Electric heating – Metal heating – By arc
Patent
1985-10-21
1987-07-07
Paschall, M. H.
Electric heating
Metal heating
By arc
219121PT, 2191304, B23K 1500
Patent
active
046788883
ABSTRACT:
An apparatus for starting and maintaining a plasma arc is disclosed, which comprises a plasma arc torch composed of a rear electrode and a front tubular member, with the tubular member acting as a collimator in transfer arc operation or as an electrode in non-transfer arc operation. The power circuit includes a main DC power supply, an electrical pulse generator in series with the plasma torch, and a protective capacitor connected between the main power supply and pulse generator. To initiate the arc, a high voltage pulse is generated by the pulse generator, which has sufficient power to strike an arc which extends from the rear electrode to an external workpiece in the case of transfer arc operation. The main power supply is used only to maintain the established arc, and thus may have a relatively small voltage capacity.
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Camacho David P.
Camacho Salvador L.
Paschall M. H.
Plasma Energy Corporation
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