JP6578078B1 - TIG welding torch - Google Patents

Abstract

A torch for TIG welding with improved cooling performance of a non-consumable electrode is provided. A non-consumable electrode 2A that generates an arc with a workpiece, a collet 3A that supports the non-consumable electrode 2A inserted inside, and a state in which the non-consumable electrode 2A protrudes from the tip side. The collet body 5A is provided with a flow path through which the cooling liquid W is circulated and the periphery of the non-consumable electrode 2A is surrounded. A torch nozzle 6A that emits a shielding gas toward the center and a center hole 7a that is attached in a state of being thermally connected to the collet body 5A and that protrudes the non-consumable electrode 2A from the tip thereof while in contact with the collet 3A. The cooling chip 7H is provided, and the cooling chip 7H constitutes a part of the flow path together with the collet body 5A. [Selection] Figure 9

Description

  The present invention relates to a TIG welding torch.

  Conventionally, welding of structures (workpieces) using metals or non-ferrous metals as the base material is non-consumable called TIG welding (Tungsten Inert Gas welding) or GTAW (Gas Tungsten Arc welding) such as plasma arc welding. Electrode-type gas shielded arc welding is used.

  In TIG welding, a TIG welding torch having a non-consumable electrode, a torch nozzle, and a torch body is used, and an arc is generated between the non-consumable electrode (−) and the work piece (+). The object to be welded is melted by this heat to form a molten pool (pool) and welding is performed. Further, during welding, shielding gas is released from a torch nozzle surrounding the periphery of the electrode, and welding is performed while shielding the atmosphere (air) with this shielding gas.

  In contrast, plasma arc welding uses a plasma arc torch including a non-consumable electrode, a water-cooled insert tip (also referred to as a restraint nozzle), a shield cap, and a torch body. A plasma gas (also referred to as working gas) that is electrically converted into plasma is flowed between the chips. The plasma flow (plasma jet) generated at this time is narrowed by the insert tip, and the wall effect (the effect of stabilizing the airflow of the plasma flow) due to the inner wall shape of the insert tip, and the thermal pinch effect obtained by cooling the insert tip A plasma arc having an increased energy density is generated by utilizing (the effect of contraction and high temperature by cooling the plasma flow from the surroundings). Further, the plasma arc is further narrowed down due to the thermal pinch effect caused by the shield gas released from the shield cap.

  In plasma arc welding, welding is performed using a plasma arc having such a high energy density and a reduced arc shape in a cylindrical shape as a heat source. Plasma arcs are classified into a transfer type and a non-transfer type. The transfer-type plasma arc is a method in which a current flows between the non-consumable electrode (−) and the workpiece (+), and can be applied only to a conductive workpiece. On the other hand, the non-migration type plasma arc is a system in which a current flows between the non-consumable electrode (−) and the insert tip (+), and can be applied to a non-conductive workpiece. Furthermore, the plasma arc is used not only for the above-described welding application but also for brazing, joining, cutting, thermal spraying, melting furnace, and the like to the workpiece.

  By the way, in the plasma arc torch described above, a water-cooling type cooling mechanism (chiller) that cools the insert tip by circulating a coolant (water) is used to prevent the insert tip from being damaged by the high temperature plasma arc. ing.

  However, when the insert tip is not cooled due to a chiller failure or the like, the insert tip is not damaged and the torch body is melted. In this case, the cost for repairs and the like will increase.

  Further, the tip portion of the insert tip is not only exposed to a high temperature by the plasma arc, but is also a portion that is heavily consumed due to the influence of adhesion of welding spatter and the like. In this case, since it is necessary to replace not only the tip part of the insert chip having a short life but also the chip itself, the cost due to the replacement also increases.

  Therefore, the applicant of the present application can improve the cooling performance of the insert chip while ensuring the mounting strength of the chip and ease of replacement by providing a chip that can be detachably attached to the tip of the insert chip. A plasma arc torch has been proposed (see Patent Document 1 below).

  Further, even in the TIG welding torch, a cooling mechanism is provided to cool the torch body and the like by circulating a coolant (water).

  On the other hand, in the TIG welding torch, it is necessary to cool the non-consumable electrode in order to suppress the consumption of the non-consumable electrode due to arc heat. In order to increase the cooling effect of the non-consumable electrode, it is necessary to shorten the distance between the tip of the non-consumable electrode and the flow path through which the coolant (water) is circulated as much as possible.

JP 2017-119297 A

  This invention is proposed in view of such a conventional situation, and it aims at providing the torch for TIG welding which improved the cooling performance of the non-consumable electrode.

In order to achieve the above object, the present invention provides the following means.
[1] A non-consumable electrode that generates an arc with the workpiece,
A collet that supports the non-consumable electrode inserted inside;
While holding the collet inside with the non-consumable electrode protruding from the tip side, a collet body provided with a flow path through which a coolant is circulated,
A torch nozzle that discharges a shielding gas toward the weld pool of the work piece caused by the arc in a state of surrounding the non-consumable electrode;
A cooling chip that is attached in a state of being thermally connected to the collet body and that is provided with a center hole that protrudes the non-consumable electrode from the tip of the collet in contact with the tip of the collet.
The cooling tip comprises a part of the flow path together with the collet body.
[2] The TIG welding according to [1], wherein the cooling tip is detachably attached to the collet body in a state of being inserted inward from the tip side of the collet body. For torch.

  As described above, according to the present invention, it is possible to provide a TIG welding torch with improved cooling performance of non-consumable electrodes.

The structure of the torch for TIG which concerns on the 1st Embodiment of this invention is shown, (a) is the sectional drawing, (b) is the top view seen from the front end side. The structure of the torch for TIG which is a 1st modification is shown, (a) is the sectional drawing, (b) is the top view seen from the front end side. The structure of the torch for TIG which is a 2nd modification is shown, (a) is the sectional drawing, (b) is the top view seen from the front end side. The structure of the torch for TIG which is a 3rd modification is shown, (a) is the sectional drawing, (b) is the top view seen from the front end side. The structure of the torch for TIG which is a 4th modification is shown, (a) is the sectional drawing, (b) is the top view seen from the front end side. It is sectional drawing which shows the structure of the torch for TIG which is a 5th modification. It is sectional drawing which shows the structure of the torch for TIG which is a 6th modification. It is a cross-sectional perspective view which shows the structure of the torch for TIG welding which concerns on the 2nd Embodiment of this invention. It is the cross-sectional perspective view which expanded the principal part of the torch for TIG welding shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the drawings used in the following description, in order to make each component easy to see, the scales of the dimensions may be different depending on the component, and the dimensional ratio of each component is not always the same as the actual. Make it not exist.

(First embodiment)
First, for example, a TIG welding torch 1A shown in FIGS. 1A and 1B will be described as a first embodiment of the present invention. FIG. 1A is a cross-sectional view showing the configuration of the TIG welding torch 1A. FIG. 1B is a plan view of the TIG welding torch 1A as viewed from the tip side.

  The TIG welding torch 1A of the present embodiment includes a non-consumable electrode 2 that generates an arc with the workpiece S, a collet 3 that supports the non-consumable electrode 2 inserted therein, and a non-consumable electrode 2 The collet 3 is held on the inner side in a state of protruding from the front end side, and the periphery of the non-consumable electrode 2 is surrounded by a collet body 5 provided with a water jacket (flow path) 4 through which the coolant W is circulated. It is attached to the collet body 5 in a state, and is attached in a state where it is thermally connected to the collet body 5 and a torch nozzle 6 that discharges a shielding gas toward the molten pool of the work piece S generated by the arc. And a cooling chip 7A provided with a central hole 7a for projecting the non-consumable electrode 2 from the tip.

  The non-consumable electrode 2 is composed of a long electrode rod formed using a metal material having a high melting point such as tungsten. For the non-consumable electrode 2, for example, a material to which an oxide such as thorium oxide, lanthanum oxide, cerium oxide, yttrium oxide, or zirconium oxide is added in addition to tungsten can be used.

  The collet 3 is made of a substantially cylindrical member formed using a metal material having excellent electrical conductivity and thermal conductivity, such as copper or a copper alloy. The collet 3 has a through hole 3a penetrating in the axial direction, and supports the non-consumable electrode 2 inserted inside the through hole 3a so as to be slidable in the axial direction. A plurality of slits 3 b are provided in the circumferential direction on the tip side of the collet 3. The plurality of slits 3b are notched in a straight line from the tip of the collet 3 to a midway portion in the axial direction. Thereby, the front-end | tip part 3c between each slit 3b can be elastically deformed to a diameter reduction direction. Further, a tapered portion 3d having a gradually reduced diameter is provided at the tip of the collet 3.

  The collet body 5 is formed of a substantially cylindrical member formed using a material having excellent electrical conductivity and thermal conductivity, such as copper or a copper alloy. The collet body 5 has a through hole 5a penetrating in the axial direction, and holds the collet 3 inserted from the base end side of the through hole 5a inside.

  Further, the through hole 5a of the collet body 5 forms a flow path through which the first shield gas G1 flows. A reduced diameter portion 5b with which the tapered portion 3d of the collet 3 abuts is provided inside the through hole 5a. The reduced diameter portion 5b is reduced in diameter to penetrate the non-consumable electrode 2. Thereby, only the non-consumable electrode 2 which penetrated the through-hole 5a can be protruded from the front-end | tip part of the collet body 5. FIG.

  A center nozzle 5c that discharges the first shield gas G1 supplied through the through hole 5a is provided on the tip side of the collet body 5. Further, the side surface of the collet body 5 is provided with a gas supply port 5d that supplies the first shield gas G1 toward the through hole 5a. On the other hand, a torch cap 8 for closing the rear end side of the through hole 5a is detachably attached to the rear end side of the collet body 5 by screwing.

  The water jacket 4 is connected to a cooling mechanism (chiller) 50 that cools the collet body 5 by circulating a coolant (water) W. As a result, the collet body 5 is cooled by the coolant (water) W flowing through the water jacket 4.

  The torch nozzle 6 has a nozzle shape formed in a substantially cylindrical shape using, for example, ceramic having excellent heat resistance. The torch nozzle 6 forms a flow path through which the second shield gas G2 flows between the outer peripheral surface of the collet body 5 and is detachably attached to the outer peripheral surface of the collet body 5 by screwing. The torch nozzle 6 may have a nozzle shape in which the tip side is gradually reduced in diameter.

  The cooling chip 7A is formed in a substantially cylindrical shape, and is detachably attached to the collet body 5 by being screwed into the collet body 5 while being inserted into the collet body 5 from the front end side of the collet body 5. Further, the cooling chip 7A has a tapered shape with its tip side narrowed down.

  The center hole 7a of the cooling tip 7A projects the non-consumable electrode 2 from the tip thereof while in contact with the non-consumable electrode 2. Further, the cooling chip 7A has a gas discharge port 9 through which the first shield gas G1 is released. The gas discharge port 9 is configured by a plurality of holes 9a provided side by side around the center hole 7a.

  The TIG welding torch 1 </ b> A having the above configuration is connected to the power supply device 60. The power supply device 60 is a DC and / or AC power supply device for TIG welding that is generally used conventionally, and is connected to the TIG welding torch 1 </ b> A via a welding cable (not shown), so that TIG is used. The electric power and the first and second shield gases G1, G2 are supplied to the welding torch 1A.

  In the power supply device 60, the non-consumable electrode 2 is electrically connected to the minus (−) terminal side via the torch side cable 61a, and the work piece is welded to the plus (+) terminal side via the base material side cable 61b. S is electrically connected.

  As a result, an arc is generated between the non-consumable electrode 2 and the workpiece S, and welding is performed while the workpiece S is melted by the heat of the arc to form a molten pool (pool). Further, during welding, the first and second shield gases G1 and G2 are discharged from the torch nozzle 6 surrounding the non-consumable electrode 2, and welding is performed while the atmosphere (air) is blocked by these shield gases G1 and G2. Is called.

The first and second shield gases G1 and G2 are not particularly limited. For example, an inert gas such as argon (Ar) or helium (He), or argon (Ar) with hydrogen (H ₂ ), Helium (He), nitrogen (N ₂ ), or other mixed gas can be used. Alternatively, a mixed gas in which a gas such as hydrogen (H ₂ ) or nitrogen (N ₂ ) is added to a mixed gas of argon (Ar) and helium (He) can be used. For the second shielding gas G2, in addition to the gas having the above-described composition, argon (Ar) or a mixed gas of argon (Ar) and helium (He), for example, carbon dioxide (CO ₂ ) or oxygen (O ₂₎ may be used in which an oxidizing gas is added, such as.

  In the TIG welding torch 1 </ b> A of the present embodiment, the above-described cooling tip 7 </ b> A is attached in a state where it is thermally connected to the collet body 5. Further, the non-consumable electrode 2 is in contact with the cooling chip 7A with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7A.

  That is, in the TIG welding torch 1A of the present embodiment, the non-consumable electrode 2 is thermally connected via the collet body 5 cooled by the circulation of the coolant (water) W and the cooling tip 7A. Yes. Thereby, the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. Further, the cooling chip 7A can be easily replaced.

(First variant)
Next, as a first modification of the present invention, for example, a TIG welding torch 1B shown in FIGS. 2A and 2B will be described.
FIG. 2A is a cross-sectional view showing the configuration of the TIG welding torch 1B. FIG. 2B is a plan view of the TIG welding torch 1B as viewed from the front end side. Moreover, in the following description, about the site | part equivalent to 1A of said TIG welding torches, description is abbreviate | omitted and shall attach | subject the same code | symbol in drawing.

  The TIG welding torch 1B of the present embodiment has basically the same configuration as the TIG welding torch 1A except that the cooling tip 7B is provided instead of the cooling tip 7A provided in the TIG welding torch 1A. Yes.

  Specifically, in the TIG welding torch 1B, the cooling tip 7B has a nozzle portion 7b that protrudes in a cylindrical shape so as to surround the periphery of the plurality of hole portions 9a (gas discharge ports 9) from the tip thereof. Yes. In the case of this configuration, the first shield gas G1 discharged from the plurality of holes 9a (gas discharge ports 9) can be narrowed by the nozzle portion 7b.

  In the TIG welding torch 1B of the present embodiment, the above-described cooling tip 7B is attached in a state of being thermally connected to the collet body 5. Further, the non-consumable electrode 2 is in contact with the cooling chip 7B with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7B.

  That is, in the TIG welding torch 1B of the present embodiment, the non-consumable electrode 2 is thermally connected via the collet body 5 cooled by the circulation of the coolant (water) W and the cooling tip 7B. Yes. Thereby, the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. Further, the cooling chip 7B can be easily replaced.

(Second variant)
Next, as a second modification of the present invention, for example, a TIG welding torch 1C shown in FIGS. 3A and 3B will be described.
FIG. 3A is a cross-sectional view showing the configuration of the TIG welding torch 1C. FIG. 3B is a plan view of the TIG welding torch 1C as viewed from the tip side. Moreover, in the following description, about the site | part equivalent to 1A of said TIG welding torches, description is abbreviate | omitted and shall attach | subject the same code | symbol in drawing.

  The TIG welding torch 1C of the present embodiment has basically the same configuration as the TIG welding torch 1A except that the cooling tip 7C is provided instead of the cooling tip 7A provided in the TIG welding torch 1A. Yes.

  Specifically, in the torch 1C for TIG welding, the cooling tip 7C has a plurality of notches 9b as gas discharge ports 9 instead of the plurality of holes 9a provided in the cooling tip 7A. The plurality of slit portions 9b are provided side by side around the center hole 7a. Moreover, each notch part 9b is formed so that the surrounding surface of the center hole 7a may be notched in an axial direction.

  The cooling chip 7C has a nozzle portion 7b that protrudes in a cylindrical shape so as to surround the periphery of the plurality of notches 9b (gas discharge ports 9) from the tip thereof. In the case of this configuration, the first shield gas G1 discharged from the plurality of notches 9b (gas discharge ports 9) can be narrowed down by the nozzle portion 7b.

  In the TIG welding torch 1 </ b> C of the present embodiment, the cooling tip 7 </ b> C described above is attached in a state of being thermally connected to the collet body 5. Further, the non-consumable electrode 2 is in contact with the cooling chip 7C with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7C.

  That is, in the TIG welding torch 1C of the present embodiment, the non-consumable electrode 2 is thermally connected via the collet body 5 cooled by the circulation of the coolant (water) W and the cooling tip 7C. Yes. Thereby, the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. Further, the cooling chip 7C can be easily replaced.

(Third variant)
Next, for example, a TIG welding torch 1D shown in FIGS. 4A and 4B will be described as a third modification of the present invention.
FIG. 4A is a cross-sectional view showing the configuration of the TIG welding torch 1D. FIG. 4B is a plan view of the TIG welding torch 1D as viewed from the tip side. Moreover, in the following description, about the site | part equivalent to 1A of said TIG welding torches, description is abbreviate | omitted and shall attach | subject the same code | symbol in drawing.

  The TIG welding torch 1D of the present embodiment has basically the same configuration as the TIG welding torch 1A except that the cooling tip 7A is provided instead of the cooling tip 7A provided in the TIG welding torch 1A. Yes.

  Specifically, in this TIG welding torch 1D, the cooling tip 7D has a plurality of notches 9c as gas discharge ports 9 instead of the plurality of holes 9a provided in the cooling tip 7A. The plurality of notches 9c are provided side by side around the center hole 7a. Each notch 9b is formed so as to be cut out in the axial direction while dividing the front end side of the cooling chip 7D in the circumferential direction.

  In the TIG welding torch 1 </ b> D of the present embodiment, the above-described cooling tip 7 </ b> D is attached in a state of being thermally connected to the collet body 5. Further, the non-consumable electrode 2 is in contact with the cooling chip 7D with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7D.

  That is, in the TIG welding torch 1D of the present embodiment, the non-consumable electrode 2 is thermally connected via the collet body 5 cooled by the circulation of the coolant (water) W and the cooling tip 7D. Yes. Thereby, the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. In addition, the cooling chip 7D can be easily replaced.

(Fourth variation)
Next, as a fourth modification of the present invention, for example, a TIG welding torch 1E shown in FIGS. 5A and 5B will be described.
FIG. 5A is a cross-sectional view showing the configuration of the TIG welding torch 1E. FIG.5 (b) is the top view which looked at the torch 1E for TIG welding from the front end side. Moreover, in the following description, about the site | part equivalent to 1A of said TIG welding torches, description is abbreviate | omitted and shall attach | subject the same code | symbol in drawing.

  The TIG welding torch 1E of the present embodiment has basically the same configuration as the TIG welding torch 1A except that the cooling tip 7E is provided instead of the cooling tip 7A provided in the TIG welding torch 1A. Yes.

  Specifically, in the TIG welding torch 1E, the cooling tip 7E has a configuration in which a plurality of holes 9a (gas discharge ports 9) provided in the cooling tip 7A are omitted. Thereby, the TIG welding torch 1E of the present embodiment is configured to release only the second shield gas G2 from the torch nozzle 6.

  In the TIG welding torch 1E of the present embodiment, the above-described cooling tip 7E is attached in a state of being thermally connected to the collet body 5. Further, the non-consumable electrode 2 is in contact with the cooling chip 7E with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7E.

  That is, in the TIG welding torch 1E of the present embodiment, the non-consumable electrode 2 is thermally connected via the collet body 5 cooled by the circulation of the coolant (water) W and the cooling tip 7E. Yes. Thereby, the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. In addition, the cooling chip 7E can be easily replaced.

(Fifth variant)
Next, as a fifth modification of the present invention, for example, a TIG welding torch 1F shown in FIG. 6 will be described.
FIG. 6 is a cross-sectional view showing the configuration of the TIG welding torch 1F. Moreover, in the following description, about the site | part equivalent to 1A of said TIG welding torches, description is abbreviate | omitted and shall attach | subject the same code | symbol in drawing.

  The TIG welding torch 1F of the present embodiment has basically the same configuration as the TIG welding torch 1A except that the cooling tip 7F is provided instead of the cooling tip 7A provided in the TIG welding torch 1A. Yes.

  Specifically, in the TIG welding torch 1F, the cooling tip 7F has a configuration in which a plurality of holes 9a (gas discharge ports 9) provided in the cooling tip 7A are omitted. Accordingly, the TIG welding torch 1F of the present embodiment is configured to release only the second shield gas G2 from the torch nozzle 6.

  The cooling chip 7F constitutes a part of the water jacket 4 together with the collet body 5. Therefore, the collet body 5 constituting the water jacket 4 and the cooling tip 7F are sealed (sealed) by the O-ring 10 in a liquid-tight manner. As a result, the cooling chip 7F is cooled by the coolant (water) W flowing through the water jacket 4 together with the collet body 5.

  In the TIG welding torch 1F of the present embodiment, the cooling tip 7F described above is attached in a state of being thermally connected to the collet body 5, and the collet body 5 and the cooling tip 7F are connected by circulation of the coolant (water) W. It is cooling. Further, the non-consumable electrode 2 is in contact with the cooling chip 7F with the tip of the non-consumable electrode 2 protruding from the center hole 7a of the cooling chip 7F.

  That is, in the TIG welding torch 1F of the present embodiment, the cooling tip 7F cooled by the circulation of the coolant (water) W and the non-consumable electrode 2 are thermally connected. Thereby, the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. Further, the cooling chip 7F can be easily replaced.

(Sixth variant)
Next, for example, a TIG welding torch 1G shown in FIG. 7 will be described as a sixth modification of the present invention.
FIG. 7 is a cross-sectional view showing the configuration of the TIG welding torch 1G. Moreover, in the following description, about the site | part equivalent to 1A of said TIG welding torches, description is abbreviate | omitted and shall attach | subject the same code | symbol in drawing.

  The TIG welding torch 1G of the present embodiment has basically the same configuration as the TIG welding torch 1A except that the cooling tip 7G is provided instead of the cooling tip 7A provided in the TIG welding torch 1A. Yes.

  Specifically, in the TIG welding torch 1G, the cooling tip 7G has a configuration in which a plurality of holes 9a (gas discharge ports 9) provided in the cooling tip 7A are omitted. Thereby, the TIG welding torch 1G of the present embodiment is configured to release only the second shield gas G2 from the torch nozzle 6.

  In addition, the central hole 7a of the cooling chip 7G is provided with a reduced diameter portion 7c that is in contact with the tip of the non-consumable electrode 2 instead of the reduced diameter portion 5b. The reduced diameter portion 7c is reduced in diameter so as to penetrate the tip portion of the non-consumable electrode 2. Thereby, only the front-end | tip part (taper-shaped part) of the non-consumable electrode 2 which penetrated the center hole 7a can be protruded from the front-end | tip part of the cooling chip 7G.

  In the TIG welding torch 1G of the present embodiment, the above-described cooling tip 7G is attached in a state of being thermally connected to the collet body 5. Further, the non-consumable electrode 2 is in contact with the cooling chip 7G in a state where the tip of the non-consumable electrode 2 protrudes from the center hole 7a of the cooling chip 7G.

  That is, in the TIG welding torch 1G of the present embodiment, the non-consumable electrode 2 is thermally connected via the collet body 5 cooled by the circulation of the coolant (water) W and the cooling tip 7G. Yes. Thereby, the cooling effect of the non-consumable electrode 2 can be improved, and the consumption of the non-consumable electrode 2 due to arc heat can be suppressed. In addition, the cooling chip 7G can be easily replaced.

(Second Embodiment)
Next, as a second embodiment of the present invention, for example, a TIG welding torch 1H shown in FIGS. 8 and 9 will be described.
FIG. 8 is a cross-sectional perspective view showing the configuration of the TIG welding torch 1H. FIG. 9 is an enlarged cross-sectional perspective view of the main part of the TIG welding torch 1H. Moreover, in the following description, about the site | part equivalent to 1A of said TIG welding torches, description is abbreviate | omitted and shall attach | subject the same code | symbol in drawing.

  The TIG welding torch 1H of the present embodiment is a state in which a non-consumable electrode 2A for generating an arc with the work piece S (not shown in FIGS. 8 and 9) and a non-consumable electrode 2A are inserted inside. The collet body 5A is provided with a water jacket (flow path) 4A that holds the collet 3A supported by the above and the collet 3A in a state in which the non-consumable electrode 2A protrudes from the tip side and in which the coolant W is circulated. And the torch body 11 to which the collet body 5A is attached and the torch body 11 in a state of surrounding the non-consumable electrode 2A, and the shielding gas is released toward the molten pool of the work piece S caused by the arc. The torch nozzle 6A and the collet body 5A are attached in a thermally connected state, and the non-consumable electrode 2A is projected from the tip. Kokoroana 7a is provided with schematically a cooling tip 7H provided.

  Among these, the non-consumable electrode 2 </ b> A has the same configuration as the non-consumable electrode 2, but a longer one than the non-consumable electrode 2 is used in the present embodiment. The collet 3A has the same configuration as the collet 3 such as the through hole 3a, the plurality of slits 3b, the tip portion 3c, and the taber portion 3d. In this embodiment, however, the collet 3A is more than the collet 3A. A long one is used.

  The collet body 5A has the same configuration as the collet body 5 such as a through-hole 5a, a center nozzle 5c, and a gas supply port 5d (not shown in FIGS. 8 and 9). The longer one is used. A torch cap 8A is detachably attached to the rear end side of the collet body 5A by screwing. The torch cap 8A is provided with a gas supply port 8a for supplying the first shield gas G1 toward the through hole 5a.

  The torch body 11 has, for example, an outer cylinder member 12 formed in a substantially cylindrical shape using a steel material such as mild steel or stainless steel, brass, or the like, and an insulating member 13 formed in a substantially cylindrical shape using an insulating resin. is doing.

   The outer cylinder member 12 forms a power feeding unit that supplies power to the non-consumable electrode 2A. The through-hole 12a formed inside the outer cylinder member 12 has the non-consumable electrode 2A disposed at the center thereof, and the first shield from the periphery of the non-consumable electrode 2A toward the through-hole 5a of the collet body 5A. A flow path for supplying the gas G1 is formed.

  The collet body 5A is detachably attached to the outer cylinder member 12 by screwing in a state of being inserted inside the through hole 12a. Moreover, the outer cylinder member 12 forms a flow path through which the second shield gas G2 flows between the outer peripheral surface of the collet body 5A.

  The insulating member 13 covers the outer periphery of the collet body 5A and is detachably attached to the outer cylinder member 12 by being screwed into the outer cylinder member 12 while being inserted inside the through hole 12a.

  Between the collet body 5 </ b> A and the outer cylinder member 12, a water jacket (flow path) 14 through which the coolant (water) W is circulated is provided. The water jacket 14 is composed of a ring-shaped groove 12b that cuts out the inner peripheral surface of the outer cylinder member 12 in the circumferential direction and the outer peripheral surface of the collet body 5A. Further, between the collet body 5 </ b> A constituting the water jacket 14 and the outer cylinder member 12 is sealed (sealed) by an O-ring 15. The O-rings 15 are arranged on both sides in the axial direction with the water jacket 14 interposed therebetween.

  The water jackets 4A and 14 are connected to a cooling mechanism (chiller) 50 (not shown in FIGS. 8 and 9) that cools the collet body 5A by circulating a coolant (water) W. As a result, the collet body 5A is cooled by the coolant (water) W flowing through the water jackets 4A and 14.

  The torch nozzle 6A has the same configuration as the torch nozzle 6, but in this embodiment, the torch nozzle 6A forms a flow path through which the second shield gas G2 flows between the outer periphery of the collet body 5A and the outer cylinder. The member 12 is detachably attached to the outer peripheral surface of the member 12 by screwing. The torch nozzle 6A has a nozzle shape in which the tip side is gradually reduced in diameter.

  The cooling chip 7H is formed in a substantially cylindrical shape, and is detachably attached to the collet body 5A by screwing in a state of being inserted inward from the tip side of the collet body 5A. Further, a flange portion 7d protruding in the diameter expansion direction is provided at the tip of the cooling tip 7H. The cooling tip 7H is attached in a state where the flange portion 7d is in contact with the tip of the collet body 5A.

  The cooling tip 7H is in contact with the collet 3A. Specifically, a reduced diameter portion 7e with which the tapered portion 3d of the collet 3A abuts is provided inside the center hole 7a. The reduced diameter portion 7e is reduced in diameter to penetrate the non-consumable electrode 2A. As a result, only the non-consumable electrode 2A penetrating through the center hole 7a can be projected from the tip of the cooling chip 7H.

  The cooling chip 7H constitutes a part of the water jacket 4A together with the collet body 5A. For this reason, the collet body 5A constituting the water jacket 4A and the cooling tip 7H are liquid-tightly sealed (sealed) by the O-ring 10A. Thereby, the cooling chip 7H is cooled by the coolant (water) W flowing through the water jacket 4A together with the collet body 5A.

  The TIG welding torch 1H having the above configuration is connected to a power supply device 60 (not shown in FIGS. 8 and 9). The power supply device 60 is connected to the TIG welding torch 1H via a welding cable (not shown), and supplies power to the TIG welding torch 1H and the first and second shield gases G1 and G2. .

  In the power supply device 60, although not shown, the non-consumable electrode 2A is electrically connected to the minus (−) terminal side via the torch side cable 61a, and the base material side cable 61b is located on the plus (+) terminal side. The work piece S is electrically connected via the.

  As a result, an arc is generated between the non-consumable electrode 2A and the workpiece S, and welding is performed while the workpiece S is melted by the heat of the arc to form a molten pool (pool). Further, during welding, the first and second shield gases G1 and G2 are discharged from the torch nozzle 6A surrounding the non-consumable electrode 2A, and welding is performed while the atmosphere (air) is blocked by these shield gases G1 and G2. Is called.

  In the TIG welding torch 1H of the present embodiment, the cooling tip 7H described above is attached in a state of being thermally connected to the collet body 5 and the collet 3A, and the cooling body (water) W is circulated to cool the collet body 5A. The chip 7H is cooled.

  That is, in the TIG welding torch 1H of the present embodiment, the cooling tip 7H cooled by the circulation of the coolant (water) W and the collet 3A are in a thermally connected state. Thereby, the cooling effect of the non-consumable electrode 2A thermally connected to the collet 3A can be improved, and the consumption of the non-consumable electrode 2A due to arc heat can be suppressed. Further, the cooling chip 7H can be easily replaced.

In addition, this invention is not necessarily limited to the thing of the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, the cooling chips 7A to 7D and 7G are part of the water jacket 4 together with the collet body 5 and cooled by the cooling liquid (water) W flowing through the water jacket 4 in the same manner as the cooling chip 7F. It is also possible to adopt a configuration.

  In the TIG welding torches 1A to 1H, the tips of the non-consumable electrodes 2 and 2A protrude outward from the tips of the cooling tips 7A to 7H. It can also be used as a plasma arc torch by being pulled inward from the tips of the cooling tips 7A to 7H. Further, by changing the constraining tip provided at the tip of the conventional plasma arc torch to the cooling tips 7A to 7H of the present invention, it is possible to convert the plasma arc torch to the TIG welding torch.

  1A to 1H ... TIG welding torch 2, 2A ... non-consumable electrode 3, 3A ... collet 4, 4A ... water jacket (flow channel) 5, 5A ... collet body 6, 6A ... torch nozzle 7A-7H ... cooling tip 7a ... center Hole 7b ... Nozzle part 8, 8A ... Torch cap 9 ... Gas discharge port 9a ... Hole part 9b, 9c ... Notch part 10, 10A ... O-ring 11 ... Torch body 12 ... Outer cylinder member 13 ... Insulating member 14 ... Water jacket 15 ... O-ring 50 ... Cooling mechanism (chiller) 60 ... Power supply G1 ... First shield gas G2 ... Second shield gas

Claims (2)

A non-consumable electrode that generates an arc with the work piece;
A collet that supports the non-consumable electrode inserted inside;
While holding the collet inside with the non-consumable electrode protruding from the tip side, a collet body provided with a flow path through which a coolant is circulated,
A torch nozzle that discharges a shielding gas toward the weld pool of the work piece caused by the arc in a state of surrounding the non-consumable electrode;
A cooling chip that is attached in a state of being thermally connected to the collet body and that is provided with a center hole that protrudes the non-consumable electrode from the tip of the collet in contact with the tip of the collet.
The cooling tip comprises a part of the flow path together with the collet body.   2. The TIG welding torch according to claim 1, wherein the cooling tip is detachably attached to the collet body in a state of being inserted inward from the tip side of the collet body.

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