JPS6321591B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding torch used in so-called hot wire type non-consumable electrode arc welding, in which a wire is heated by the resistance component of the wire and a current supplied to the wire and then fed to the welding part. It is something.

Conventionally, as shown in Japanese Patent Publication No. 19731/1973, a method has been disclosed for welding metal to the surface of a base material by continuous "arcless" short circuit between the base material and a wire. That is, it has been shown that by heating the wire to near its melting point using a power feeding chip, the amount of welding can be significantly increased compared to the case where the wire is fed to the welding area without being heated.

A welding torch used in such hot wire non-consumable electrode arc welding is shown in FIG. This welding torch has two independent arc generation torches and wire heating torches.
There was a problem that a book torch was required and the area around the torch became large.

In Figure 1, 1 is an arc welding torch (hereinafter referred to as
A non-consumable electrode 2 made of tungsten is held approximately at the central axis at the tip of the torch, and a TIG arc 4 is generated between the electrode 2 and the base material 3, and the arc heat generates a A molten pool 5 is formed on the material 3. A wire heating torch 6 is arranged at an angle with respect to the TIG torch 1, and a heated wire 7 is fed from its tip toward the welding part. As shown in FIG. 1, the wire 7 is fed from the rear in the direction of welding progress, and comes into contact with the molten pool 5 in an "arc-free" state.

In non-consumable electrode arc welding, the position of the tip of the wire supplied from the wire heating torch is generally controlled by welding conditions such as welding current, welding speed, and wire feed speed relative to the position of the electrode held by the TIG torch. It is known that some fine-tuning is necessary. In the figure, 8 to 12 constitute a mechanism for finely adjusting the wire heating torch in the vertical direction.
By rotating the threaded rod 8, the slide piece 9
is guided by the guide rod 10 and moves up and down. A slide base 11 supports the threaded rod 8 and the guide rod 10. 12 is a screw for fixing the guide rod 10 to the slide base 11. Reference numeral 13 indicates a horizontal fine adjustment mechanism having the same configuration as the vertical fine adjustment mechanism. 14 is fixed to the TIG torch 1 with a holder. A slide base 11 for a vertical fine adjustment mechanism is fixed to the holder 14, and a slide base (not shown) for a horizontal fine adjustment mechanism is fixed to the slide piece 9. Further, 15 is a holder that supports the wire heating torch 6, and this is fixed to a slide (not shown) of a left-right direction fine adjustment mechanism.

Therefore, by rotating the threaded rod 8 of the vertical fine adjustment mechanism, the tip of the wire 7 moves vertically with respect to the electrode 2, and the threaded rod 13a of the horizontal fine adjustment mechanism moves.
By rotating , you can similarly move left and right.

The conventional hot wire type arc welding torch is constructed as described above, and the entire wire heating torch 6 is attached at an angle with respect to the TIG torch 1, resulting in a problem that the area around the torch becomes large. In addition, when finely adjusting the position of the tip of the wire according to welding conditions, it is necessary to rotate both the threaded rod 8 of the vertical fine adjustment mechanism and the screw rod 13a of the horizontal fine adjustment mechanism, and the adjustment becomes extremely difficult. The drawback was that it became complicated.

The present invention has been made in view of the above points, and an object of the present invention is to provide a hot wire type arc welding torch which allows easy adjustment of the position of the tip of the wire and is miniaturized.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows an embodiment of the present invention, FIG. 2 a is a front view, and FIG. 2 b is a partial sectional view. In the figure, 1 is a TIG torch, and 2 is a non-consumable electrode made of tungsten. . 20 is a holder;
It has the role of fixing and supporting the wire heating section to the TIG torch 1. Slit 20 in holder 20
A, a screw hole 20b, and a blank hole 20c are provided, and the slit 20a is tightened and fixed with a screw 21. A slide base 22 is fixed to the holder 20 by welding or the like. 23 is a slide piece disposed in the slide base 22 so as to be movable up and down, and a screw portion 23a is provided at the top of the slide piece.
is provided. Reference numeral 24 denotes an adjustment nut, which is screwed into the threaded portion 23a of the slide piece 23. A detent 22a is provided on the slide base 22 and engages with a guide groove 23b of the slide piece 23. Slide base 22 and slide piece 23
A coil spring 25 is fitted into the gap between the two. 26 is a guide holder, and slide piece 2
It is connected to a stepped portion 23c provided at the bottom of 3. A groove 26a is cut in the guide holder 26, and a screw 23d is cut in the slide piece 23, and the guide holder 26 is locked to the slide piece 23 by abutting the set screw 27 to the groove 26a.
A screw 26b is cut at the lower end of the guide holder 26 so that its extension line faces the electrode 2, and a guide cover 28 is screwed onto this screw 26b. A wire guide 29 made of a heat-resistant insulator is inserted into the guide cover 28 . Further, an insulating member 30 is inserted inside the slide piece 23 and the guide holder 26 as well.

31 is a conduit cable, the other end of which is connected to a wire feeding device (not shown).
32 is a stopper, and conduit cable 3
1 and inserted into the power supply fitting 33. A screw 33a is cut in the power supply fitting 33, and a set screw 34 connects the conduit cable 3.
1 is fixed to the power supply fitting 33. 35 is a copper wire through which wire heating current is applied, one end of which is connected to the power supply fitting 3.
3, and the other end is connected to a wire heating power source (not shown). Reference numeral 36 denotes a power supply chip, which is screwed into a screw 33b cut into the power supply fitting 33 with an insulating cap 37 interposed therebetween. As shown in the figure, by bringing the stepped portion 37a of the insulating cap 37 into contact with the stepped portion 36a of the power feeding chip 36, and screwing the insulating cap 37 into the threaded portion 23a of the slide piece 23, the power feeding portion can be slightly tightened. Attached to the adjustment mechanism. At this time, the insulating member 3
Since the length L ₂ of the stepped portion of the power supply chip 36 is longer than the depth L ₁ of the stepped portion of the slide piece 2
Electrical insulation of the metal members from 3 to the guide cover 28 is maintained. An insulating cover 38 covers the power supply fitting 33, the conduit cable 31, and the copper wire 35, and is electrically insulated from the outside.

The copper wire 35 and the power supply fitting 33 constitute a current-carrying section for supplying a wire heating current to the power supply chip 36, and this current-carrying section and the slide piece 23 are insulated via an insulating cap 37.

Further, a power feeding mechanism is constituted by the power feeding chip 36, the current-carrying section, the insulating member 30, which is an insulator, and the wire guide 29.

Next, the operation of the embodiment apparatus shown in FIG. 2 will be explained. First, the wire 7 fed from a wire feeding device (not shown) is connected to the conduit cable 3.
1. The power is sent to the vicinity of the electrode 2 through the power supply chip 36, the insulating member 30, and the wire guide 29. on the other hand,
Electricity is supplied to the wire 7 from a wire heating power source (not shown) through a copper wire 35, a power supply fitting 33, and a power supply chip 3.
6 at the lower end 36b of the power supply chip. After this, the wire 7 is connected to the insulating member 3
0. Since the wire 7 is electrically insulated by the wire guide 29, the wire 7 is heated from the power feeding point 36b by the electrical resistance of the wire between the base materials (hereinafter referred to as heating distance). Note that in order to increase the amount of heat generated in the wire 7 by increasing the current, it is necessary to configure the power supply portion to be large, so this is not preferable as a welding torch for manual welding. Therefore, in order to keep the current value for heating the wire 7 within a practical range, it is necessary to appropriately select the heating distance. Experimentally, when using heating current below 150A,
Suitable welding conditions were obtained by selecting a heating distance of 60 to 70 mm. Therefore, the portion of the guide holder 26 and the guide cover 28 after the power feeding point needs to be electrically insulated by the insulating member 30 and the insulating guide 29 while guiding the wire 7 to the arc portion, as in this embodiment. .

Next, fine adjustment of the position of the wire 7 with respect to the electrode 2 will be explained. Fine adjustment in the vertical direction is performed using the adjustment nut 24. Since the upper end of the coil spring 25 is in contact with the slide base 22 and the lower end is in contact with the slide piece 23, the slide piece 23 is always given a force to move downward. However, the adjustment nut 2 screwed onto the upper screw 23a of the slide piece 23
4 comes into contact with the upper part of the slide base 22,
The position of the slide piece 23 is determined by the position of the adjustment nut 24. That is, when the adjustment nut 24 is rotated to the left, the coil spring 25 is expanded and the slide piece 23 is moved downward, and when the adjustment nut 24 is rotated to the right, the coil spring 25 is compressed and the slide piece 23 is moved downward.
moves upward. At this time, since the detent 22a is engaged with the guide groove 26a, the slide piece 23 does not rotate even if the adjustment nut 24 is rotated.
Only moves up and down.

Next, the adjustment in the left and right direction is performed by rotating the guide holder 26. When the set screw 27 is slightly loosened, the guide holder 26 can freely rotate using the stepped portion 23c of the slide piece 23 as a bearing. Therefore, the guide holder 28 and the wire guide 2
Since the wire 9 is attached obliquely to the central axis of the guide holder 26, the tip of the wire 7 draws an arc with respect to the rotation of the guide holder 26. Therefore, in the vicinity of the tungsten electrode 2, it moves approximately linearly in the left and right direction. After adjusting the movement in this way, the set screw 27 is firmly locked and fixed at an appropriate position.

In the above embodiment, a TIG torch is used as the non-consumable electrode type torch, but other consumable electrode type torches such as a plasma torch may be used.

In addition, although the above embodiment specifically describes the case where it is applied to manual welding, it goes without saying that the advantages of a smaller torch can also be demonstrated in automatic welding, such as making it possible to apply it to narrow spaces. Not even.

Further, although a coil spring is used in the vertical fine adjustment mechanism, instead of the coil spring, the adjustment nut may be sandwiched between another member and the slide base to stop the adjustment nut from moving.

The conditions for a hot wire arc welding torch that can be used for manual welding are: (a) it must be small, (b) it must have a mechanism for finely adjusting the wire position, and (c) it must have no exposed parts such as the fine adjustment mechanism. (d) the heating distance is sufficient; and (e) the configuration allows for easy replacement of consumable parts such as power supply chips.

The device of the present invention includes a slide base fixed to the holder, a slide piece held in the slide base and movable up and down, and a slide piece provided at the upper end of the slide base and screwed to the slide piece. An adjustment nut that raises and lowers the piece,
Fine adjustment of the wire tip position is achieved by a guide holder rotatably attached to the lower part of the slide piece and lockable with a set screw, and a guide cover attached to the lower end of the guide holder and tilted toward the non-consumable electrode. a power supply chip that constitutes a mechanism and whose upper part engages with an insulating cap that is removably screwed onto the upper part of the slide piece, is inserted into the slide piece via an insulator, and feeds power to a wire passing through the inside; The slide piece is insulated via the insulating cap, and includes a current-carrying part that supplies a wire heating current to the power supply chip, the slide piece,
Inserted into the guide holder and guide cover,
Since the device is configured to be provided with a power feeding mechanism consisting of an insulator for ensuring a predetermined heating distance from the power feeding point at the lower end of the power feeding chip and insulating the wire passing inside, the device can be made smaller. In addition, the position of the wire tip can be easily finely adjusted both vertically and horizontally, and consumable parts such as the power supply chip can be easily replaced by removing and disassembling the insulating cap, improving operability. Can be done.

Furthermore, since the heating distance of the wire is set to a predetermined distance, the wire can be appropriately heated and good welding can be performed, and the power supply part can also be made compact, making manual welding easy.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional hot wire type arc welding torch, Fig. 2 shows a hot wire type arc welding torch according to an embodiment of the present invention, Fig. 2a is a plan view, and Fig. 2b is a plan view. FIG. 1... Arc welding torch, 2... Non-consumable electrode,
7... Wire, 20... Holder, 22... Slide base, 23... Slide piece, 24... Adjustment nut, 26... Guide holder, 27... Set screw, 28... Guide cover, 36... Power supply chip , 36b... feeding point, 37... insulation cap. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An arc welding torch provided with a wire tip position fine adjustment mechanism via a holder so that the central axis through which the wire passes is substantially parallel to the non-consumable electrode, which is fixed to the holder. a slide base; a slide piece held within the slide base and movable up and down; an adjustment nut provided at the upper end of the slide base and screwed onto the slide piece to raise and lower the slide piece; Rotatably mounted at the bottom,
The wire tip position fine adjustment mechanism is composed of a guide holder that can be locked with a set screw, and a guide cover that is attached to the lower end of this guide holder and tilted toward the non-consumable electrode. An insulating cap that is removably screwed together, a power supply chip whose upper portion abuts the insulating cap, is inserted into the slide piece through an insulator, and supplies power to a wire passing inside the slide piece; What is the slide piece? a current-carrying part that is insulated through the insulating cap and passes a wire heating current to the power supply chip; and a current-carrying part that is inserted into the slide piece, the guide holder, and the guide cover and extends a predetermined heating distance from the power supply point at the lower end of the power supply chip; A hot wire type arc welding torch characterized by being provided with an insulator for securing and insulating a wire passing inside.