JP2002001541A - Torch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torch for hot wire capable of smoothly feeding at TIG arc welding without making a spark at a contact conduction point of adding wire and without damaging a wire surface ruggedly. SOLUTION: This torch 1 for hot wire is composed of a copper pipe 13 which guides wire 3, a wire feeding member 8 which is fixed on the tip of the copper pipe 13 and has a guide hole for guiding the wire 3, a ceramic guide 9 which is mounted on the tip of the wire feeding member 8, current-carrying tips 10a and 10b which are arranged so as to nip the wire 3 passing through the guide hole of the wire feeding member 8 and energizes the wire 3, and plate springs 6a and 6b which press the current-carrying tips 10a and 10b on the wire 3. One end side of the current-carrying tips 10a and 10b is fit in a groove or a hole which is formed on an comes into member surface, and the other end sides thereof are arranged so as to contact with the wire 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot wire torch for supplying an additional wire by TIG welding and a gas metal arc welding torch for supplying a welding wire by gas metal arc (GMA) welding. More particularly, the present invention relates to a torch suitable for stably conducting current to a wire.

[0002]

2. Description of the Related Art A hot wire torch of a conventional hot wire TIG welding apparatus will be described with reference to FIG. FIG. 14 is a view showing the structure of a hot wire torch disclosed in Japanese Patent Application No. 10-84014 filed by the present inventors, and FIG. 15 is a side view thereof. The hot wire torch 7 includes a copper tube 13 for guiding the wire 3, a wire feeding member 8 fixed to the tip of the copper tube 13, a ceramic guide 9 attached to the tip of the wire feeding member 8, and a wire feeding member 8. Chip 10 for energizing wire 3 passing through
And a leaf spring 6 pressing the wire 3 against the wire 3. The leaf spring 6 and the ceramic guide 9 are connected to the wire feeding member 8.
Are fixed with screws 11 and 14. The diameter of the guide hole of the ceramic guide 9 is set to be 0.03 to 0.1 mm larger than the diameter of the wire 3 so as to minimize the play between the ceramic guide 9 and the wire 3. In the hot wire torch 7 having such a structure, during the hot wire TIG welding, the wire 3 passes through the copper tube 13, the torch power supply member 8, and the ceramic guide 9 to reach a base material (not shown). The wire current for energizing and heating the wire 3 is supplied from a wire heating power supply (not shown), and the copper tube 13, the torch power supply member 8,
It flows along the path of the conducting tip 10, the wire 3, and the base material. Immediately before the wire 3 enters the ceramic guide 9,
Is pressed against the wire 3 by the spring 6, so that contact current is always conducted there, and the wire 3 is moved between the contact point and the base material.
Is heated.

Next, a conventional example of a GMA welding torch using a welding wire as a consumable electrode will be described with reference to FIGS. FIG. 16 is a view showing the configuration of the tip of a conventional torch for GMA welding. FIG. 17 is a longitudinal sectional view of FIG.
FIG. 17 is a sectional view taken along line AA of FIG. 16. The torch tip circumference 15 of this GMA welding torch is the same as that described in Japanese Patent Application No. 10-84014. The GMA welding torch is composed of a shield nozzle (not shown) through which a shield gas flows, and a GMA welding torch tip circumference 15 installed therein. The GMA welding torch tip circumference 15 includes a torch tip member 16 connected via a screw 17 to a torch body (not shown) for feeding the welding wire 3f, and a screw 17 from the torch body.
A ceramic guide 21 embedded in the axis of the torch tip member 16 so as to guide the wire 3f sent through the guide hole of the axis, and one end supported by the side of the torch tip member 16 and the other end from the ceramic guide 21 The current-carrying tip 18 that contacts the wire 3f to be sent out, and the current-carrying tip 1
8 is pressed against the wire 3f.
And a leaf spring 19 screwed to the spring (23). The torch tip member 16 is a conductor that conducts an arc current from the torch main body, and also removes heat from the torch tip member 16 itself as well as the conducting tip 18 and the leaf spring 19 so as not to be overheated by the arc generated at the torch tip. It is also a heat conductor that transmits to the water-cooled torch body. The screw 17 has a wire guide hole 20 which is considerably thicker than the wire diameter at the center axis thereof. The ceramic guide 21 is a cylindrical body made of silicon nitride having excellent heat resistance and wear resistance and having an outer diameter of 5 mm, and has an equilateral triangular guide hole 2 having an inscribed circle having a diameter of 1.24 mm at its axis. The triangular hole is used, assuming that a φ1.2mm wire is fed, foreign substances such as copper plating debris can be easily removed from the large space at the corner of the triangular hole without clogging, and This is for restraining the wire so that the position variation of the wire sending point is reduced at the side of the triangular hole.

A U-shaped groove 22 is provided on the outer surface of the torch tip member 16 at the center in the longitudinal direction.
8 has a structure in which one end is inserted and hooked.

As shown in FIG. 17, one end of the leaf spring 19 is brought into close contact with the torch tip member 16 by a holding screw 23. The other end of the leaf spring 19 presses the energizing tip 18 so that the energizing tip 18 is pressed. Is pressed against the U-shaped groove 22 of the torch tip member 16 and the wire 3f coming out of the triangular guide hole 2 of the ceramic guide 21.

The wire 3f is introduced from a torch main body (not shown) through a wire guide hole 20 of a screw 17 into the torch tip member 16, and passes through a guide hole 2 of a ceramic guide 21 embedded in the axis of the torch tip member 16. After passing through, the feeder 25 of the current-carrying tip 18 pressed by the leaf spring 19 comes into contact with the welding portion while lightly coming out of the ceramic guide 21. In this case, the conductive tip 18 is arranged so as to lightly press the wire 3f as close as possible to the outlet of the ceramic guide 21, so that the wire 3f is not deformed and bent by the conductive tip 18.

The arc current is supplied from the torch main body to the screw 17.
The torch tip member 16 is supplied to the torch tip member 16, and enters the conduction tip 18 through the contact conduction portion 24 between the U-shaped groove 16 of the torch tip member 16 and the conduction tip 18 having one end fitted therein, The current flows through the wire 3f that is in contact with the power supply section 25 at the tip of the power supply tip 18 to the arc forming section between the tip of the wire 3f and the base material. The current-carrying tip 18 is lightly pressed against the wire 3f by the leaf spring 19 to conduct current. The current-carrying chip 18 is usually made of chromium copper.

[0008]

In the prior art hot wire torch as shown in FIG. 14, wire chips are generated when the additive wire is fed. That is, the inner surface of a conduit (not shown) that guides the addition wire 3 from the wire feeder (not shown) to the torch area 7, the contact between the inner surface of the torch and the wire surface, or the passage of the feed roller of the wire feeder. Occasionally it is scratched, and the copper plating (especially for mild steel wires, rust prevention, lubrication improvement in feeding, and treatment for improving contact electrical conductivity) is peeled off, or the wire is shaved to generate chips. Such chips, plating dust, and dust and rust attached to the wire are collectively referred to as foreign matter. It is interposed between the wires and prevents contact current to the wires. This instability of the contact current directly causes a spark between the wire and the current-carrying tip, creating irregularities on the wire surface or spatter fusing to the wire, and the wire passes through the thin ceramic guide chip hole. Occasionally, they clogged and rendered unusable. Also GMA
Since a large current flows in the current-carrying tip for welding, spatter was likely to be generated to increase the temperature of the current-carrying tip.

A first object of the present invention is to solve the above-mentioned problems and to prevent the occurrence of sparks at the current-carrying point of the additional wire even when the additional wire to which foreign matter adheres is fed. An object of the present invention is to provide a hot wire torch capable of supplying an additional wire while preventing damage to the surface.

[0010] A second object of the present invention is to enable continuous contact current supply of a welding wire without interruption.
An object of the present invention is to provide a torch for gas metal arc welding without arc breakage.

[0011]

In order to achieve the first object, a torch for a hot wire according to the present invention is a torch provided with a power supply member for guiding an additional wire during TIG arc welding and supplying electric current for contact. An insulating ceramic guide having a guide hole for guiding the addition wire fed from the power supply member, and a plurality of current-carrying tips having one end supported on the outer surface of the power supply member and the other end contacting the addition wire through an opening formed in the power supply member. And a plurality of springs for pressing the current-carrying tips against the addition wires, respectively, and the current-carrying tips are arranged so as to sandwich the addition wires.
The current-carrying tips may be arranged so as to be shifted from each other in the feeding direction of the additive wire.

With such a configuration, even if an instantaneous contact failure occurs between one energizing tip and the additional wire, the other energizing tip is energized to the additional wire at that time, thus causing an instantaneous poor contact. No large current flows through the chip and no spark is generated. As a result,
The additive wire can be fed smoothly without damaging the surface of the additive wire by sparks and without clogging in the ceramic guide.

In order to achieve the second object, a torch for gas metal arc welding according to the present invention is a torch provided with a power supply member for guiding a welding wire and supplying electric current to the welding wire. An insulating ceramic guide having a guide hole for guiding the addition wire, and a plurality of current-carrying tips, one end of which is supported on the outer surface of the power supply member and the other end of which contacts the welding wire fed from the ceramic guide, and each of which presses the current-carrying tip against the addition wire. A plurality of springs are provided, and the current-carrying tip is arranged so as to sandwich the welding wire. Then, the current-carrying tips may be arranged so as to be shifted from each other in the welding wire feeding direction.

With such a configuration, even if an instantaneous contact failure occurs between one of the current-carrying tips and the welding wire, the other current-carrying tip supplies electricity to the welding wire at that time. Spatter generated by restriking from the break can be prevented.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The torch of the present invention will be described below.
An embodiment thereof will be described with reference to the drawings. FIG. 1 is a configuration diagram of a torch for a hot wire according to a first embodiment of the present invention, and FIG. 2 is a side view of FIG. Hot Wire TIG (Tun
gsten Inert Gas) The arc welding method is a method of welding by adding an electrically heated hot wire to a molten pool formed in a base material by an arc generated between a tungsten electrode and a base material. The hot wire TIG welding device includes a TIG welding torch having a tungsten electrode and a hot wire torch for supplying a hot wire.

The hot wire torch 1 shown in FIG. 1 includes a copper tube 13 for guiding the addition wire 3, a wire feeding member 8 fixed to the tip of the copper tube 13 and having a guide hole for guiding the wire 3, and a wire feeding member. 8, a current guide tip 10a, 10b which is disposed so as to sandwich the wire 3 passing through the guide hole of the wire feeding member 8, and which feeds the wire 3;
Leaf springs 6a and 6b for pressing the respective wires 10b against the wires 3
It is composed of Each of the current-carrying chips 10a and 10b has one end fitted into a groove or a hole formed on the surface of the current-carrying member, and the other end arranged to be in contact with the wire 3, and with the groove or hole on one end serving as a fulcrum. The other end is held by the leaf springs 6a and 6b so as to swing in contact with the wire 3. The leaf springs 6a and 6b are fixed to the wire feeding member 8 with screws 11a and 11b, and the ceramic guide 9 is fixed to the wire feeding member 8 with screws 14.

In the hot wire torch, during the hot wire TIG welding, the additional wire 3 passes through the copper tube 13, the torch power supply member 8, and the ceramic guide 9, and reaches a base material (not shown). A wire current for heating the wire 3 is supplied from a wire heating power supply (not shown),
3, the torch power supply member 8, the current-carrying tips 10a and 10b, the wire 3, and the flow of the base material. Current-carrying chips 10a, 10b
Is pressed immediately before the ceramic guide 9 so as to sandwich the wire 3 between the springs 6a and 6b. FIG.
A sectional view showing a state where the current-carrying tips 10a and 10b are in contact with the wire 3 when new. The new current-carrying tip is located at a distance from each other across the wire and performs stable current-carrying, and heats the wire 3 between the point where each of the current-carrying tips 10a and 10b contacts the wire 3 and the base metal, thereby forming a hot wire. And On the other hand, FIG. 4 shows a state in which the wear of the current-carrying tips 10a and 10b becomes unusable due to progress. The worn current-carrying tips are dug by the wire 3 and come into contact with each other, so that the removal of foreign matters is not smooth and the current becomes unstable.

In this hot wire torch, the current supply path to the wire is of two systems, and even if a current supply chip cannot supply current to the wire, for example, a contact failure due to a foreign substance or the like occurs, the other tip does not. Since the current is supplied from the current-carrying tip, the contact current is reliably conducted, and no spark is generated between the current-carrying chip and the wire. For this reason, the wire is not clogged even with the fine ceramic guide hole. Also, the current flowing through each energizing chip is halved compared to the case of one energizing chip, and the resistance heating in each energizing chip is reduced to about 1/4, and the temperature rise of the energizing chip decreases. Wear life is prolonged. In particular, when a spark is generated with a stainless steel wire, small projections are formed on the surface of the wire, and clogging is likely to occur in the ceramic guide hole arranged on the wire sending side, but according to the torch of the present invention, a spark is generated. Because there is no, you can use a ceramic guide with a narrower hole,
Variations in the wire tip position due to the effect of the wire bending can be further reduced.

Embodiment 2 of the present invention will be described with reference to FIGS. FIG. 5 is a diagram showing a configuration around the tip of the torch of the hot wire torch according to the second embodiment of the present invention, and FIG. 6 is a side view of FIG. This hot wire torch is basically the same as Embodiment 1 in terms of components, namely, a copper tube 13, a wire feeding member 8, a ceramic guide 9, conducting chips 10a and 10b, and leaf springs 6a and 6b. , But the current-carrying tip 1 for the wire 3
The contact points 0a and 10b are shifted from each other by an interval "L" in the longitudinal direction of the wire.

FIGS. 7A and 7B are cross-sectional views taken along the line AA of FIG. 5, and FIG. 7A shows the state of contact with the wire 3 when the current-carrying tip 10b is new. FIG. 7B shows a current-carrying chip 10b.
This shows a state when the wear of the steel has progressed. FIG.
(A) and (b) are sectional views taken along the line BB in FIG. 5, and FIG. 8 (a) shows a contact state with the wire 3 when the current-carrying tip 8a is new. FIG. 8B shows a state in which the wear of the current-carrying tip 10a has progressed. Parts corresponding to those in FIG. 1 described above are indicated by the same numbers. The other configuration is the same as that of the first embodiment, and thus is omitted to avoid duplication. By arranging the current-carrying tips 10a, 10b alternately, even if the current-carrying tips 10a, 10b are worn by the wire 3, they do not collide with each other, so that the service life of the current-carrying tips 10a, 10b can be extended. it can.

A GMA welding torch according to a third embodiment of the present invention will be described with reference to FIGS.
FIG. 9 is a configuration diagram thereof, and FIG. 10 is a side view of FIG. This GMA welding torch is a modified version of the hot wire torch of the first embodiment for GMA welding, and is basically the same as the first embodiment except that the periphery thereof is covered with a shield gas nozzle (not shown). It is the same in terms of components. That is, the GMA welding torch is composed of the copper tube 13, the wire feeding member 8, the ceramic guide 9, the conducting tips 10a and 10b, and the leaf springs 6a and 6b. The configuration is such that the point contacts the wire 3 at the tip of the ceramic guide 9.

In this GMA welding torch, since the current-carrying tip is divided into two parts and the welding wire is energized, the arc break due to poor contact energization is eliminated, and the spatter caused by the re-ignition of the arc at that time is eliminated. Also, 1/2 for each energizing tip
Current flows and the heat generation of the chip due to electric resistance and contact resistance is suppressed to about 1/4, the temperature rise of the chip is reduced, and the adhesion of spatter is also reduced. Thus, the wear life of the current-carrying tip is prolonged.

The periphery of the torch tip of the torch for GMA welding according to the fourth embodiment of the present invention will be described with reference to FIGS. FIG. 11 is a configuration diagram thereof, and FIG. 12 is a side view of FIG. The GMA welding torch according to the fourth embodiment is a modification of the GMA welding torch according to the third embodiment, in which the contact points of the current-carrying tips 10a and 10b with respect to the wire 3 are shifted in the longitudinal direction of the wire. . Energizing tip 10a, 1
0b are displaced from each other, so that there is a problem that the effective extension (distance between the current-carrying chip contact point and the base material), which is the distance between the current-carrying chip contact point and the base material, is unstable. Even if the wear progresses, they do not collide with each other. Thus, the service life of the current-carrying chip can be extended.

The periphery of the torch tip of the torch for GMA welding according to the fifth embodiment of the present invention will be described with reference to FIG. This GM
A around the tip of the welding torch is the same type of copper tube 13, wire feeding member 8, energizing tips 10a and 10b and leaf springs 6a and 6b as in the third embodiment, and further energizing tips 10a and 10b.
And a copper cap 31 supporting the ceramic guide 30 and covering the periphery of the wire feed member 8, the conductive chips 10a and 10b, and the leaf springs 6a and 6b. It is composed of A shield nozzle 32 through which a shielding gas for welding flows is disposed around the cap 31. By providing the cap 31 in this manner, the current-carrying tips 10a and 10b and the leaf springs 6a and 6b can be protected from spatter and arc generated during welding and radiant heat from the molten pool, and their service life can be extended. .

Although each of the above embodiments has been described using two energizing chips, it goes without saying that the same effect can be obtained by using more energizing chips.

[0026]

According to the torch for a hot wire of the present invention, even when an additional wire to which foreign matter adheres is fed,
Sparks are not generated at the contact current-carrying point of the additive wire, preventing damage to the wire surface and smoothly supplying the additive wire without clogging with the ceramic guide.

Further, according to the torch for gas metal arc of the present invention, it is possible to eliminate arc breakage and reduce spatter.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a torch for a hot wire according to a first embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a cross-sectional view taken along line AA of FIG. 1, showing a current-carrying state of a new current-carrying chip;

FIG. 4 is a cross-sectional view taken along the line AA of FIG. 1 and is a diagram illustrating a current-carrying state of a worn current-carrying tip.

FIG. 5 is a configuration diagram of a torch for a hot wire according to a second embodiment of the present invention.

FIG. 6 is a side view of FIG. 5;

7A is a cross-sectional view taken along the line AA of FIG. 5, and FIG. 7A shows the energized state of a new energized tip, and FIG. 7B shows the energized state of a worn energized tip.

8A and 8B are cross-sectional views taken along the line BB of FIG. 5, wherein FIG. 8A shows the energized state of a new energized tip, and FIG. 8B shows the energized state of a worn energized tip.

FIG. 9 is a configuration diagram around a torch tip of a torch for GMA welding according to a third embodiment of the present invention.

FIG. 10 is a side view of FIG. 9;

FIG. 11 is a configuration diagram around a torch tip of a torch for GMA welding according to a fourth embodiment of the present invention.

FIG. 12 is a side view of FIG. 11;

FIG. 13 is a configuration diagram of a torch for GMA welding according to a fifth embodiment of the present invention.

FIG. 14 is a view showing a structure around a torch tip of a conventional hot wire torch.

FIG. 15 is a side view of FIG. 14;

FIG. 16 is a diagram showing a structure around a torch tip of a conventional GMA welding torch.

FIG. 17 is a side view of FIG. 16;

18 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot wire torch 3 Wire 4 GMA welding torch tip circumference 6a, 6b Leaf spring 8 Wire feeding member 9 Ceramic guide 10 Electricity tip 13 Copper tube 30 Ceramic guide 31 Cap 32 Gas shield nozzle

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiharu Nagashima 5-3 Takara-cho, Kure-shi, Hiroshima Fab term in Bab Hitachi Industrial Co., Ltd. (reference) 4E001 LD00 LH02 LH04 MC03

Claims (4)

[Claims] 1. A hot wire torch provided with a power supply member for guiding an additional wire during TIG arc welding and conducting electric current in contact therewith, comprising: an insulating ceramic guide having a guide hole for guiding the additional wire sent from the power supply member; A plurality of current-carrying tips, one end of which is supported on the outer surface of the power-supplying member, and the other end of which is in contact with the addition wire through an opening formed in the power-supplying member, and a plurality of springs each of which presses the current-carrying tip against the addition wire, A torch for a hot wire, wherein the energizing tip is arranged so as to sandwich the additive wire. 2. The torch for a hot wire according to claim 1, wherein the current-carrying tips are arranged so as to be shifted from each other in the feeding direction of the additive wire. 3. A torch for a gas metal arc welding having a power supply member for guiding a welding wire and conducting a contact current, comprising: an insulating ceramic guide having a guide hole for guiding an addition wire sent from the power supply member; A plurality of current-carrying tips, one end of which is supported by the outer surface of the power supply member and the other end of which contacts a welding wire sent out from the ceramic guide; and a plurality of springs each of which presses the current-carrying tip against an additional wire. A gas metal arc welding torch, wherein the torch is disposed so as to sandwich the welding wire. 4. The torch for gas metal arc welding according to claim 3, wherein the current-carrying tips are arranged so as to be shifted from each other in the welding wire feeding direction.