Abstract
Purpose. Research of the influence of modulation of arc processes on characteristics of clad metal with revealing the dependences of chemical composition and geometrical dimensions of the clad metal on the modulation parameters, as well as the development of mathematical models of these dependences with the purpose of predicting the results of modulation to improve the quality of deposited layers.
 Methods of research. Well-known methods of surfacing metal research were used:
 spectral analysis of metal composition, metallographic analysis of the obtained samples of cross-sections of the cladding rolls. Special computerized programs were used to measure geometric dimensions of the roll. Methods of regression analysis were used in order to obtain generalized mathematical models of dependencies of chemical elements and geometrical dimensions on modulation parameters.
 Results. In the process of research with electric-arc cladding of electrode flux-cored self-shielded wire, generalized results of dependences of carbon, chromium and boron content, width, amplification and penetration of cross-sectional area on the frequency and modulation duty cycle of electric-arc process parameters were obtained. Method of mathematical description of modulation effect on chemical composition and shape of the weld bead was developed.
 Scientific novelty. It was suggested to carry out estimation of the results by applying mathematical models when carrying out the electric arc process with periodic change of power parameters of current surfacing due to controlling the electric drive of the electrode wire feeding mechanism and also with change of voltage when controlling the output voltage of the welding current source. 
 Practical value. A set of studies concerning the effects of modulation of power parameters of the welding process using an original development of the modulator allows, based on relatively simple systems of automatic and mechanized equipmen makes it possible, to obtain a controlled process of influence on the characteristics of the fused metal with their improvement for the implementation in industrial production.
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