On the initial stage of the evolution of hydrodynamic parameters during deep penetration of metals by high-power laser radiation

R. D. Seidgazov, F. Kh. Mirzade

The Institute on Laser and Information Technologies of the Russian Academy of Sciences, Shatura, Moscow region, Russia

Abstract: A qualitative analysis of changes in hydrodynamic parameters during keyhole formation by thermocapillary melt removal under the point action of CW laser radiation is presented. It is established that rapid surface deformation leads to adhesion of the viscous sublayer to the melting boundary and creation the shear structure of thermocapillary flow which stimulates acceleration of keyhole growth.

Keywords: keyhole formation, laser radiation, thermocapillary effect, shear flow, viscous sublayer, sticking.

Received: 18.06.2022
Revised: 29.07.2022
Accepted: 29.07.2022

DOI: 10.21883/PJTF.2022.18.53394.19283

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