FIELD: metallurgy.
SUBSTANCE: at connection of steel strips (2) thermal treatment of weld seams is carried out in welding machine with laser welding head (3) by heating weld seam and regions (6, 7) adjacent to weld seam before and behind it by means of multi-stepped linear inductors (4, 5) each having zones of different density of power, having multiple conducting loops of different length, and/or different metal panels at conducting loops and/or various distances of conducting loops relative to steel strip.
EFFECT: reduced crack formation and change of structure in region of weld seam.
15 cl, 7 dwg
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