Method of removing material from a workpiece

Details Method of removing material from a workpiece Method of removing material from a workpiece

1977-10-06

1980-09-02

Reynolds, B. A.

Electric heating

Metal heating

By arc

219121L, B23K 900

Patent

active

042208424

ABSTRACT:
A pulsed infrared laser has an optical system for focusing the laser beam impulse, positioning a metallic workpiece to be drilled at the waist of the beam or at a spacing in the propagation direction in front of the waist of the laser beam, surrounding the portion of the workpiece from which metal is being removed with an atmosphere containing helium and/or hydrogen during the removal process, forming an expanding plasma in front of the portion of the workpiece to be drilled which absorbs the laser radiation at the start of the laser beam impulse by focusing the laser beam impulse at a large aperture angle and dimensioning the timewise intensity course of the laser beam impulse, and maintaining the expanding plasma only during a fraction of the laser beam impulse to remove material from the workpiece.

REFERENCES:
patent: 3473000 (1969-10-01), Siebman et al.
patent: 3485996 (1969-12-01), Chiou et al.
patent: 3710798 (1973-01-01), Bredemier
patent: 4023005 (1977-05-01), Bolin
patent: 4078167 (1978-03-01), Banas et al.
patent: 4122240 (1978-10-01), Banas et al.

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