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Investigation results on the arc plasmatorch for water-steam heating are presented. The construction arrangement of steam plasma generator with copper electrodes of the stepped geometry was firstly implemented. The energy characteristics of plasmatorch and erosion of electrodes reflect the features of their behavior at arc glow in the plasma-forming environment of steam. The results of numerical study of the thermal state of the composite copper-steel electrodes had a significant influence on optimization of anode water-cooling aimed at improvement of its operation life.

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In the article the combined influence of surface effect, proximity effect, ring effect and slot effect on active and self-inductive resistances of the inductor, placed inside the hollow cylindrical workpiece, are investigated. It had been shown that the combined influence of these effects forms a distribution of current over cross-section of the inductor tube. That current determines the values of active and self-inductive resistances of the inductor. There had been presented dependencies of relative coefficients of active and self-inductive resistances of the inductor and relative geometrical parameters of the system "inductor – hollow finite-sized workpiece", the gap between the inductor and the workpiece, and specific resistance of heated nonmagnetic workpiece in presence and absence of internal magnetic core.