in the first holding body 111, the water is preferentially circulated in the indirect cooling space unit 119c formed in the first holding body 111 in such a way as to wrap the first lens L1 to perform indirect cooling of the first lens L1.

[0076] Thereafter, the following structure is satisfied, that is, the water circulating in the indirect cooling space unit 119c passes through a pair of input holes H3 formed in the second holding body 112, circulates around the periphery of the second lens L2 or the third lens L3, and is then discharged to the outside through the second circulation path W / L-2 formed in the first holding body 111.

[0077] That is, the cooling in the third embodiment is related to the following embodiment. The protrusion 119 in the foregoing second embodiment is formed on the outer surface of the first holding body 111 to form an indirect cooling space unit 119c similar to the foregoing first space portion 19a and the second space portion 119b, and one of the first lens L1, the second lens L2, or the third lens L3 can be cooled by an indirect cooling method, and the direct cooling method can be applied to another one.

[0078] On the other hand, a plurality of partition walls formed so that the circulation path W / L and the laser movement path L / L required for the cooling of the present invention move independently of each other can be realized by welding so as to achieve sealing with the first holding body 111, and the flow paths 112a and 112b formed in the foregoing second holding body 112 can also be formed by sealing welding (W) with the second holding body 112 for sealing.

[0079] For this purpose, the partition walls are processed as follows. Figure 18 As shown, after valleys are formed adjacent to each other on the surfaces (the first holding body and the second holding body) of the partition walls to be welded, the partition walls are brought into surface contact with each of the valley portions and welded by sealing welding (W) for maintaining airtightness. A space for allowing water, gas, etc. to move without leakage can be formed at the upper end of the partition wall by sealing welding.

[0080] As described above, different from the prior art, in the welding torch 1 according to the present invention, the first holding body 111 and the second holding body 112 other than the threaded portion 115 are formed of aluminum. In particular, not only the outer surfaces of the first holding body 111 and the second holding body 112, but also the outer peripheral surfaces of the fixing member 118 and the bushing 221 and the connecting body 210 are formed with a blank space portion S in which unnecessary portions are omitted, so as to satisfy the weight reduction of the welding torch 1, thereby preventing safety accidents of operators.

Claims

1. A gun-type manual laser welding gun that meets the requirements of light weight, wherein a holding unit (100) and a laser irradiation unit (200) of the laser welding gun are assembled into a gun-type and a plurality of lenses disposed inside are used to irradiate laser light toward a base material for welding, wherein the gun-type manual laser welding gun that meets the requirements of light weight is characterized in that: The holding unit (100) has a laser moving path (L / L) formed inside, and includes a holding body (110). In addition to a moving path for circulating water for cooling the lens and a moving path for exhausting gas through the laser irradiation unit (200), the holding body (110) also has independently formed space portions for lightweighting the welding gun.

2. The gun-type manual laser welding gun that satisfies the lightweight requirement according to claim 1, It is characterized in that The holding body (110) comprises: A first holding body (111), which is installed inside the holding unit (100); and A second holding body (112), the outer surface of which is connected to the first holding body (111) in a mutually communicative manner, and is installed in a manner such that one side thereof can be connected to the laser irradiation unit (200). The first holding body (111) and the second holding body (112) are formed of aluminum material in order to reduce the weight of the laser welding gun.

3. The gun-type manual laser welding gun that satisfies the lightweight requirement according to claim 2, It is characterized in that The first holding body (111) and the second holding body (112) are formed with: A plurality of circulation paths (W / L) for cooling the lens by injecting water from the outside of the first holding body (111) and circulating water to the outside of the first holding body (111) after the water moves to the second holding body (112); and A gas movement path (G / L) which is independent of the circulation path (W / L), is supplied from the outside of the first holding body (111) and is discharged toward the laser irradiation unit (200) together with the laser after passing through the second holding body (112), The circulation path (W / L) and the gas movement path (G / L) formed in the first holding body (111) are formed by sealing and welding the partition walls adjacent to each other independently.

4. The gun-type manual laser welding gun that satisfies the lightweight requirement according to claim 3, It is characterized in that The outer surface of the second holding body (112) is formed with: an insertion hole (114) into which a lens inserter (120) equipped with a lens can be removably inserted; and The blank space portion (S) is used to achieve lightweighting of the second holding body (112) in a manner that does not interfere with the insertion hole (114), the circulation path (W / L) and the gas movement path (G / L).

5. The gun-type manual laser welding gun that satisfies the lightweight requirement according to claim 3, It is characterized in that The second holding body (112) includes a cylindrical fixing tube (116) on which a servo motor (130) including a bending lens (131) is mounted. A fixing piece (118) for fixing the servo motor (130) is also provided inside the fixing tube (116), and a blank space portion (S) for reducing the weight of the fixing piece (118) is formed on the outer peripheral surface of the fixing piece (118).

6. The gun-type manual laser welding gun that satisfies the lightweight requirement according to claim 3, It is characterized in that The first holding body (111) is also provided with a blank space portion (S) for achieving lightweighting of the first holding body (111) in a manner that does not interfere with the circulation path (W / L) and the gas movement path (G / L).

7. The gun-type manual laser welding gun that satisfies the lightweight requirement according to claim 2, It is characterized in that The first holding body (111) further comprises a socket (113), The socket (113) is threadably coupled to a threaded portion (115) formed of steel material on the outer surface of the first holding body (111) in a detachable manner.

8. The gun-type manual laser welding gun that satisfies the lightweight requirement according to claim 3, It is characterized in that The laser irradiation unit (200) comprises: A connecting body (210) is connected to one side of the second holding body (112), and has an outer surface formed with a hollow portion connected to the laser moving path (L / L) of the second holding body (112), and a gas discharge hole (211) connected to the gas moving path (G / L) formed in the second holding body (112); an extension rod (220) which is cylindrical and connected to the laser moving path (L / L) and has a hollow portion formed in the length direction for allowing the gas discharged through the gas discharge hole (211) to move together with the laser; and a cover (230) which is detachably connected to the extension rod (220) in such a manner that the gas discharged through the extension rod (220) is concentrated and discharged onto the processing surface of the base material, The extension rods (220) are fixedly connected to each other by means of a bushing (221), and a blank space portion (S) is formed on the outer peripheral surface of the bushing (221).

9. The gun-type manual laser welding gun that satisfies the lightweight requirement according to claim 8, It is characterized in that In order to reduce the weight of the connecting body (210), at least one blank space portion (S) is formed on the outer surface of the connecting body (210) in a manner that does not interfere with the gas discharge hole (211).

10. The gun-type manual laser welding gun that satisfies the lightweight requirement according to claim 3, It is characterized in that The second holding body (112) is further provided with a flow path (112a, 112b) which is formed in a manner connected to the circulation path (W / L) or the gas movement path (G / L) formed on the first holding body (111). The circulation path (W / L), the gas movement path (G / L) and the flow path (112a, 112b) are formed by sealing welding in which a valley is formed at the welding portion so that a space is formed by a plurality of partition walls to allow water and gas to move without leakage.

Images