US 3,937,915 A · Metal working method using electric arc and jet gas and the apparatus therefor

Abstract

The method and apparatus in accordance with the present invention achieve the same working effect as grooving, drilling, cutting, and the like on a metal work by blowing off, with the use of a non-combustible jet gas, the molten metal heated and made molten by an electric arc. The atmosphere at the operating location where the electric arc and the jet gas are provided, is formed by a fluid atmosphere produced by the discharge of a non-combustible liquid. As a result, matters and substance such as dust particles, carbon monoxide, and the like existing around the operating location and serving to deteriorate the operating environment, are adsorbed and taken up by the fluid atmosphere for decreasing the amount of such matters and substance which are released to the operating environment surrounding the fluid atmosphere.

Claims16

Dependent claims

A metal working method for removing a portion of a metal work piece, comprising the steps of:

generating an electric arc between an electrode bar and the metal work piece;
heating and melting a portion of the metal work piece with the arc;
discharging, during the step of heating and melting, a non-combustible gas in the form of a jet gas to the heated and molten portion of the metal work piece and the surrounding environment of the portion for blowing off the molten portion;
mixing a non-combustible liquid in the non-combustible compressed gas;
discharging the non-combustible liquid together with the non-combustible gas to form a jet spray;
and supplying the jet spray to the molten portion of the metal work piece and the surrounding environment of the portion.

3 more elements

A metal working apparatus comprising:

an electrode bar supporting means for supporting an electrode bar with a suitable space kept between the electrode bar and a metal work piece;
a power supply means for applying a voltage across the metal work piece and the electrode bar to generate an electric arc in the space to heat and make molten a portion of the metal work piece and the surrounding environment of the portion, a compressed gas supply means for providing a non-combustible compressed gas in the form of a jet gas to blow off the molten metal;
a first passage through which the non-combustible compressed gas passes;
liquid supply means for injecting a non-combustible liquid into said first passage through which the non-combustible compressed gas passes;
and means for discharging the non-combustible liquid together with the non-combustible compressed gas to form a jet spray and for supplying the jet spray to the portion of the metal work piece heated and made molten and the surrounding environment of the portion.

2 more elements

Dependencies are inferred from the claim text.

Metal working method using electric arc and jet gas and the apparatus therefor

Life of this patent

Metal working method using electric arc and jet gas and the apparatus therefor

Life of this patent

Abstract

Claims16