Method of arc control in plasma arc furnace torches

Details Method of arc control in plasma arc furnace torches Method of arc control in plasma arc furnace torches

1974-08-20

1976-09-14

Envall, Jr., R. N.

Electric heating

Microwave heating

Tunnel furnace

219121P, H05H 126

Patent

active

039808025

ABSTRACT:
A plasma arc remelting furnace system with improved components including mechanisms for independently vertically feeding and oscillating the metal blank through the top of the furnace. Multiple plasma arc torches (plasmatrons) are installed in a sealed chamber and adjustable operators enable angular disposition of individual torches. The torches have improved torch nozzles with heat sink construction enabling operation at higher temperatures, better stablized plasma arcs and longer torch life. The system can utilize ingot molds of various cross section shapes, i.e., round, square, rectangular and polygonal and, depending upon mold shape, the number of torches can differ. Operating circuits are provided for use with a plurality of different numbers (up to eight) of torches, either with direct current or alternating current power sources, and possible variations of circuits will enable using a larger number of torches.

REFERENCES:
patent: 2951143 (1960-08-01), Anderson et al.
patent: 3790742 (1974-02-01), Auer

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