Technical Physics Letters
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On the initial stage of the evolution of hydrodynamic parameters during deep penetration of metals by high-power laser radiation
Seidgazov R. D.
1, Mirzade F. Kh.
1
1Institute on Laser and Information Technologies—Branch of the Federal Scientific Research Center “Crystallography and Photonics”, Russian Academy of Sciences, Shatura, Moscow region, Russia
Email: seidgazov@mail.ru, fmirzade@rambler.ru
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.
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