METHOD OF PRODUCTION WELDED LONGITUDINAL PIPES WITH DIAMETER OF FROM 10 TO 530 mm ON CONTINUOUS ELECTRIC PIPE WELDERS Russian patent published in 2019 - IPC B21C37/06 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to the production of welded longitudinal pipes with a diameter of from 10 to 530 mm on continuous electric pipe welders. Method includes preparing the original billet, forming a metal strip in the group of stands with an open caliber profile, compressing the tube billet in a group of stands with a closed caliber profile, the compression of the workpiece in constricting rolls in the process of welding the edges and reduction in the calibration group stands. Reduction of the expenditure ratio of the metal is ensured by the fact that the amount of compression of the tubular billet in the group of stands with a closed caliber is set to 0.6 %, the width of the original billet B is determined taking into account the increase in the perimeter of the billet in the group of stands with an open gauge profile, depending on the type of shaping scheme used in accordance with the proposed mathematical dependence.

EFFECT: reduction of the expenditure ratio of the metal is provided.

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