Author(s)

Hamid Suliman Hamid Elhag¹, Nikulin Vasili², Isaac Einav³, Yagoub Kamal Eldin⁴

¹Petroleum Training Center, Khartoum, Sudan.
²Ferrologica Company, St. Petrsburg, Russia.
³Starik Company, Toronto, Canada.
⁴Sudanese Atomic Energy Commission, Khartoum, Sudan.

This research presents an experimental study of analysis of stress strain state SSS of X-60 pipe weld joints employing magnetic anisotropy indicator of mechanical stresses Stress Vision (IMS) using of “before and after” comparison approach taking readings on pipe base metal, weld area and heat affected zone (HAZ) before and after hydrotest. Test results were compared with X-ray testing results for welded joints and with metallographic testing. Test results demonstrate the relevance of applied test conditions and redistribution of residual stresses. A new equation was established for estimating the residual (technological) and operating stresses in other pipelines with a tolerance of 15% in the field of elastic deformation (up to the yield point), according to Hooke law.

Stress Strain State (SSS), Residual Stresses, Stress Concentration, Indicator of Mechanical Stress

Elhag, H. , Vasili, N. , Einav, I. and Eldin, Y. (2016) Analysis of Stress Strain State of X-60 Pipe Weld Joints Employing Magnetic-Anisotropy Indicator of Mechanical Stress. Engineering, 8, 499-508. doi: 10.4236/eng.2016.87046.