FIELD: metallurgy.
SUBSTANCE: device comprises source 3 to form heat feed zone 11 on part surface 10, device 5 to feed welding filler 13 into said zone 11 and device 15 to displace heat source 3 and filler feed device 5 relative to part surface 10. Control unit 17 with control program controls displacement so that welding power and heat feed zone diameter are set to ensure cooling rate of at least 8000 K per second at material crystallisation. Depth of remelting previous layer is set proceeding from the condition of formation of polycrystalline weld seam.
EFFECT: rules out cracks.
14 cl, 6 dwg
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