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Area of investigation was powder losses in plasma-powder surfacing using plasmatrons with internal and external schemes of its feeding into arc. Dependence of powder losses on its fraction, geometry of deposited bead and surfacing efficiency was shown. It is determined that losses of powder from steel 10Kh18N10T are 4—5 times lower at internal scheme of feeding, due to its more effective heating in the arc than at external one and do not exceed 1—2 % under favorable conditions. Practical recommendations on efficient application of plasmatrons with different systems of powder feeding are given. 4 Ref., 1 Table, 6 Figures.

Effect of scheme of powder feeding into arc on its losses and efficiency of plasma-powder surfacing process