JPH07256461A - Contact tip for welding - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Good productivity, long life, reduction in use cost, and reduction in cost of automatic arc welding or semi-automatic arc welding. A welding contact tip made of a conductive material and having a wire passage 3 used in automatic arc welding or semi-automatic arc welding, and a contact tip having a screw hole 4 formed along the wire passage at its tip. A body 1 and a contact tip 2 having a threaded portion 5 formed along a wire path, and a screw hole 4 formed in the contact tip body and a screw formed in the contact tip. A contact tip for welding, which is integrally formed by screwing the portion 5 with the contact surface of the contact tip body and the flange surface of the tip of the contact tip in contact with each other. , And the contact tip body are also made of wear resistant material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding contact tip used in automatic arc welding or semi-automatic arc welding, and more specifically, it has a long life and suppresses welding of a wire due to sparking. The present invention relates to a contact tip for welding which is possible, has good productivity, and has a low use cost.

[0002]

As is well known, a contact tip for welding is used in automatic arc welding or semi-automatic arc welding, and the contact tip for welding is made of a copper alloy which is a conductive material. In the cylindrical member having a wire passage for passing a welding wire, the welding wire is inserted into the wire passage formed in the contact tip for welding, while supplying the welding wire. Arc welding is performed at the tip.

By the way, the above welding contact tip is worn at the tip portion of the wire passage due to the welding wire which is inserted and supplied into the wire passage during arc welding, and the tip portion is arc welded. Since it is sometimes exposed to high temperatures, wear is more likely to occur, the shape of the wire passage is deformed from a perfect circle to an ellipse, and the supply of welding wire to the welding location becomes unstable, resulting in a good arc. There is a problem that welding becomes impossible and work can not be done due to welding of wires by sparks.To solve the problem, the tip of the welding contact tip is frequently sanded. It is necessary to correct it by shaving, etc., or replace it, and its use cost (tangible / intangible) is high, and automatic arc welding or semi-automatic arc melting It has been very difficult to reduce the cost of.

Therefore, in order to prolong the service life of the welding contact tip, reduce its use cost, and reduce the cost of automatic arc welding or semi-automatic arc welding, the actual open sho 60-20372 and the open 62 -16977
As shown in Fig. 4, a ring made of wear-resistant material is press-fitted or enclosed in the wear-prone part such as the tip of the welding contact tip to prolong the life of the welding contact tip and reduce its use cost. It was a proposal to reduce it.

[0005]

According to the above-mentioned conventional technique, in order to prolong the service life of the welding contact tip,
A ring made of wear-resistant material is press-fitted or sealed into a portion of the welding contact tip where wear is severe, such as a tip. The ring made of wear-resistant material is press-fitted into the welding contact tip. Is prone to cracks in the contact tip for welding where the ring is press-fitted, especially when exposed to high temperatures during arc welding. In addition to being difficult, it has a short life due to the welding of the wire by sparks and its workability (accuracy) is not good, and when the ring is sealed, its workability is low. And because of poor productivity, it is likely to cause high cost, resulting in extension of service life of welding contact tip and reduction of use cost, that is, automatic arc welding or semi-automatic arc welding. Cost reduction were those poorly realized.

[0006]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to solve the problems of the prior art as described above, and not only has its service life be long, but also the wire of sparks. It is an object of the present invention to provide a contact tip for welding, which has good productivity by suppressing welding and thus has low use cost and which can reduce the cost of automatic arc welding or semi-automatic arc welding.

[0007]

In order to achieve the above object, the present invention has the following technical means. That is, to explain using the reference numerals used in the accompanying drawings corresponding to the examples, in a welding contact tip made of a conductive material and having a wire passage used in automatic arc welding or semi-automatic arc welding, The welding contact tip has a contact tip body 1 having a screw hole 4 formed along the wire passage 3 at its tip, and a contact tip tip portion 2 having a screw portion 5 formed along the wire passage 3.
The contact hole 6 formed on the contact tip body 1 and the screw portion 5 formed on the contact tip tip portion 2 include a contact surface 6 of the contact tip body 1 and a flange of the contact tip tip portion 2. A contact tip for welding, characterized in that it is configured to be screwed in a state in which the surface 7 is in contact, and the tip portion 2 of the contact tip is made of a wear-resistant material. The main body 1 and the contact tip end portion 2 are made of a material having wear resistance, which is a contact tip for welding.

[0008]

The present invention comprises the above technical means, and the welding contact tip used in automatic arc welding or semi-automatic arc welding is formed along the wire passage 3 formed in the welding contact tip. Screw holes 4
Since the contact tip body 1 has a tip, and the contact tip tip 2 has a screw portion 5 formed along the wire passage 3, the contact tip tip 2 can be replaced, and By being made of a wear-resistant material, wear and deformation of the wire passage 3 formed at the tip 2 of the contact tip due to advancing of the welding wire are prevented, and welding of the wire by spark is prevented. The use life of the welding contact tip itself can be extended to a small extent, the use cost can be reduced, and automatic arc welding or semi-automatic arc welding can be performed at low cost.

Further, the screw hole 4 formed on the contact tip body 1 and the screw portion 5 formed on the tip end portion 2 of the contact tip are attached to the contact surface 6 of the contact tip body 1.
Since the contact tip body 1 and the contact tip tip 2 are integrated by screwing the contact tip and the flange surface 7 of the contact tip tip 2 into contact with each other, when the contact tip for welding is formed. It is possible to easily obtain the dimensional accuracy and the heat dissipation effect required for the above, so that the productivity is improved and the welding contact tip can be manufactured at low cost.

Further, the contact tip body 1 can be easily formed by cutting a conventional contact tip for welding into a predetermined size and processing a screw hole 4 at the tip portion thereof. The welding contact tip can be diverted, so that the welding contact tip can be manufactured at a lower cost.

Then, a contact tip body 1 and a contact tip end portion 2 constituting a welding contact tip.
Since and are made of wear-resistant material, not only the wear resistance of each is improved, and not only the life is extended, but also the coefficient of thermal expansion is the same. Even when the contact tip becomes hot, cracking due to deformation or distortion is less likely to occur, so that the service life of the welding contact tip can be extended and the use cost can be further reduced. It is possible.

[0012]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. As shown in FIG. 1, the welding contact tip used in the automatic arc welding or the semi-automatic arc welding of the present invention comprises a contact tip body 1 and a contact tip tip portion 2, The tip body 1 and the contact tip tip portion 2 are integrally formed by joining them to form a welding contact tip, and the contact tip tip portion 2 is worn by automatic arc welding or semi-automatic arc welding.
Only the exchange is possible.

The contact tip body 1 is
As shown in FIG. 2, it is a cylindrical member having a screw hole 4 formed along the wire passage 3 at its tip, and a contact tip for welding is provided at the rear end thereof in an automatic arc welding device or a semi-automatic arc welding device. A screw portion is formed as a mounting portion 9 for mounting.

The tip portion 2 of the contact tip
3 is a cylindrical member having a threaded portion 5 formed along the wire passage 3 as shown in FIG. 3, and is formed so as to be screwed into the screw hole 4 of the contact tip body 1. There is something.

The contact tip body 1 and the contact tip tip portion 2 are joined to each other by using the screw holes 4 and the screw portions 5 respectively formed in the contact tip body 1 and the contact surface 6 at the tip end of the contact tip body 1. It is carried out by screwing the flange surface 7 formed on 2 in contact with each other. The centering of the wire passage can be surely performed, and required dimensional accuracy can be easily satisfied, and the product It is possible to manufacture a contact tip for welding at a low cost, which is unlikely to cause defects. Further, even when the tip 2 of the contact tip is exchanged, similarly good dimensional accuracy can be obtained. Further, since the contact surface 6 and the flange surface 7 are in contact with each other and rubbed against each other, the contact tip end portion 2 can be reduced. Hardly occurs loosening of screwing, the falling can be prevented, in which can form a highly reliable welding contact tip.

Further, in order to more securely screw the contact tip body 1 and the contact tip end portion 2 into each other,
Tightening portions 10a and 10b are formed respectively, and by fastening the fastening portions 10a and 10b with a wrench or the like, the joining between the contact tip body 1 and the contact tip tip portion 2 is completed.

The contact tip body 1 and the contact tip end portion 2 are made of a conductive material, which may be a single metal such as copper or silver, MCZ or alumina dispersed copper. , Zinc copper, NB
C, bery copper (Be25, Be50), copper alloys such as chromium copper, tungsten alloys such as copper tungsten and silver tungsten, nickel alloys, titanium alloys, stainless alloys, ceramics, and the like are considered. By using a material having excellent wear resistance as the material for forming the tip 2 of the contact tip, it is possible to form a welding contact tip having a long service life.

Further, by forming the contact tip body 1 and the contact tip end portion 2 with a material having abrasion resistance, the abrasion resistance of each is improved, and the life is extended, and in addition, the heat of each is increased. Even if the welding contact tip has a high temperature during arc welding and has the same expansion coefficient, cracks due to deformation and distortion are less likely to occur, thus extending the service life of the welding contact tip. Is what you can do.

For the contact tip body 1 and the contact tip tip portion 2, nickel, hard chrome, zinc, chrome, unichrome, copper, silver, etc.
Also, by applying composite plating, it is possible to improve the wear resistance of each, so that the life is longer,
It is possible to form a contact tip for welding whose use cost is low.

Further, by forming the tapered portions 8a and 8b at the entrance portions of the wire passages 3 formed in the contact tip body 1 and the contact tip tip portion 2, the welding wire can be easily inserted into the wire passages 3. Therefore, the welding contact tip can be easily set.

Further, the contact tip body 1 is
The conventional welding contact tip can be easily formed by cutting it into a predetermined size and processing the screw hole 4 at its tip. Therefore, the welding tip conventionally used can be diverted. Therefore, the contact tip for welding can be provided at a lower cost.

[0022]

As described above in detail, according to the present invention, the following effects can be obtained. That is, according to claim 1, the welding contact tip used in the automatic arc welding or the semi-automatic arc welding of the present invention has a screw hole formed along the wire passage formed in the welding contact tip. A contact tip body having a tip and a contact tip tip having a threaded portion formed along the wire passage are divided, and a screw hole and a threaded portion formed in each of the contact tip have a contact tip. Since the contact surface of the main body and the flange surface of the tip end of the contact tip are configured to be screwed together, the required dimensional accuracy can be easily obtained.
Therefore, the productivity is improved, and the contact tip for welding can be manufactured at low cost. Moreover, the tip of the contact tip is replaceable, and the welding of the wire due to the spark is small and the wear resistance is low. Since it is made of a conductive material, it is possible to provide a welding contact tip which can prolong the service life of the welding contact tip itself and can reduce its use cost.

In addition, the contact tip body can be easily formed by cutting a conventional welding contact tip to a predetermined size and forming a screw hole at the tip of the contact tip. The contact tip can be used, and therefore, there is an advantage that the contact tip for welding can be provided at a lower cost.

Further, according to claim 2, since the contact tip body and the tip of the contact tip constituting the contact tip for welding are formed of a material having abrasion resistance, respective abrasion resistance is improved. However, in addition to having a long life, the thermal expansion coefficient of each is the same, and even if the welding contact tip becomes high temperature during arc welding, cracking due to deformation or distortion does not easily occur. Therefore, the service life of the welding contact tip can be extended and the use cost thereof can be further reduced.

[Brief description of drawings]

FIG. 1 is a front view showing a configuration of a welding contact tip of the present invention.

FIG. 2 is a cross-sectional view showing a contact tip body.

FIG. 3 is a cross-sectional view showing a tip portion of a contact tip.

[Explanation of symbols]

 1 Contact tip body 2 Contact tip end part 3 Wire passage 4 Screw hole 5 Screw part 6 Contact surface 7 Flange surface

Claims (2)

[Claims] 1. A welding contact tip made of a conductive material and having a wire passage used in automatic arc welding or semi-automatic arc welding, wherein the welding contact tip is formed along a wire passage 3. Contact tip body 1 having a screw hole 4 formed at the tip, and a screw portion 5 formed along the wire passage 3
A screw hole 4 formed in the contact tip body 1 and a screw portion 5 formed in the contact tip body 2 and a contact surface 6 of the contact tip body 1. A contact tip for welding, characterized in that it is configured to be screwed in a state where the flange surface 7 of the contact tip end portion 2 is in contact, and the contact tip end portion 2 is made of a wear resistant material. 2. The contact tip for welding according to claim 1, wherein the contact tip body 1 and the contact tip end portion 2 are made of a material having wear resistance.