Electric heating – Metal heating – By arc
Patent
1990-05-18
1991-05-07
Paschall, M. H.
Electric heating
Metal heating
By arc
21912148, 2191215, 21912151, 219 7616, B23K 900
Patent
active
050138839
ABSTRACT:
The front face of the nozzle of a plasma spray device has a shallow annular recession therein. The recession is bounded inwardly by an extended portion of the nozzle, outwardly by a ring member and rearwardly by an inner surface. The ring member has therein a plurality of arcuately equally spaced holes directed radially inward toward the inner face, the holes communicating with a source of air. Powder is injected radially into the plasma stream external to the nozzle member proximate the outlet end. The air flow from the holes and entrainment of surrounding atmosphere by the plasma stream drive a toroidal vortex anchored in the recession, the vortex effecting a wiping flow on the nozzle face such as to inhibit powder from depositing on the nozzle face.
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Fuimefreddo Anthony J.
Hacker Martin E.
Hain Gunther
Nerz John E.
Grimes E. T.
Ingham H. S.
Paschall M. H.
The Perkin-Elmer Corporation
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