Plasma pilot arc control

Details Plasma pilot arc control Plasma pilot arc control

1997-02-24

1999-02-02

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912157, 21912144, 21912154, B23K 1000

Patent

active

058668691

ABSTRACT:
A method and apparatus for controlling and maintaining a continuous flow of pilot arc current in a plasma cutting torch includes a pilot circuit, a current sensing circuit, and a control circuit. The control circuit maintains a continuous flow of pilot current through the pilot circuit both before and after a cutting arc has been generated. The control circuit further controls the magnitude of the pilot current in response to the sensing circuit indicating the absence or presence of the cutting arc.

REFERENCES:
patent: 4791268 (1988-12-01), Sanders et al.
patent: 4902871 (1990-02-01), Sanders et al.
patent: 5170030 (1992-12-01), Solly et al.
patent: 5530220 (1996-06-01), Tatham
patent: 5620617 (1997-04-01), Borowy et al.
patent: 5630952 (1997-05-01), Karino et al.

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