Electric heating – Metal heating – By arc
Patent
1988-09-08
1989-09-12
Paschall, M. H.
Electric heating
Metal heating
By arc
2191215, 21912148, 219 7616, B23K 904
Patent
active
048662402
ABSTRACT:
Apparatus and method are disclosed for introducing powder into a stream of plasma generated in a plasma torch such as a plasma transferred arc torch.
The nozzle of the torch has a central base through which the stream of plasma flows, the bore being conically flared immediately adjacent the exit end of the nozzle. Powder is fed through feed bores in the nozzle to the conically flared portion of the central bore and is directed in the form of streams of powder toward the plasma streams at angles to the longitudinal axis of the central bore of between about 45.degree. and about 50.degree., preferably 50.degree., with a velocity component in the direction of travel of the plasma stream. The streams of powder are fed sufficiently close to the plasma stream as to avoid spreading of the streams of powder before they reach the plasma stream, but not so close to the plasma stream as would cause plugging of the feed bores in the nozzle.
REFERENCES:
patent: 3591759 (1971-07-01), Stand
patent: 3676638 (1972-07-01), Stand
patent: 3914573 (1975-10-01), Mueblberger
patent: 4506136 (1985-03-01), Smyth et al.
patent: 4672171 (1987-06-01), Cusimano et al.
Paschall M. H.
Schuman Jack
Stoody Deloro Stellite, Inc.
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