ВЛИЯНИЕ АМПЛИТУДЫ И ЧАСТОТЫ КОЛЕБАНИЙ ПЛАЗМОТРОНА НА ХИМИЧЕСКУЮ И СТРУКТУРНУЮ НЕОДНОРОДНОСТЬ МЕТАЛЛА, НАПЛАВЛЕННОГО ПЛАЗМЕННО-ПОРОШКОВЫМ МЕТОДОМ

Effect of amplitude and frequency of plasmatron oscillation on formation of deposited beads, nature of base metal penetration as well as structural and chemical inhomogeneity in zone of joining of deposited and base metal was investigated. The plasmatron oscillation frequency has the largest effect on bead shape and its microstructure, increase of amplitude rises bead width and decrease of its height. Effect of plasmatron oscillation frequency on nature of base metal penetration and chemical and structural inhomogeneity in zone of joining of base and deposited metals along deposition direction was also investigated. In deposition with plasmatron oscillations there is a wavy configuration of interface of deposited and base metals in longitudinal direction with larger frequency of projections and depressions, which repeats plasmatron oscillation frequency. It is determined that increase of plasmatron oscillation frequency on projections as well as depressions on fusion boundary promotes decrease of deposited and base metals and content of main alloying elements rapidly falls. [ABSTRACT FROM AUTHOR]