JPH09201678A - Welding torch - Google Patents

Abstract

(57) Abstract: A center gas supply pipe and the like can be prevented from being affected by radiant heat from an arc, and a welding electrode can be reliably supported concentrically with the inner nozzle axial center. The deposition and deposition of carbon can be avoided to maintain a uniform flow of the center gas, and it can be applied as an automatic welding machine. SOLUTION: A center gas supply passage 25 of a collet presser 5
Is connected to a center gas supply pipe 13 extending in the axial direction of the torch block body 3, the shield gas supply pipe 15 is provided in the shield gas flow passage 10 of the torch block body 3, and the cooling water supply pipe 17 is provided in the cooling water flow passage 11. The water discharge pipes 18 are connected so as to extend substantially parallel to the center gas supply pipes 13, respectively, and the collet 4 is provided with a center gas inflow passage 29, a communication hole 30, and a protrusion 32 in which a center gas communication portion is formed. An annular cutout 33 is formed on the inner peripheral edge of the tip of the inner nozzle 1.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a welding torch.

[0002]

2. Description of the Related Art Conventionally, as a welding torch applied to TIG automatic welding, there is, for example, one shown in FIG. 6, which has an inner nozzle 1 and an outer nozzle 2 at its tip.
The welding electrode 6 is arranged at the axial center of the torch block body 3 to which is attached via the collet 4 and the collet retainer 5.

At the axial center of the torch block body 3,
A collet insertion hole 7 is formed, a collet tightening taper 8 and a through hole 9 for the welding electrode 6 are formed in the lower portion of the collet insertion hole 7, and the collet insertion hole 7 and the through hole 9 of the torch block body 3 are formed. A shield gas flow passage 10 is formed on the outer peripheral side of the, and a cooling water flow passage 11 is formed above the shield gas flow passage 10, and helium (He) is formed on the side surface of the torch block body 3. And a center gas supply pipe 13 which is connected to the upper side of the collet insertion hole 7 and a shield gas 14 such as argon (Ar) which is supplied and communicates with the upper side of the shield gas flow passage 10. Shield gas supply pipe 15,
Cooling water supply pipe 17 to which cooling water 16 is supplied and communicates with the side of cooling water flow passage 11, and cooling water discharge pipe 1 for discharging cooling water 16 supplied to cooling water flow passage 11 to the outside.
8 and the outer peripheral portion of the torch block body 3 is covered with an insulating cover 19 such as Teflon, and the center gas supply pipe 13, the shield gas supply pipe 15, the cooling water supply pipe 17, and the cooling water discharge pipe. The insulating tape 18 is insulated by an insulating tape (not shown).

The inner nozzle 1 is concentrically attached to the tip of the torch block body 3 so as to communicate with the through hole 9 and surround the tip portion of the welding electrode 6, and the outer nozzle is attached to the torch block body 3. Two
Are attached concentrically so as to communicate with the shield gas flow passage 10 and surround the tip of the welding electrode 6 and the inner nozzle 1.

Further, a welding electrode insertion hole 20 is formed in the axial center portion of the collet 4, and a lower portion of the collet 4 is shown in FIG.
Further, as shown in FIG. 8, there are provided welding electrode fastening slits 21 extending in the longitudinal direction with a required interval in the circumferential direction.

The collet retainer 5 is airtightly screwed to the upper end of the axial center portion of the torch block body 3 by a seal member 22 such as an O-ring and pushes down the collet 4 downward.

Reference numeral 23 is a gas filter provided between the shield gas flow passage 10 of the torch block body 3 and the outer nozzle 2, and 24 is a sealing packing provided between the torch block body 3 and the outer nozzle 2. is there.

In the welding torch as described above, the collet 4 having the welding electrode 6 inserted into the welding electrode insertion hole 20 is inserted into the collet insertion hole 7, the collet 4 is pushed down by the collet retainer 5, and the lower end of the collet 4 is colleted. When pressed against the tightening taper 8, the welding electrode tightening slit 21 is narrowed by the wedge effect, and the lower portion of the collet 4 is narrowed down, whereby the welding electrode 6 is tightened and supported, and further, from the center gas supply pipe 13. The center gas 12 is supplied to the center gas flow passage 7a formed between the outer peripheral surface of the collet 4 and the inner peripheral surface of the collet insertion hole 7, and the inner nozzle 1 through the welding electrode tightening slit 21 and the through hole 9.
The shield gas 14 is jetted from the tip to the periphery of the welding electrode 6, the shield gas 14 is supplied to the shield gas flow passage 10 from the tip, is jetted from the tip of the outer nozzle 2 through the gas filter 23, and is further supplied to the cooling water feed pipe 17. The cooling water from the cooling water flow passage 11 to the outside through the cooling water discharge pipe 18 to cool the torch block body 3,
When a welding voltage is applied between the welding electrode 6 and the welding spot from a welding power source (not shown), an arc is generated between the welding electrode 6 and the welding spot, and the welding of the welding spot is performed. .

As a result, the center gas 12 ejected from the tip of the inner nozzle 1 to the periphery of the welding electrode 6 and the shield gas 14 ejected from the tip of the outer nozzle 2 shield the welding portion from the outside air and form the welding portion. Oxidation of the molten pool due to the outside air is prevented, and further, the center gas 12 ejected from the tip of the inner nozzle 1 to the periphery of the welding electrode 6 suppresses the spread of the arc and allows the arc to be concentrated at one point. A large welding amount can be obtained with a low welding current, and the welding speed can be improved.

[0010]

However, in the case of the conventional welding torch as described above, the center gas supply pipe 13, the shield gas supply pipe 15, and the cooling water supply pipe 17 are provided so as to project to the side surface of the torch block body 3. Cooling water discharge pipe 1
8 is connected, there is a problem that the supply pipes 13, 15, 17 and the cooling water discharge pipe 18 are heated by the radiant heat due to the arc generated during welding.

In the conventional welding torch as described above, the center gas flow passage 7a is formed between the collet 4 and the collet insertion hole 7 so that the collet 4 is apt to be displaced in the radial direction. Therefore, when the welding torch is assembled, when the collet retainer 5 is pressed against the collet 4 and pushed in with the collet 4 inclined, the welding electrode 6 is fixed while being eccentric to the axial center of the inner nozzle 1. When welding is performed in such a state, the arc is eccentric, and the center gas 12 does not sufficiently concentrate the arc on one point, so that a large amount of welding cannot be obtained, There was a fear that the speed could not be improved.

Furthermore, in the case of the conventional welding torch as described above, carbon is likely to adhere to and deposit on the inner peripheral surface of the tip of the inner nozzle 1, which may adversely affect the uniform flow of the center gas 12.

Therefore, the conventional welding torch as described above is still unsuitable for use as an automatic welding machine and has not been put into practical use at present.

In view of the above situation, the present invention has a center gas supply pipe 13, a shield gas supply pipe 15, and a cooling water supply pipe 1.
7 and the cooling water discharge pipe 18 can be prevented from being affected by radiant heat due to an arc generated during welding, and the welding electrode 6 can be reliably supported concentrically with the axial center of the inner nozzle 1.
It is possible to increase the amount of welding and the welding speed.
Moreover, it is an object of the present invention to provide a welding torch which can avoid the deposition and deposition of carbon on the inner peripheral surface of the tip of the inner nozzle 1 and can maintain a uniform flow of the center gas 12, and can be applied as an automatic welding machine.

[0015]

According to the present invention, a collet 4 into which a welding electrode 6 is inserted is inserted into a collet insertion hole 7 in the axial center portion of a torch block main body 3 and is pushed down by a collet retainer 5. By pressing the lower end against the collet tightening taper 8 below the collet insertion hole 7, the welding electrode tightening slit 21 below the collet 4 is narrowed so that the welding electrode 6 can be tightened and supported.
The center gas 12 supplied to the center gas flow passage 7a formed between the outer peripheral surface and the inner peripheral surface of the collet insertion hole 7 is passed through the through hole 9 of the torch block body 3 from the tip of the inner nozzle 1 at the tip of the torch block body 3. The torch block body 3 is made to be able to jet around the welding electrode 6.
The shield gas 14 which is supplied to the shield gas flow passage 10 formed on the outer peripheral side of the collet insertion hole 7 of the torch block body 3 can be ejected from the tip of the outer nozzle 2 at the tip of the torch block body 3, and the shield gas flow passage 10 of the torch block body 3 can be formed.
A welding torch capable of supplying and discharging the cooling water 16 to and from the cooling water flow passage 11 formed above, in which a center gas supply passage 25 is formed in the axial center portion of the collet retainer 5, and the torch is provided in the center gas supply passage 25. A center gas supply pipe 13 extending in the axial direction of the block body 3 is connected, a shield gas supply pipe 15 is connected to the shield gas flow passage 10 and a center gas supply pipe 11 is connected to the cooling water flow passage 11. A cooling water supply pipe 17 and a cooling water discharge pipe 18 extending substantially in parallel with the pipe 13 are connected to each other, and a center gas inflow passage 29 communicating with the center gas supply passage 25 is formed in the upper part of the inner peripheral surface of the collet 4, and the center gas A communication hole 30 that communicates the inflow path 29 and the center gas flow path 7a is formed so that the outer peripheral surface contacts the inner peripheral surface of the collet insertion hole 7 at a required position in the longitudinal direction of the collet 4. And those relating to the welding torch, characterized in that and providing the protrusion 32 Sentagasu communicating portion 31 is formed leading to the vertical direction.

In the welding torch, it is desirable to form an annular notch 33 at the inner peripheral edge of the tip of the inner nozzle 1.

According to the above means, the following effects can be obtained.

When the collet 4 into which the welding electrode 6 is inserted is inserted into the collet insertion hole 7, the collet 4 is pushed down by the collet retainer 5 and the lower end of the collet 4 is pressed against the collet tightening taper 8, the welding electrode is produced by the wedge effect. When the tightening slit 21 is narrowed and the lower part of the collet 4 is narrowed down, thereby tightening and supporting the welding electrode 6,
Since the outer peripheral surface of the protrusion 32 is in contact with the inner peripheral surface of the collet insertion hole 7, the collet 4 is prevented from being displaced in the radial direction thereof, and the welding electrode 6 is surely concentric with the axial center of the inner nozzle 1. Supported by.

Further, the center gas 12 supplied from the center gas supply pipe 13 flows from the center gas supply passage 25 of the collet retainer 5 into the center gas inflow passage 29 of the collet 4,
From the center gas inflow passage 29 through the communication hole 30, the protrusion 3
2 into the center gas flow passage 7a above the center gas communication passage 31 and from the center gas flow passage 7a below the protrusion 32 through the center gas communication portion 31 to the welding electrode tightening slit 21 and the through hole 9 from the tip of the inner nozzle 1 to the welding electrode 6. The shield gas 14 which is ejected to the surroundings and is supplied from the shield gas supply pipe 15 is supplied to the shield gas flow passage 10 and is ejected from the tip of the outer nozzle 2, and further the cooling water supply pipe 1
The cooling water supplied from 7 is guided to the cooling water flow passage 11, cools the torch block body 3, and is then discharged to the outside from the cooling water discharge pipe 18.

In this state, when a welding voltage is applied from the welding power source between the welding electrode 6 and the welding location, an arc is generated between the welding electrode 6 and the welding location concentrically with the axis of the inner nozzle 1, The center gas 12 ejected from the tip of the inner nozzle 1 to the periphery of the welding electrode 6 and the shield gas 14 ejected from the tip of the outer nozzle 2 shield the welding portion from the outside air, and the molten pool formed at the welding portion is oxidized by the outside air. The center gas 12 ejected from the tip of the inner nozzle 1 to the periphery of the welding electrode 6 surely suppresses the spread of the arc and concentrates the arc at one point, thereby obtaining a large welding amount with a relatively low welding current. In addition, the welding speed can be improved.

Moreover, in the case of the present invention, the center gas supply pipe 13, the shield gas supply pipe 15, the cooling water supply pipe 17, and the cooling water discharge pipe 18 are arranged in parallel with the axis of the torch block body 3. Since it is not connected to the side surface of the torch block main body 3 so as to project therefrom, the radiation heat from the arc generated during welding causes the supply pipes 13, 15, 1
7 and the cooling water discharge pipe 18 do not have to be heated.

Further, if an annular notch 33 is formed in the inner peripheral edge of the tip of the inner nozzle 1, when carbon adheres to the inner peripheral surface of the tip of the inner nozzle 1 and grows to a certain extent, the carbon is peeled off. It becomes difficult for carbon to be deposited on the inner peripheral surface of the tip of No. 1, and the uniform flow of the center gas 12 is hardly disturbed.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show an example of an embodiment for carrying out the present invention. In the drawings, the parts denoted by the same reference numerals as those in FIGS. 6 to 8 represent the same things, and the shaft of the collet retainer 5 is shown. A center gas supply passage 25 is formed in the core portion, and a center gas supply pipe 13 extending in the axial direction of the torch block body 3 is connected to the center gas supply passage 25 of the collet retainer 5 to form a shield gas flow passage of the torch block body 3. Reference numeral 10 denotes a shield gas supply pipe 1 extending substantially parallel to the center gas supply pipe 13.
5 is connected via a shield gas supply passage 26, and a cooling water supply pipe 17 and a cooling water discharge pipe 18 extending substantially parallel to the center gas supply pipe 13 are respectively cooled in the cooling water flow passage 11 of the torch block body 3. Water supply passage 27 and cooling water discharge passage 28
Connect via and.

Further, as shown in FIGS. 1 to 4, a center gas inflow passage 29 communicating with the center gas supply passage 25 is formed in the upper portion of the inner peripheral surface of the collet 4, and the center gas inflow passage 29 and the center gas flow passage 7a are formed. Communication hole 3 that communicates with
No. 0 is provided, and a protrusion 32 is formed at a required position in the longitudinal direction of the collet 4, the outer peripheral surface of which is in contact with the inner peripheral surface of the collet insertion hole 7 and a center gas communication portion 31 which communicates in the vertical direction is formed. In the figure, 4a is a taper portion formed at the lower end of the collet 4 so as to engage with the collet tightening taper 8 below the collet insertion hole 7 of the torch block body 3.

Further, on the inner peripheral edge of the tip of the inner nozzle 1,
As shown in FIG. 5, an annular cutout 33 is formed.

Next, the operation of the above illustrated example will be described.

The collet 4 having the welding electrode 6 inserted into the welding electrode insertion hole 20 is inserted into the collet insertion hole 7, and the collet 4 is pushed down by the collet retainer 5 so that the taper portion 4a at the lower end of the collet 4 is brought into contact with the torch block body 3 When pressed against the collet tightening taper 8 below the collet insertion hole 7,
The welding electrode tightening slit 21 is narrowed by the wedge effect, and the lower part of the collet 4 is narrowed down. As a result, when the welding electrode 6 is tightened and supported, the outer peripheral surface of the protrusion 32 becomes the inner peripheral surface of the collet insertion hole 7. Since they are in contact with each other, the collet 4 will not be displaced in the radial direction,
The welding electrode 6 is surely supported concentrically with the axis of the inner nozzle 1.

Further, the center gas 12 supplied from the center gas supply pipe 13 flows from the center gas supply passage 25 of the collet retainer 5 into the center gas inflow passage 29 of the collet 4,
From the center gas inflow passage 29 through the communication hole 30, the protrusion 3
2 into the center gas flow passage 7a above the center gas communication passage 31 and from the center gas flow passage 7a below the protrusion 32 through the center gas communication portion 31 to the welding electrode tightening slit 21 and the through hole 9 from the tip of the inner nozzle 1 to the welding electrode 6. The shield gas 14 which is jetted to the surroundings and is supplied from the shield gas supply pipe 15 is supplied to the shield gas flow passage 10 via the shield gas supply passage 26, is jetted from the tip of the outer nozzle 2 through the gas filter 23, Further, the cooling water supplied from the cooling water supply pipe 17 is guided to the cooling water flow passage 11 via the cooling water supply passage 27, and the torch block body 3
After cooling the cooling water, the cooling water discharge pipe 1 is passed through the cooling water discharge passage 28.
8 is discharged to the outside.

In this state, when a welding voltage is applied between the welding electrode 6 and the welding spot from a welding power source (not shown),
An arc is generated concentrically with the axis of the inner nozzle 1 between the welding electrode 6 and the welding location, and a center gas 12 is ejected from the tip of the inner nozzle 1 to the periphery of the welding electrode 6 and a shield gas is ejected from the tip of the outer nozzle 2. By 14,
The welded portion is shielded from the outside air, and while the molten pool formed at the welded portion is prevented from being oxidized by the outside air, the center gas 12 ejected from the tip of the inner nozzle 1 to the periphery of the welding electrode 6 surely suppresses the spread of the arc. As a result, the arc concentrates at one point, a large amount of deposition can be obtained with a relatively low welding current, and the welding speed can be improved.

Moreover, in the illustrated example, the center gas supply pipe 13, the shield gas supply pipe 15, the cooling water supply pipe 17, and the cooling water discharge pipe 18 are arranged parallel to the axis of the torch block body 3. Since the torch block body 3 is not connected to the side surface of the torch block body 3 by radiant heat due to an arc generated during welding, the supply pipes 13, 15,
There is no concern that 17 and the cooling water discharge pipe 18 will be heated.

Further, in the case of this illustrated example, since the annular notch 33 is formed in the inner peripheral edge of the tip of the inner nozzle 1 as shown in FIG. 5, carbon adheres to the inner peripheral surface of the tip of the inner nozzle 1. When the carbon is grown to a certain extent, the carbon is peeled off, so that the carbon is less likely to be deposited on the inner peripheral surface of the tip of the inner nozzle 1, and the uniform flow of the center gas 12 is less likely to be disturbed.

In this way, it is possible to prevent the center gas supply pipe 13, the shield gas supply pipe 15, the cooling water supply pipe 17 and the cooling water discharge pipe 18 from being affected by the radiant heat due to the arc generated during welding, and the welding electrode 6 is prevented. The inner nozzle 1 can be surely supported concentrically with the axial center of the inner nozzle 1, the amount of welding can be increased and the welding speed can be improved, and carbon deposition on the inner peripheral surface of the tip of the inner nozzle 1 can be avoided to prevent the center gas 12 from flowing. It can maintain a uniform flow and can also be applied as an automatic welder.

The welding torch of the present invention is not limited to the above-mentioned illustrated examples, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

[0035]

As described above, the first aspect of the present invention is as described above.
According to the welding torch described above, it is possible to prevent the center gas supply pipe 13, the shield gas supply pipe 15, the cooling water supply pipe 17, and the cooling water discharge pipe 18 from being affected by radiant heat due to an arc generated during welding, and welding The electrode 6 can be reliably supported concentrically with the axial center of the inner nozzle 1, and the excellent effect that the amount of welding and the welding speed can be improved can be achieved, and the welding according to claim 2 of the present invention. According to the torch, in addition to the above-described effects, it is possible to avoid the deposition and deposition of carbon on the inner peripheral surface of the tip of the inner nozzle 1 to maintain a uniform flow of the center gas 12, and to be applied as an automatic welding machine. Can play.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of one example of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a collet according to an example of an embodiment of the present invention.

FIG. 3 is a view taken along the line III-III in FIG.

4 is a view taken in the direction of arrows IV-IV in FIG. 2;

FIG. 5 is an enlarged cross-sectional view of a tip portion of an inner nozzle in an example of an embodiment of the present invention.

FIG. 6 is a sectional view of a conventional example.

FIG. 7 is an enlarged cross-sectional view of a collet in a conventional example.

FIG. 8 is a view on arrow VIII-VIII in FIG. 7.

[Explanation of symbols]

 1 Inner Nozzle 2 Outer Nozzle 3 Torch Block Body 4 Collet 5 Collet Presser 6 Welding Electrode 7 Collet Insertion Hole 7a Center Gas Flow Passage 8 Collet Tightening Taper 9 Through Hole 10 Shield Gas Flow Passage 11 Cooling Water Flow Passage 12 Center Gas 13 Center Gas Supply Pipe 14 Shield Gas 15 Shield gas supply pipe 16 Cooling water 17 Cooling water supply pipe 18 Cooling water discharge pipe 21 Welding electrode tightening slit 25 Center gas supply passage 29 Center gas inflow passage 30 Communication hole 31 Center gas communication portion 32 Projection portion 33 Annular cutout portion

Claims (2)

[Claims] 1. A collet (4) into which a welding electrode (6) is inserted is inserted into a collet insertion hole (7) at the axial center of the torch block body (3), and is pushed down by a collet retainer (5). By pressing the lower end of the collet (4) against the collet tightening taper (8) below the collet insertion hole (7), the welding electrode tightening slit (2) below the collet (4) is pressed.
1) is narrowed so that the welding electrode (6) can be clamped and supported, and a center gas flow passage (7) formed between the outer peripheral surface of the collet (4) and the inner peripheral surface of the collet insertion hole (7).
The center gas (12) supplied to a) is passed from the tip of the inner nozzle (1) at the tip of the torch block body (3) to the periphery of the welding electrode (6) through the through hole (9) of the torch block body (3). The shield gas (14) is supplied to the shield gas flow passage (10) formed on the outer peripheral side of the collet insertion hole (7) of the torch block body (3) while allowing the gas to be ejected. The outer nozzle (2) at the tip can be jetted from the tip, and the cooling water (16) can be supplied to and discharged from the cooling water flow passage (11) formed above the shield gas flow passage (10) of the torch block body (3). And a center gas supply passage (2) at the center of the collet retainer (5).
5) is formed, a center gas supply pipe (13) extending in the axial direction of the torch block body (3) is connected to the center gas supply passage (25), and a shield gas flow passage (10) is provided.
A shield gas supply pipe (15) extending substantially parallel to the center gas supply pipe (13) is connected to the cooling water flow passage (11).
A cooling water supply pipe (17) extending substantially parallel to the center gas supply pipe (13) and a cooling water discharge pipe (18) are connected to each other, and the center gas supply passage (25) is communicated with the upper part of the inner peripheral surface of the collet (4). Forming a center gas inflow path (29) for
The center gas inflow path (29) and the center gas flow path (7
A communication hole (30) for communicating with a) is bored, and a center gas communication in which the outer peripheral surface is in contact with the inner peripheral surface of the collet insertion hole (7) and communicates in the vertical direction at a required position in the longitudinal direction of the collet (4). A welding torch provided with a protrusion (32) having a portion (31) formed therein. 2. The welding torch according to claim 1, wherein an annular notch (33) is formed on the inner peripheral edge of the tip of the inner nozzle (1).