FIELD: process engineering.
SUBSTANCE: invention relates to production of steel pipe with the help of laser welding. Welding is executed with the help of multiple laser beams, each having spot diameter of 0.3 mm or more on open pipe upper surface. Multiple laser beams are arranged to make the sum of lengths of spots of multiple beams. Spot lengths extend perpendicular to welding line on steel strip surface to make 0.5 mm or more. Multiple laser beams are arranged so that the spacing between centres of spots in direction of welding line makes up to 5 mm.
EFFECT: production of high-quality steel pipe with high yield owing to prevention of undercutting or insufficient weld filing.
14 cl, 6 dwg, 2 tbl
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