This paper concerns computer analysis of stress states and numerical prediction of the formation of deformations in T-joint welded by a laser beam technique. Numerical analysis of thermomechanical phenomena are carried out in Abaqus / FEA commercial engineering software, which is based on finite element method (FEM). Three dimensional discrete model is created in the design module of Abaqus / CAE. Different inclinations of welding source are assumed with respect to the edges of joined elements. Numerical analysis takes into account changing with temperature thermomechanical properties of welded plate made of austenitic steel. Simulations of complex thermomechanical phenomena in welding process required the implementation of additional numerical subroutine written in Fortran programming language.Mathematical modells of the power distribution of a moving welding source and the position of the source relative to the edges are implemented into numerical subroutine DFLUX. Temperature distribution, stress state and welding deformations are analysed on the basis of numerical simulations of thermomechanical phenomena.Keywords: Numerical modelling, Laser welding, Temperature field, Welding deformations, T-joint
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