FIELD: may be used in welding-on part surfaces; reconditioning the defective or damaged parts, for instance, thrust bearings of above-string girders of railroad cars. SUBSTANCE: device has welding head connected with rotary drive through mechanism of automatic radial motion of head with carrier. This mechanism has body accommodating disk with multiturn spiral groove meshed with head projections on one side, and gear ring being meshed with bevel gear, on the other side. Bevel gear is connected with output shaft of drive of head radial motion mechanism. Welding head is connected with frame for moving in horizontal plane. Welding-on is carried out over spiral in horizontal plane. EFFECT: higher efficiency. 2 dwg
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