Abstract
This paper presents numerical analysis of thermal phenomena in hybrid laser – arc welding. The temperature field was obtained by solving the heat transfer equation with convection term. The fluid flow in the melted zone was determined by the solution of the Navier – Stokes equation taking into account the natural convection and flow through porous medium in the mushy zone. On the basis of elaborated models, the results of computer simulations were presented considering temperature and velocity distribution with marked fusion zone and the heat-affected zone.