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Abstract
The article examines the effect of residual welding stress on the crack development in longitudinal welds of a linear part of the main gas pipeline after ten years of operation. It has been revealed that the cracks have formed on the inner side of the pipe wall in the examined longitudinal joints of the gas pipeline with no visible cracks on the outer side. The distribution of the residual stress of the longitudinal welded joint of the pipe is determined using the portable x-ray equipment. It has been established that the tensile residual stress is formed on the inner surface of the pipe at a level close to the yield strength of the base metal. On the outer surface of the pipe near the weld, the level of the residual stress is close to zero values. The revealed distribution of the residual stress of the longitudinal welded joint explains the cause of cracks on the inner side of the pipe wall of the main gas pipeline. The conducted studies confirm the need to control residual welding stress and develop technologies aimed at reducing their influence to increase their reliability.
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