Electric heating – Metal heating – By arc
Patent
1978-06-12
1979-05-01
Truhe, J. V.
Electric heating
Metal heating
By arc
B23K 900
Patent
active
041525752
ABSTRACT:
A method of material processing, in particular welding, utilizing high frequency interruption of a continuous wave beam of radiation is disclosed. The pulses of laser radiation are generated at a pulse repetition rate more rapid than the thermal response time of the material, typically greater than one kilohertz, wherein the material reacts with the pulses such that the characteristics of the surface reflectivity of the material are dominated by the peak power in the pulse and the characteristics of the melting of the material are controlled by the average power of the pulses. The duration of each pulse is controlled to be less than the time required to generate a beam absorbing plasma adjacent the weld zone. The absence of beam absorbing plasma and the efficient destruction of the reflectivity of the surface of the material results in increased welding efficiency and/or increased welding speed.
REFERENCES:
patent: 3378686 (1968-04-01), Langmuir
patent: 3588440 (1971-06-01), Morse
patent: 3659613 (1972-05-01), Bredemeier
patent: 3824368 (1974-07-01), Locke
patent: 3860784 (1975-01-01), Brown et al.
patent: 4000392 (1976-12-01), Banas et al.
Bell Fred E.
Cavanaugh Lawrence A.
Truhe J. V.
United Technologies Corporation
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