JP2023064655A - contact tip for welding - Google Patents

Abstract

To provide a contact tip for welding which enables reduction of running cost and manufacturing cost.SOLUTION: An adapter 1 has an insertion hole 16 into which a welding wire 6 may be inserted. A rear end part of a tip body 3 is detachably connected to the adapter 1. The tip body 3 has a housing part 33 communicating with the insertion hole 16 therein. In the tip body 3, a tip part has a penetrating tip hole 35 which communicates with the housing part 33 and into which the welding wire 6 may be inserted. An abrasion resistant member 4 is disposed contacting with the tip part at the housing part 33. The abrasion resistant member 4 has abrasion resistance higher than that of the tip body 3. The abrasion resistant member 4 has a through hole 41 which communicates with the tip hole 35 and into which the welding wire 6 may be inserted. A wire guide 5 has conductivity and is disposed at the housing part 33 so as to sandwich the abrasion resistant member 4 with the tip part and hold the abrasion resistant member 4. The wire guide 5 has a guide hole 51 which communicates with the insertion hole 16 and the through hole 41 and into which the welding wire 6 may be inserted while contacting therewith.SELECTED DRAWING: Figure 1

Description

The present invention relates to a contact tip for welding.

In general, the tip of a contact tip for welding is exposed to a high temperature of about 500 to 600°C during welding, so the tip is easily damaged. Aim deviation will occur. Therefore, the life of the welding contact tip is usually determined by the degree of wear of the wire through-hole. If the life of the contact tip for welding is short, the frequency of replacement is large and workability is poor. In addition, the replacement cost increases, which becomes a heavy burden in terms of production costs.

In order to extend the life of welding contact tips, it is possible to use a material that is harder than the commonly used chromium copper. The price is several times higher than that of chromium copper.

As a conventional contact tip for welding, there is disclosed one in which a wear-resistant member is provided inside a tip body, and a welding wire passes through an inner passage of the wear-resistant member (see, for example, Patent Document 1).
The chip body has an insertion hole in a side portion thereof, and a hard member inserted into the insertion hole. The hard member is made of a conductive material harder than the chip body and extends in the length direction of the chip body. The inventor of the present invention has developed a contact tip for welding in which a wire through-hole that penetrates the tip body and a hard member is formed (see, for example, Patent Document 2).

Japanese Patent Publication No. 58-501986 Japanese Patent Application Laid-Open No. 2001-121268

However, although the welding contact tip described in Patent Documents 1 and 2 has a longer product life, it has the problem of increased running costs because the entire tip must be replaced at the time of replacement. Moreover, the contact tip for welding described in Patent Documents 1 and 2 uses a hard member made of an electrically conductive material, so there is a problem that the material of the hard member is limited and the manufacturing cost increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a welding contact tip capable of reducing running costs and manufacturing costs.

In order to achieve the above object, a welding contact tip according to the present invention comprises an adapter having an insertion hole through which a welding wire can be inserted, and an electrically conductive rear end detachable from the adapter. a tip body connected to the tip body and having a housing portion communicating with the insertion hole therein, and having a tip end hole at a tip portion thereof communicating with the housing portion and through which the welding wire can be inserted; A wear-resistant member having a high resistance and having a through hole which is arranged in the accommodating portion in contact with the tip portion and communicates with the tip hole and through which the welding wire can be inserted, and the tip portion having electrical conductivity. The guide hole is disposed in the storage portion so as to sandwich and hold the wear resistant member, and has a guide hole that communicates with the insertion hole and the through hole and allows the welding wire to be inserted in contact with the tip body. and a wire guide fixed to the body.

In the welding contact tip according to the present invention, since the wear-resistant member is arranged in the accommodating portion in contact with the tip portion of the tip body, wear due to the welding wire can be suppressed and the product life can be extended. The wire guide holds the wear-resistant member between itself and the tip of the tip body. The wire guide allows the welding wire to pass through the guide hole in contact with the welding wire, thereby powering the welding wire. The wear-resistant member has high durability and can suppress diameter expansion to prevent displacement of the welding position. Since the tip body can be attached to and detached from the adapter, running costs can be reduced by replacing only the tip body. In addition, since the wear-resistant member may be made of an insulator such as ceramic, it is possible to reduce manufacturing costs by using inexpensive materials.

In the welding contact tip according to the present invention, the insertion hole, the accommodating portion, the guide hole, the through hole, and the tip hole are positioned on the same central axis, and an adapter guide is provided inside the insertion hole. The in-adapter guide may have a guide groove or an in-adapter guide hole for guiding the welding wire, and the tip of the guide groove or the in-adapter guide hole may be deviated from the central axis. preferable.
In this case, the welding wire guided by the guide groove or the guide hole in the adapter is at a position deviated from the central axis at the tip of the guide groove or the guide hole in the adapter, so it does not come into contact with the guide hole located on the central axis. Cheap. Therefore, power can be reliably supplied to the welding wire, the efficiency of power supply is high, and the stability of power supply can be improved.

Preferably, the wire guide is press-fitted and fixed to the chip body, and the wear-resistant member is made of ceramic.

ADVANTAGE OF THE INVENTION According to this invention, the contact tip for welding which can reduce running cost and manufacturing cost can be provided.

1 is a longitudinal sectional view showing a contact tip for welding according to an embodiment of the present invention; FIG. FIG. 2A is a perspective view and FIG. 2B is a vertical cross-sectional view of a wear-resistant member of the welding contact tip of FIG. 1;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below based on the drawings.
As shown in FIG. 1, the welding contact tip of the embodiment of the present invention has an adapter 1, an adapter internal guide 2, a tip body 3, a wear resistant member 4, and a wire guide 5. .
The adapter 1 is electrically conductive and has a tubular shape, with a front end portion 11 gradually tapering and a rear end portion 12 forming a step 13 and tapering. A male threaded portion 14 is formed on the outer periphery of the rear end portion 12 for attachment to the inside of the torch nozzle. A female screw portion 15 is formed on the inner periphery of the distal end portion 11 . The adapter 1 has an insertion hole 16 through which the welding wire 6 can be inserted on the longitudinal central axis.

The in-adapter guide 2 is arranged inside the insertion hole 16 . A step 17 is provided inside the insertion hole 16, and the front portion 16a of the insertion hole 16 has a smaller diameter than the rear portion 16b. A distal end portion 16 c of the insertion hole 16 narrows to a size slightly larger than the diameter of the welding wire 6 . The in-adapter guide 2 is cylindrical and has guide grooves 21 for guiding the welding wire 6 extending to both ends on the sides. The bottom of the guide groove 21 is offset from the central axis from the rear end to the tip.

The chip body 3 has conductivity, and a male threaded portion 32 that is screwed into the female threaded portion 15 of the adapter 1 is formed on the outer circumference of the rear end portion 31 . The chip body 3 is detachably connected to the adapter 1 by screwing. The tip body 3 has an accommodating portion 33 communicating with the insertion hole 16 therein, and a leading end portion 34 has a penetrating tip hole 35 communicating with the accommodating portion 33 and through which the welding wire 6 can be inserted. The tip hole 35 narrows to a size slightly larger than the diameter of the welding wire 6 .

The wear resistant member 4 is made of a material having higher wear resistance than the tip body 3, such as ceramic. As shown in FIG. 2, the wear resistant member 4 is cylindrical and has a through hole 41 through which the welding wire 6 can be inserted. Both ends of the through-hole 41 are inclined outward. The wear-resistant member 4 is arranged in the accommodating portion 33 in contact with the tip portion 34 of the tip body 3 , and the through hole 41 communicates with the tip hole 35 .

The wire guide 5 is cylindrical and conductive. The wire guide 5 is arranged in the housing portion 33 so as to sandwich and hold the wear resistant member 4 between itself and the tip portion 34 . The wire guide 5 has a guide hole 51 which communicates with the insertion hole 16 and the through hole 41 on the central axis and allows the welding wire 6 to be inserted in contact with the guide hole 51 . The wire guide 5 is in contact with the tip body 3 and is press-fitted into the accommodation portion 33 of the tip body 3 and fixed. The wire guide 5 has a function of preventing the wear resistant member 4 from coming off.
The insertion hole 16 of the adapter 1, the accommodation portion 33 of the tip body 3, the guide hole 51 of the wire guide 5, the through hole 41 of the wear resistant member 4, and the tip hole 35 of the tip body 3 are located on the same central axis. there is

Next, the action will be described.
The welding contact tip is placed inside the torch nozzle and used by attaching it to the welding wire feed. The welding wire 6 is inserted from the insertion hole 16 of the adapter 1 into the accommodation portion 33 of the tip body 3 , the guide hole 51 of the wire guide 5 , the through hole 41 of the wear resistant member 4 and the tip hole 35 of the tip body 3 . In use, the welding wire 6 is energized to melt the weld metal.
As shown in FIG. 1, the contact tip for welding has the wear-resistant member 4 in contact with the tip 34 of the tip body 3 and is arranged in the accommodating portion 33, thereby suppressing wear due to the welding wire 6 and extending the product life. be able to. The wear-resistant member 4 has high durability and can suppress diameter expansion to prevent displacement of the welding position. The wire guide 5 and the tip portion 34 of the tip body 3 sandwich and hold the wear resistant member 4 . The wire guide 5 can feed the welding wire 6 by allowing the welding wire 6 to come into contact with the guide hole 51 and pass through the guide hole 51 .
The welding wire 6 guided by the guide groove 21 is located at a position deviated from the central axis at the tip of the guide groove 21, so that it easily comes into contact with the guide hole 51 positioned on the central axis. Therefore, power can be reliably supplied to the welding wire 6, the efficiency of power supply is high, and the stability of power supply can be improved.

Since the chip body 3 is detachable from the adapter 1, the running cost can be reduced by exchanging only the chip body 3. Moreover, since the wear-resistant member 4 may be made of an insulator such as ceramic, it is possible to reduce manufacturing costs by using inexpensive materials.
Further, the adapter guide 2 may have an adapter guide hole instead of the guide groove 21 . In this case, the tip of the intra-adapter guide hole is at a position deviated from the central axis.

1 adapter, 2 guide inside adapter, 3 tip body, 4 wear resistant member,
5 wire guide, 6 welding wire, 11 front end, 12 rear end, 13 step,
14 male screw portion, 15 female screw portion, 16 insertion hole, 16a front portion, 16b rear portion,
16c tip, 17 step, 21 guide groove, 31 rear end, 32 male screw,
33 accommodation part, 34 tip part, 35 tip hole, 41 through hole, 51 guide hole

Claims (3)

an adapter having a conductive insertion hole through which a welding wire can be inserted;
It has an electrically conductive rear end portion that is detachably connected to the adapter, has an accommodating portion that communicates with the insertion hole, and has a distal end portion that communicates with the accommodating portion and penetrates through which the welding wire can be inserted. a tip body having a tip hole;
a wear-resistant member having a higher wear resistance than the tip body, disposed in the accommodating portion in contact with the tip portion, and having a through hole communicating with the tip hole and through which the welding wire can be inserted;
A guide having electrical conductivity and disposed in the accommodating portion so as to sandwich and hold the wear-resistant member between itself and the tip portion, and communicates with the insertion hole and the through hole and through which the welding wire can be inserted in contact. a wire guide having a hole and fixed in contact with the chip body;
A contact tip for welding, characterized by comprising: the insertion hole, the accommodating portion, the guide hole, the through hole and the tip hole are positioned on the same central axis,
An in-adapter guide is provided inside the insertion hole, the in-adapter guide has a guide groove or an in-adapter guide hole for guiding the welding wire, and the tip of the guide groove or the in-adapter guide hole is the that it is located off the central axis,
The contact tip for welding according to claim 1. wherein the wire guide is press-fitted and fixed to the tip body, and the wear-resistant member is made of ceramic;
The contact tip for welding according to claim 1 or 2.

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