Electric heating – Metal heating – By arc
Patent
1975-08-01
1977-11-15
Bartis, A.
Electric heating
Metal heating
By arc
23273SP, 156620, 219121L, 219349, 264 25, 350299, 362346, B23K 2800, F21V 700, B01J 1708, G02B 510
Patent
active
040586995
ABSTRACT:
A heating zone of accurately controlled length and predetermined energy profile throughout its length is formed within a focusing apparatus. An elliptical cavity is provided having a conically-configured reflector positioned such that its longitudinal axis coincides with one of the focal axes of the elliptical cavity. An elongate body is placed within the cavity such that its longitudinal axis coincides with the other focal axis. When a beam of radiant energy within a wavelength range which couples with the body to heat it, e.g., a laser beam, is directed onto the conically-configured reflector it is concentrated uniformly around the body throughout a predetermined length. The energy profile along the zone length may be varied either by adjusting the energy distribution in the energy beam prior to being reflected, by modifying the surface contour of the reflector, by modifying the contour of the walls defining the elliptical cavity or by a combination of two or more of these techniques. A plurality of overlapping elliptical cavities may be arranged to have one common axes along which the reflector is positioned and a plurality of axes along which a plurality of elongate bodies are positioned. The apparatus of this invention is particularly suited for heating rods and tubes and, if desired, for use within a controlled atmosphere.
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Arthur D. Little Inc.
Bartis A.
Lepper Bessie A.
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