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ABSTRACT
The results of the investigation of mathematical modelling of the process of alloying deposited metal with varying chemical composition during surfacing with two melting electrodes are given. The results allowed us to estimate the effect of changing the feed speed of the alloying electrode on the change of the alloying element content at the ascending and descending branches of the transition sections from the initial concentration to the desired. It’s shown that the symmetrical changes of alloying element content at both branches can be achieved if the descending branch of transition section consists of two parts with different gradient of feed speed determined by the results of the simulation. It allows the determination of the formation conditions of the surface layer containing consecutively alternating macro heterogeneous areas during the continuous process of hard facing the rolling rolls.