PSI - Issue 30

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2020) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 30 (2020) 28–32

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors 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. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors Keywords: Longitudinal weld of the pipe, Residual welding stress, crack, Gas pipeline, X-ray method 1. Introduction The formation of residual welding stress (RWS) in welded joints is one of the features of the welding process. The studies of Ueda et al. (2012), Bozic et al. (2018), Terada (2005) show that tensile RWS has a significant effect IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Effect of Residual Stress on Crack Development in Longitudinal Welded Joints of a Gas Pipeline Nikolay I. Golikov* Larionov Institute of Physical-Technical Problems of the North SB RAS, 1, Oktyabrskaya St., Yakutsk, 677980, Russia Abstract

* Corresponding author. Tel.: +7-411-235-8869. E-mail address: n.i.golikov@mail.ru

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open-access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of the EURASTRENCOLD - 2020 guest editors

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors 10.1016/j.prostr.2020.12.006