Electric heating – Metal heating – By arc
Patent
1997-06-11
1999-03-02
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912143, 21912152, 21912148, 31511151, B23K 1000
Patent
active
058774718
ABSTRACT:
A plasma torch assembly for receiving electrical energy from an electrical energy source and generating a plasma in a gas from a gas source includes an induction coil to receive electrical energy from the electrical energy source and provide energy to generate an electromagnetic field for the plasma and a shield assembly to shield against energy from the plasma and transfer energy from the induction coil to the plasma. The shield assembly includes a dielectric cylinder, ceramic encasement lining and a plurality of thin walled tubes arranged in a circular array. The tubes are encased by and partially embedded in an encasement lining made of thermal resistant ceramic material that is molded or potted upon the outside surface of and between the metal tubes. The dielectric cylinder, tightly disposed over the encasement lining, provides a water proof barrier for the tubes and supports the ability to draw a vacuum. A water coolant jacket envelope, discharge isolator and the coil surround the shield assembly.
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Reed, Thomas B.; "Induction-Coupled Plasama Torch", Journal of Applied Physics; vol.32, No. 5, pp. 821-824, May 1961.
Dickman Richard D.
Huhn William A.
Paschall Mark H.
The Regents of the University of California
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