Submersible plasma torch

Electric heating – Metal heating – By arc

Patent

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Details

21912148, 2191215, 21912136, 219119, B23K 900

Patent

active

051030721

ABSTRACT:
The present invention relates to a plasma torch intended for being submerged into a bath of molten metal, such as for example a steel melt. The torch comprises an outer electrode made from a non-consumable material and an inner electrode, where at least the outer electrode is made from a copper pipe having internal channels for circulation of a cooling medium, said copper pipe at least on the outside having a layer of refractory material.
The layer of refractory material has a thickness between 1 and 5 mm and is made from Al.sub.2 O.sub.3 or from ZrO.sub.2 stabilized with 5-25% by weight of MgO and/or Y.sub.2 O.sub.3 or oxides of other rare earth elements.

REFERENCES:
patent: 3811029 (1974-05-01), Averyanov et al.
patent: 3995100 (1976-11-01), Jaeger
patent: 4017672 (1977-04-01), Paton
patent: 4112246 (1978-09-01), Lakomsky et al.
patent: 4133987 (1979-01-01), Lakomsky et al.
patent: 4152532 (1979-05-01), Eguchi et al.
patent: 4710607 (1987-12-01), Wilhelm et al.
patent: 4734551 (1988-03-01), Cheek

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