JPH10328840A - Welding torch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the invasion of a spatter into a welding torch and to maintain excellent welding quality without disturbing the flow of the shield gas fed to the weld zone. SOLUTION: The welding torch cap 3, consisting of the cap 3a wherein the outer diameter is formed larger than the inner diameter of the tip end of the welding torch 1, the wire hole passing a welding wire is formed at the center and plural gas feeding holes are radially formed making the wire hole the enter, and plural mounting members 3d wherein a spring property is provided, one end is fixed to the cap 3a so as to exist in the inner side than the inner diameter of the welding torch 1 and the free end exists on the circumference of a circle equal/larger to/than the outer diameter of the cap 3a, is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding torch and, more particularly, to a welding torch used for wire feeding type shield gas welding.

[0002]

2. Description of the Related Art In shield gas welding of a wire feeding type, spatter generated and scattered at a welded portion enters into a welding torch and adheres and accumulates to block a gas passage and obstruct a flow of a shielding gas. This causes a serious problem in welding work, such as occurrence of poor welding.

In order to solve such a problem, for example, as disclosed in Japanese Utility Model Laid-Open No. 15873/1987, it has been proposed to provide a spatter intrusion prevention member at the tip of a welding torch.

In this welding torch, a spatter preventing member made of ceramics having a large number of fine holes having a diameter of 0.1 to 0.05 mm is provided at a tip portion thereof, so that a spatter generated at a welding portion is provided. In the welding torch.

[0005]

In such a member for preventing intrusion of spatter, since a hole having a diameter smaller than the particle diameter of sputter is formed in the ceramic member in an inclined state, not only is processing difficult, but also spatter intrusion is prevented. The prevention member becomes expensive. Further, since the hole diameter is small, it is necessary to increase the gas pressure supplied to the welding torch in order to secure the gas flow rate. Further, the hole is closed by the spatter adhering to the tip of the spatter intrusion prevention member, and the supply of the shielding gas becomes insufficient, which causes a welding defect.

In view of the above circumstances, an object of the present invention is to reduce the invasion of spatter into a welding torch and to maintain good welding quality without obstructing the flow of a shielding gas supplied to a welding portion. It is an object of the present invention to provide a welding torch.

[0007]

In order to achieve the above object, a first aspect of the present invention is to provide a welding apparatus in which an outer diameter is formed larger than an inner diameter of a welding torch tip, and a wire hole for passing a welding wire is formed at the center. A cap having a plurality of gas supply holes formed radially around the wire hole; a cap having a spring property, one end of which is fixed to the cap so as to be located inside the inner diameter of the welding torch; Provided a welding torch cap comprising a plurality of mounting members located on the circumference of the same size or larger than the outer diameter of the cap.

According to a second aspect of the present invention, there is provided a net-like cap having an outer diameter larger than an inner diameter of a tip end of the welding torch and formed so as to be narrower from the center toward the outer circumference, and has a spring property. And a plurality of mounting members each having one end fixed to the cap so as to be located inside the inner diameter of the welding torch, and a free end located on a circumference having the same size as or larger than the outer diameter of the cap. A welding torch cap was provided.

Further, in the third invention, the cap is coated with ceramics so that spatter is hardly adhered.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention.
FIG. 1 is a side sectional view of a tip of a welding torch to which a welding torch cap is attached.
FIG. 2 is a bottom view of the welding torch cap, and FIG. 3 is a side view of the welding torch cap.

In FIG. 1, reference numeral 1 denotes a welding torch. Reference numeral 2 denotes a power supply tip, which is fixed to the welding torch 1. Reference numeral 3 denotes a welding torch cap, which is detachably attached to the tip of the welding torch 1. A welding wire 4 penetrates the power supply tip 2 and the welding torch cap 3 and protrudes from the tip of the welding torch 1.

Reference numeral 3a denotes a cap, which is a metal plate having a thickness of about 1 mm, the outer diameter of which is larger than the inner diameter of the tip of the welding torch 1; Radially multiple gas supply holes 3c
Are formed.

Reference numeral 3d denotes a mounting member having a spring property, one end of which is located inside the inner diameter of the tip of the welding torch 1 and the other end of which has a circumference equal to or larger than the outer diameter of the cap 3a. The cap 3a so as to be positioned above
It is fixed to.

With such a configuration, when the welding torch cap 3 is attached to the welding torch 1, the welding wire 4 protruding from the tip of the welding torch 1 is inserted into the wire hole 3.
In this state, the free end of the attachment member 3d is bent inward and inserted into the welding torch 1 and pushed in until the cap 3a contacts the tip of the welding torch 1.

When the welding torch cap 3 is detached from the welding torch 1, the welding torch cap 3 is removed.
However, since the welding torch 1 is held only by the spring force of the mounting member 3d, the welding torch 1 can be removed from the welding torch 1 only by pulling the welding torch cap 3.

A part of the spatter generated at the welding portion and flying toward the welding torch 1 adheres to the cap 3a and is captured, and the one that has passed through the gas hole 3c adheres and accumulates inside the welding torch 1. I do. Therefore, the amount of spatter entering the welding torch 1 can be regulated by the ratio of the opening area at the tip of the welding torch 1 to the area of all the gas holes 3c.

Therefore, the size of the gas hole 3c can be arbitrarily set irrespective of the particle size of the spatter, so that good welding quality can be maintained without obstructing the supply of the shielding gas.

FIGS. 4 to 6 show a second embodiment of the present invention.

In FIG. 1, the same components as those in FIG. 1 are denoted by the same reference numerals. Reference numeral 5 denotes a welding torch cap, and a frame 5a formed to be larger than the inner periphery of the tip of the welding torch 1.
Further, it is composed of a plurality of wires 5b arranged so as to form a mesh having a coarse central portion and a fine outer peripheral portion, and a mounting member 5c fixed to the outer peripheral portion.

With such a configuration, similarly to the above-described embodiment, it can be easily attached to and detached from the welding torch 1, and spatter entering the welding torch 1 can be restricted. Further, good welding quality can be maintained without obstructing the flow of the shielding gas.

In each of the above embodiments, the welding torch caps 3, 5 are coated with alumina-based or silicon nitride-based ceramics after the mounting members 3c, 5c are mounted thereon, so that the spatter adheres. By making it difficult, the life of the welding torch caps 3 and 5 can be extended.

[0022]

As described above, according to the present invention, it is possible to control the amount of spatters entering the welding torch, secure the flow of the shielding gas, and maintain good welding quality.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a tip of a welding torch to which a welding torch cap is attached.

FIG. 2 is a bottom view of a welding torch cap.

FIG. 3 is a side view of a welding torch cap.

FIG. 4 is a plan view of a welding torch cap.

FIG. 5 is a side view of a welding torch cap.

FIG. 6 is a side sectional view of a tip portion of a welding torch to which a welding torch cap is attached.

[Explanation of symbols]

Claims (3)

[Claims] A cap having an outer diameter larger than an inner diameter of a tip of the welding torch, a wire hole through which a welding wire is formed at the center, and a plurality of gas supply holes radially formed around the wire hole; A plurality of springs having one end fixed to the cap so that one end thereof is located inside the inner diameter of the welding torch, and the free end of which is located on a circumference having the same size as or larger than the outer diameter of the cap. A welding torch characterized by providing a welding torch cap comprising: 2. A net-like cap whose outer diameter is formed larger than the inner diameter of the tip of the welding torch, and is formed so that eyes are narrowed from the center to the outer circumference. A welding torch cap fixed to the cap so as to be located inside the inner diameter of the torch and having a plurality of mounting members whose free ends are located on the circumference of the same size or larger than the outer diameter of the cap. A welding torch characterized by being provided. 3. The welding torch according to claim 1, wherein a welding torch cap is provided in which the cap is coated with ceramics.