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Modelling of heat transfer and fluid flow in laser welding
Author(s) -
Kotalík Pavel,
Boeck Thomas
Publication year - 2008
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200810623
Subject(s) - supercooling , materials science , heat transfer , welding , mechanics , flow (mathematics) , surface tension , fluid dynamics , weld pool , rotational symmetry , laser beam welding , laser , thermodynamics , metallurgy , optics , arc welding , physics , gas tungsten arc welding
Axisymmetric 2D heat transfer including solid–liquid phase transitions coupled with surface tension driven flow of molten metals is studied numerically for pulsed laser welding. We show that the pulse modulation in time influences the temperature, melting front and flow velocity which, together with the expected undercooling, may explain the fine–grain structure of the resolidified welds that have better strength and, possibly, no cracks inside. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)