FIELD: hardening of surfaces of metal articles by plasma chemical methods. SUBSTANCE: proposed method is performed on plant containing truck placed on rail head and screw-indicator located on sector guide and used for determination of axis of rail head. Guide sector is rotated and plasmatrons are locked at distance from rail head. Then, plasmatrons are moved along rail heat at speed of 80-85 m/h at heating with plasma jet at current intensity of 110-140 A, thus hardening rail head. EFFECT: enhanced efficiency and reliability. 3 cl, 3 dwg
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