**7. Conclusion**

The proposed model for determining temperature field allows to obtain characteristic zones of the weld joint with shapes and dimensions similar to the real ones. Metallographic verifi‐ cation of the results of numerical simulation of phase transitions also provided satisfactory results.

Analysis of phase transformations occurring during the welding process allowed determina‐ tion of the quantitative composition of the cooling structures in the weld area (in the heataffected zone).

This approach allows for an accurate tracking of changes in phase participations and the course of thermal and phase strains, which enable to determine, within the framework of thermo‐ plasticity theory, welding stresses temporary and residual welding stresses.
