The physical-chemical model describing the formation of nonmetal inclusions in welded metal of mild and low alloyed steels was developed. Thermomechanical calculations of reactions, which took place in a welding pool and determined the structure of nonmetal inclusions, were fulfilled. On a basis of the simulation the hypothesis about two stages formation of the inclusions was put forward. The first stage was in liquid metal during the period before pool crystallization, while the second being in the zone of a solid-liquid phase, which existed some time around the inclusions in a post crystallization period. The mathematical device for numerical estimation of the chemical composition of nonmetal inclusions in each stage of their formation was created. The algorithm for the numerical simulation of the content of oxygen in a nonmetal phase both in before crystallization period and in a post crystallization one was elaborated, as well as the algorithm of calculating the chemical composition of a nonmetal phase, which was condensed on a surface refractory oxides as on a substrate in a biphase zone.
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V.V. et al. (2021) studied this question.