JP2007030006A - Welding torch, welding equipment and welding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that fillet welding is difficult in a narrow part where a conventional constitution has or a junction where two members are in contact at an acute angle. <P>SOLUTION: In the welding torch providing a head part for supporting a welding electrode, a joining member joined to the head part and a torch casing joined to the joining member, the outline shape of the head part is made into a reverse trapezoidal shape, provided with a recess made backward and forward in the lower part in the rear of the joining member and in the lower part of the torch casing and a wire introducing pipe provided in the recess and for introducing a filler wire and the internal space of the torch casing is made into a shield gas supply passage inside the casing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a welding torch, a welding apparatus, and a welding method suitable for performing welding in a narrow portion.

Conventionally, as shown in FIG. 4, as a TIG welding torch that easily performs weaving welding on the inner surface of a narrow portion, the TIG welding torch has a shielding gas around the electrode rod 54 fixed to the torch body 50. It is proposed that an arc is generated between the electrode rod 54 and the base material to be welded and a cooling medium is circulated in the torch body 50 to perform welding while cooling the electrode rod 54 and its surroundings. ing.
In the above-described welding torch, the torch body 50 is formed in an elongated shape, and the cross-sectional shape of the thickest portion is formed in a substantially circular shape, while an electrode fixing portion is provided inside the torch body 50 and the electrode rod 54 is fixed to the electrode. The electrode rod 54 is fixed to the torch main body 50 by attaching a bolt that presses the electrode to the tip of the torch main body and sandwiching the electrode rod 54 with the electrode fixing portion and the bolt.
In addition, 53 is a gas nozzle, 52 is a torch body, 51 is a gas lens (for example, patent document 1).

JP 2000-24780 A

In the welding torch described above, for example, as shown in FIGS. 5 and 6, the distance between the upper plate member 55 and the lower plate member 56 is narrow, and the connecting member (or the upper plate member 55 and the lower plate member 56 is connected). When the aggregate 57 or the like is disposed obliquely, it is difficult to weld the fillet joint portion where the upper plate member 55 and the connecting member 57 are acute.
In addition, a shield gas suction hose (not shown) is provided at the upper portion, and there is a limit to downsizing, and it cannot be used when the distance between the upper plate material 55 and the lower plate material 56 is narrow.
Furthermore, in order to perform overlay welding or the like, it is necessary to add a filler wire, but in this case, the size is further increased.

  The present invention is intended to solve the problems of such a conventional configuration, and is a welding torch and welding apparatus capable of performing fillet welding of a narrow portion or a joint where two members are in contact with an acute angle. And it aims at realizing a welding method.

In order to solve the above problems, the present invention aims to solve the problems by the following means.
(1) A first means is a welding torch comprising a head portion supporting a welding electrode, a connecting member connected to the head portion, and a torch casing connected to the connecting member. It is characterized by an inverted trapezoidal shape.

  (2) The second means is a welding torch comprising a head portion for supporting an electrode for welding, a connecting member connected to the head portion, and a torch casing connected to the connecting member. A dent provided in the front-rear direction at a lower portion of the torch casing and a wire introduction tube provided in the dent for introducing a filler wire are provided.

(3) A third means is a welding torch comprising a head portion supporting a welding electrode, a connection member connected to the head portion, and a torch casing connected to the connection member. The shield gas supply passage in the casing is used.

(4) The welding torch of the fourth means, in the first means, introduces a recess provided in the front-rear direction at the rear lower part of the connecting member and the lower part of the torch casing, and a filler wire provided in the recess. And a wire introduction tube.

(5) The welding torch of the fifth means is characterized in that, in any one of the first, second or fourth means, the inner space of the torch casing is used as a shield gas supply passage in the casing.

(6) A sixth means is a welding torch comprising a head portion, a connecting member connected to the head portion, and a torch casing connected to the connecting member, wherein the outer shape provided on the head portion is an inverted trapezoidal shape. A gas nozzle, an electrode support that is provided in the gas nozzle with a gap between the inner surface of the gas nozzle and supports a welding electrode, and the inner space of the torch casing serves as a shield gas supply passage in the casing, and the casing is perforated in the connecting member. The shield gas supply path in the connecting member that communicates with the inner shield gas supply path, and the shield gas in the support that communicates between the gap between the gas nozzle and the electrode support and the shield gas supply path in the connection member that is formed in the rear part of the electrode support A supply passage, an electrode cooling passage formed in the gas nozzle, a torch casing, and a leading end that penetrates the connecting member. A cooling water supply pipe and a cooling water return pipe communicating with the electrode cooling passage in the electrode support, a recess provided in the front and rear direction of the lower rear part of the connecting member and the lower part of the torch casing, and a filler wire provided in the recess. And a cooling water supply pipe or a cooling water return pipe is formed of a conductive material.

(7) The welding torch of the seventh means is characterized in that, in any one of the first to sixth means, the head portion is formed within a range of 50 ° with the welding point as a vertex.

(8) The welding device of the eighth means includes the welding torch of the above means 6 or 7, the shield gas supply source connected to the shield gas supply passage in the casing, and the cooling water supply connected to the cooling water supply pipe. And a welding power source connected to at least one of the cooling water supply pipe and / or the cooling water return pipe.

(9) A welding method of the ninth means comprises a gas nozzle having an inverted trapezoidal outer shape and a shield gas injection hole in the lower part, and a gas nozzle provided with a gap between the inner surface of the gas nozzle and supporting a welding electrode. An electrode support, a connection member connected to the electrode support, a torch casing connected to the connection member, and an internal space of the torch casing as a shield gas supply passage in the casing, and a shield gas in the casing formed in the connection member. A shield gas supply path in the connecting member that communicates with the supply path; and a shield gas supply path in the support that communicates the gap between the gas nozzle and the electrode support and the shield gas supply path in the connection member that is formed in the rear portion of the electrode support. An electrode cooling passage formed in the gas nozzle, and an electrode that is provided in the torch casing and has a tip that penetrates the connecting member A cooling water supply pipe and a cooling water return pipe communicated with the electrode cooling passage in the port, and a wire introduction for introducing a filler wire provided in a recess provided in the front-rear direction at a lower rear portion of the connecting member and a lower portion of the torch casing A welding torch equipped with a pipe, and a shield gas is ejected through a shield gas supply path in the casing, a shield gas supply path in the connecting member, a shield gas supply path in the support and a shield gas ejection hole, and a cooling water supply pipe and a cooling water Cooling water is circulated in the return pipe to cool the electrode support and the electrode, and a filler wire is fed into the wire introduction pipe, and a welding power source is connected to at least one of the cooling water supply pipe and the cooling water return pipe. The overlay welding is performed by passing a welding current to the electrode through the electrode.

The invention of the welding torch, the welding apparatus, and the welding method according to each claim described in the claims employs each of the above-described means, and it is possible to weld a narrow portion that was difficult with the conventional welding torch. Become.
Moreover, since welding wire is also supplied, overlay welding is also possible.
This facilitates visual inspection and torch handling of the welded portion, and improves the welding workability in the narrow portion.

Hereinafter, each embodiment of the present invention will be described with reference to FIGS.
1 is a cross-sectional view of a welding torch according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line BB in FIG.

  As shown in FIG. 1, the welding torch according to the first embodiment of the invention includes a head portion composed of a gas nozzle 5 and the like, a connection member 6, and a torch casing 7 connected to a gripping portion (not shown). It is comprised by.

(Head configuration)
First, this head unit will be described.
As shown in FIG. 2, a cylindrical gas nozzle 5 whose outer cross section has an inverted trapezoidal shape is disposed in the head portion of the welding torch.
The front end side of the gas nozzle 5 is closed, and a shield gas ejection hole 25 is formed in the lower part.
The gas nozzle 5 is formed of an insulating material such as ceramic that can withstand high temperatures.
The gas nozzle 5 is not limited to ceramic but may be made of quartz or glass which is a heat-resistant transparent member. This facilitates visual confirmation of the welding target position during the welding operation.

As shown in FIG. 2, a conductive electrode support 2 having a reverse trapezoidal cross-sectional shape is built in the gas nozzle 5.
There is a gap between the upper surface in front of the electrode support 2 and the inner surface of the upper plate of the gas nozzle 5, and a shield gas header portion 24 is formed in this gap.
Furthermore, a gap is also formed between the side surface of the electrode support 2 and the inner surface of the side plate of the gas nozzle 5, and this gap flows from the shield gas header portion 24 toward the shield gas ejection hole 25, It is a passage for shield gas such as inert gas.
Further, as shown in FIG. 1, the rear portion of the electrode support 2 is slightly larger than the front end side, and is attached so as to be inscribed in the gas nozzle 5.

An electrode insertion hole for inserting the tungsten electrode 1 is formed in the center of the electrode support 2 in the left-right direction.
An electrode fixing bolt 3 penetrating the front plate of the gas nozzle 5 is attached to the tip of the electrode support 2, and the electrode 1 is fixed to the electrode support 2 by the electrode fixing bolt 3.
Reference numeral 4 denotes a hexagonal hole for tightening the electrode fixing bolt 3.
The electrode 1 protrudes from the center of the shield gas ejection hole 25 of the electrode support 2.

  In the vicinity of the upper center of the rear part of the electrode support 2, an in-support shield gas supply path 22 extending from the rear end in the front end direction is formed, and further, the in-support shield gas supply path 22 and the shield gas header part 24 are connected. An in-support shield gas supply path 23 in the vertical direction is formed.

  A U-shaped or U-shaped electrode cooling passage 14 having openings at the left and right of the rear end of the electrode support 2 is formed behind the electrode insertion hole of the electrode support 2.

As described above, the cross-sectional shapes of the electrode support 2 and the gas nozzle 5 are not circular but inverted trapezoidal shapes.
Thereby, while reducing the lateral width at the head portion of the welding torch, the cross-sectional area of the electrode support 2 is made as large as possible to ensure rigidity, energization, and cooling area.

Normally, the distance between the welding point W and the tip of the electrode 1 for welding an object by generating an arc between the electrode 1 and the welding point W is set to be about 6 mm.
The head portion, that is, both side surfaces of the gas nozzle 5 are formed to have a range of an opening angle of 50 ° or less around the welding point W, and the welding torch is inserted obliquely into the narrow portion. TIG overlay welding work can be performed.

(Configuration of connecting member)
As shown in FIG. 1, a connection member 6 is connected to the rear ends of the gas nozzle 5 and the electrode support 2.
The connection member 6 is formed of an insulating material such as ceramic, quartz, or glass that is a heat-resistant transparent member.
Further, the cross-sectional shape on the front side of the connecting member 6 is an inverted trapezoidal shape like the gas nozzle 5, and both side surfaces have a range of an opening angle of 50 ° or less with the welding point W as the center. It is formed to become.
On the other hand, the rear side of the connection member 6 has the same shape as a torch casing 7 described later.
In addition, in the lower rear part of the connecting member 6, a dent part for arranging a wire introduction pipe bending part 9 to be described later is formed.

Further, in the vicinity of the upper center of the connection member 6, a shield gas supply passage 21 in the connection member that communicates with the shield gas supply passage 22 in the support is formed in the front-rear direction.
Further, in the connecting member 6, two communication holes communicating with the entrance / exit of the electrode cooling passage 14 of the electrode support 2 are also formed.

(Configuration of torch casing)
As shown in FIG. 1, a torch casing 7 is connected to the rear part of the connection member 6.
As shown in FIG. 3, the torch casing 7 has a cylindrical cross section and is formed with a recess for arranging the wire introduction tube 8 at the bottom.
The material of the torch casing 7 is not particularly limited, but can be made of metal such as aluminum.
Further, the lower side of the torch casing 7 is processed into a concave shape, and a wire introduction tube 8 through which the filler wire 11 described later is passed is attached to the concave portion.
In this way, the lower side of the torch casing 7 is processed into a concave shape, and the wire introduction pipe 8 through which the filler wire 11 is passed is installed in the concave portion, thereby reducing the height and width of the torch casing 7. .

(Configuration of wire introduction pipe)
As shown in FIGS. 1 and 3, a wire introduction tube 8 is attached to a concave recess on the lower side of the torch casing 7.
Further, a wire introduction tube bending portion 9 connected to the wire introduction tube 8 is attached to the front portion of the concave recess portion on the lower side of the torch casing 7 and the recess portion in the lower rear portion of the connection member 6.
The bent portion 9 of the wire introduction tube is bent, and is formed so that the filler wire 11 fed out through the wire introduction tube 8 faces the welding point W.
Furthermore, a wire introduction tube guide portion 10 is attached to the tip of the wire introduction tube bending portion 9 so that the filler wire 11 is reliably fed out toward the welding point W.

The materials of the wire introduction tube 8, the wire introduction tube bending portion 9, and the wire introduction tube guide portion 10 are not particularly limited, but at least the wire introduction tube guide portion 10 should be a heat resistant member.
Note that a not-shown filler wire feeding device is provided behind the wire introducing tube 8, and the filler wire 11 wound around the filler wire feeding device includes the wire introducing tube 8 and the wire introducing device. It passes through the tube bending portion 9 and is fed out from the wire introduction tube guide portion 10 toward the welding point W.

(Configuration of shield gas supply line)
As shown in FIG. 1, the internal space of the torch casing 7 is a shield gas supply passage 20 in the casing, and a shield gas supply source (not shown) is connected to the rear part of the torch casing 7.
The shield gas supply path 20 in the casing communicates with the shield gas supply path 21 in the connection member formed in the connection member 6, and the shield gas supply path 21 in the connection member is a shield in the support at the rear of the electrode support 2. It communicates with the gas supply path 22.
Further, the in-support shield gas supply path 22 is connected to the upper surface in front of the electrode support 2 and the inner surface of the upper plate of the gas nozzle 5 via the in-support shield gas supply path 23 formed in the electrode support 2 in the vertical direction. It communicates with the gap between.

A gap between the front upper surface of the electrode support 2 and the inner surface of the upper plate of the gas nozzle 5 serves as a shield gas header portion 24.
The shield gas supplied to the shield gas header portion 24 includes a gap formed between the front end of the electrode support 2 illustrated in FIG. 1 and the front end of the gas nozzle 5, and the electrode support 2 illustrated in FIG. It passes through a gap formed between both side surfaces and both side surfaces of the gas nozzle 5, and is ejected toward the welding point W from the shield gas ejection holes 25 under the electrode support 2.

Thus, by using the internal space of the torch casing 7 as the shield gas supply path 20 in the casing, a dedicated shield gas pipe is omitted.
Further, by providing the shield gas header portion 24, the shield gas flows uniformly around the electrode support 2.
The shield gas flowing on the front surface and both side surfaces of the electrode support 2 also has a function of cooling the electrode support 2.
Furthermore, the electrode support 2 has an inverted trapezoidal shape so that the sprayed shield gas can easily concentrate on the welding point W.
The support shield gas supply path 22 extending in the distal direction and the support shield gas supply path 23 in the vertical direction may be a single support shield gas supply path extending obliquely upward.

(Configuration of cooling pipe and power supply)
As shown in FIGS. 1 and 3, a cooling water supply pipe 12 and a cooling water return pipe 13 are arranged on the left and right in the torch casing 7, and the cooling water supply pipe 12 and the cooling water return pipe 13 are illustrated. The substantial support material is supported so as not to contact the inner surface of the torch casing 7.
The cooling water supply pipe 12 and the cooling water return pipe 13 pass through two communication holes drilled in the connection member 6 and are connected to the entrance / exit of the electrode cooling passage 14 in the electrode support 2.

The other end of the cooling water supply pipe 12 is connected to a cooling water supply means such as a pump (not shown), and the other end of the cooling water return pipe 13 is connected to a drain tank or the like.
Further, at least one of the cooling water supply pipe 12 and the cooling water return pipe 13 is formed of a conductive material, and is connected to one pole (anode or cathode) of a welding power source (not shown).
The other pole of the welding power source is grounded.

The internal cross-sectional areas of the cooling water supply pipe 12 and the cooling water return pipe 13 are made large enough to secure the cooling water amount necessary for cooling the electrode support 2 and the electrode 1.
Thus, only the cooling water supply pipe 12 and the cooling water return pipe 13 that also serve as the power supply to the electrode 1 are arranged in the torch casing 7, and the torch casing 7, the cooling water supply pipe 12, and the cooling water return pipe 13 are arranged. The space in between is made into a shield gas supply passage 20 in the casing so as to be in a range of an opening angle of 50 ° or less with the welding point W as the center, and smaller than the lateral width of the gas nozzle 5 to the narrow portion. Is easy to insert.

  If the cooling water supply pipe 12 is connected to a welding power source and serves also as a welding current supply electric wire, and the cooling water return pipe 13 is formed of a heat insulating member, it is shielded by hot water flowing in the cooling water return pipe 13. Since the gas and the cooling water are hardly heated, the electrode support 2 and the electrode 1 can be cooled more effectively.

(Function)
The welding torch according to the first embodiment of the present invention is configured as described above. During welding, the shield gas is supplied from a shield gas supply source (not shown) to the shield gas in the casing in the torch casing 7. The shield gas header section 24 above the gas nozzle 5 passes through the path 20, the shield gas supply path 21 in the connection member in the connection member 6, the shield gas supply path 22 in the support in the electrode support 2, and the shield gas supply path 23 in the support. To be supplied.
The shield gas supplied to the shield gas header portion 24 is ejected from the shield gas ejection hole 25 toward the welding point W through the tip side and the left and right gaps between the electrode support 2 and the gas nozzle 5. .
At this time, the side surface of the gas nozzle 5 is inclined so as to have the welding point W as the apex, and the sprayed shielding gas acts so as to concentrate on the welding point W, so that the consumption of the shielding gas can be suppressed. it can.

  Further, the filler wire 11 is supplied from a wire feeding device (not shown), passes through the wire introduction tube 8 disposed in the lower portion of the torch casing 7, and passes through the wire introduction tube bending portion 9. The wire is bent toward the welding point W and fed out from the wire introduction tube guide 10.

The cooling water is supplied from a cooling water supply means such as a pump (not shown), passes through the torch casing 7, the connecting member 6, and the cooling water supply pipe 12 disposed in the electrode support 2, and the electrode support 2. The electrode support 2 and the electrode 1 are cooled by being supplied to the inner electrode cooling passage 14.
Thereafter, it passes through the cooling water return pipe 13 and is collected in a discharge tank (not shown).

  The welding current is supplied from a welding power source (not shown) to at least one of the cooling water supply pipe 12 and the cooling water return pipe 13, passes through the electrode support 2, and passes from the tip of the electrode 1 to the welding point W. It is discharged towards.

Therefore, it is possible to weld a narrow portion, which was difficult with a conventional welding torch.
Moreover, since the filler wire 11 is also supplied, overlay welding is also possible.
This facilitates visual inspection and torch handling of the welded portion, and improves the welding workability in the narrow portion.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications may be made to the specific structure within the scope of the present invention. Nor.
For example, the torch casing 7, the cooling water supply pipe 12, the cooling water return pipe 13, and the wire introduction pipe 8 are constituted by members such as a bellows that can be partially bent, and overlay welding of a curved narrow portion is performed. Anyway.

1 is a cross-sectional view of a welding torch according to a first embodiment of the present invention. It is AA arrow sectional drawing of FIG. It is BB arrow sectional drawing of FIG. It is front sectional drawing of the conventional TIG welding torch. It is a figure which shows the welding operation | work by the conventional TIG welding torch. It is a figure which shows the welding operation | work by the conventional TIG welding torch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrode 2 Electrode support 3 Electrode fixing bolt 4 Hexagonal hole 5 Gas nozzle 6 Connection member 7 Torch casing 8 Wire introduction pipe 9 Wire introduction pipe bending part 10 Wire introduction pipe guide part 11 Filling wire 12 Cooling water supply pipe 13 Cooling water return pipe 13 14 Electrode cooling passage 20 Shield gas supply passage in casing 21 Shield gas supply passage in connecting member 22, 23 Shield gas supply passage in support 24 Shield gas header portion 25 Shield gas ejection hole W Welding point

Claims (9)

  In a welding torch comprising a head portion supporting a welding electrode, a connecting member connected to the head portion, and a torch casing connected to the connecting member, the outer shape of the head portion is an inverted trapezoid. A welding torch characterized by.   In a welding torch comprising a head portion for supporting an electrode for welding, a connecting member connected to the head portion, and a torch casing connected to the connecting member, a rear lower portion of the connecting member and a lower portion of the torch casing A welding torch comprising: a recess provided in the front-rear direction; and a wire introduction tube provided in the recess for introducing a filler wire.   A welding torch comprising a head portion for supporting an electrode for welding, a connecting member connected to the head portion, and a torch casing connected to the connecting member, wherein an internal space of the torch casing is shielded in a casing gas A welding torch characterized by that.   2. A dent provided in a front-rear direction at a lower rear portion of the connection member and a lower portion of the torch casing, and a wire introduction pipe for introducing a filler wire provided in the dent. The welding torch as described.   The welding torch according to claim 1, wherein the inner space of the torch casing is used as a shield gas supply passage in the casing.   In a welding torch comprising a head part, a connecting member connected to the head part, and a torch casing connected to the connecting member, a gas nozzle having an inverted trapezoidal outer shape provided on the head part, and an inside of the gas nozzle The inner surface of the gas nozzle is provided with a gap and supports an electrode for welding, and the inner space of the torch casing serves as a shield gas supply passage in the casing, and is drilled in the connecting member and formed in the casing. A shield gas supply path in the connection member that communicates with the shield gas supply path, a support hole that is formed in a rear portion of the electrode support and communicates with a gap between the gas nozzle and the electrode support and the shield gas supply path in the connection member. Shield gas supply passage, electrode cooling passage formed in the gas nozzle, and provided in the torch casing And a cooling water supply pipe and a cooling water return pipe whose front end portion penetrates the connecting member and communicates with the electrode cooling passage in the electrode support, and a front and rear direction of the rear lower portion of the connecting member and a lower portion of the torch casing. And a wire introduction pipe for introducing a filler wire provided in the depression, and at least one of the cooling water supply pipe and the cooling water return pipe is formed of a conductive material. A welding torch characterized by.   The welding torch according to any one of claims 1 to 6, wherein the head portion is formed within a range of 50 ° having a welding point as a vertex.   The welding torch according to claim 6, a shield gas supply source connected to the shield gas supply path in the casing, a cooling water supply means connected to the cooling water supply pipe, and the cooling water supply pipe Or a welding power source connected to at least one of the cooling water return pipes.   A gas nozzle having an inverted trapezoidal outer shape and a shield gas injection hole at the bottom, an electrode support provided in the gas nozzle with a gap between the inner surface of the gas nozzle and supporting a welding electrode, and connected to the electrode support A connecting member, a torch casing connected to the connecting member, and an internal space of the torch casing as a shielding gas supply passage in the casing, and is formed in the connecting member and communicates with the shielding gas supply passage in the casing. A shield gas supply path in the connecting member, a shield gas supply path in the support that communicates the gap between the gas nozzle and the electrode support that is formed in the rear portion of the electrode support and the shield gas supply path in the connection member; The electrode cooling passage formed in the gas nozzle and the tip portion is provided in the torch casing and the front end portion A cooling water supply pipe and a cooling water return pipe that pass through the connecting member and communicated with the electrode cooling passage in the electrode support, and a recess provided in the front-rear direction at a lower rear portion of the connecting member and a lower portion of the torch casing. A welding torch provided with a wire introduction pipe for introducing a filler wire, the shield gas supply passage in the casing, the shield gas supply passage in the connection member, the shield gas supply passage in the support, and the shield gas ejection hole; Through which the shielding gas is ejected, the cooling water is circulated through the cooling water supply pipe and the cooling water return pipe, the electrode support and the electrode are cooled, the filler wire is fed into the wire introduction pipe, and the cooling water supply pipe Alternatively, a welding power source is connected to at least one of the cooling water return pipes and a welding current is allowed to flow to the electrodes via the electrode support. Welding method and performing overlay welding by.

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