JP2019162646A - Welding equipment - Google Patents

Abstract

To provide welding equipment in which centering of a nonconsumable electrode for an insert chip is possible and plasma-arc welding and TIG arc welding are switched freely.SOLUTION: Welding equipment comprises: a torch body 4 that a nonconsumable electrode 2 as a cathode generating arc between a welded assembly and a torch nozzle releasing gas toward a welding pool of a welded assembly generated by the arc are attached to; an insert chip 5 as an anode releasing plasma arc for a work with a state surrounding around the torch nozzle; and a positioning mechanism 6 adjusting a relative position for the insert chip 5 of the nonconsumable electrode 2 in a state that the nonconsumable electrode 2 is located inside of the insert chip 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a welding apparatus.

  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 and a torch nozzle is used, an arc is generated between the non-consumable electrode (−) and the work piece (+), and welding is performed by the heat of the arc. Welding is performed while melting a material to form a molten pool (pool). 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, in plasma arc welding, a plasma arc torch including a non-consumable electrode, a water-cooled insert tip (also referred to as a restraint nozzle), and a shield cap is used, and the gap between the non-consumable electrode and the insert tip is used. A plasma gas (also referred to as a working gas) that is electrically converted into plasma is flowed. 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, the plasma arc torch and power supply device provided in the plasma arc system are generally more expensive than the TIG welding torch and power supply device provided in the TIG welding system.

  Therefore, the present applicant converts the TIG welding torch into a plasma arc torch by attaching an attachment (conversion adapter kit) to the TIG welding torch, and can use the non-migration type plasma arc inexpensively and easily. A non-migration type plasma arc system has been proposed (see Patent Document 1 below).

  On the other hand, in plasma arc welding, since the plasma arc is emitted straight from the tip of the insert tip, the central axis of the non-consumable electrode inside the insert tip needs to coincide with the central axis of the insert tip. For this reason, in the conventional plasma arc torch, centering (centering) of the non-consumable electrode is performed using a centering stone (centering piece) that regulates the position of the non-consumable electrode.

  However, such a centering stone has a complicated structure and is expensive. Therefore, there is a demand for a structure that can center a non-consumable electrode without using a centering stone even when a TIG welding torch is converted into a plasma arc torch using the above-described attachment as well as a plasma arc torch. Yes.

International Publication No. 2015/141768

  The present invention has been proposed in view of such conventional circumstances, and can center the non-consumable electrode with respect to the insert tip, and can switch between plasma arc welding and TIG welding. The object is to provide a possible welding device.

In order to achieve the above object, the present invention provides the following means.
(1) a torch body to which a non-consumable electrode serving as a cathode for generating an arc with a workpiece and a torch nozzle for releasing gas toward a molten pool of the workpiece generated by the arc;
An insert tip as an anode that emits a plasma arc to the workpiece while surrounding the periphery of the torch nozzle;
A welding apparatus comprising: a position adjusting mechanism that adjusts a relative position of the non-consumable electrode with respect to the insert tip in a state where the non-consumable electrode is positioned inside the insert tip.
(2) The position adjusting mechanism includes a first slide portion that slidably supports the torch body in a first direction in a plane orthogonal to the non-consumable electrode, and a plane orthogonal to the non-consumable electrode. The welding apparatus according to (1), further comprising a second slide portion that slidably supports the torch body in a second direction orthogonal to the first direction.
(3) The welding according to (2), wherein the position adjustment mechanism includes a third slide portion that slidably supports the torch body in a third direction parallel to the non-consumable electrode. apparatus.
(4) The welding apparatus according to any one of (1) to (3), further including a TIG welding torch including the torch body.
(5) The welding apparatus according to any one of (1) to (4), further including a TIG welding power supply device that supplies electric power and gas to the torch body.
(6) The insert tip has a flow path through which a coolant flows.
The welding apparatus according to any one of (1) to (5), further including a cooling device that is connected to the insert tip and circulates the coolant in the flow path.
(7) The welding apparatus according to any one of (1) to (6), wherein the welding device functions as a TIG welding torch by projecting the non-consumable electrode from a tip of the insert tip.

  As described above, according to the present invention, it is possible to provide a welding apparatus capable of centering a non-consumable electrode with respect to an insert tip and capable of switching between plasma arc welding and TIG welding. Is possible.

It is a perspective view which shows one structural example of the welding apparatus which concerns on one Embodiment of this invention. It is sectional drawing to which the principal part of the welding apparatus shown in FIG. 1 was expanded. It is the cross-sectional perspective view which expanded the principal part of the welding apparatus shown in FIG. It is a top view which shows the torch for TIG welding with which the welding apparatus shown in FIG. 1 is provided. It is sectional drawing which shows a state when performing plasma arc welding of the welding apparatus shown in FIG. It is sectional drawing which shows a state when performing TIG welding of the welding apparatus shown in FIG. It is a photograph which shows the external appearance of a bead when performing keyhole TIG welding using the welding apparatus shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As one embodiment of the present invention, for example, a welding apparatus 1 shown in FIGS. 1 to 6 will be described.
FIG. 1 is a perspective view showing the configuration of the welding apparatus 1. FIG. 2 is an enlarged cross-sectional view of a main part of the welding apparatus 1. FIG. 3 is an enlarged cross-sectional perspective view of a main part of the welding apparatus 1. FIG. 4 is a plan view showing a TIG welding torch included in the welding apparatus 1. FIG. 5 is a cross-sectional view showing a state when TIG welding of the welding apparatus 1 is performed. FIG. 6 is a cross-sectional view illustrating a state when the plasma arc welding of the welding apparatus 1 is performed.

  In the drawings shown below, an XYZ orthogonal coordinate system is set, the X-axis direction is the first direction (front-rear direction) in the horizontal plane of the welding apparatus 1, and the Y-axis direction is the first direction in the horizontal plane of the welding apparatus 1. The second direction (left-right direction) orthogonal to the direction and the Z-axis direction are respectively shown as a third direction (vertical direction) orthogonal to the horizontal plane of the welding apparatus 1.

  The welding apparatus 1 of this embodiment is an automatic welding apparatus capable of switching between plasma arc welding and TIG welding. Specifically, as shown in FIGS. 1 to 3, the welding apparatus 1 is generated by an arc and a non-consumable electrode 2 serving as a cathode that generates an arc with a workpiece (not shown). A torch body 4 to which a torch nozzle 3 for releasing gas toward the molten pool of the workpiece is attached, and an insert as an anode for emitting a plasma arc to the workpiece while surrounding the periphery of the torch nozzle 3 A chip (energizing nozzle) 5 and a position adjusting mechanism 6 that adjusts the relative position of the non-consumable electrode 2 with respect to the insert chip 5 in a state where the non-consumable electrode 2 is positioned inside the insert chip 5 are roughly provided. .

  The torch body 4 is formed by diverting a TIG welding torch, and a general-purpose TIG welding torch that has been conventionally used can also be used. The welding apparatus 1 according to the present embodiment includes a TIG welding power supply device as a power supply device that is connected to the TIG welding torch (torch body 4) and supplies power and gas (plasma gas or shield gas). Yes. That is, in the welding apparatus 1 of this embodiment, the TIG welding power supply apparatus can be used together with the TIG welding torch.

  In addition, in the welding apparatus 1 of this embodiment, not only the TIG welding torch having a single nozzle structure but also a TIG welding torch having a double nozzle structure can be used. Further, the power supply device is not limited to the use of the above-described TIG welding power supply device, and a plasma arc power supply device can also be used.

  The insert tip 5 is formed in a substantially cylindrical shape using, for example, a conductive metal material. In addition, the insert tip 5 has a shape in which the tip side protrudes in the diameter increasing direction and the tip portion is narrowed toward the first center hole 5a.

  A central portion of the insert tip 5 is provided with a first central hole 5a having a circular cross section. The first center hole 5a penetrates the non-consumable electrode 2 protruding from the tip of the torch nozzle 3, and forms a flow path through which gas (plasma gas or shield gas) flows.

  The insert tip 5 is connected to the lower main body portion 7. The lower main body 7 is formed in a substantially cylindrical shape using, for example, a conductive metal material. Further, a lower fixing ring 8 for fixing the insert tip 5 inserted inside the lower main body 7 is provided on the tip (lower end) side of the lower main body 7.

  The lower fixing ring 8 is formed in a substantially cylindrical shape using, for example, a conductive metal material, and has a claw portion 8a that protrudes in the diameter reducing direction on the tip side. On the other hand, a flange portion 5b protruding in the diameter increasing direction is provided on the outer peripheral portion on the proximal end side of the insert tip 5.

  The lower fixing ring 8 is attached to the outer peripheral surface of the lower main body portion 7 by screwing in a state where the claw portion 8a is locked to the flange portion 5b of the insert tip 5 in a state where the insert tip 5 is penetrated. Thereby, the insert tip 5 is fixed to the tip (lower end) side of the lower main body portion 7 via the lower fixing ring 8. A packing P <b> 1 is provided at a position where the insert chip 5 and the lower main body portion 7 meet each other.

  The lower main body 7 is provided with a water jacket (water channel) 9 through which cooling water (cooling liquid) L flows. Further, on the outer peripheral portion of the lower main body portion 7, an inlet side connection portion 10 a for supplying the cooling water L to the water jacket 9 and an outlet side connection portion 10 b for discharging the cooling water L from the water jacket 9. And are provided.

  The welding apparatus 1 according to the present embodiment is connected to the connection portions 10a and 10b of the lower main body portion 7 and circulates the cooling water L flowing through the water jacket 9 of the lower main body portion 7 (not shown). It has. The cooling device is not particularly limited, and a conventionally known cooling device can be used.

  A shield cap 11 is attached to the outer peripheral portion on the distal end side of the lower main body 7. Since the shield cap 11 is not affected by heat as much as the lower main body portion 7 and the insert chip 5, the shield cap 11 is formed in a substantially cylindrical shape using a metal material such as stainless steel or copper alloy, or an insulating material such as ceramics. And the front-end | tip part has the shape narrowed down inside. The shield cap 11 is attached to the outer peripheral portion on the lower end side of the lower main body portion 7 by screwing in a state of surrounding the lower main body portion 7.

  A gas flow path (not shown) through which plasma gas flows is provided inside the lower main body portion 7. Further, a gas connection portion 12 for supplying a shielding gas to the gas flow path is provided on the outer peripheral portion of the lower main body portion 7. Further, a gas flow path 13 through which the shield gas flows is provided inside the shield cap 11 continuously to the gas flow path on the lower body portion 7 side.

  Further, a gas lens 14 a that rectifies the shield gas released from the shield cap 11 and a diffuser 14 b that diffuses the shield gas are provided between the lower main body 7 and the shield cap 11. The gas lens 14 a and the diffuser 14 b are made of a metal mesh member, are formed in a ring shape, and are held inside the shield cap 11 in a state where the lower main body portion 7 is inserted. Note that the gas lens 14a and the diffuser 14b are not necessarily required, and may be omitted if unnecessary.

  In the welding apparatus 1 of the present embodiment, the shield gas can be supplied by a gas supply device (not shown) connected to the gas connection portion 12 of the lower main body portion 7. The gas supply device is not limited as long as it can supply shield gas. For example, any gas cylinder, in-plant gas supply equipment, gas generator (for example, PSA gas generator), gas mixer, etc. It is possible to use.

  The lower main body portion 7 is connected to the upper main body portion 15. The upper body portion 15 is formed in a substantially cylindrical shape using, for example, a conductive metal material. Further, an upper fixing ring 16 that fixes the upper main body 15 inserted inside the lower main body 7 is provided on the base end (upper end) side of the lower main body 7.

  The upper fixing ring 16 is formed in a substantially cylindrical shape using, for example, a metal material, an insulating material, or the like, and has a claw portion 16a that protrudes in the diameter reducing direction on the tip side. On the other hand, a flange portion 15 a protruding in the diameter increasing direction is provided on the outer peripheral portion of the upper main body portion 15.

  The upper fixing ring 16 is screwed onto the outer peripheral surface of the lower main body portion 7 while the claw portion 16a is locked to the flange portion 15a of the upper main body portion 15 with the upper main body portion 15 being penetrated. Yes. As a result, the upper main body 15 is abutted with the base end of the insert tip 5 and the base end of the lower main body 7, and the base (upper end) side of the lower main body 7 via the upper fixing ring 16. It is fixed to. A packing P <b> 2 is provided at a position where the lower main body portion 7 and the upper main body portion 15 meet each other. Further, a packing P3 is provided at a position where the insert chip 5 and the upper main body portion 15 meet each other.

  In the central portion of the upper main body portion 15, a second central hole 15 b having a circular cross section which is continuous with the first central hole 5 a of the insert tip 5 and has a diameter larger than that of the first central hole 5 a, A third central hole 15c having a circular cross section that is larger in diameter than the second central hole 15b and is continuous with the second central hole 15b is provided so as to penetrate in the axial direction.

  An insulating cylinder 17 formed in a cylindrical shape using an insulating material is inserted (fitted) into the second center hole 15b. On the other hand, the torch nozzle 3 is inserted (freely fitted) into the third center hole 15c with a gap in the circumferential direction. The tip of the torch nozzle 3 is in contact with the insulating cylinder 17 and the step surface 15d between the second center hole 15b and the third center hole 15c. Note that the insulating cylinder 17 may be changed to a centering stone, or a centering stone may be arranged inside the insert chip 5. Further, the insulating cylinder 17 and the centering stone may be removed and used depending on the use situation.

  The position adjusting mechanism 6 is orthogonal to the non-consumable electrode 2 and the first slide portion 18 that slidably supports the torch body 4 in a first direction (X-axis direction) in a plane orthogonal to the non-consumable electrode 2. A second slide portion 19 that slidably supports the torch body 4 in a second direction (Y-axis direction) orthogonal to the first direction in the plane, and a third direction (Z And a third slide portion 20 that slidably supports the torch body 4 in the axial direction).

  The first slide part 18 and the second slide part 19 are cross tables attached to a frame (fixed part) 21. The insert chip 5 is fixedly supported on the frame 21. On the other hand, the torch body 4 is slidably supported in a first direction and a second direction via a cross table (the first slide part 18 and the second slide part 19).

  In the welding apparatus 1 of the present embodiment, the center of the non-consumable electrode 2 with respect to the insert tip 5 while sliding the TIG welding torch including the torch body 4 in the first direction and the second direction by the position adjusting mechanism 6. Centering can be performed.

  The third slide part 20 is a lift mechanism supported by the frame 21 and holds a TIG welding torch. The TIG welding torch (torch body 4) is supported to be slidable (lifted and lowered) in the third direction via the lift mechanism (third slide portion 20). Further, the sliding (lifting / lowering) operation of the TIG welding torch (torch body 4) can be performed by rotating the handle 20a of the lift mechanism.

  In the welding apparatus 1 of the present embodiment, the tip of the non-consumable electrode 2 is moved outward from the tip of the insert tip 5 while the position adjusting mechanism 6 slides the TIG welding torch including the torch body 4 in the third direction. It is possible to have a protruding state or a state in which the tip of the non-consumable electrode 2 is drawn inward from the tip of the insert tip 5.

  The first slide portion 18, the second slide portion 19, and the third slide portion 20 are not necessarily limited to the above-described configuration, and a TIG welding torch (torch body 4 for the insert tip 4). ) May be slidably supported in the first, second and third directions.

  The welding apparatus 1 according to the present embodiment provides a wire aiming guide 22 that feeds the filler wire W toward the weld pool of the work piece, and after-shield gas to the weld bead that is formed immediately after the work piece is welded. And an after shield mechanism 23 for discharging.

  The wire aiming guide 22 guides the filler wire W, feeds the filler wire W from the tip side thereof, and a liner (feeding both the conduit and the filler wire W toward the tip of the feed head 22a). 22b). The wire aiming guide 22 is attached to the frame 21 via an attachment jig 24.

  The feed head 22 a has a nozzle shape with the tip side extended toward the tip side of the insert tip 5. Further, the wire aiming guide 22 has a rotating mechanism 22c that rotatably supports the feeding head 22a so that the angle of the feeding head 22a can be adjusted. The liner 22b is connected to a wire feeding device (not shown), and the filler wire can be automatically fed by the wire feeding device.

  The aftershield mechanism 23 has an aftershield nozzle 23a that discharges aftershield gas from the tip side thereof, and an aftershield cover 23b that covers the rear side in the weld line direction from the tip side of the insert tip 5. The after shield nozzle 23 a and the after shield cover 23 b are attached to the frame 21 via an attachment jig 24.

  The aftershield nozzle 23 a has a shape in which the tip side is curved toward the tip side of the insert tip 5. The after shield cover 23b has a shape that covers the rear side in the welding line direction from the tip side of the insert tip 5 in a state where the feeding head 22a and the after shield nozzle 23a are disposed inside. In FIG. 1, a part of the after shield cover 23b is opened.

  In the welding apparatus 1 of this embodiment, aftershield gas can be supplied by a gas supply device (not shown) connected to the aftershield nozzle 23a. The gas supply device may be any device that can supply after-shield gas, such as a gas cylinder, a factory gas supply facility, a gas generator (for example, a PSA gas generator), a gas mixer, etc. Can also be used.

  Note that the wire aiming guide 22 and the aftershield mechanism 23 are not necessarily required in the welding apparatus 1 of the present embodiment, and can be omitted if unnecessary. In addition, the structure can be changed as appropriate.

  In the welding apparatus 1 of the present embodiment having the above-described configuration, when plasma arc welding is performed, the tip of the non-consumable electrode 2 is drawn inward from the tip of the insert tip 5 as shown in FIG. And

  In this state, while plasma gas is emitted from the tip of the insert tip 5, plasma is electrically converted between the non-consumable electrode 2 as the cathode (-) and the insert tip 5 as the anode (+). Flow gas. The plasma flow (plasma jet) generated at this time is narrowed by the insert tip 5, and the energy density is reduced by utilizing the wall effect due to the inner wall shape of the insert tip 5 and the thermal pinch effect obtained by cooling the lower body portion 7. Generate an enhanced plasma arc. Further, the plasma arc is further narrowed down by receiving a thermal pinch effect by the plasma gas emitted from the insert tip 5. As a result, plasma arc welding is performed using a plasma arc having a high energy density and the arc shape being narrowed into a cylindrical shape as a heat source.

The plasma gas and the shielding gas are not particularly limited. For example, an inert gas such as argon (Ar) or helium (He), or a mixture obtained by adding hydrogen (H ₂ ) to argon (Ar). A gas, a mixed gas obtained by adding helium (He) to argon (Ar), or the like can be used. Furthermore, it is possible to use the added ones and combustible gas and nitrogen (N ₂₎ in the inert gas. As the shielding gas, for example, carbon dioxide (CO ₂ ), an inert gas obtained by adding an oxidizing gas such as oxygen (O ₂ ) or carbon dioxide (CO ₂ ), or a flammable gas may be used. .

  On the other hand, in the welding apparatus 1 of the present embodiment, when performing TIG welding, as shown in FIG. 6, the tip of the non-consumable electrode 2 protrudes outward from the tip of the insert tip 5.

In this state, as the inner side shielding gas from the tip of the insert tip 5 (in the case of TIG welding, the inner side shielding nozzle), for example, a mixed gas obtained by adding hydrogen (H ₂ ) to argon (Ar), Double shield TIG welding is performed by generating an arc between the non-consumable electrode 2 and the work piece while releasing a mixed gas of helium (He) added to argon (Ar).

  As described above, in the welding apparatus 1 of the present embodiment, it is possible to switch between plasma arc welding and TIG welding. Moreover, non-migration type plasma arc welding can be performed inexpensively and easily by diverting the TIG welding power supply device together with the TIG welding torch.

  In the present embodiment, the present invention is not necessarily limited to the above-described non-migration type plasma arc welding, and an electric current is generated between the non-consumable electrode 2 as the cathode (−) and the workpiece to be welded as the anode (+). It is also possible to perform a transfer type plasma arc welding in which a current flows.

  Moreover, in the welding apparatus 1 of this embodiment, the relative position adjustment of the non-consumable electrode 2 with respect to the insert tip 5 is performed by the above-described position adjustment mechanism 6 in a state where the non-consumable electrode 2 is positioned inside the insert tip 5. It can be done easily.

  That is, in the welding apparatus 1 of the present embodiment, the torch body 4 (TIG welding torch) is slid in the first direction and the second direction via the first slide portion 18 and the second slide portion 19. However, centering of the non-consumable electrode 2 with respect to the insert tip 5 (centering) can be performed accurately and easily.

  Further, in the welding apparatus 1 of the present embodiment, the tip of the non-consumable electrode 2 is inserted into the insert tip 5 by sliding the torch body 4 (TIG welding torch) through the third slide portion 20 in the third direction. It is possible to switch between a state in which the tip of the non-consumable electrode 2 is pulled inward and a state in which the tip of the non-consumable electrode 2 protrudes outward from the tip of the insert tip 5.

  Thereby, plasma arc welding can be performed in a state where the tip of the non-consumable electrode 2 is drawn inward from the tip of the insert tip 5. On the other hand, TIG welding can be performed in a state where the tip of the non-consumable electrode 2 protrudes outside the tip of the insert tip 5.

  When plasma arc welding is performed using the TIG welding power supply device, the non-consumable electrode 2 is generated after the plasma arc is generated from the state in which the tip of the non-consumable electrode 2 protrudes outside the tip of the insert tip 5. It is preferable that the tip end of the insert tip 5 is pulled inward from the tip end of the insert tip 5. Thereby, it is possible to easily perform non-migration type plasma arc welding using the power supply device for TIG welding.

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, in the welding apparatus 1 of the present embodiment, a plasma arc power supply apparatus (welder) may be used. When a TIG welding power supply device (welding machine) is used, the specification is not particularly limited, and one unit may be used, or a plurality of units may be used in parallel. For example, if two 500 A TIG welding power supply devices (welders) are connected, a 1000 A output TIG welding power supply device is obtained. Moreover, although a commercially available product is used as the TIG welding torch, a dedicated TIG welding torch may be used.

  Moreover, in the welding apparatus 1 of the present embodiment, the insert tip 5 may be used for cooling the non-consumable electrode 2. In that case, the hole diameter of the insert tip 5 is made the same as the outer diameter of the non-consumable electrode 2. Alternatively, the non-consumable electrode 2 can be forcibly cooled by bringing the non-consumable electrode 2 into contact with the inner surface of the hole of the insert tip 5. Thereby, it can be used as a high current TIG welding torch.

  Hereinafter, the effects of the present invention will be made clearer by examples. In addition, this invention is not limited to a following example, In the range which does not change the summary, it can change suitably and can implement.

  In this example, the keyhole TIG welding was actually performed using the welding apparatus 1 under the following welding conditions. Moreover, the external appearance of the bead (back bead of a welding line) when performing keyhole TIG welding using the said welding apparatus 1 is shown in the photograph of FIG.

<Welding conditions>
・ Welding machine: WP-T500P (Daihen Co., Ltd.)
Center gas: Mixed gas of argon and helium (composition: 7% helium, remaining argon, flow rate: 5 L / min)
Outer gas: Argon gas (Composition: Argon 100%, Flow rate 20 L / min)
・ Non-consumable electrode diameter: φ4mm
・ Insert tip diameter: φ6mm
・ Projection length of non-consumable electrode from insert tip: 5mm
・ Welding current: base current 405A, peak current 465A
・ Pulse frequency: 900Hz
・ Welding speed: 50 cm / min
-Material to be welded: Material: SUS304, thickness 6 mm (bead on)

  As shown in FIG. 7, when the welding apparatus 1 is used, the non-consumable electrode 2 can be easily centered (centered) with respect to the insert tip 5, and an appropriate welding result was obtained.

  Moreover, when the welding apparatus 1 is used, keyhole welding by double shield TIG welding can be performed by setting the non-consumable electrode 2 to protrude from the tip of the insert tip 5 in addition to plasma welding. It is.

  DESCRIPTION OF SYMBOLS 1 ... Welding apparatus 2 ... Non-consumable electrode 3 ... Torch nozzle 4 ... Torch body (TIG welding torch) 5 ... Insert tip (energizing nozzle) 6 ... Position adjustment mechanism 7 ... Lower body part 8 ... Lower fixing ring 9 ... Water jacket ( 10a: Inlet side connecting portion 10b ... Outlet side connecting portion 11 ... Shield cap 12 ... Gas connecting portion 13 ... Gas flow path 14a ... Gas lens 14b ... Diffuser 15 ... Upper body portion 16 ... Upper fixing ring 17 ... Insulation Cylinder 18 ... 1st slide part 19 ... 2nd slide part 20 ... 3rd slide part 21 ... Frame 22 ... Wire aiming guide 23 ... After-shield mechanism 24 ... Mounting jig L ... Cooling water (coolant) W ... Filler wire

Claims (7)

A torch body to which is attached a non-consumable electrode as a cathode for generating an arc between the workpiece and a torch nozzle for releasing gas toward the molten pool of the workpiece caused by the arc;
An insert tip as an anode that emits a plasma arc to the workpiece while surrounding the periphery of the torch nozzle;
A welding apparatus comprising: a position adjusting mechanism that adjusts a relative position of the non-consumable electrode with respect to the insert tip in a state where the non-consumable electrode is positioned inside the insert tip.   The position adjusting mechanism includes a first slide portion that slidably supports the torch body in a first direction in a plane orthogonal to the non-consumable electrode, and the first slide in a plane orthogonal to the non-consumable electrode. The welding apparatus according to claim 1, further comprising: a second slide portion that slidably supports the torch body in a second direction perpendicular to the direction.   The welding apparatus according to claim 2, wherein the position adjustment mechanism includes a third slide portion that slidably supports the torch body in a third direction parallel to the non-consumable electrode.   The welding apparatus according to claim 1, further comprising a TIG welding torch including the torch body.   The welding apparatus according to any one of claims 1 to 4, further comprising a TIG welding power supply device that supplies electric power and gas to the torch body. The insert tip has a flow path through which a coolant flows.
The welding apparatus according to claim 1, further comprising a cooling device that is connected to the insert tip and circulates the cooling liquid in the flow path.   The welding apparatus according to any one of claims 1 to 6, wherein the welding device functions as a TIG welding torch by causing the non-consumable electrode to protrude from a tip of the insert tip.