Electric heating – Metal heating – By arc
Patent
1978-05-08
1979-12-18
Reynolds, Bruce A.
Electric heating
Metal heating
By arc
219121L, 176 1, 3132313, 3151117, B23K 900
Patent
active
041795997
ABSTRACT:
Plasma generation occurs when radiation from a high power, infrared laser is directed to a sufficiently short focal point to produce the irradiance required for producing a plasma or laser-supported combustion wave, with the assistance of external plasma initiation apparatus such as an electrode discharge. The laser beam is directed through a cylindrical or conical chamber to the electrode discharge means. The chamber allows a controlled flow of gas to be introduced into the chamber, flowing in the direction of the laser beam to exhaust at the end of the chamber. A plasma is ignited, using the plasma initiation device and is prevented from propagating up the laser beam by the opposing flow of gas. The position of the plasma along the laser beam axis and the plasma temperature are controlled by the velocity of the gas flow. As the gas velocity is increased, the plasma is forced to retreat into higher intensity regions of the converging laser beam, where it absorbs more energy from the beam thereby reaching higher temperatures.
REFERENCES:
patent: 3756344 (1973-09-01), Daiber et al.
patent: 3872279 (1975-03-01), Fairbairn
patent: 3935504 (1976-02-01), Guillaneux et al.
patent: 4042325 (1977-08-01), Tensmeyer
patent: 4091256 (1978-05-01), Friichtericht
"Experimental Study of a Laser Sustained Air Plasma", pp. 1080-1083 of Amcan Inst. of Physics, 3-1975--by Keefer.
"Cutting and Welding with CO.sub.2 Laser", 9-1969, Metal Forming, pp. 258-260.
Bush Freddie M.
Edelberg Nathan
Gibson Robert P.
Paschall M. H.
Reynolds Bruce A.
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