Arc plasma torch having tapered-bore electrode

Details Arc plasma torch having tapered-bore electrode Arc plasma torch having tapered-bore electrode

1992-01-30

1993-08-24

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912151, 21912159, 219119, B23K 900

Patent

active

052391620

ABSTRACT:
An arc plasma torch having a tapered-bore electrode provides a long, columnar plasma arc. The torch includes a torch housing, a tapered-bore electrode, a gas-constricting nozzle, and a swirling gas flow generator.
The electrode is mounted within the housing and has a closed inner end and an open outer mouth. The electrode has a longitudinally extending, tapered bore. The bore has its largest dimension at the mouth. The nozzle has a bore and is also mounted within the housing. The nozzle is in axial alignment with, forwardly spaced with respect to and insulated from, the tapered-bore electrode. The torch introduces a swirling flow of gas at a location intermediate the electrode and the gas-constricting nozzle, resulting in gas flowing past the electrode during use of the torch. In operation, an electric arc emanating from the electrode ionizes the gas flow.

REFERENCES:
patent: 2379187 (1945-06-01), Richards
patent: 3471675 (1969-10-01), Sargent et al.
patent: 3780259 (1973-12-01), Meyer
patent: 4002878 (1977-11-01), Disney
patent: 4549065 (1985-10-01), Camacho et al.
patent: 4891490 (1990-01-01), Labrot et al.
patent: 4924059 (1990-05-01), Rotolico et al.

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