Method of restarting a plasma arc torch using a periodic high fr

Details Method of restarting a plasma arc torch using a periodic high fr Method of restarting a plasma arc torch using a periodic high fr

1992-05-19

1994-03-22

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912154, 21912159, B23K 900

Patent

active

052966658

ABSTRACT:
A high frequency, high voltage starting circuit for a plasma arc cutting torch is operated in pulses to restart the torch if an initial arc extinguishes before the arc transfers to the workpiece. The starting circuit includes a D.C. power supply with its negative output connected to an electrode of the torch. A positive output is connected to a nozzle, and at a higher positive voltage, to a workpiece. A surge injector circuit of a resistor and surge capacitor is connected in parallel with the power supply to supply current to the arc as soon as breakdown occurs. The duration of the interval between restart pulses is sufficient to allow the surge injector circuit to recharge to a value that will reliably restart the arc as the power supply ramps up to a steady state pilot arc current.

REFERENCES:
patent: 3447322 (1969-06-01), Mastrup
patent: 4791268 (1988-12-01), Sanders et al.
patent: 4943699 (1990-07-01), Thommes
patent: 4996407 (1991-02-01), Traxler
patent: 5036176 (1991-07-01), Yamaguchi et al.
patent: 5086205 (1992-02-01), Thommes
patent: 5111024 (1992-05-01), Patron et al.

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