Results of mathematical modelling of absorption of hydrogen and nitrogen by iron during welding are presented. The kinetic model of interaction of a low- temperature plasma with metal, based on the combined solution of equations of mass transfer in gas and metal, has been developed. Comparing calculation results and experimental data shows that the model suggested can adequately describe absorption of two-atomic gases by metal. The process of absorption of gases by the molten pool from the low-temperature plasma has been calculated. The model suggested allowed the effect of the plasma temperature on the concentration of gas dissolved in metal to be evaluated.
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