Plasma arc torch ignition circuit and method

Details Plasma arc torch ignition circuit and method Plasma arc torch ignition circuit and method

1993-03-30

1995-05-16

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912154, 21912139, 21912152, B23K 1000

Patent

active

054162971

ABSTRACT:
A high frequency, high voltage starting circuit for a plasma arc cutting torch is constructed and operated with isolation between a pilot arc circuit and a transfer arc circuit. The duration and value of the energy flow in the pilot arc after initiating the HFHV signal are controlled electronically. The maximum value is sufficient to initiate and support the pilot arc and its transfer. The duration is sufficiently long to allow the pilot arc to transfer, but sufficiently short that nozzle wear is reduced. In the preferred form both circuits have a common D.C. power supply and independent surge injector circuits each formed by a resistor and surge capacitor connected in parallel with the power supply. An L-C loop in the pilot arc circuit maintains a generally constant current output on discharge.

REFERENCES:
patent: 3558973 (1971-01-01), Pochert et al.
patent: 4225769 (1980-09-01), Wilkins
patent: 4280042 (1981-07-01), Berger et al.
patent: 4814577 (1989-03-01), Dallavalle et al.
patent: 4996407 (1991-02-01), Traxler
patent: 5170030 (1992-12-01), Solley et al.
patent: 5225658 (1993-07-01), Yamaguchi et al.

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