Electric heating – Metal heating – By arc
Patent
1992-01-06
1993-05-04
Albritton, C. L.
Electric heating
Metal heating
By arc
21912173, 21912174, 21912182, B23K 2600
Patent
active
052084345
ABSTRACT:
A laser beam heat treatment for a metal wire has improved incidence and processing conditions so as to achieve efficient surface heat treatment with a circumferentially averaged laser beam flux and with remarkably enhanced fatigue strength in a high speed heat treatment. The method and apparatus is characterized by forming a cone shaped mirror of circular or polygon cross section having a peak angle in a range of 5.degree. to 20.degree. and interior mirror surface, the cone shaped mirror defining an opening having a diameter greater than the diameter of the metal wire in a range of 0.2 to 2 mm, feeding the metal wire having a diameter less than or equal to 1 mm through the cone shaped mirror along the center axis thereof, irradiating a laser beam with an incident angle including an angular deflection with respect to the center axis of the cone shaped mirror in a range of .+-.10.degree. resulting in multiple reflection of the laser beam between the interior mirror surface and the surface of the fed metal wire.
REFERENCES:
patent: 4135902 (1979-01-01), Oehrle
patent: 4151014 (1979-04-01), Charschan et al.
patent: 4456811 (1984-06-01), Hella et al.
patent: 4534811 (1985-08-01), Ainslie et al.
Kido Motoi
Minamida Katsuhiro
Albritton C. L.
Nippon Steel Corporation
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