FIELD: technological processes.
SUBSTANCE: pipe blank is produced of a stripe by continuous forming. Electric arc welding of external and internal spiral work seams is performed with flux layer. Weld penetration comprises 60-80% of the pipe wall thickness. Reinforcing bead height H does not exceed the value of H=0.8·δ·K, mm, where δ is the pipe wall thickness in mm; K is an index within the range of 0.45-0.20 in inverse ratio to the pipe wall thickness.
EFFECT: improved internal seam form due to optimised seam weld penetration and reinforcing bead height.
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