FIELD: metallurgy.
SUBSTANCE: method is implemented as additional operation introduction means - application of a working root weld of minimum width and with maximum penetration of root faces. When performing the working root weld, a process weld that was welded before it is fully rewelded. After that, internal and external working welds covering the root weld on both sides are applied.
EFFECT: enhancing a pipe manufacturing process, reducing welding heat input, decreasing the heat effected zone for parent metal, improving mechanical properties of weld metal and heat affected zone, reducing level of residual stresses, and improving geometry of the pipe and weld shape.
4 dwg
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