TY - JOUR ID - 253349 TI - Residual Stress Assessment in Spiral Steel Pipe with the Grade of API-X65 after Submerged Arc-welding JO - Iranian Journal of Mechanical Engineering Transactions of the ISME JA - JMEE LA - en SN - 1605-9727 AU - Rajabi, M. AU - Hashemi, SH. AD - Corresponding Author, Ph.D., Pipes and Related Industries Research Center, University of Birjand, Birjand, Iran P.O.B. 97175/615 AD - Professor, Department of Mechanical Engineering, University of Birjand, Birjand, Iran, P.O.B. 97175/615 Y1 - 2022 PY - 2022 VL - 23 IS - 1 SP - 5 EP - 29 KW - Residual Stress KW - spiral welded pipe KW - hole drilling technique KW - natural gas transmission pipes KW - API X65 DO - 10.30506/jmee.2022.524861.1253 N2 - In this study, residual stresses in a finite sample separated from the seam-weld of an API pipe with a large diameter were studied for the first time. A finite element simulation of the welding process was conducted to achieve a safe dimension for this sample. After validation of the results, residual stresses were obtained in different directions in this way. Residual stress distribution in the thickness direction represented for the first time is important; firstly, based on standards the accuracy of central-hole-drilling results depends on it. Secondly, this distribution sheds light on the 3D equilibrium of residual stresses. The results show that a finite sample with the size of 320×440 mm separated from the main pipe is appropriate for doing the central-hole-drilling test which is a significant achievement. It is also proved that the maximum value of residual stresses takes place on surfaces of the sample, while the minimum of this figure was reported in the middle of the thickness. This achievement ensures that the maximum and critical values of residual stresses are obtained by the CHD technique. UR - https://jmee.isme.ir/article_253349.html L1 - https://jmee.isme.ir/article_253349_31a6ed4749128c6f0e0c68f95eac3998.pdf ER -