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Proceedings Paper

Possible models of hydrodynamical nonstationary phenomena in the processes of laser beam deep penetration into materials
Author(s): Vladimir S. Golubev
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Paper 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.

Paper Details

Date Published: 1 March 1996
PDF: 12 pages
Proc. SPIE 2713, Fifth International Conference on Industrial Lasers and Laser Applications '95, (1 March 1996); doi: 10.1117/12.234193
Show Author Affiliations
Vladimir S. Golubev, Scientific Research Ctr. for Technological Lasers (Russia)

Published in SPIE Proceedings Vol. 2713:
Fifth International Conference on Industrial Lasers and Laser Applications '95
Vladislav Ya. Panchenko; Vladimir S. Golubev, Editor(s)

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