JP7525549B2 - Aftershield fixtures and welding equipment - Google Patents

Description

The present invention relates to an aftershield jig and welding equipment.

To weld structures (workpieces) that use metals or non-ferrous metals as base materials, non-consumable electrode gas-shielded arc welding, also known as TIG (Tungsten Inert Gas welding) or GTAW (Gas Tungsten Arc welding), such as plasma arc welding, has traditionally been used.

Consumable electrode gas-shielded arc welding, also known as GMAW (Gas Metal Arc Welding), is used, which includes MIG (Metal Inert Gas Welding), MAG (Metal Active Gas Welding), and CO2 arc welding. Note that consumable electrode gas-shielded arc welding is also called semi-automatic arc welding, since welding is performed manually while the welding wire, which serves as the consumable electrode, is fed automatically.

In these welding methods, a welding torch is generally used to generate an arc between the electrode and the workpiece, and the heat from this arc melts the workpiece to form a molten pool while welding is performed. In addition, during welding, shielding gas is released from the torch nozzle surrounding the electrode, and welding is performed while blocking the atmosphere (air) with this shielding gas.

However, there are cases where the shielding gas released from the torch nozzle alone is not enough to prevent oxidation of the weld bead formed immediately after welding. In such cases, an after-shield jig is provided that surrounds the weld bead from the torch nozzle toward the rear in the weld line direction, and the weld bead formed immediately after welding is isolated from the atmosphere (air) by the after-shield gas released from this after-shield jig (see, for example, Patent Documents 1 and 2). In particular, with titanium welding, there is a strong tendency for the strength of the welded part to decrease due to oxidation of titanium, so welding methods using after-shield gas are often used.

Japanese Patent Application Publication No. 7-100650 JP 2006-175475 A

Incidentally, the above-mentioned Patent Document 1 discloses an aftershield device that is made up of a front unit disposed behind a welding torch, at least one extension unit connected to the rear of the front unit, and a rear unit connected to the rear of the extension unit, and that supplies shielding gas to the extension unit around the welded area.

However, while this aftershield device can be used when the welded area is flat, it becomes difficult to use when the welded area is curved because the device has poor conformity to the welded area.

On the other hand, the above-mentioned Patent Document 2 discloses an aftershield jig for welding in which a trailer is made of a thin metal piece in the shape of a semi-split cylinder with an open bottom, making it deformable, and an inert gas discharge pipe is movably arranged inside the trailer, the pipe also being made of a thin metal piece in the shape of a cylinder, making it deformable.

However, because this welding aftershield jig has a cylindrical inert gas discharge pipe installed inside the trailer, there are limitations to the diameter of the pipes that can be used when welding curved surfaces such as pipes. It is particularly difficult to weld small diameter pipes.

When performing aftershielding on the curved surfaces of the workpieces, such as the above-mentioned pipes and containers, an inexpensive and simple structure is required. In addition, the gap between the curved surface of the workpiece and the aftershield jig needs to be as narrow as possible. For this reason, with conventional aftershield jigs, it is difficult to align them with the workpieces.

The present invention was proposed in light of the above-mentioned conventional circumstances, and aims to provide an aftershield jig that has a simple structure and is easy to align with the shape of the workpiece to be welded, as well as a welding device equipped with such an aftershield jig.

In order to achieve the above object, the present invention provides the following means.
[1] An after-shield jig that discharges an after-shield gas from a torch nozzle of a welding torch that performs welding by generating an arc between a workpiece and the torch nozzle and discharges an after-shield gas toward a rear of the weld line direction toward a weld bead formed immediately after welding of the workpiece,
An adapter that is detachably attached to the torch nozzle;
two or more shield attachments detachably attached to the adapter;
one or more aftershield nozzles for injecting an aftershield gas from inside the shielding attachment;
The shield attachment has a different shape that covers the tip side of the torch nozzle and the rear side in the weld line direction in accordance with the shape of the workpiece.
[2] The aftershield jig described in [1], characterized in that it includes a flat shield attachment corresponding to the flat shape of the workpiece, and a curved shield attachment corresponding to the curved shape of the workpiece.
[3] The aftershield jig according to [2], further comprising an extension shield attachment that can be detachably attached to the flat shield attachment or the curved shield attachment.
[4] The aftershield jig described in [1], further comprising an insulating member disposed between the torch nozzle and the adapter to electrically insulate the torch nozzle from the adapter.
[5] The aftershield jig described in [1], characterized in that the aftershield nozzles are arranged in a row in the weld line direction, and each adjacent aftershield nozzle is configured with an independent hole portion.
[6] The aftershield jig described in [1], characterized in that a diffusion member for diffusing and spraying the aftershield gas is attached to the tip of the aftershield nozzle.
[7] An imaging attachment that is detachably attached to the adapter,
The aftershield jig described in [1] above, characterized in that a camera unit that images the state of the weld bead is attached to the imaging attachment.
[8] The aftershield jig according to [1], characterized in that the adapter is provided with a cooling mechanism that is cooled by circulating a cooling liquid.
[9] The aftershield jig according to [1], characterized in that the shield attachment is provided with a cooling mechanism that is cooled by circulating a cooling liquid.
[10] A welding torch that performs welding by generating an arc between a workpiece and the torch nozzle while discharging a shielding gas from the torch nozzle;
an after-shield jig that emits an after-shield gas from the torch nozzle toward the rear in the weld line direction toward a weld bead formed immediately after welding of the workpiece,
A welding device characterized in that the aftershield jig described in any one of [1] to [9] is used as the aftershield jig.

As described above, the present invention makes it possible to provide an aftershield jig that has a simple structure and is easy to align with the shape of the workpiece, as well as a welding device equipped with such an aftershield jig.

1 is a schematic diagram showing a configuration of a welding device equipped with an aftershield jig according to an embodiment of the present invention. 1 is a side view showing a state in which a flat shield attachment and an imaging attachment are attached to an adapter in an aftershield jig shown as a first usage form, and welding is performed on a flat plate-shaped workpiece. FIG. FIG. 3 is an exploded side view showing the configuration of the aftershield jig shown in FIG. 2 . FIG. 2 is a perspective view of the adapter as seen from above. FIG. 2 is a perspective view of the adapter as seen from below. 13 is a perspective view showing a state in which a flat shield attachment and an extension shield attachment are attached to an adapter in an aftershield jig shown as a second usage form. FIG. FIG. 7 is a perspective view of the aftershield jig shown in FIG. 6 as viewed from below. FIG. 13 is a side view showing a state in which a curved shield attachment and an imaging attachment are attached to an adapter in an aftershield jig shown as a third usage form, and welding is performed on a cylindrical workpiece. FIG. 9 is an exploded side view showing the configuration of the aftershield jig shown in FIG. 8 . FIG. 9 is a perspective view showing a configuration of the aftershield jig shown in FIG. 8 .

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
In addition, the drawings used in the following description may show characteristic parts in an enlarged scale for the sake of convenience in order to make the characteristics easier to understand, and the dimensional ratios of each component may not necessarily be the same as in reality. Furthermore, the materials, dimensions, etc. exemplified in the following description are merely examples, and the present invention is not necessarily limited to them, and may be appropriately modified and implemented within the scope of the present invention.

[Welding system and welding equipment]
First, as an embodiment of the present invention, a welding system 100 shown in Fig. 1 will be described. Fig. 1 is a schematic diagram showing the configuration of the welding system 100.

As shown in FIG. 1, the welding system 100 of this embodiment includes a welding device 20, a wire feeder 30, a welding power supply device 40, an after-shield gas supply device 50, and a control device 60.

The welding device 20 is equipped with a non-consumable welding torch (TIG welding torch) 21, which has been conventionally used, and an aftershield jig 1 that can be detachably attached to the welding torch 21.

The welding torch 21 has a non-consumable electrode 22 that generates an arc between the workpiece (base material) S and the non-consumable electrode 22, and a torch nozzle 23 that releases shielding gas toward the molten pool (pool) of the workpiece S created by the arc. Welding is performed by generating an arc between the workpiece S and the non-consumable electrode 22 and the base material S while releasing shielding gas from the torch nozzle 23.

The aftershield jig 1 emits aftershield gas from the torch nozzle 23 of the welding torch 21 toward the rear in the weld line direction toward the weld bead formed immediately after welding the workpiece S. This isolates the weld bead from the atmosphere (air) and makes it possible to suppress oxidation of the weld bead.

The wire feeder 30 has a filler guide 31 attached to the welding torch 21, and feeds the filler wire W from the tip of the filler guide 31 toward the molten pool of the workpiece S. The wire feeder 30 is also electrically connected to the control device 60 via a control cable 32.

The welding power supply 40 is a DC and/or AC TIG welding power supply that has been commonly used in the past, and is connected to the welding torch 21 via a welding cable 41 to supply power and shielding gas to the welding torch 21. The welding power supply 40 is also electrically connected to the control device 60 via a control cable 42.

The cooling method for the welding torch 21 may be either water-cooled or air-cooled. In the case of a water-cooled type, a cooling device (chiller) is provided and the welding torch 21 can be cooled by circulating cooling water (cooling liquid).

In the welding power supply device 40, the non-consumable electrode 22 is electrically connected to the negative (-) terminal side via a welding cable 41, and the workpiece S is electrically connected to the positive (+) terminal side via a base material side cable 43.

The after-shield gas supply device 50 supplies after-shield gas to the after-shield jig 1 via a gas hose 51. The after-shield gas supply device 50 is electrically connected to the control device 60 via a control cable 52. The after-shield gas supply device 50 may be anything capable of supplying after-shield gas, and may be, for example, a gas cylinder, in-factory gas supply equipment, a gas generator (e.g., a PSA gas generator), a gas mixer, or the like.

The control device 60 controls the wire feeder 30, the welding power supply 40, and the after-shield gas supply device 50, and controls the welding current, the feed speed of the filler wire W, the flow rate (flow rate) of the shield gas and after-shield gas, etc. according to the welding conditions.

In the welding system 100 configured as described above, an arc is generated between the workpiece S and the non-consumable electrode 22 using the welding torch 21, and welding is performed while melting the workpiece S with the heat of the arc to form a molten pool.

During welding, shielding gas is released from the torch nozzle 23 surrounding the non-consumable electrode 22, and welding is performed while blocking the atmosphere (air) with this shielding gas. Also, during welding, a filler wire W is automatically fed toward the molten pool of the workpiece S, and welding is performed while melting the filler wire W in the arc. Furthermore, welding is performed while blocking the weld bead formed immediately after welding from the atmosphere (air) with after-shield gas released from the after-shield jig 1.

The shielding gas and after-shielding gas can be appropriately selected according to the material of the workpiece S. For example, an inert gas such as argon or helium can be used alone or in combination with multiple inert gases. Furthermore, hydrogen, nitrogen, etc. can be added to these shielding gases.

In addition, when the same gas is used as the shielding gas and the after-shielding gas, the after-shielding gas supply device 50 may be omitted, and the shielding gas and the after-shielding gas may be supplied from the welding power supply device 40 to the welding torch 21 and the after-shielding jig 1. In addition, an after-shielding gas supply pipe may be provided that branches off from the shielding gas supply pipe that supplies shielding gas from the welding power supply device 40 to the welding torch 21 and supplies after-shielding gas to the after-shielding jig 1.

[Aftershield jig]
Next, an aftershield jig 1 shown in, for example, FIGS. 2 to 10 will be described as one embodiment of the present invention.

In addition, FIG. 2 is a side view showing a state in which the flat shield attachment 3 and the imaging attachment 5 are attached to the adapter 2 in the aftershield jig 1 shown as the first usage form, and welding is performed on the flat plate-shaped workpiece S1. FIG. 3 is an exploded side view showing the configuration of the aftershield jig 1 shown in FIG. 2. FIG. 4 is a perspective view of the adapter 2 seen from above. FIG. 5 is a perspective view of the adapter 2 seen from below. FIG. 6 is a perspective view showing a state in which the flat shield attachment 3 and the extended shield attachment 6 are attached to the adapter 2 in the aftershield jig 1 shown as the second usage form. FIG. 7 is a perspective view of the aftershield jig 1 shown in FIG. 6 seen from below. FIG. 8 is a side view showing a state in which the curved shield attachment 4 and the imaging attachment 5 are attached to the adapter 2 in the aftershield jig 1 shown as the third usage form, and welding is performed on the cylindrical workpiece S2. FIG. 9 is an exploded side view showing the configuration of the aftershield jig 1 shown in FIG. 8. FIG. 10 is a perspective view showing the configuration of the aftershield jig 1 shown in FIG. 8.

The aftershield jig 1 of this embodiment includes an adapter 2 that can be detachably attached to the torch nozzle 23, and two or more (two in this embodiment) shield attachments 3 and 4, an imaging attachment 5, and an extension shield attachment 6 that can be detachably attached to the adapter 2.

The aftershield jig 1 of this embodiment can be selectively used in the following first to third modes by replacing the attachments 3, 4, 5, and 6 attached to the adapter 2.

(First Usage Form)
As a first usage form, the aftershield jig 1 of this embodiment can be used to attach a flat shield attachment 3 and an imaging attachment 5 to an adapter 2, as shown in Figures 2 and 3, to perform welding on a flat workpiece S1.

Specifically, in this first mode of use, the adapter 2 has an adapter body 7 that covers the tip side of the torch nozzle 23 to the rear side in the welding line direction, a cylindrical insulating member 8 interposed between the torch nozzle 23 and the adapter body 7, and an aftershield nozzle 9 that sprays aftershield gas from inside the adapter body 7.

The adapter body 7 is made of, for example, a non-ferrous metal such as an aluminum alloy or a magnesium alloy, a metal, or a heat-resistant and flame-retardant resin. The adapter body 7 has a ring portion 7a into which the torch nozzle 23 and the insulating member 8 are inserted, and a block portion 7b extending from the ring portion 7a toward the rear side in the direction of the welding line, and the ring portion 7a is detachably attached to the outer periphery of the torch nozzle 23 by means of screws or the like.

The adapter body 7 is provided with a cooling mechanism 10 that is cooled by the circulation of cooling water (cooling liquid). The cooling mechanism 10 has a liquid flow path (not shown) through which the cooling water is circulated, an inlet connection 10a that supplies the cooling water to the liquid flow path, and an outlet connection 10b that discharges the cooling water from the liquid flow path. The liquid flow path is located inside the block portion 7b (adapter body 7). The inlet and outlet connection portions 10a, 10b are located on the upper surface of the block portion 7b (adapter body 7).

In the cooling mechanism 10, a cooling device (chiller) is connected to these connection parts 10a and 10b, and the cooling water is circulated in the liquid flow path, thereby making it possible to cool the adapter body 7.

The insulating member 8 is made of heat-resistant and flame-retardant insulating resin, has a through hole 8a that penetrates in the axial direction, and is formed in a substantially cylindrical shape. The insulating member 8 is disposed between the torch nozzle 23 and the adapter body 7, and electrically insulates the torch nozzle 23 from the adapter body 7.

The underside of the adapter body 7 is provided with a hole 9a that forms the aftershield nozzle 9, and a groove 9b that extends from the tip (lower end) of the hole 9a in the direction of the weld line. The upper surface of the block portion 7b (adapter body 7) is provided with a connection portion 9c for introducing backshield gas into the hole 9a (aftershield nozzle 9).

A diffusion member 11 that diffuses and sprays the aftershield gas is attached to the tip of the aftershield nozzle 9. The diffusion member 11 is made of a porous metal body called a silencer, and is attached by screwing from the underside of the block portion 7b to the inside of the hole portion 9a.

The flat shield attachment 3 is made of, for example, a non-ferrous metal such as an aluminum alloy or a magnesium alloy, a metal, or a heat-resistant and flame-retardant resin, and is detachably attached to the underside of the adapter body 7 (adapter 2) by means of screws or the like.

The underside of the flat shield attachment 3 has a flat shape that corresponds to the planar shape of the workpiece S1 and covers the rear side in the weld line direction from the tip side of the torch nozzle 23. The flat shield attachment 3 also has a groove 3a that is continuous with the groove 9b of the adapter body 7 (adapter 2), and a slit 3b that cuts out the underside of the groove 3a in the weld line direction (see Figure 7).

This allows the aftershield nozzle 9 to spray the aftershield gas from inside the planar shield attachment 3 along the planar shape of the workpiece S1.

The imaging attachment 5 is made of, for example, a non-ferrous metal such as an aluminum alloy or a magnesium alloy, a metal, or a heat-resistant and flame-retardant resin, and is detachably attached to the rear surface of the adapter body 7 (adapter 2) by means of screws or the like.

A camera unit 12 that captures images of the state of the weld bead is attached to the imaging attachment 5 via an insulating tube 13. The imaging attachment 5 has a through hole (not shown) that is continuous with the insulating tube 13. Meanwhile, the adapter body 7 has a through hole 7c that runs between the bottom surface and the rear surface so as to be continuous with the through hole of the imaging attachment 5 (see FIG. 5).

The camera unit 12 has a camera body 12a that photoelectrically converts light received by an image sensor such as a CCD or CMOS sensor and outputs it as an electrical signal, a lens cover 12b that houses a lens barrel attached to the front of the camera body 12a, a cooling gas inlet 12c that introduces cooling gas into the inside of the lens cover 12b by connecting to a cooling gas supply mechanism (not shown), a connecting tube 12d that connects to the insulating tube 13, and a spacer 12e that is interposed between the connecting tube 12d and the lens cover 12b.

The insulating tube 13 is made of heat-resistant and flame-retardant insulating resin and is formed into a substantially cylindrical shape. The insulating tube 13 is disposed between the imaging attachment 5 and the connection tube 12d (camera unit 12) to electrically insulate the imaging attachment 5 from the camera unit 12.

The imaging attachment 5 is also provided with a cooling mechanism 14 that is cooled by the circulation of a cooling liquid. The cooling mechanism 14 has a liquid flow path (not shown) through which the cooling water is circulated, an inlet connection 14a that supplies the cooling water to the liquid flow path, and an outlet connection 14b that discharges the cooling water from the liquid flow path. The liquid flow path is located inside the imaging attachment 5. The inlet and outlet connection parts 14a and 14b are located on the top surface of the imaging attachment 5.

In the cooling mechanism 14, a cooling device (chiller) is connected to these connection parts 14a and 14b, and the cooling water is circulated in the liquid flow path, making it possible to cool the imaging attachment 5.

When welding is performed on the flat workpiece S1 shown in FIG. 2 using the aftershield jig 1 of the first usage form having the above-described configuration, aftershield gas is released from the aftershield nozzle 9 onto the weld bead formed immediately after welding the workpiece S1.

As a result, in the first mode of use, after-shield gas can be appropriately released to the weld bead formed immediately after welding the flat workpiece S1, isolating the weld bead from the atmosphere (air) and suppressing oxidation of the weld bead.

(Second Usage Form)
As a second form of use, the aftershield jig 1 of this embodiment can be used by attaching a flat shield attachment 3 and an extended shield attachment 6 to an adapter 2, as shown in Figures 6 and 7, to perform welding on a flat workpiece S1.

Specifically, in this second mode of use, the extension shield attachment 6 is made of, for example, a non-ferrous metal such as an aluminum alloy or a magnesium alloy, a metal, or a heat-resistant and flame-retardant resin, and is detachably attached to the rear surface of the adapter body 7 (adapter 2) by means of screws or the like. In other words, this second mode of use is configured such that the extension shield attachment 6 is attached to the adapter 2 instead of the imaging attachment 5.

The bottom surface of the extension shield attachment 6 has a flat shape that corresponds to the planar shape of the workpiece S1 and covers the rear side in the weld line direction from the rear end side of the flat shield attachment 3. The bottom surface of the extension shield attachment 6 is also arranged so as to be continuous with the bottom surface of the flat shield attachment 3.

The extension shield attachment 6 is provided with an aftershield nozzle 15 that sprays aftershield gas. For this reason, the underside of the extension shield attachment 6 is provided with a hole 15a that forms the aftershield nozzle 15, a groove 15b that extends from the underside (lower end) of the tip of the hole 15a in the direction of the weld line, and a slit 15c that cuts out the underside of the groove 15b in the direction of the weld line. In addition, the slit 15c of the extension shield attachment 6 is provided so as to be continuous with the slit 3b of the flat shield attachment 3.

A diffusion member 11 that diffuses and sprays the aftershield gas is attached to the tip of the aftershield nozzle 15. That is, this diffusion member 11 is screwed into the inside of the hole 15a from the underside of the extension shield attachment 6.

In addition, a connection portion 15d is provided on the upper surface of the extension shield attachment 6 for introducing back shield gas into the hole portion 15a (after shield nozzle 15).

This allows the aftershield nozzle 15 to spray the aftershield gas from inside the extended shield attachment 6 along the planar shape of the workpiece S1.

The aftershield nozzles 9 and 15 are arranged in a row in the direction of the weld line, and are configured with independent holes 59a, 15a between adjacent ones. This allows the aftershield gas sprayed from each hole 9a, 15a (aftershield nozzles 9, 15) to be sprayed appropriately toward the workpiece S1 without interference.

The extension shield attachment 6 is provided with a cooling mechanism 16 that is cooled by the circulation of a cooling liquid. The cooling mechanism 16 has a liquid flow path (not shown) through which the cooling water is circulated, an inlet connection 16a that supplies the cooling water to the liquid flow path, and an outlet connection 16b that discharges the cooling water from the liquid flow path. The liquid flow path is located inside the extension shield attachment 6. The inlet and outlet connections 16a, 16b are located on the top surface of the extension shield attachment 6.

In the cooling mechanism 16, a cooling device (chiller) is connected to these connections 16a and 16b, and the cooling water is circulated in the liquid flow path, making it possible to cool the extension shield attachment 6.

When welding is performed on a flat workpiece S1 using the aftershield jig 1 of the second usage form having the above-described configuration, aftershield gas is released from the aftershield nozzles 9, 15 onto the weld bead formed immediately after welding the workpiece S1.

As a result, in the second usage mode, after-shield gas can be appropriately released to the weld bead formed immediately after welding the flat workpiece S1, isolating the weld bead from the atmosphere (air) and suppressing oxidation of the weld bead.

In addition, in the second usage mode, by using the extended shield attachment 6 described above, it is possible to expand the range (length) over which the after-shield gas is released toward the weld bead.

(Third Usage Form)
As a third usage form, the aftershield jig 1 of this embodiment can be used by attaching a curved shield attachment 4 and an imaging attachment 5 to an adapter 2, as shown in Figures 8, 9 and 10, to perform welding on a cylindrical workpiece S2.

Specifically, in this third mode of use, the curved shield attachment 4 is made of, for example, a non-ferrous metal such as an aluminum alloy or a magnesium alloy, or a metal, or a heat-resistant and flame-retardant resin, and is detachably attached to the underside of the adapter body 7 (adapter 2) by means of screws or the like. In other words, this third mode of use is configured such that the curved shield attachment 4 is attached to the adapter 2 instead of the flat shield attachment 3 described above.

The bottom surface of the curved shield attachment 4 is curved to correspond to the curved shape of the workpiece S2, covering the tip side of the torch nozzle 23 to the rear side in the weld line direction. The curved shield attachment 4 also has a groove 4a that is continuous with the groove 9b of the adapter body 7 (adapter 2), and a slit 4b that cuts out the bottom side of the groove 4a in the weld line direction.

The curved shield attachment 4 is also provided with a number of aftershield nozzles 17 that spray the aftershield gas. For this reason, the bottom surface of the curved shield attachment 4 is provided with a number of holes 17a that form each aftershield nozzle 17.

A diffusion member 11 that diffuses and sprays the aftershield gas is attached to the tip of each aftershield nozzle 17. That is, this diffusion member 11 is screwed into the inside of each hole 17a from the underside of the curved shield attachment 4.

In addition, the rear surface of the curved shield attachment 4 is provided with multiple connection parts 17b for introducing back shield gas into each hole 17a (after shield nozzle 17).

This allows each aftershield nozzle 17 to spray aftershield gas from inside the curved shield attachment 4 along the curved shape of the workpiece S2.

The multiple aftershield nozzles 17 are arranged in a line in the direction of the weld line, and each nozzle has an independent hole 17a between adjacent nozzles. This allows the aftershield gas sprayed from each hole 17a (aftershield nozzle 17) to be sprayed appropriately toward the workpiece S2 without interference.

A camera unit 12 that captures images of the state of the weld bead is attached to the imaging attachment 5 via an insulating tube 13. On the other hand, the camera unit 12 omits the spacer 12e, and is configured such that the connecting tube 12d and the insulating tube 13 are directly connected. In this case, it is preferable to provide a transparent cover (not shown) at one end of the insulating tube 13 to block the flow of air so that air does not flow from the camera unit 12 side through the insulating tube 13 to the imaging attachment 5 side.

When welding is performed on the cylindrical workpiece S2 shown in FIG. 8 using the aftershield jig 1 of the third usage form having the above-described configuration, aftershield gas is released from the aftershield nozzle 17 onto the weld bead formed immediately after welding the workpiece S2.

As a result, in the third usage mode, after-shield gas can be appropriately released to the weld bead formed immediately after welding the cylindrical workpiece S2, isolating the weld bead from the atmosphere (air) and suppressing oxidation of the weld bead.

As described above, when using the aftershield jig 1 of this embodiment to weld the workpieces S1 and S2 having different shapes as described above, it is possible to freely switch (replace) the shield attachments 3 and 4, which have different shapes that cover the tip side of the torch nozzle 23 to the rear side in the weld line direction, in accordance with the difference in the shapes of the workpieces S1 and S2.

This makes it possible to use the aftershield jig 1, which has a simple structure and is easy to align with the shapes of the workpieces S1 and S2, to appropriately release aftershield gas onto the workpieces S1 and S2, which have different shapes, and to suppress oxidation of the weld bead.

The present invention is not necessarily limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, with regard to the above-mentioned shielding attachments 3, 4, and 6, the shape and size (length and diameter) of each attachment 3, 4, and 6, as well as the number of after-shield nozzles 9, 15, and 17, can be appropriately changed to match the shape and size (length and diameter) of the workpieces S1 and S2.

The welding torch 21 is not limited to the non-consumable welding torch (TIG welding torch) described above, but may be a consumable welding torch such as a plasma arc welding torch that emits a plasma arc to the workpiece, or a MIG welding torch. The welding power supply 40 may also be one that matches the welding torch 21 used.

1...Aftershield jig 2...Adapter 3...Flat shield attachment 4...Curved shield attachment 5...Image capture attachment 6...Extended shield attachment 7...Adapter body 8...Insulating member 9...Aftershield nozzle 10...Cooling mechanism 11...Diffusion member 12...Camera unit 13...Insulating tube 14...Cooling mechanism 15...Aftershield nozzle 16...Cooling mechanism 17...Aftershield nozzle 20...Welding device 21...Welding torch 22...Non-consumable electrode 23...Torch nozzle 30...Wire feeder 31...Filler guide 40...Welding power supply 50...Aftershield gas supply device 60...Control device 100...Welding system S...Workpiece S1...Plate-shaped workpiece S2...Cylindrical workpiece

Claims (9)

An after-shield jig that discharges an after-shield gas from a torch nozzle of a welding torch that performs welding by generating an arc between a workpiece and the workpiece while discharging a shielding gas from the torch nozzle toward a rear of the torch nozzle in a weld line direction toward a weld bead that is formed immediately after welding the workpiece,
An adapter that is detachably attached to the torch nozzle;
two or more shield attachments detachably attached to the adapter;
one or more aftershield nozzles for injecting an aftershield gas from inside the shielding attachment;
The shield attachment has a different shape that covers the tip side of the torch nozzle and the rear side in the weld line direction in accordance with the shape of the workpiece,
The aftershield jig is characterized in that the adapter is provided with a cooling mechanism that is cooled by circulating a cooling liquid . The aftershield jig according to claim 1, characterized in that it includes a flat shield attachment that corresponds to the flat shape of the workpiece, and a curved shield attachment that corresponds to the curved shape of the workpiece. The aftershield jig according to claim 2, characterized in that it is provided with an extension shield attachment that can be detachably attached to the flat shield attachment or the curved shield attachment. The aftershield jig according to claim 1, characterized in that it is provided with an insulating member disposed between the torch nozzle and the adapter to electrically insulate the torch nozzle from the adapter. The aftershield jig described in claim 1, characterized in that the aftershield nozzles are arranged in a row in the direction of the weld line, and each adjacent nozzle is composed of an independent hole. The aftershield jig according to claim 1, characterized in that a diffusion member that diffuses and sprays the aftershield gas is attached to the tip of the aftershield nozzle. an imaging attachment that is detachably attached to the adapter;
2. The aftershield jig according to claim 1, wherein the imaging attachment is provided with a camera unit for imaging a state of the weld bead. The aftershield jig according to claim 1, characterized in that the shield attachment is provided with a cooling mechanism that is cooled by circulating a cooling liquid. A welding torch that performs welding by generating an arc between a workpiece and the torch nozzle while releasing a shielding gas from the torch nozzle;
an after-shield jig that emits an after-shield gas from the torch nozzle toward the rear in the weld line direction toward a weld bead formed immediately after welding of the workpiece,
A welding device using an aftershield jig according to any one of claims 1 to 8 as the aftershield jig.

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