In the paper the method of predicting the structural composition and mechanical properties of heat affected zone (HAZ) welded joints using the analytical methods was presented. On the basis of presented phenomenological formulas the computational CCT diagram and corresponding with it phase composition according to cooling rates of S355 steel was created. These values were used to predict the structural composition and mechanical properties of HAZ welded joint. The mechanical properties of HAZ through arising structure in this area and mechanical properties of individual phase components were determined. The predicting of phase composition and mechanical properties of the HAZ was performed for the front of the weld joint carried out with the laser technology. The ABAQUS FEA engineering software was used in order to determine the temperature field. In the calculations, the mathematical model of the volume source welding, based on the distribution of power described by Goldak distribution was applied. On the basis of the temperature distributions in the welded joint, the phase composition and mechanical properties of the HAZ were determined. For the purpose of verification of the results, the experimental studies of the base material investigated steel were performed.Keywords: phase transformations, phase volumetric fraction, heat affected zone, analytical methods, mechanical properties
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