FIELD: process engineering.
SUBSTANCE: invention relates to welding of pipelines. Shell lengthwise grooving for welding is performed at edges of all shells at a time to radius of their curvature. Every shell is located relative to center of shell radius. Grooving is carried out using flame cutters fixed at appropriate head with servo drive composed of roller mechanically coupled with cutter and pressed against shell outer surface in grooving.
EFFECT: higher quality and efficiency.
11 cl, 5 dwg, 1 ex
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