Metal treatment – Compositions – Heat treating
Patent
1976-05-10
1977-07-26
Stallard, W.
Metal treatment
Compositions
Heat treating
266 51, B23K 706
Patent
active
040381080
ABSTRACT:
A method and apparatus for making an instantaneous thermochemical start on the surface of a metal workpiece.
The method resides in the use of laser beam focused to a small spot to bring the ferrous workpiece to ignition temperature in combination with a high intensity oxygen jet to cause the initiation of the thermochemical reaction. The laser beam may impinge the workpiece at a point about 1 cm behind the spot where the oxygen impinges the workpiece surface to a point about 10 cm ahead of such spot. Accordingly, the laser beam may penetrate the high intensity oxygen jet and still cause the thermochemical reaction to start instantaneously.
The apparatus resides in a scarfing machine having a scarfing nozzle, an oxygen spreader nozzle and a laser assembly associated therewith. The oxygen spreader nozzle is mounted so as to provide high intensity oxygen jet on the surface of the workpiece ahead of the scarfing oxygen effluent from the scarfing nozzle. The laser assembly is mounted so that its optical system will direct a laser beam on the surface either ahead or behind the point of impingement of the oxygen jet.
REFERENCES:
patent: 3360398 (1967-12-01), Garibotti
patent: 3597578 (1971-08-01), Sullivan et al.
patent: 3656988 (1972-04-01), Steffen et al.
patent: 3749878 (1973-07-01), Sullivan et al.
patent: 3966503 (1976-06-01), Engel
patent: 3966504 (1976-06-01), Sipek et al.
Adams, M. J., The Use of the CO.sub.2 Laser for Cutting and Welding, Welding Institute Research Bulletin, vol. 9, Sept. 1968.
Sullivan, A. B. J. et al., Gas-Jet Laser Cutting, British Welding Journal, Aug. 1967.
Engel Stephen August
Fuhrhop Ronald Elmer
Lee, Jr. Warrick E.
Stallard W.
Terminello Dominic J.
Union Carbide Corporation
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