Method of material processing utilizing an interrupted beam of continuous wave laser radiation
Patent 4152575 Issued on May 1, 1979. Estimated Expiration Date: 
June 12, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 12, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3378686 3588440 3659613 3824368 3860784 Fusion zone purification by controlled laser welding Patent #: 4000392 InventorApplicationNo. 05/915085 filed on 06/12/1978US Classes:219/121.64, Methods219/121.61, Beam energy control219/121.73ShapingExaminersPrimary: Truhe, J. V.Assistant: Bell, Fred E. Attorney, Agent or FirmInternational ClassesB23K 26/00 (20060101)B23K 26/24 (20060101) H01S 3/00 (20060101) AbstractA 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. | |
