PSI - Issue 30

Mikhail M. Sidorov et al. / Procedia Structural Integrity 30 (2020) 149–153 Mikhail M. Sidorov, Nikolay N. Golikov and Yuriy N. Saraev / Structural Integrity Procedia 00 (2020) 000–000

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Fig. 1. Distribution of axial (1) and circumferential (2) components of residual stresses with distance from the weld axis Z in the girth weld of pipe: (a) at the outer side; (b) at the inner side.

Fig. 2. Redistribution of axial (1) and circumferential (2) components of residual stresses with distance from the weld axis Z in the girth weld of pipe at the inner side after UIT-1:

Fig. 3. Redistribution of axial (1) and circumferential (2) components of residual stresses with distance from the weld axis Z in the girth weld of pipe: (a) at the outer side; (b) at the inner side after UIT-2..

It was found that the UIT of the girth weld of the pipe with a diameter of 530 mm of strength class K60 at a speed of 0.06 m/min can lead to a complete transformation of the tensile residual stresses into compressive ones. The maximum level of compressive residual stresses after treatment reached values of -100... -200 MPa. Also, the results of the study showed that the level of residual stresses at the outer side of the weld were almost