Method and apparatus for operating an arc-transfer type torch

Details Method and apparatus for operating an arc-transfer type torch Method and apparatus for operating an arc-transfer type torch

1974-07-16

1976-04-06

Goldberg, Elliot A.

Electric heating

Metal heating

By arc

B23K 500

Patent

active

039491889

ABSTRACT:
Disclosed is an improved method and apparatus for operating an arc-transfer type torch having a cathode rod and two coaxial annular bodies. According to this invention an inactive gas is supplied to the annular space between the cathode rod and the inner annular body, at a very small flow rate, and an active gas such as oxygen is supplied to the annular space between the inner and exterior annular bodies at a relatively large flow rate. The plasma is composed of an active gas of high concentration heated by a transfer arc.
In the method of this invention dross-less cutting is performed. Also an arc current can be increased without deforming the cathode rod of the torch, and therefore the cutting speed can be increased by raising the arc current.

REFERENCES:
patent: 2935312 (1960-05-01), Kilpatrick et al.
patent: 3602683 (1971-08-01), Hishida et al.
patent: 3604889 (1971-09-01), Rohrberg
patent: 3612807 (1971-10-01), Liekens et al.
patent: 3627965 (1971-12-01), Zweig
patent: 3692973 (1972-09-01), Oku et al.
patent: 3770935 (1973-11-01), Tateno et al.

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