Plasma burner and method of operation

Details Plasma burner and method of operation Plasma burner and method of operation

1984-07-31

1986-04-01

Paschall, M. H.

Electric heating

Metal heating

By arc

219121PM, 219121PP, 219121PR, B23K 900

Patent

active

045800316

ABSTRACT:
Plasma burner having a frontal face from which a plasma jet is to be projected, for producing a long initial firing arc, having first and second concentrically arranged electrodes extending perpendicularly to the frontal face, and a nozzle surrounding the electrodes, the first electrode being centrally arranged to constitute an auxiliary electrode and having a cylindrical main portion, an electrode tip at its front end and a conically tapered portion located between the main portion and the electrode tip and tapering toward the electrode tip, the second electrode being annular and surrounding the first electrode to constitute a nozzle electrode, and having a central channel composed, successively, in the direction toward the frontal face, of a first cylindrical section, a conically tapered section and a second cylindrical section smaller in diameter than the first cylindrical section, the central channel and the first electrode together forming an annular channel. The diameter of the first cylindrical section is 1.2 to 2.5 times the diameter of the cylindrical portion. The tapered portion and the tapered section each have a cone angle of 20.degree. to 80.degree.. The distance between the electrode tip and the plane of the transition between the conically tapered section and the second cylindrical section of the central channel, taken with reference to the direction in which the conically tapered portion tapers is such that the ratio of that distance to the diameter of the second cylindrical section is between -1 and +2.

REFERENCES:
patent: 4389559 (1983-06-01), Rotolico et al.
Elektrowarme International [Electro Heat International] (German Magazine), vol. 30, No. 3, Jun. 1972, pp. 141-156.
DVS-Berichte [DVS Reports], vol. 8, Dusseldorf, FRG, published by Deutscher Verlag fur Schweisstechnik (DVS) GmbH, 1970.
Journal of Metals, Dec. 1962, pp. 907-911.

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