JP2580080B2 - Arc welding torch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc welding torch used for welding work.

[0002]

2. Description of the Related Art An example of a conventional torch for arc welding is shown in FIG.
This will be described with reference to FIG.

In FIG. 3, reference numeral 1 denotes a tubular torch main body;
Is a wire guide for guiding a consumable electrode wire (hereinafter, referred to as a wire) 3 to a contact tip 4, which is inserted into the torch main body 1 from a base end thereof. 1
Reference numeral 2 denotes a wire guide base provided at a base end of the wire guide 2, which is locked to a base end of the torch main body 1. Reference numeral 5 denotes an annular space formed between the torch main body 1 and the wire guide 2, and serves as a shield gas passage. The shielding gas sent to the tip of the torch main body 1 through the annular space 5 is supplied from the nozzle 8 to the welding portion. Further, the contact tip 4 supplies power to the wire 3 fed from the wire guide 2.

[0004]

The conventional torch for arc welding has the following problems.

Usually, in order to enhance the workability of the welding operation, a wire feeding device (not shown) and the torch main body 1 are connected by a flexible torch cable (not shown) of about 3 to 6 m. The torch cable is bent into a complicated shape in various welding operations.

For this reason, the wire 3 sent from the wire feeder causes complicated vibrations and minute fluctuations in speed while passing through the torch cable, and the wire 3 passes through the wire guide 2 to the contact chip 4. When supplied, the contact power supply to the wire 3 at the contact tip 4 becomes unstable, which is a major factor causing arc instability.

Further, in addition to normal lubricating oil, wire shavings and other fine impurities adhere to the surface of the wire 3 while passing through the torch cable. It was stable.

In order to solve such a problem, the torch main body 1 having a curved portion so as to give an appropriate curvature to the wire 3 is used for the purpose of improving the contact power supply at the contact tip 4. However, it was insufficient to keep the arc stable.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide an arc welding torch with a simple structure, capable of stably supplying power to a wire by a contact tip and stabilizing an arc.

[0010]

SUMMARY OF THE INVENTION The present invention relates to an arc welding torch capable of using a plurality of types of consumable electrode wires having different diameters according to applications, and includes a tubular torch main body and one end portion inside the torch main body. And a wire guide inserted through the wire guide and having a hole inside the wire guide.
Elastic members are provided so that they can be replaced concentrically, and
The diameter of the consumable electrode wire can be made smaller than the outer diameter of the consumable electrode wire .

Preferably, one end of the wire guide is provided with a wire guide base having a wire passage hole inside.
An elastic member made of a rubber material or the like is detachably and concentrically arranged inside the wire guide base.

[0012]

According to the torch for arc welding of the present invention, the elastic member plays a role of a stabilizing resistance for stabilizing the wire feeding at the time of wire feeding. Speed fluctuation can be suppressed. Further, since the elastic member has a hole slightly smaller in diameter than the outer diameter of the wire, it has an effect of cleaning the surface of the wire. By such an operation, a stable wire feeding state without complicated vibrations and minute speed fluctuations can be obtained, a clean wire surface is secured, and the contact power supply to the wire by the contact tip is stably maintained. As a result, a stable welding arc is obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an arc welding torch according to an embodiment of the present invention will be described with reference to FIG.

In FIG. 1, reference numeral 1 denotes a tubular torch main body;
Is a wire guide for guiding the wire 3 to the contact tip 4. The wire guide is inserted through a base end of the torch main body 1, and a wire guide base 12 provided at the base end of the wire guide base 12 is connected to the base of the torch main body 1. Locked to the end. 5 is the torch body 1
A connector 7 for holding and fixing the torch body 1 from the gas inlet fitting 6 in an annular space provided between the wire guide 2 and
The passage serves as a passage for guiding the shielding gas guided to the torch main body 1 to the tip of the torch main body 1. This shielding gas is guided from the nozzle 8 to the welding portion. Reference numeral 9 denotes an insulating tube for insulating the torch main body 1 from the nozzle 8, and 10 denotes an insulating tube for insulating the outer periphery of the torch main body 1.

The wire guide 2 is divided at intervals in the middle thereof and connected to each other by a connecting pipe 2a, and an elastic member 11 is disposed on the inner periphery of the connecting pipe 2a.
The wire guide 2 and the connection pipe 2a are connected by means such as screwing and caulking, and the elastic member 11 is arranged concentrically with the wire guide 2 and the connection pipe 2a, and the wire guide is arranged so as not to move in the axial direction. It is sandwiched by the body 2. Elastic member 1
1 is formed with a hole having a diameter slightly smaller than the outer diameter of the wire 3, that is, a hole capable of applying an appropriate resistance for stabilizing the wire feeding within a range not hindering the wire feeding itself. Plays a role of a cushioning material and a stable resistance of feeding, and suppresses vibration of the wire 3 and minute speed fluctuation. At the same time, impurities are removed from the surface of the wire 3 to keep the wire surface clean.

Since the hole of the elastic member 11 is always in contact with the surface of the wire 3 fed at a constant speed during welding, the hole is worn by long-term use. Therefore, it is preferable that the elastic member 11 can be easily replaced.
Such an improved embodiment is shown in FIG.

In FIG. 2, reference numeral 13 denotes a wire guide base provided at the base end of the wire guide 2, and has a wire passage hole inside. This wire guide base 13 is
The base body 13a and the locking portion 13b are screwed together, and the base end of the wire guide 2 is connected to the base body 13a by screwing, caulking, brazing, or the like. The elastic member 11 is disposed concentrically on the inner periphery of the central portion of the base body 13a, and is held by the locking portion 13b so as not to move in the axial direction.

With such a configuration, when the elastic member 11 is worn, it can be easily replaced, and the feeding state of the wire 3 can always be kept optimal.
Further, even for different wire diameters, it can be easily replaced with the elastic member 11 having holes of different diameters.

Here, as the material of the elastic member 11, a rubber material having low hardness and excellent elasticity and abrasion resistance is most effective in order to satisfy the above-mentioned functions. A stable size can be manufactured at a low cost.

[0020]

According to the torch for arc welding of the present invention,
With a simple and inexpensive structure that simply places an elastic member inside the wire guide, it is possible to maintain a stable wire contact power supply at all times without complicating the torch body and greatly reduce welding arc. Can be improved in stability.

[Brief description of the drawings]

FIG. 1 is a half sectional view of an embodiment of an arc welding torch according to the present invention.

FIG. 2 is a half sectional view of a main part of another embodiment of the arc welding torch of the present invention.

FIG. 3 is a half sectional view of a conventional torch for arc welding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torch main body 2 Wire guide 3 Consumable electrode wire 4 Contact tip 11 Elastic member 13 Wire guide base

Claims (3)

(57) [Claims] 1. An arc welding torch capable of using a plurality of types of consumable electrode wires having different diameters according to applications, and a tubular torch main body and a wire inserted through the torch main body from one end thereof. An elastic member having a hole is concentrically provided inside the wire guide body.
Replaceable and the hole is used for the consumable electrode wire used.
An arc welding torch characterized in that the diameter can be made smaller than the outer diameter . 2. A wire guide base having a wire passage hole inside at one end of a wire guide, and an elastic member is detachably and concentrically arranged inside the wire guide base. The torch for arc welding according to claim 1, wherein 3. An arc welding torch according to claim 1, wherein said elastic member is made of a rubber material.