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Proceedings Paper

Possible hydrodynamic phenomena in deep-penetration laser channels
Author(s): Vladimir S. Golubev
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Paper Abstract

Some new approaches to hydrodynamic mechanisms of deep penetration laser channels [keyholes (KH)] and of melt surface instabilities are proposed. In particular, a thermocapillary mechanism of KH growth is considered for the case of low-intensity laser beam: it is shown that a number of melt surface micro-instability mechanisms typical for 104 - 107 W/cm2 laser beam intensity range can be excited by the thermocapillary, evaporative-capillary, Kelvin- Helmholtz and Rayleigh-Taylor mechanisms. Besides, some macro instabilities of KH melt surface, namely, the capillary collapse, 'moving shelf' and 'melt squeezing out' are possible under certain conditions. Taking into consideration a possibility of melt surface micro- and macroinstabilities, some integral nonlinear nonstationary mechanisms of penetration laser welding can be imagined. In particular, qualitative estimations of several pulse-periodical relaxational mechanisms of CW laser welding are presented.

Paper Details

Date Published: 7 February 2000
PDF: 10 pages
Proc. SPIE 3888, High-Power Lasers in Manufacturing, (7 February 2000); doi: 10.1117/12.377026
Show Author Affiliations
Vladimir S. Golubev, Scientific Research Ctr. for Technological Lasers (Russia)

Published in SPIE Proceedings Vol. 3888:
High-Power Lasers in Manufacturing
Xiangli Chen; Tomoo Fujioka; Akira Matsunawa, Editor(s)

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