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- W2019167584 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 10<SUP>4</SUP> - 10<SUP>7</SUP> W/cm<SUP>2</SUP> 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." @default.
- W2019167584 created "2016-06-24" @default.
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- W2019167584 date "2000-02-07" @default.
- W2019167584 modified "2023-09-23" @default.
- W2019167584 title "Possible hydrodynamic phenomena in deep-penetration laser channels" @default.
- W2019167584 doi "https://doi.org/10.1117/12.377026" @default.
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