Gauzing device and gauzing method

Abstract

Provided are a guttering device having a TIG welding function, a cutting function, and a fusing function, and a method for guttering a metal member. 【Solution means】 A welding power source 24 that supplies current to a tungsten electrode 11 that performs arc discharge between a torch nozzle 1 that discharges a specific gas that serves to move the shielding gas and the molten base material 32, and the base material 26 housed in the torch nozzle 1, a gas cylinder 21 that supplies the shielding gas to the torch nozzle 1, a gas cylinder 28 that supplies the specific gas to the torch nozzle 1, a solenoid valve 29 that intermittently supplies the specific gas to the torch nozzle 1 by opening and closing, and a control unit that controls the opening and closing of the solenoid valve 29.

Description

Technical Field

[0001] The present invention relates to a torch nozzle used for TIG (Tungsten Inert Gas) welding, a torch nozzle set composed of a plurality of torch nozzles, a gouging device, and a gouging method.

Background Art

[0002] As general methods for cutting stainless steel materials, cutting with a blade (such as a grinder, saber saw, hand saw, etc.) and melting (such as a plasma cutter, etc.) can be mentioned. Among these cutting methods, considering work efficiency, plasma cutting is considered superior. However, as the thickness of the stainless steel material increases, there are also demerits such as a sharp decrease in the cutting speed, scattering of slag (dross) during cutting, and generation of a large amount of fume (dust).

[0003] In order to eliminate these demerits, a cutting method capable of suppressing the scattering of slag and the generation of dust has been disclosed (see, for example, Patent Document 1).

[0004] On the other hand, in welding, one of the methods mainly used for back gouging of the welded part (in butt welding, gouging the unfused part at the bottom of the groove or the first layer part, etc. from the back) is air arc gouging. In air arc gouging, a carbon electrode is attached to an air arc gouging torch to generate an arc between the electrode and the base material to melt the base material, and at the same time, compressed air is blown to blow away the molten base material to perform groove digging.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in Patent Document 1, for example, when cutting a stainless steel flat plate, it is difficult to move the molten base material of the molten pool generated by arc discharge. Further, even in the case of a cylindrical pipe, it is difficult to move the molten base material of the molten pool generated by arc discharge near the apex of the horizontally installed pipe, similar to the case of cutting a flat plate.

[0007] Therefore, an object of the present invention is to provide a torch nozzle that can melt and cut a base material by repeatedly chopping the base material in order to effectively utilize an existing TIG welding apparatus.

Means for Solving the Problems

[0008] The torch nozzle according to the first aspect of the present invention is a substantially cylindrical torch nozzle that houses a tungsten electrode for performing arc discharge with a base material and discharges a shielding gas. The torch nozzle is provided with a receiving port for receiving a specific gas, and is configured to discharge the specific gas received from the receiving port from the substantially cylindrical base material side end portion.

[0009] With this configuration, while melting the base material by arc discharge, when the surface diameter of the generated molten pool reaches a predetermined size, if a specific gas is discharged, the molten base material of the molten pool moves on the base material. When the molten base material moves on the base material, since the temperature difference between the molten base material of the molten pool and the base material is large, even if it solidifies on the base material, it will not weld. By repeating the operation of moving the molten base material of the molten pool by a specific gas, that is, the chopping operation on the base material, finally the base material can be melted and cut.

[0010] According to the torch nozzle according to the second aspect of the present invention, a communication pipe that communicates the specific gas from the receiving port to the discharge groove can be provided inside the substantially cylindrical wall that constitutes the substantially cylindrical shape of the torch nozzle.

[0011] According to the torch nozzle according to the third aspect of the present invention, the communication pipe can be configured to be inclined along the reduced diameter of the accommodating portion that accommodates the tungsten electrode.

[0012] According to the torch nozzle according to the fourth aspect of the present invention, there is a housing portion that houses a tungsten electrode that performs arc discharge with a base material, and it is a substantially cylindrical torch nozzle that discharges a shielding gas from a gap between the tungsten electrode and the housing portion. A receiving port for receiving a specific gas having a role different from that of the shielding gas and serving to move the molten base material is provided in the torch nozzle. The shielding gas and the specific gas are each an inert gas, and the specific gas can be configured to be discharged together with the shielding gas from the gap between the tungsten electrode and the housing portion.

[0013] According to the torch nozzle set according to the fifth aspect of the present invention, it is a torch nozzle set including at least a first torch nozzle and a second torch nozzle. Each of the plurality of torch nozzles has a housing portion that houses a tungsten electrode that performs arc discharge with a base material, and discharges a shielding gas from a gap between the tungsten electrode and the housing portion. A mounting portion that can be detachably attached to a common torch is formed at the rear end portion of the torch nozzle. The first torch nozzle is provided with a receiving port for receiving a specific gas having a role different from that of the shielding gas and serving to move the molten base material from a specific gas pipeline common to the first torch nozzle and the second torch nozzle. A discharge groove is formed at the substantially cylindrical base material side end portion, and the specific gas is discharged from the discharge groove. The second torch nozzle is provided with a receiving port for receiving a specific gas having a role different from that of the shielding gas and serving to move the molten base material from the specific gas pipeline. The shielding gas and the specific gas are each an inert gas, and the specific gas can be configured to be discharged together with the shielding gas from the gap between the tungsten electrode and the housing portion.

Effects of the Invention

[0014] According to the present invention, in order to effectively utilize an existing TIG welding apparatus, it is possible to provide a torch nozzle capable of severing a base material by repeatedly gouging the base material.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Modes for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments shown below are examples of a torch nozzle and a torch nozzle set for embodying the technical idea of the present invention, and the present invention is not limited to them. Further, this specification does not in any way identify the members shown in the claims with the members of the embodiments. In particular, dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments are not intended to limit the scope of the present invention only to them, but are merely illustrative examples. Note that the sizes and positional relationships of the members shown in each drawing may be exaggerated for clarity of explanation. Further, in the following description, the same names and reference numerals denote the same or similar members, and detailed descriptions will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are formed of the same member and a single member serves as a plurality of elements, or conversely, the functions of a single member may be realized by sharing among a plurality of members. (First Embodiment)

[0017] FIG. 1 is a perspective view showing a torch nozzle. As shown in the figure, the torch nozzle 1 is formed in a substantially cylindrical shape made of phosphor bronze. And, the torch nozzle 1 is formed with a housing portion 12 for housing the tungsten electrode 11 that performs arc discharge with the base material. The tungsten electrode 11 is housed, and shield gas is discharged from the gap between the tungsten electrode 11 and the housing portion 12. A receiving port 13 for receiving and supplying a specific gas is provided at the upper part of the torch nozzle 1.

[0018] Also, a substantially U-shaped discharge groove 14 is formed at the base material side end of the torch nozzle 1. This discharge groove 14 is formed at the rear end side in the advancing direction of the torch nozzle 1. The specific gas received from the receiving port 13 is discharged from the substantially U-shaped discharge groove 14.

[0019] Figure 2 is a side view seen from the base material side end of the torch nozzle 1. As shown in the figure, inside the discharge groove 14, three communication pipes 15 extending inward are provided. Figure 3 is a plan view of the torch nozzle 1. As shown in the figure, the three communication pipes 15 are provided inside the substantially cylindrical wall constituting the torch nozzle 1. And the three communication pipes 15 communicate between the receiving port 13 and the discharge groove 14 formed at the base material side end. For this reason, the specific gas received from the receiving port 13 is discharged from the discharge groove 14 at the base material side end through the three communication pipes 15.

[0020] Figure 4 is a right side view of the torch nozzle 1. As shown in the figure, the accommodating portion 12 for accommodating the tungsten electrode 11 (not shown) is reduced in diameter toward the discharge method of the shielding gas. For this reason, the shielding gas is rectified and the shielding effect against the arc is improved. The communication pipe 15 is inclined toward the accommodating portion 12 as it extends to the base material side end of the torch nozzle 1. That is, the communication pipe 15 is inclined with respect to the central axis (the dashed-dotted line shown in the figure) of the torch nozzle 1 along the diameter reduction of the accommodating portion 12. That is, the communication pipe 15 is inclined with respect to the longitudinal direction of the torch nozzle 1. And the specific gas received from the receiving port 13 is discharged from the discharge groove 14 through the communication pipe 15. As a result, the specific gas is discharged from an oblique direction with respect to the arc discharge.

[0021] Figure 5 is an explanatory diagram showing the configuration of TIG welding. As shown in the figure, the gas cylinder 21 is filled with argon gas as the shielding gas. The argon gas supplied from the gas cylinder 21 is connected to the welding power source 24 via the pressure regulator 22 and the flow meter 23. The pressure regulator 22 adjusts the gas pressure of the argon gas filled in the gas cylinders 21 and 28. The flow meter 23 measures the flow rate of the argon gas supplied from the gas cylinders 21 and 28. The welding power source 24 supplies the electric power necessary for TIG welding.

[0022] The welding power source 24 is connected to a remote controller 25 that controls the discharge of shielding gas, specific gas, etc. Further, the welding power source 24 is connected to a torch 27 that performs TIG welding on the base material 26. A torch nozzle 1 is detachably attached to the tip of this torch 27. Argon gas is supplied to the torch 27 as shielding gas via the welding power source 24.

[0023] The gas cylinder 28 is filled with argon gas as the specific gas. The argon gas supplied from the gas cylinder 28 is supplied to the torch nozzle 1 via the pressure regulator 22, the flow meter 23, the solenoid valve 29, and the specific gas pipeline 30. When the remote controller 25 is operated, the solenoid valve 29 is opened and closed, and the specific gas is discharged from the discharge groove 14 of the torch nozzle 1.

[0024] In the configuration of TIG welding configured as described above, the case of planing the base material will be described. Fig. 6 is a first explanatory diagram showing the state when planing the base material. As shown in Fig. 6(a), when the temperature of the base material 26 rises due to arc discharge while the torch 27 is inclined, the base material 26 melts, and eventually a molten pool 31 (double diagonal lines shown in the figure) is generated.

[0025] Then, for example, when the surface diameter of the molten pool 31 reaches a predetermined size, if the operator operates the remote controller 25, the specific gas is discharged onto the molten pool 31. That is, the specific gas is discharged from the discharge groove 14 formed at the base material side end of the torch nozzle 1. As a result, as shown in Fig. 6(b), due to the discharge of the specific gas, the molten base material 32 of the molten pool 31 moves on the base material 26. At this time, the discharge force of the specific gas and the expansion force generated by the rapid expansion due to the arc heat act together, and the molten base material 32 moves on the base material 26. When the molten base material 32 moves on the base material 26, since the temperature difference between the molten base material 32 and the base material 26 is large, it may solidify on the base material 26 but will not weld. When the molten base material 32 thus moves away from the molten pool 31, a molten groove 33 is formed thereafter.

[0026] FIG. 7 is a second explanatory view showing the state when cutting the base material. As shown in FIG. 7(a), the torch 27 is moved in the advancing direction indicated by the arrow. When the temperature of the base material 26 rises at the moving destination, the base material 26 melts, and eventually a molten pool 31 (double hatched lines shown in the figure) is generated. For example, when the surface diameter of the molten pool 31 reaches a predetermined size, if the operator operates the remote control 25, a specific gas is discharged. Then, as shown in FIG. 7(b), the molten base material 32 of the molten pool 31 moves on the base material 26. At this time, since the temperature difference between the molten base material 32 and the base material 26 is large, even if it solidifies on the base material 26, it will not weld. When the molten base material 32 thus moves from the molten pool 31, a molten groove 33 is formed thereafter.

[0027] FIG. 8(a) is an explanatory view showing the state after cutting the base material. FIG. 8(b) is a cross-sectional view of the portion indicated by the A-A line in FIG. 8(a). As shown in FIGS. 8(a) and (b), by repeating the operation of moving the molten base material 32 of the molten pool 31 while moving the torch 27 in the advancing direction indicated by the arrow, a long molten groove 33 is formed in the advancing direction.

[0028] FIG. 9 is an explanatory view showing the state when cutting a thick base material. As shown in the figure, when melting the thick base material 26, as shown in FIG. 9(a), while tilting the torch 27, if the operation of moving the molten base material 32 of the generated molten pool 31 is performed once along the advancing direction, a molten groove 33 with a predetermined depth is formed.

[0029] Thereafter, as shown in FIGS. 9(b) to (d) of the same figure, the same operation is repeated again for the molten groove 33 formed in the previous operation. That is, the base material 26 is melted again at the same position to generate a molten pool 31 again. And the generated molten base material 32 is moved. At this time, the molten groove 33 enhances the effect of the shielding gas. That is, the molten groove 33 can stably maintain the arc discharge and prevent oxidation. By repeating this operation, even for the thick base material 26, the molten groove 33 is gradually formed deeper, and finally the base material 26 can be melted through.

[0030] As described above, according to the present embodiment, the following operations and effects can be obtained.

[0031] (1) A substantially U-shaped discharge groove 14 is formed at the base material side end of the torch nozzle 1, and the specific gas received from the receiving port 13 is discharged from the substantially U-shaped discharge groove 14. Therefore, for example, when the surface diameter of the molten pool 31 reaches a predetermined size, if the operator operates the remote control 25, the specific gas is discharged into the molten pool 31. As a result, due to the discharge of the specific gas, the molten base material 32 of the molten pool 31 moves on the base material 26. At this time, the discharge force of the specific gas and the expansion force generated by the rapid expansion due to the arc heat act together, and the molten base material 32 moves on the base material 26. When the molten base material 32 moves on the base material 26, since the temperature difference between the molten base material 32 and the base material 26 is large, even if it solidifies on the base material 26, it will not weld. Therefore, if the operation of melting the base material 26 by arc discharge and moving the molten base material 32 of the generated molten pool 31 by the specific gas, that is, the chipping operation on the base material 26, is repeated, ultimately the base material 26 can be severed.

[0032] (2) The generation of the molten pool 31 by arc discharge and the movement of the molten base material 32 of the molten pool 31 by the discharge of the specific gas are repeated, and the melting groove 33 is formed. At this time, for the base material 26, heating by arc discharge and instantaneous cooling by the discharge of the specific gas are alternately repeated. For this reason, the thermal expansion of the base material 26 is suppressed, and the unevenness in the melting groove 33 is reduced. Therefore, a melting groove 33 with a smooth surface and a substantially linear tone is formed.

[0033] (3) The three communication pipes 15 communicate the receiving port 13 and the discharge groove 14 formed at the base material side end. For this reason, the specific gas received from the receiving port 13 is discharged from the discharge groove 14 at the base material side end through the three communication pipes 15. Therefore, even when the specific gas is discharged, it is possible to extremely suppress the specific gas from entraining the surrounding air, and the effect of the shielding gas is not weakened. Therefore, the effect of the shielding gas can be maintained.

[0034] (4) Moreover, the discharge groove 14 is formed in a substantially U shape at the base material side end of the torch nozzle 1. Therefore, it is possible to wrap the entire molten base material 32 of the molten pool 31, that is, to move the molten base material 32 as a single mass over the base material 26. In addition, since the discharge groove 14 is formed in a substantially U shape, the possibility of affecting the shielding gas is extremely low. Thus, while utilizing the TIG welding function, it is possible to perform chipping work on the base material 26 and cutting of the base material 26.

[0035] (5) The communication pipe 15 is inclined with respect to the central axis of the torch nozzle 1 along the diameter reduction of the housing portion 12. That is, the communication pipe 15 is inclined with respect to the longitudinal direction of the torch nozzle 1. For this reason, the specific gas received from the receiving port 13 is discharged from the discharge groove 14 via the communication pipe 15. As a result, the specific gas is discharged from an oblique direction with respect to the arc discharge. Therefore, the molten base material 32 of the molten pool 31 is moved over the base material 26.

[0036] (6) The communication pipe 15 is composed of three pipes. For this reason, the specific gas received from the receiving port 13 is discharged from the discharge groove 14 via the three communication pipes 15 without staying near the receiving port 13. Therefore, the specific gas is surely discharged from the discharge groove 14.

[0037] (7) When the torch nozzle 1 does not receive the specific gas from the receiving port 13, the torch nozzle 1 has a normal TIG welding function. On the other hand, when discharging the specific gas from the discharge groove 14, the base material 26 can be cut by repeating the chipping work on the base material 26. Therefore, the torch nozzle 1 is provided with a TIG welding function, a chipping function, and a cutting function. Thus, according to the torch nozzle 1, after TIG welding, the welded portion can be removed again, so there is no need to prepare an air arc gouging device. Also, since an inert gas is used at that time, oxidation and nitridation of the surface of the base material 26 can be prevented. As a result, there is no need to remove the oxidized portion and the nitrided portion, and re-welding can be performed immediately.

[0038] (8) For example, when repairing an iron material with a slight crack as the base material 26, usually when cutting the periphery of the crack with a grinder or the like, iron chips may enter the crack, making it difficult to grasp the depth of the crack. However, if a method is adopted in which the iron of the base material 26 is melted using the torch nozzle 1 and the melted iron is moved with a specific gas, due to the surface tension of the melted iron, the melted iron will not enter the crack, and the periphery of the crack can be surely removed. That is, the periphery of the crack can be chiseled off using the torch nozzle 1.

[0039] (9) For example, when the surface diameter of the molten pool 31 reaches a predetermined size, the operator is operating the remote control 25. This is based on the inventor's rule of thumb that when the surface diameter of the molten pool 31 becomes approximately the same as the depth of the molten pool 31. Therefore, the deeper the molten pool 31 can be formed as the surface diameter of the molten pool 31 increases. Accordingly, based on the surface diameter of the molten pool 31 during operation, the depth of the molten pool 31, and thus the depth of the molten groove 33, can be grasped in advance.

[0040] It should be noted that the above embodiment can also be modified and embodied as follows.

[0041] · The material of the torch nozzle 1 may be ceramic, brass, or alumina (aluminum oxide).

[0042] · The specific gas may be an inert gas containing a small amount of oxygen. For example, a specific gas composed of 98% argon and 2% oxygen may be used. According to such a specific gas containing a small amount of oxygen, since the base material is oxidized and the melting temperature decreases, the base material is more easily melted. Also, since the viscosity of the molten base material 32 decreases, the molten base material 32 can be made to flow more easily.

[0043] · As the shielding gas, an inert gas containing a small amount of hydrogen gas may be used. For example, a shielding gas composed of 97% argon and 3% hydrogen may be used. According to the shielding gas containing a small amount of hydrogen gas in this way, the arc heat is easily transmitted to the base material 26, and the size and depth of the molten pool 31 increase. As a result, TIG welding and melting of the base material 26 can be performed quickly.

[0044] · A configuration may be adopted in which a remote controller 25 for allowing an operator to discharge a specific gas from the discharge groove 14 is provided on the torch 27. With this configuration, the operator can easily operate the timing of discharging the specific gas while holding the torch 27.

[0045] · A configuration may be adopted in which the specific gas is discharged from the discharge groove 14 when the temperature of the molten pool 31 reaches a predetermined temperature by a temperature sensor, an infrared sensor, or the like. With this configuration, it is not necessary for the operator to operate a remote controller for discharging the specific gas from the discharge groove 14, and the remote controller for discharging the specific gas can be omitted.

[0046] · A configuration may be adopted in which the shielding gas and the specific gas are branched from one gas cylinder. That is, if an inert gas similar to the shielding gas is adopted as the specific gas, a configuration in which the shielding gas and the specific gas are branched from the gas cylinder 21 is sufficient, so it is not necessary to prepare a specific gas separately, and the configuration becomes simple.

[0047] · The discharge groove 14 may be formed in a substantially V shape.

[0048] · The discharge groove 14 may be formed in a plurality of small diameters and substantially U-shaped or substantially V-shaped as a whole. (Second Embodiment)

[0049] Figures 10 and 11 show a torch nozzle according to the second embodiment of the present invention. As shown in FIG. 10, the torch nozzle 1 according to the second embodiment is formed with a housing portion 12 for housing a tungsten electrode 11 that performs arc discharge with the base material 26, and a receiving port 13 for receiving and supplying a specific gas is provided at the upper part of the torch nozzle 1.

[0050] As shown in FIG. 11, the housing portion 12 and the receiving port 13 are connected to the hollow portion 1a of the torch nozzle 1. Further, both the shielding gas and the specific gas are argon gas. The specific gas is discharged together with the shielding gas from the gap between the tungsten electrode 11 and the housing portion 12 through the hollow portion 1a. Mainly, this point is different between this embodiment and the above-described embodiment. In this embodiment, the torch nozzle 1 has an inner cylindrical body 1b made of ceramic and formed in a substantially cylindrical shape on the inner circumference.

[0051] During arc discharge, the shielding gas is always supplied from the torch 27 to the hollow portion 1a of the torch nozzle 1, and when moving the molten base material 32 of the molten pool 31, the specific gas is supplied to the receiving port 13. The specific gas is adjusted to a required pressure so as to be able to blow off the molten base material 32. The specific gas supplied to the receiving port 13 mixes with the shielding gas in the hollow portion 1a and is discharged from the gap between the tungsten electrode 11 and the housing portion 12 through the hollow portion 1a.

[0052] The torch nozzle 1 shown in Fig. 1 is effective when the base material is a metal with a relatively small amount of spatter generation, such as stainless steel. However, when the base material is a metal with a relatively large amount of spatter generation, such as carbon steel, cast iron, or other metals containing a large amount of impurities, the spatter generated during the arc discharge welds to the opening of the U-shaped discharge groove 14, blocking the discharge groove 14, and the torch nozzle becomes unusable relatively quickly. However, according to the torch nozzle 1 shown in Fig. 10 according to this second embodiment, even when the base material generates a relatively large amount of spatter, such as carbon steel, cast iron, or other metals containing a large amount of impurities, the gap between the tungsten electrode 11 and the housing portion 12 can be made relatively large. Therefore, it is difficult for the gap to be blocked by spatter, and a torch nozzle that can be used for a long time can be obtained. (Third Embodiment)

[0053] Fig. 12 shows a torch nozzle according to the third embodiment of the present invention. As shown in Fig. 12, the receiving port 13 of the torch nozzle 1 according to the third embodiment is formed offset so as not to intersect the longitudinal central axis CL0 of the torch nozzle 1. That is, the central axis CL1 of the receiving port 13 is displaced radially by a predetermined amount e from the central axis CL2 that is parallel to the central axis CL1 and passes through the longitudinal center axis CL0 of the torch nozzle. As a result, a swirling flow is generated in which the specific gas swirls around the tungsten electrode 11 and moves toward the tip side, increasing the flow velocity of the specific gas. Therefore, the force for blowing away the molten base material 32 of the discharged specific gas increases. Therefore, the base material can be effectively cut while suppressing the consumption of the specific gas. (Torch Nozzle Set)

[0054] According to the present invention, in order to be able to perform cutting work and the like with a single torch 27 regardless of whether the base material is a metal with a relatively small amount of spatter generation or a metal with a relatively large amount of spatter generation, a torch nozzle set including a plurality of torch nozzles is prepared, including a first torch nozzle that serves as an attachment for a base material with a small amount of spatter generation and a second torch nozzle that serves as an attachment for a base material with a relatively large amount of spatter generation.

[0055] In this torch nozzle set, the torch nozzle 1 shown in FIG. 1 is used as the first torch nozzle, and the torch nozzle 1 shown in FIG. 10 or FIG. 12 is used as the second torch nozzle.

[0056] As shown in FIGS. 1, 10, and 12, a mounting portion 1c for mounting on the tip of the torch 27 is provided at the rear end of each torch nozzle 1, and male threads of the same standard are respectively formed on each mounting portion 1c. A hole with a female thread adapted to the mounting portion 1c is provided at the tip of the torch 27, and each torch nozzle 1 can be individually attached to and detached from the tip of the torch 27.

[0057] The torch nozzles 1 shown in FIGS. 10 and 12 receive the supply of a specific gas from a specific gas pipeline 30 connected to the solenoid valve 29 shown in FIG. 5 in the same manner as the torch nozzle 1 shown in FIG. 1 at their gas inlet and outlet 13. That is, the specific gas pipeline 30 is common to each torch nozzle 1 shown in FIGS. 1, 10, and 12. Pipe joints are provided at the gas inlet and outlet 13 of each torch nozzle 1 shown in FIGS. 10 and 12 as shown by the dashed-dotted line, and this pipe joint and the specific gas pipeline 30 can be joined in a separable manner as appropriate. A pipe joint of the same standard as that in FIGS. 10 and 12 is also provided at the gas inlet and outlet 13 of the torch nozzle 1 shown in FIG. 1, and this pipe joint and the specific gas pipeline 30 can be joined in a separable manner as appropriate. The portion of the specific gas pipeline 30 close to the pipe joint is preferably a flexible hose. In order to join the specific gas pipeline 30 and the gas inlet and outlet 13 in a separable manner as appropriate, a coupler joint, for example, can be provided in the middle of the specific gas pipeline 30 as necessary.

[0058] This torch nozzle set may include, for example, torch nozzles having lengths corresponding to the depth of cutting the base material. And those torch nozzles, like each torch nozzle 1 shown in FIGS. 1, 10, and 12, each have a housing portion for housing a tungsten electrode that performs arc discharge with the base material, and shield gas is discharged from the gap between the tungsten electrode and the housing portion, and a mounting portion detachable from the one torch is formed at the rear end portion of the torch nozzle.

[0059] The torch nozzles that make up the torch nozzle set are stored, for example, in a common toolbox or the like, and the torch nozzle corresponding to the purpose of use by the torch is attached to the tip of the torch 27. When a torch nozzle that does not conform to the purpose of use is attached to the torch 27, remove the torch nozzle from the torch 27 and replace it with one that conforms to the purpose of use.

[0060] The technical idea grasped from the above embodiment will be described below together with its effects.

[0061] 〔1〕In the torch nozzle according to the first to fourth aspects described in paragraphs

[0008] to

[0012] , When specific gas is not received from the receiving port, a torch nozzle that functions as a torch nozzle for normal TIG welding. With this configuration, it is possible to provide a torch nozzle having a TIG welding function, a chipping function, and a cutting function.

[0062] 〔2〕A TIG welding apparatus including the torch nozzle according to the first to fourth aspects described in paragraphs

[0008] to

[0012] or the torch nozzle described in 〔1〕 above. With such a configuration, a TIG welding apparatus having a TIG welding function, a chipping function, and a cutting function can be provided. Here, as shown in FIG. 5, this TIG welding apparatus includes a solenoid valve 29 for interrupting the supply of a specific gas to a specific gas pipeline 30 for the specific gas, and a remote controller 25 for opening and closing the solenoid valve 29. Instead of configuring the solenoid valve 29 to be openable and closable by manually operating the switch of the remote controller 25, it is provided with a control device for program - controlling the opening and closing of the solenoid valve 29, and it is preferably configured such that the solenoid valve 29 can be opened and closed by the program control of this control device. The control device, for example, may include a setting unit for respectively setting the time from when the solenoid valve 29 opens until it closes, and the time from when the solenoid valve 29 closes until it opens, and a timer circuit for periodically repeating the opening and closing of the solenoid valve according to the set values of the setting unit. Furthermore, it may be configured such that the opening and closing cycle of the solenoid valve can be automatically changed according to the moving speed of the torch nozzle. Additionally, it is further provided that each supply source of a high - pressure specific gas and a low - pressure specific gas is prepared, and the high - pressure specific gas and the low - pressure specific gas switch the solenoid valve 29 according to the respectively set opening and closing cycles, the time from when the solenoid valve 29 opens until it closes, and the length of the time from when the solenoid valve 29 closes until it opens. Thereby, in this TIG welding apparatus, the solenoid valve can be opened only for the time required to move the molten base material 32, so that the usage amount of the specific gas can be saved. Also, in this TIG welding apparatus, the opening and closing of the solenoid valve by program control enables a suitable supply of the specific gas according to the work, so that the work efficiency can be improved.

Explanation of Signs

[0063] 1…torch nozzle, 1a…hollow part, 1b…inner cylinder, 1c…mounting part, 11…tungsten electrode, 12…accommodation part, 13…receiving and supplying port, 14…discharge groove, 15…communication pipe, 21…gas cylinder, 22…pressure regulator, 23…flow meter, 24…welding power source, 25…remote controller, 26…base material, 27…torch, 28…gas cylinder, 29…solenoid valve, 30…specific gas pipeline, 31…molten pool, 32…molten base material, 33…molten groove

Claims

1. A torch nozzle that ejects a shielding gas and a specific gas that has a different role from the shielding gas and has a role of moving the molten base material; A power supply unit that supplies current to an electrode housed in the torch nozzle and that performs arc discharge between the electrode and a base material; a shielding gas supply unit for supplying the shielding gas to the torch nozzle; A specific gas supply unit that supplies the specific gas to the torch nozzle; a valve for opening and closing the supply of the specific gas to the torch nozzle; A control unit that controls opening and closing of the valve, The control unit includes a setting unit that sets the length of time from when the valve opens to when it closes, and the length of time from when the valve closes to when it opens, respectively.

2. 2. The gouging device of claim 1 further comprising: A gouging device characterized in that the control unit includes a timer circuit that periodically repeats opening and closing of the valve in accordance with a set value of the setting unit.

3. 3. The gouging device of claim 2, A gouging device characterized in that the control unit can automatically change the opening and closing cycle of the valve in accordance with the moving speed of the torch nozzle.

4. 3. The gouging device of claim 2, The specific gas supply unit is A high-pressure specific gas supply unit that supplies a high-pressure specific gas, which is a high-pressure specific gas among the specific gases, to the torch nozzle; a low-pressure specific gas supply unit that supplies a low-pressure specific gas, which is a low-pressure specific gas among the specific gases, to the torch nozzle; The valve is a high-pressure specific gas valve that opens and closes the supply of the high-pressure specific gas to the torch nozzle; a low-pressure specific gas valve that opens and closes the supply of the low-pressure specific gas to the torch nozzle; The setting unit is a high-pressure specified gas setting unit that sets the length of time from when the high-pressure specified gas valve opens to when it closes, and the length of time from when the high-pressure specified gas valve closes to when it opens; a low-pressure specified gas setting unit for setting the length of time from when the low-pressure specified gas valve opens to when it closes, and the length of time from when the low-pressure specified gas valve closes to when it opens, A gouging device characterized in that the high-pressure specified gas valve and the low-pressure specified gas valve are switched according to the opening and closing cycles respectively set in the setting unit, the time from when the high-pressure specified gas valve and the low-pressure specified gas valve open to when they close, and the time from when the high-pressure specified gas valve and the low-pressure specified gas valve close to when they open.

5. 2. The gouging device of claim 1, The shielding gas and the specific gas are composed of the same gas, A gouging device characterized in that the shielding gas supply section and the specific gas supply section are shared, and the shielding gas and the specific gas are branched off from the shared supply section.

6. A gouging method comprising carrying out a gouging operation using the gouging device according to any one of claims 1 to 5.

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