Gouging device and gouging method

Abstract

To provide a gouging device having a TIG welding function, a chipping function and a fusing function, and a gouging method of a metal member.SOLUTION: A gouging device includes: a torch nozzle 1 for discharging shield gas, and specific gas having a role of moving a molten base material 32; a welding power source 24 for supplying current to a tungsten electrode 11 for performing arc discharge between a base material 26 stored in the torch nozzle 1 and the electrode; a gas cylinder 21 for supplying the shield gas to the torch nozzle 1; a gas cylinder 28 for supplying the specific gas to the torch nozzle 1; an electromagnetic valve 29 for intermitting supply of the specific gas to the torch nozzle 1 by opening / closing; and a control part for controlling the opening / closing of the electromagnetic valve 29.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] Common methods for cutting stainless steel include cutting with blades (such as grinders, saber saws, and hand saws) and fusion cutting (such as plasma cutters). Of these cutting methods, plasma cutting is considered to be the most efficient, but it also has disadvantages, such as the cutting speed dropping sharply as the stainless steel becomes thicker, slag (dross) scattering during cutting, and the generation of large amounts of fumes (dust).

[0003] In order to overcome these disadvantages, 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] Meanwhile, air arc gouging is a method used in welding, primarily for back-removing welds (in butt welding, chipping off poor penetration at the bottom of the groove or the first layer from the back). In air arc gouging, a carbon electrode is attached to an air arc gouging torch, an arc is generated between the electrode and the base metal to melt the base metal, and compressed air is used to blow away the molten base metal, creating a groove. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-112333 Summary of the Invention [Problem to be solved by the invention]

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

[0007] SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a torch nozzle that can melt and cut a base material by repeatedly chipping the base material, in order to effectively utilize existing TIG welding equipment. [Means for solving the problem]

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

[0009] With this configuration, while the base material is melted by arc discharge, when the surface diameter of the resulting molten pool reaches a predetermined size, a specific gas is discharged, causing the molten base material in the molten pool to move over the base material. As the molten base material moves over the base material, the temperature difference between the molten base material in the molten pool and the base material is large, so even if the molten base material solidifies on the base material, it will not be welded. By repeating this process of moving the molten base material in the molten pool with a specific gas, i.e., chipping the base material, the base material can eventually be melted and cut.

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

[0011] In the torch nozzle according to the third aspect of the present invention, the communicating tube can be configured to be inclined so as to follow the reduced diameter of the housing portion that houses the tungsten electrode.

[0012] A fourth aspect of the present invention provides a torch nozzle having a substantially cylindrical shape and a housing that houses a tungsten electrode that generates an arc discharge between the tungsten electrode and a base material, and that ejects a shielding gas from a gap between the tungsten electrode and the housing. The torch nozzle is provided with a receiving port that receives a specific gas that has a different function from the shielding gas and that functions to move the molten base material, and the shielding gas and the specific gas are both inert gases, and the specific gas can be configured to be ejected together with the shielding gas from the gap between the tungsten electrode and the housing.

[0013] According to a fifth aspect of the present invention, there is provided a torch nozzle set comprising a plurality of torch nozzles including at least a first torch nozzle and a second torch nozzle, wherein each of the plurality of torch nozzles has a housing portion for housing a tungsten electrode that performs arc discharge between the tungsten electrode and a base metal, and discharges a shielding gas from a gap between the tungsten electrode and the housing portion, and a mounting portion that can be attached to a common torch is formed at the rear end of each of the torch nozzles, and the first torch nozzle discharges a specific gas that has a role different from that of the shielding gas and that serves to move the molten base metal, The first torch nozzle and the second torch nozzle can be configured so that a receiving port is provided for receiving gas from a specific gas pipe that is common to both the first torch nozzle and the second torch nozzle, a discharge groove is formed at the base material side end of the approximately cylindrical body, and the specific gas is discharged from the discharge groove, and the second torch nozzle has a different role from the shielding gas and is provided with a receiving port for receiving a specific gas from the specific gas pipe that has the role of moving the molten base material, the shielding gas and the specific gas are both inert gases, and the specific gas is 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, it is possible to provide a torch nozzle that can melt and cut a base material by repeatedly chipping the base material, thereby making effective use of existing TIG welding equipment. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a perspective view showing a torch nozzle according to a first embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a side view of the torch nozzle as seen from the end portion on the base material side. [Figure 3] FIG. 2 is a plan view of the torch nozzle. [Figure 4] FIG. 2 is a right side view of the torch nozzle. [Figure 5] FIG. 1 is an explanatory diagram showing a configuration for TIG welding. [Figure 6] FIG. 1 is a first explanatory diagram showing a state when chipping a base material. [Figure 7] FIG. 10 is a second explanatory diagram showing the state when chipping the base material. [Figure 8] 1A and 1B are an explanatory view and a cross-sectional view showing the state after chipping the base material. [Figure 9] FIG. 10 is an explanatory diagram showing the state when chipping a thick base material. [Figure 10] FIG. 4 is a perspective view of a torch nozzle according to a second embodiment of the present invention. [Figure 11] FIG. 11 is a cross-sectional view of the torch nozzle shown in FIG. [Figure 12] FIG. 10 is a perspective view of a torch nozzle according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below exemplify torch nozzles and torch nozzle sets for embodying the technical concepts of the present invention, and the present invention is not limited to these. Furthermore, this specification in no way specifies the components set forth in the claims as components of the embodiments. The dimensions, materials, shapes, and relative positions of components described in the embodiments, unless otherwise specified, are not intended to limit the scope of the present invention and are merely illustrative examples. The size and relative positions of components shown in the drawings may be exaggerated for clarity. Furthermore, in the following description, the same names and symbols indicate identical or similar components, and detailed descriptions will be omitted as appropriate. Furthermore, the elements constituting the present invention may be configured with the same components, with one component serving multiple functions, or the function of one component may be shared by multiple components. (First embodiment)

[0017] Fig. 1 is a perspective view of a torch nozzle. As shown in the figure, torch nozzle 1 is made of phosphor bronze and has a generally cylindrical shape. Torch nozzle 1 is formed with a housing 12 that houses tungsten electrode 11, which generates an arc discharge between the torch nozzle 1 and the base material. The housing 12 houses tungsten electrode 11 and discharges shielding gas from the gap between tungsten electrode 11 and housing 12. A supply port 13 is provided at the top of torch nozzle 1 for receiving a specific gas.

[0018] Furthermore, 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 on the rear end side in the direction of travel of the torch nozzle 1. The specific gas received through the receiving port 13 is discharged from the substantially U-shaped discharge groove 14.

[0019] Fig. 2 is a side view of torch nozzle 1 as seen from the base material side end. As shown in the figure, three communicating pipes 15 are provided inside discharge groove 14 and extend deep inside. Fig. 3 is a plan view of torch nozzle 1. As shown in the figure, the three communicating pipes 15 are provided inside the approximately cylindrical wall that constitutes torch nozzle 1. The three communicating pipes 15 communicate between supply port 13 and discharge groove 14 formed at the base material side end. Therefore, the specific gas received through supply port 13 is discharged from discharge groove 14 at the base material side end via the three communicating pipes 15.

[0020] FIG. 4 is a right side view of the torch nozzle 1. As shown in the figure, the housing 12, which houses the tungsten electrode 11 (not shown), tapers in diameter toward the shielding gas discharge direction. This rectifies the flow of the shielding gas, improving the shielding effect against the arc. The communicating tube 15 is inclined toward the housing 12 as it extends toward the base metal side end of the torch nozzle 1. That is, the communicating tube 15 is inclined with respect to the central axis of the torch nozzle 1 (indicated by the dashed-dotted line in the figure) so as to follow the tapered diameter of the housing 12. In other words, the communicating tube 15 is inclined with respect to the longitudinal direction of the torch nozzle 1. The specific gas received through the receiving port 13 is then discharged from the discharge groove 14 via the communicating tube 15. As a result, the specific gas is discharged obliquely toward the arc discharge.

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

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

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

[0024] In the TIG welding configuration configured as above, the case of chipping the base material will be described. Fig. 6 is a first explanatory diagram showing the state when chipping 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 tilted, the base material 26 melts and eventually a molten pool 31 (double diagonal lines in the figure) is formed.

[0025] Then, for example, when the surface diameter of the molten pool 31 reaches a predetermined size, the operator can operate the remote control 25 to discharge a specific gas 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), the molten base material 32 in the molten pool 31 moves over the base material 26 due to the discharge force of the specific gas combined with the expansion force generated by the rapid expansion due to the arc heat. As the molten base material 32 moves over the base material 26, the temperature difference between the molten base material 32 and the base material 26 is large, so even if the molten base material 32 solidifies on the base material 26, it will not be welded to the base material 26. As the molten base material 32 moves from the molten pool 31 in this way, a molten groove 33 is formed in its wake.

[0026] FIG. 7 is a second explanatory diagram showing the process of chipping a base material. As shown in FIG. 7(a), the torch 27 moves in the direction indicated by the arrow. As the temperature of the base material 26 rises at the destination, the base material 26 melts, eventually forming a molten pool 31 (shown by the double diagonal lines in the figure). For example, when the surface diameter of the molten pool 31 reaches a predetermined size, the operator can operate the remote control 25 to eject a specific gas. Then, as shown in FIG. 7(b), the molten base material 32 in the molten pool 31 moves over the base material 26. Because the temperature difference between the molten base material 32 and the base material 26 is large, even if the molten base material 32 solidifies on the base material 26, it will not be welded to the base material 26. As the molten base material 32 moves from the molten pool 31, a molten groove 33 is formed.

[0027] Fig. 8(a) is an explanatory diagram showing the state after chipping the base material. Fig. 8(b) is a cross-sectional view of the portion indicated by line AA in Fig. 8(a). As shown in Figs. 8(a) and 8(b), by repeatedly moving the molten base material 32 in the molten pool 31 while moving the torch 27 in the direction of travel indicated by the arrow, a long molten groove 33 is formed in the direction of travel.

[0028] 9 is an explanatory diagram showing the state when chipping a thick base material. As shown in the figure, when melting a thick base material 26, as shown in the figure (a), by moving the molten base material 32 of the generated molten pool 31 once along the direction of travel while tilting the torch 27, a molten groove 33 of a predetermined depth is formed.

[0029] Then, as shown in Figures 1(b) to 1(d), the same process is repeated on the molten groove 33 formed in the previous process. That is, the base material 26 is melted at the same position to generate a molten pool 31 again. The generated molten base material 32 is then moved. At this time, the molten groove 33 enhances the effect of the shielding gas. In other words, the molten groove 33 maintains a stable arc discharge and prevents oxidation. By repeating this process, even in a thick base material 26, the molten groove 33 is gradually formed deeper, and eventually the base material 26 can be melted and cut.

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

[0031] (1) A substantially U-shaped discharge groove 14 is formed at the end of the torch nozzle 1 on the base material side, 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, the operator can operate the remote control 25 to discharge the specific gas onto the molten pool 31. As a result, the discharge of the specific gas causes the molten base material 32 in the molten pool 31 to move over the base material 26. At this time, the discharge force of the specific gas and the expansion force caused by the rapid expansion due to the arc heat work together to move the molten base material 32 over the base material 26. As the molten base material 32 moves over the base material 26, the temperature difference between the molten base material 32 and the base material 26 is large, so even if the molten base material 32 solidifies on the base material 26, it will not be welded. Therefore, by repeating the process of melting the base material 26 by arc discharge and moving the molten base material 32 in the molten pool 31 that has been generated using a specific gas, i.e., chipping the base material 26, it is possible to eventually melt and cut the base material 26.

[0032] (2) The generation of a molten pool 31 by arc discharge and the movement of the molten base material 32 in the molten pool 31 by the ejection of a specific gas are repeated to form a molten groove 33. At this time, the base material 26 is alternately heated by the arc discharge and momentarily cooled by the ejection of a specific gas. This suppresses thermal expansion of the base material 26 and reduces unevenness within the molten groove 33. As a result, a molten groove 33 with a smooth surface and essentially straight lines is formed.

[0033] (3) The three communicating pipes 15 connect the receiving port 13 to the discharge groove 14 formed at the base metal end. Therefore, the specific gas received from the receiving port 13 is discharged from the discharge groove 14 at the base metal end via the three communicating pipes 15. Therefore, even when the specific gas is discharged, it is possible to minimize the entrainment of surrounding air by the specific gas, and the effect of the shielding gas is not weakened. Therefore, the effect of the shielding gas can be maintained.

[0034] (4) Furthermore, the discharge groove 14 is formed in a substantially U-shape at the end of the torch nozzle 1 on the base material side. This allows the discharge groove 14 to envelop the entire molten base material 32 in the molten pool 31, that is, to move the molten base material 32 as a single mass over the base material 26. In addition, because the discharge groove 14 is formed in a substantially U-shape, it is highly unlikely to affect the shielding gas. This allows chipping and melt-cutting of the base material 26 while utilizing the TIG welding function.

[0035] (5) The communicating pipe 15 is inclined with respect to the central axis of the torch nozzle 1 so as to follow the reduced diameter of the housing portion 12. In other words, the communicating pipe 15 is inclined with respect to the longitudinal direction of the torch nozzle 1. Therefore, the specific gas received from the receiving port 13 is discharged from the discharge groove 14 via the communicating pipe 15. As a result, the specific gas is discharged from a direction oblique to the arc discharge. Therefore, the molten base material 32 in the molten pool 31 is moved over the base material 26.

[0036] (6) The communication pipes 15 are made up of three pipes. Therefore, the specific gas received through the inlet 13 does not remain near the inlet 13, but is discharged from the discharge groove 14 through the three communication pipes 15. Therefore, the specific gas is reliably discharged from the discharge groove 14.

[0037] (7) When the torch nozzle 1 does not receive the specific gas from the inlet 13, the torch nozzle 1 has a normal TIG welding function. On the other hand, when the specific gas is discharged from the discharge groove 14, the base material 26 can be melted by repeatedly chipping the base material 26. Therefore, the torch nozzle 1 has a TIG welding function, a chipping function, and a melting function. Therefore, with the torch nozzle 1, the welded portion can be removed again after TIG welding, eliminating the need for an air arc gouging device. Furthermore, because an inert gas is used during this process, oxidation or nitriding of the surface of the base material 26 can be prevented. As a result, there is no need to remove the oxidized or nitrided portions, and the base material 26 can be immediately rewelded.

[0038] (8) For example, when repairing a steel material with a small crack as the base material 26, when cutting the area around the crack with a grinder or the like, iron chips can get into the crack, making it difficult to determine the depth of the crack. However, if a method is adopted in which the iron in the base material 26 is melted using a torch nozzle 1 and the molten iron is moved using a specific gas, the surface tension of the molten iron prevents the molten iron from getting into the crack, and the area around the crack can be reliably removed. In other words, the area around the crack can be chipped away using the torch nozzle 1.

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

[0040] The above embodiment can be modified 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 trace amount of oxygen. For example, the specific gas may be composed of 98% argon and 2% oxygen. The specific gas containing a trace amount of oxygen oxidizes the base material, lowering the melting temperature and making the base material more soluble. Furthermore, the viscosity of the molten base material 32 is reduced, making the molten base material 32 more easily flowable.

[0043] The shielding gas may be an inert gas containing a small amount of hydrogen gas. For example, a shielding gas composed of 97% argon and 3% hydrogen may be used. A shielding gas containing a small amount of hydrogen gas like this facilitates the transfer of arc heat to the base material 26, increasing the size and depth of the molten pool 31. As a result, TIG welding and melting of the base material 26 can be performed quickly.

[0044] The torch 27 may be provided with a remote controller 25 that allows the operator to discharge the specific gas from the discharge groove 14. With this configuration, the operator can easily control the timing of discharging the specific gas while still holding the torch 27.

[0045] The specific gas may be discharged from the discharge groove 14 when a temperature sensor or infrared sensor detects that the temperature of the molten pool 31 has reached a predetermined temperature. With this configuration, the operator does not need to operate a remote control to discharge the specific gas from the discharge groove 14, and the remote control for discharging the specific gas can be omitted.

[0046] A single gas cylinder may be branched into a shielding gas and a specific gas. In other words, if an inert gas similar to the shielding gas is used as the specific gas, gas cylinder 21 may be branched into a shielding gas and a specific gas, eliminating the need to prepare a separate specific gas, making the configuration simpler.

[0047] The ejection groove 14 may be formed in a substantially V-shape.

[0048] The ejection groove 14 may be formed with a plurality of small diameters so as to have an approximate U-shape or an approximate V-shape as a whole. Second Embodiment

[0049] 10 and 11 show a torch nozzle according to a 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 12 that houses a tungsten electrode 11 that generates an arc discharge between the torch nozzle 1 and a base metal 26, and a supply port 13 that receives a specific gas is provided at the top of the torch nozzle 1.

[0050] As shown in FIG. 11, the housing 12 and the supply port 13 are connected to the hollow portion 1a of the torch nozzle 1. The shielding gas and the specific gas are both argon gas. The specific gas is discharged together with the shielding gas through the hollow portion 1a and from the gap between the tungsten electrode 11 and the housing 12. This is the main difference between this embodiment and the previous embodiments. In this embodiment, the torch nozzle 1 has an inner cylinder 1b made of ceramic and formed in a roughly cylindrical shape on its inner periphery.

[0051] During arc discharge, shielding gas is constantly supplied from torch 27 to hollow portion 1a of torch nozzle 1, and when molten base material 32 in molten pool 31 is moved, a specific gas is supplied to receptacle 13. The specific gas is adjusted to the required pressure so that it can blow away molten base material 32. The specific gas supplied to receptacle 13 mixes with the shielding gas in hollow portion 1a and passes through hollow portion 1a before being discharged from the gap between tungsten electrode 11 and housing portion 12.

[0052] The torch nozzle 1 shown in Fig. 1 is effective when the base material is a metal that generates relatively little spatter, such as stainless steel. However, when the base material is a metal that generates a relatively large amount of spatter, such as carbon steel, cast iron, or other metals containing a large amount of impurities, the spatter generated during the arc discharge deposits on the opening of the U-shaped discharge groove 14, blocking the groove 14 and rendering the torch nozzle unusable in a relatively short time. However, with the torch nozzle 1 shown in Fig. 10 according to the second embodiment, even if the base material is a metal that 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 12 can be made relatively large, so that the gap is less likely 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 a third embodiment of the present invention. As shown in FIG. 12, the supply port 13 of the torch nozzle 1 according to the third embodiment is offset from the longitudinal center axis CL0 of the torch nozzle 1 so as not to intersect with it. That is, the center axis CL1 of the supply port 13 is offset radially by a predetermined amount e from the center axis CL2, which is parallel to the center axis CL1 and passes through the longitudinal center axis CL0 of the torch nozzle. This creates a swirling flow in which the specific gas swirls around the tungsten electrode 11 and moves toward its tip. This increases the flow rate of the specific gas, thereby increasing the force of the discharged specific gas to blow away the molten base material 32. This allows the base material to be effectively chipped while minimizing consumption of the specific gas. (torch nozzle set)

[0054] According to the present invention, in order to be able to perform chipping work etc. with a single torch 27 whether the base material is a metal that generates a relatively small amount of spatter or a relatively large amount of spatter, it is advisable to prepare a torch nozzle set consisting of multiple torch nozzles, including a first torch nozzle that is an attachment for base materials that generate a small amount of spatter and a second torch nozzle that is an attachment for base materials that generate a relatively large amount of spatter.

[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] 1, 10, and 12, the rear end of each torch nozzle 1 is provided with a mounting portion 1c for mounting to the tip of torch 27, and each mounting portion 1c has a male thread of the same standard. The tip of torch 27 also has a hole with a female thread that fits into the mounting portion 1c, so that each torch nozzle 1 can be individually attached to and detached from the tip of torch 27.

[0057] The torch nozzle 1 shown in Figures 10 and 12 receives a supply of a specified gas through its inlet 13 from a specified gas pipe 30 connected to the solenoid valve 29 shown in Figure 5, similar to the torch nozzle 1 shown in Figure 1. In other words, the specified gas pipe 30 is common to all of the torch nozzles 1 shown in Figures 1, 10, and 12. A pipe fitting, as shown by the two-dot chain line, is provided at the inlet 13 of each torch nozzle 1 shown in Figures 10 and 12, and this pipe fitting can be separably connected to the specified gas pipe 30 as needed. The inlet 13 of the torch nozzle 1 shown in Figure 1 also has a pipe fitting of the same standard as that shown in Figures 10 and 12, and this pipe fitting can be separably connected to the specified gas pipe 30 as needed. The portion of the specified gas pipe 30 near the pipe fitting is preferably a flexible hose. In order to appropriately connect the specific gas pipeline 30 and the inlet 13 in a separable manner, a coupler joint, for example, may be provided midway along the specific gas pipeline 30 as needed.

[0058] This torch nozzle set may include, for example, a torch nozzle of a length corresponding to the depth to be chipped into the base metal. Each of these torch nozzles, like the torch nozzles 1 shown in Figures 1, 10, and 12, has a housing that houses a tungsten electrode that generates an arc discharge between the base metal and the housing, and discharges shielding gas from the gap between the tungsten electrode and the housing. The torch nozzle has a mounting portion at the rear end that can be attached to one of the torches.

[0059] The torch nozzles that make up the torch nozzle set are stored, for example, in a common tool box, and a torch nozzle that matches the intended use of the torch is attached to the tip of torch 27. If a torch nozzle that does not match the intended use is attached to torch 27, that torch nozzle is removed from torch 27 and replaced with one that matches the intended use.

[0060] The technical concepts grasped from the above-described embodiments will be described below together with their effects.

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

[0008] to

[0012] , When the specified gas is not supplied from the supply port, the torch nozzle functions as a normal TIG welding torch nozzle. With this configuration, it is possible to provide a torch nozzle having TIG welding function, chipping function and melt-cutting function.

[0062] [2] A TIG welding device equipped with the torch nozzle according to the first to fourth aspects described in paragraphs

[0008] to

[0012] or the torch nozzle described in [1]. With this configuration, it is possible to provide a TIG welding device having TIG welding, chipping, and cutting functions. Here, as shown in Fig. 5, this TIG welding device is provided with a solenoid valve 29 for interrupting the supply of the specific gas to the specific gas pipeline 30 and a remote control 25 for opening and closing the solenoid valve 29, and instead of being configured so that the solenoid valve 29 can be opened and closed by manually operating a switch on the remote control 25, it is preferable to provide a control device for programmatically controlling the opening and closing of the solenoid valve 29, and solenoid valve 29 can be opened and closed by program control of the control device. The control device may include, for example, a setting unit that sets the time between when the solenoid valve 29 opens and closes, and a timer circuit that periodically opens and closes the solenoid valve according to the settings of the setting unit. The control device may also be configured to automatically change the solenoid valve opening and closing period according to the torch nozzle movement speed. Furthermore, the control device may be configured to provide separate supply sources for high-pressure and low-pressure specific gases, and switch the solenoid valve 29 according to the respective set opening and closing periods, the time between when the solenoid valve 29 opens and closes, and the time between when the solenoid valve 29 closes and opens. This allows the TIG welding device to open the solenoid valve only for the time required to move the molten base material 32, thereby reducing the amount of specific gas used. Furthermore, the TIG welding device allows the solenoid valve to be opened and closed under program control, thereby enabling the appropriate supply of specific gas according to the task, thereby improving work efficiency. [Explanation of symbols]

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

Claims

1. a torch nozzle that discharges 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 that supplies the shielding gas to the torch nozzle; a specific gas supply unit that supplies the specific gas to the torch nozzle; a valve that opens and closes the supply of the specific gas to the torch nozzle; a control unit that controls opening and closing of the valve; A gouging device comprising:

2. 10. The gouging device of claim 1 further comprising: 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.

3. 3. The gouging device of claim 2, further comprising: The control unit is provided with a timer circuit that periodically opens and closes the valve in accordance with a set value of the setting unit.

4. The TIG welding device according to claim 3, The control unit is capable of automatically changing the opening and closing cycle of the valve in accordance with the moving speed of the torch nozzle.

5. 4. The gouging device of claim 3, The specific gas supply unit is a high-pressure specified gas supply unit that supplies a high-pressure specified gas, which is one of the specified gases and has a high pressure, to the torch nozzle; a low-pressure specified gas supply unit that supplies a low-pressure specified gas, which is a low-pressure gas among the specified gases, to the torch nozzle; The valve is a high-pressure specified gas valve that opens and closes the supply of the high-pressure specified gas to the torch nozzle; a low-pressure specified gas valve that opens and closes the supply of the low-pressure specified gas to the torch nozzle, The setting unit 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 that sets 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.

6. 10. The gouging device of claim 1, The shielding gas and the specific gas are 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 from the shared supply section.

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

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