Electric heating – Metal heating – By arc
Patent
1988-01-06
1989-07-11
Paschall, M. H.
Electric heating
Metal heating
By arc
219123, 21912152, 2191215, 219 75, 31323141, 31511121, 31511141, B23K 900
Patent
active
048474665
ABSTRACT:
The invention concerns plasma torches comprising an upstream electrode (12), a downstream electrode (11), a chamber (15) for the injection of plasma producing gas, a priming electrode (13) and optionally a magnetic field coil (14), in which the upstream root of the arc is displaced on the upstream electrode. According to the invention, in order to control a continuous or reciprocating and/or an oscillatory translation, the field coil is supplied with a variable direct current, if need be a pulsatory undulatory current, and/or a diffuser is placed at the inner end of the upstream electrode which is supplied with a modulated flow of gas which it causes to whirl. Application in high power plasma torches for regularizing and rendering uniform the wear of the electrodes so as to prolong the life thereof.
REFERENCES:
patent: 3360682 (1967-12-01), Moore
patent: 4095085 (1978-06-01), Tomita et al.
patent: 4127760 (1978-11-01), Meyer et al.
patent: 4219726 (1980-08-01), Meyer et al.
patent: 4266113 (1981-05-01), Denton et al.
patent: 4543470 (1985-09-01), Santen et al.
patent: 4683367 (1987-07-01), Drouef
Labrot Maxime
Pasquini Pierre
Pineau Didier
Serrano Jean-Pierre
Aerospatiale - Societe Nationale Industrielle
Electricite de France--Service National
Paschall M. H.
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