Arc transfer circuit

Details Arc transfer circuit Arc transfer circuit

1997-03-18

1998-12-08

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912139, 21912159, 21912157, B23K 1000

Patent

active

058473548

ABSTRACT:
A circuit for providing D.C. current from a power source having a current regulating input to a plasma system including an electrode and a nozzle with a plasma arc opening exposing the electrode to a juxtapositioned workpiece, which circuit has a first circuit branch for creating a pilot arc across the electrode and nozzle, a second circuit branch for creating an operative plasma arc across the electrode and the workpiece, a current sensor in the second circuit branch for sensing the workpiece current in the second circuit branch, a switch for opening the first circuit branch when the sensed workpiece current exceeds a preselected current to transfer the pilot arc to the operative plasma arc, a system for regulating the current in the first circuit branch until the arc transfer and a circuit for increasing the pilot current supplied from said power source to first circuit branch when sensed workpiece current exceeds a low threshold value.

REFERENCES:
patent: 5506384 (1996-04-01), Yamaguchi
patent: 5530220 (1996-06-01), Tatham
patent: 5630952 (1997-05-01), Karino et al.

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