JP3351038B2 - Welding torch for narrow gap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a narrow groove welding torch.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional narrow groove welding torch, in which 1 is a welding base metal, 2 is a narrow groove formed in the welding base material 1, and 3 is a narrow groove. 2 is a weld bead formed in FIG.

Further, reference numeral 4 denotes a torch block, 5 denotes a welding wire supplied to the torch block 4, and 6 denotes a torch block 4.
A spring-wound insulating conduit liner 7 for guiding the welding wire 5 provided inside the
Is an elongated wire guide attached to the tip of the torch block 4, 8 is a contact tip attached to the tip of the wire guide 7 for supplying power to the welding wire 5, 9 is a connection between the welding base material 1 and the torch block 4. It is a welding power source connected between them.

The wire guide 7 has a very small cross-sectional area of several millimeters in width and ten and several millimeters in thickness.
As shown in FIG. 5, two guide members 10 and 11 are combined, and a wire groove 13 is formed by a V-groove 12 formed on a mating surface of one guide member 11 and a mating surface of the other guide member 10. Is formed.

Then, a very narrow groove, that is, a narrow groove 2
When welding to the torch block 4, an elongated wire guide 7 extended to the tip of the torch block 4 is inserted into the narrow groove 2, and the welding wire 5 is narrowed through the torch block 4, the wire guide 7, and the contact tip 8. By supplying a voltage between the welding base material 1 and the welding wire 5 via the torch block 4, the wire guide 7, and the contact tip 8 by supplying the voltage to the inner part of the groove 2 and the welding power source 9, An arc is generated between the two to perform welding.

[0006]

However, the conventional narrow groove welding torch has the following problems.

That is, in order to ensure necessary heat resistance against welding heat and to guide welding current from the torch block 4 to the contact tip 8, the wire guide 7 is usually
Although made of a copper plate having good conductivity, the wire guide 7
Is made of copper, the welding wire 5 contacts the wire guide 7 on the way of the wire passage 13 and
There is a possibility that power is supplied to the welding wire 5 at the portion (1), and the power supply position may become unstable, resulting in poor welding.

When the power is supplied to the welding wire 5 in the wire guide 7, the welding wire 5 is melted in the wire passage 13 and the wire passage 13 may be clogged.

However, to prevent the contact with the welding wire 5, it is conceivable to widen the wire passage 13.
If the wire passage 13 is widened, the welding wire 5 may buckle in the wire passage 13 to cause feeding instability, and therefore cannot be adopted as a measure for preventing the welding wire 5 from contacting.

Further, in order to prevent contact with the welding wire 5, a conduit liner 6 made of an insulating material is provided in the wire passage 13.
In this case, since the cross-sectional shape of the wire guide 7 becomes large, the wire guide 7 cannot be inserted into the narrow groove 2.

The present invention has been made in view of the above circumstances, and has as its object to provide a narrow groove welding torch that can reliably prevent power supply to a welding wire in a wire guide.

[0012]

SUMMARY OF THE INVENTION The present invention provides one guide
When the V-groove formed on the mating surface of the member and the other guide member
The welding wire to be sent out toward the narrow groove
A wire passage that surrounds in the direction
Insert a wire guide that can be inserted into the lower part of the torch block.
And a contact tip for supplying power to the welding wire is attached to the tip of the wire guide, and the inner surface of the wire passage for guiding the welding wire from the torch block to the contact tip includes glass, ceramics,
The present invention relates to a narrow groove welding torch, wherein an insulating film is formed by either bakelite or mica.

[0013]

The operation of the present invention is as follows.

A wire guide provided at a lower portion of the torch block is inserted into a narrow groove, and a welding wire is guided from the torch block to the contact tip through a wire passage formed inside the wire guide. By supplying power to the welding wire from the attached contact tip, an arc is generated between the welding wire and the narrow groove, and welding is performed.

Since an insulating coating is formed on the wire passage by high heat resistance, a smooth and hard surface, glass, ceramics, bakelite, or mica, power is prevented from being supplied to the welding wire in the wire guide. Also, the wire guide is suitable for insertion into a narrow groove.
In addition, damage to the insulating coating due to welding heat and wear due to sliding of the welding wire are suppressed.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

In the figure, reference numeral 5 denotes a welding wire, 7 denotes an elongated wire guide to be added to the tip of the torch block 4, 10, 1
1 is a guide member constituting the wire guide 7, 12 is a V-groove formed on the mating surface of one guide member 11, and 13 is a V-shaped groove.
The wire passage is formed between the groove 12 and the mating surface of the other guide member 10.

FIGS. 2 to 5 are referred to as needed.

In the present invention, an insulating film 14 such as glass, ceramics, bakelite, or mica is formed on the mating surfaces of the guide members 10 and 11 by a sol-gel method, thermal spraying, sintering, bonding, screwing, or the like.

Next, the operation will be described.

The process of welding the narrow groove 2 is shown in FIG.
5, the elongated wire guide 7 extended to the tip of the torch block 4 is inserted into the narrow groove 2, and the welding wire 5 is narrowed through the torch block 4, the wire guide 7, and the contact tip 8. Along with supplying to the back of groove 2,
By applying a voltage between the welding base material 1 and the welding wire 5 via the torch block 4, the wire guide 7, and the contact tip 8 by the welding power source 9, an arc is generated between the two and welding is performed. .

At this time, according to the present invention, the welding wire 5 comes into contact with the wire passage 13 by covering the wire passage 13 formed in the wire guide 7 with an insulating coating 14 such as glass, ceramics, bakelite or mica. Even in this case, the power supply to the welding wire 5 at the wire guide 7 is reliably prevented. So always,
Since power is supplied at the contact tip 8, the power supply position to the welding wire 5 is stabilized, and good welding can always be performed.

Moreover, since the insulating film 14 made of glass, ceramics, bakelite, mica or the like is an extremely thin film, the cross-sectional area of the wire guide 7 is hardly increased, and therefore, the welding to the narrow groove 2 is not performed. Can maintain ability.

The insulating film 14 made of glass, ceramics, bakelite, mica or the like has high heat resistance, so that it is not damaged by welding heat, so that welding can be performed without any trouble.

Further, since the insulating film 14 made of glass, ceramics, bakelite, mica or the like has a hard and smooth surface, the feeding resistance of the welding wire 5 can be reduced, and thus the feeding property of the welding wire 5 can be reduced. Be improved.

In addition, since the insulating film 14 such as glass, ceramics, bakelite, and mica has high wear resistance, the insulating film 14 hardly wears due to sliding of the welding wire 5 to prevent a short life of the apparatus. Can be.

It should be noted that the present invention is not limited only to the above-described embodiment, and it is needless to say that various changes can be made without departing from the spirit of the present invention.

[0029]

As described above, according to the narrow groove welding torch of the present invention, an insulating coating is formed on a wire passage by glass, ceramics, bakelite, or mica, which has high heat resistance and a smooth and hard surface. The power supply to the welding wire in the wire guide can be reliably prevented, and the wire guide can be inserted into the narrow groove.
It is possible to obtain an excellent effect that it can be formed into a shape suitable for insertion, and furthermore, it is possible to suppress damage to the insulating coating due to welding heat and wear due to sliding of the welding wire.

[Brief description of the drawings]

FIG. 1 is a sectional view of a wire guide according to one embodiment of the present invention.

FIG. 2 is an overall schematic side view of a conventional example.

FIG. 3 is a partially enlarged view of FIG. 2;

4 is a view taken in the direction of arrows IV-IV in FIG. 3;

FIG. 5 is a view taken in the direction of arrows VV in FIG. 4;

[Explanation of symbols]

 2 Narrow groove 4 Torch block 5 Welding wire 7 Wire guide 8 Contact tip 13 Wire passage 14 Insulation coating

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Ikuo Shiina 1st place, Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Pref. Ishikawajima-Harima Heavy Industries Co., Ltd. JP-A-56-134080 (JP, A) JP-A-58-157275 (JP, U) JP-A-61-177778 (JP, U) JP-A-62-3282 (JP, U) (58) (Int.Cl. ⁷ , DB name) B23K 9/29 B23K 9/133 B23K 9/173

Claims (1)

(57) [Claims] 1. A guide member formed on a mating surface of one guide member.
Toward a narrow groove by the mating surface of the V groove and the other guide member
Wire passage circumferentially surrounding the welding wire to be delivered
And a wire guide having a shape insertable into the narrow groove.
And a contact tip for supplying power to the welding wire is provided at the lower end of the torch block , and at the inner surface of the wire passage for guiding the welding wire from the torch block to the contact tip. A narrow groove welding torch characterized in that an insulating film is formed of any one of glass, ceramics, bakelite, and mica.