B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/1.3
B23K 26/00 (2006.01) B23K 26/24 (2006.01) H01S 3/00 (2006.01)
Patent
CA 1119257
METHOD OF MATERIAL PROCESSING UTILIZING AN INTERRUPTED BEAM OF CONTINUOUS WAVE LASER RADIATION ABSTRACT OF THE DISCLOSURE 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 radia- tion 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 absorb- ing plasma and the efficient destruction of the reflectivity of the surface of the material results in increased welding efficiency and/or increased welding speed. R-2065pw-m -1-
325739
Swabey Ogilvy Renault
United Technologies Corporation
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