METHOD OF WELDING TACK WELDS IN THE PRODUCTION OF WELDED STEEL PIPE OF A LARGER DIAMETER

摘要

FIELD: technological processes.;SUBSTANCE: invention relates to a method of welding with tack welds of a welded steel pipe of large diameter of an open profile. Welding with tack welds is performed continuously on edges (1a) of open pipe (1) during the production of a welded large diameter steel pipe. Welding by tack welds is performed by arc welding with a metal consumable electrode in a shielding gas environment at a welding current of 1,000 A using welding wire (3) of solid cross-section with a diameter of 4.8 mm or more, which is fixed to contact tip (2). During welding, a distance of 25 mm or more is maintained between the outer surface of edges (1a) and the lower end of contact core (2).;EFFECT: method makes it possible to increase the welding speed, excluding uneven welded rolls, burnt and non-welded.;17 cl, 1 dwg, 1 tbl