1 October 1991 Melt dynamics and surface deformation in processing with laser radiation
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Abstract
The basic physical processes of melting with laser radiation are reported. Two- and three- dimensional simulations for the fluid and heat flow in a laser-melted pool are performed, using the nondimensional form of the governing equations. The influence of the dimensionless parameters on the flow field, the temperature distribution, and the melt pool geometry are considered. A finite-difference code with boundary-fitted coordinate system has been developed for the analysis of a two-dimensional laser remelting process, including the dynamic of the free-selfadjusting liquid-air surface. The results show that the surface deformation due to the pressure variation by the thermocapillary flow is small compared to melt depth, but it may be up to 30% of the melt depth if the volume expansion due to the solid-liquid phase transformation is taken into consideration. The numerical results are related to experimental ones from metallography and high-speed photography.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ernst-Wolfgang Kreutz, Norbert Pirch, "Melt dynamics and surface deformation in processing with laser radiation", Proc. SPIE 1502, Industrial and Scientific Uses of High-Power Lasers, (1 October 1991); doi: 10.1117/12.46893; https://doi.org/10.1117/12.46893
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