Electric heating – Metal heating – By arc
Patent
1997-08-14
1998-06-16
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912148, 219 75, 219119, B23K 1000
Patent
active
057674787
ABSTRACT:
An electrode for supporting an arc in a plasma arc torch. The electrode includes a metallic holder having a front end, and a cavity in the front end, the cavity having an enlarged outer end portion. An insert assembly is mounted in the cavity and includes an emissive insert composed of a metallic material having a relatively low work function, a sleeve which substantially surrounds the emissive insert so as to separate the emissive insert from contact with the holder at least at the front end. The sleeve is composed of a metal which is selected from the group consisting of silver, gold, platinum, rhodium, iridium, palladium, nickel, and alloys thereof. The insert assembly further includes an aluminum face plate disposed in the enlarged outer end portion of the cavity and which is exposed at the front end of the metallic holder so as to surround a front portion of the sleeve. Alternatively, the aluminum face plate is eliminated and the front end of the metallic holder directly contacts the emissive insert. The overlay portion of the metallic holder between the front face thereof and the sleeve has a predetermined thickness.
REFERENCES:
patent: 3198932 (1965-08-01), Weatherly
patent: 3930139 (1975-12-01), Bykhovsky et al.
patent: 5023425 (1991-06-01), Severance, Jr.
patent: 5097111 (1992-03-01), Severance, Jr.
patent: 5451739 (1995-09-01), Nemchinsky et al.
American Torch Tip Company
Paschall Mark H.
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