Method of igniting a plasma arc as well as an arrangement for ca

Details Method of igniting a plasma arc as well as an arrangement for ca Method of igniting a plasma arc as well as an arrangement for ca

1987-11-25

1988-08-16

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

373 18, 373 22, C22B 400, H05B 718

Patent

active

047642084

ABSTRACT:
An auxiliary plasma arc fed by an auxiliary circuit serves for igniting a plasma arc, fed by a main circuit, of a plasma burner provided in a metallurgical furnace vessel.
To increase the service lives of the burners, the electrode of the plasma burner and the melting stock charged in the furnace vessel are applied to the auxiliary circuit, with the main circuit switched off, and an auxiliary plasma arc is ignited between the plasma burner and the melting stock, whereupon the plasma burner is moved back from the melting stock, thereby lengthening the auxiliary plasma arc, and subsequently the main circuit is applied to the plasma burner and to the melting stock, and the plasma arc is ignited.

REFERENCES:
patent: 4061493 (1977-06-01), Jaeger
patent: 4518417 (1985-05-01), Lugscheider
patent: 4518419 (1985-05-01), Lugscheider
patent: 4519835 (1985-05-01), Gauvin
patent: 4699653 (1987-10-01), Barcza

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