Possible hydrodynamic phenomena in deep-penetration laser channels

Vladimir S. Golubev

doi:10.1117/12.377026

7 February 2000 Possible hydrodynamic phenomena in deep-penetration laser channels

Vladimir S. Golubev

Proceedings Volume 3888, High-Power Lasers in Manufacturing; (2000) https://doi.org/10.1117/12.377026
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan

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.

Citation Download Citation

Vladimir S. Golubev "Possible hydrodynamic phenomena in deep-penetration laser channels", Proc. SPIE 3888, High-Power Lasers in Manufacturing, (7 February 2000); https://doi.org/10.1117/12.377026

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