Electric heating – Metal heating – By arc
Patent
1981-08-14
1984-04-24
Paschall, M. H.
Electric heating
Metal heating
By arc
219121PP, 219121PN, 219121PL, 239 71, 239125, 2391323, B23K 900
Patent
active
044450214
ABSTRACT:
A heavy duty plasma spray gun for extended industrial service is disclosed. The gun includes a gas distribution member made of a material having a coefficient of expansion different from that of the parts surrounding it. The gas distribution member is forcibly urged by a resilient member such as a coiled spring against a seal so as to assure the plasma gas is introduced into the gun arc in a manner only defined by the gas distribution member. The gun has liquid cooling for the nozzle (anode) and the cathode. Double seals are provided between the coolant and the arc region and a vent is provided between the seals which provides an indication when a seal has failed. Some parts of the gun are electrically isolated from others by an intermediate member which is formed as a sandwich of two rigid metal face pieces and an insulator disposed between them. The metal face pieces provide a rigid body to attach the remaining parts in proper alignment therewith.
REFERENCES:
patent: 3130292 (1964-04-01), Gage et al.
patent: 3489876 (1970-01-01), Haase et al.
patent: 3601578 (1971-08-01), Gebel
patent: 4032744 (1977-06-01), Goucher
patent: 4309590 (1982-01-01), Stol
Irons Gary C.
Klein John F.
Lander Richard D.
Thompson Henry C.
Trapani Richard D.
Crane J. D.
Grimes E. T.
Masselle F. L.
Metco Inc.
Paschall M. H.
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