Possible models of hydrodynamical nonstationary phenomena in the processes of laser beam deep penetration into materials

Vladimir S. Golubev

doi:10.1117/12.234193

1 March 1996 Possible models of hydrodynamic nonstationary phenomena in the processes of laser beam deep penetration into materials

Vladimir S. Golubev

Author Affiliations +

Proceedings Volume 2713, Fifth International Conference on Industrial Lasers and Laser Applications '95; (1996) https://doi.org/10.1117/12.234193
Event: Fifth International Conference on Industrial Laser and Laser Applications '95, 1995, Shatura, Moscow, Russian Federation

Abstract

Some possible qualitative models of nonstationary hydrodynamical phenomena in the melt surrounding the 'key-hole' in processes of laser beam or hole punching are presented. Different mechanisms of excitation of such nonstationarities are discussed: thermocapillary, evaporative and 'wind' instabilities of the surface of the melt; a 'shelf' instability of melt layers subjected to the action of intense laser irradiation. Estimations of the laser beam intensity value I and processing velocity v, representing the limits of different mechanisms of instabilities, are presented. The ranges of these two parameters are: I equals 10⁴ - 10⁷ W/cm²; v equals 10^-1 - 10² cm/s. These estimations give some preliminary ideas concerning the choice of (I,v) range, which enables it to provide the stability and quality of deep penetration laser materials processing.

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Vladimir S. Golubev "Possible models of hydrodynamic nonstationary phenomena in the processes of laser beam deep penetration into materials", Proc. SPIE 2713, Fifth International Conference on Industrial Lasers and Laser Applications '95, (1 March 1996); https://doi.org/10.1117/12.234193

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