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Melt dynamics in surface processing with laser radiation

: Pirch, N.; Kreutz, E.W.; Möller, L.; Gasser, A.; Wissenbach, K.

Bergmann, H.W.; Kupfer, R. ; Arbeitsgemeinschaft Wärmebehandlung und Werkstofftechnik e.V. -AWT-:
Laser beam hardening. ECLAT '90. Proceedings
Witzmannsberg: EMS Europ. Media Service, 1990
European Conference on Laser Treatment of Materials (ECLAT) <3, 1990, Erlangen>
Fraunhofer ILT ()
2D; 3D; heat transport; melt dynamics; photomatter interaction; power density distribution; processing parameters; radiation; shielding gas

The basic physical processes of melting with laser radiation are reported especially including the free self-adjusting surface. A three dimensional stationary model for the thermocapillary flow is outlined giving indication for five independent dimensionless parameters. The numerical results show that above a critical scanning velocity the intermixing in the molten pool is completely suppressed. A two-dimensional nonstationary model in a plane parallel to the scanning velocity is reported in order to investigate the surface deformation during surface melting. The calculated surface deformation shows excellent agreement with experimental results performed with a line source power density distribution.