Experimental Investigation of Welding Stresses in MWIC Weldability Test
H. Alipooramirabad, A. Paradowska, R. Ghomashchi, N. Hoye, M. Reiddownload PDF
Abstract. The use of high-strength steels in the manufacture of energy pipelines, coupled with the transition to larger pipe diameters and greater wall thicknesses, has led to an increased potential for cracking including hydrogen assisted cracking of energy pipelines due to higher constraint induced stresses. In the present study, a modified version of the Welding Institute of Canada (MWIC) restraint test was used to simulate the constraint conditions of full-scale girth welds on energy pipelines, allowing the influence of welding process parameters on crack formation to be assessed. MWIC test samples of X70 grade high-strength low alloy pipeline steel were manually welded using two different welding processes, namely shielded metal arc welding (SMAW) and modified short-arc welding (MSAW). Residual strains, and hence stresses, in these samples were analysed quantitatively using neutron diffraction technique. Overall, results indicate that the modified WIC restraint test produces significant residual stresses and so is effective in constraining the root run and in consequence studying the hydrogen assisted cracking of high-strength pipeline steels.
Residual Stress, Neutron Diffraction, HACC, MWIC Weldability, SMAW and MSAW Process
Published online 12/22/2016, 6 pages
Copyright © 2016 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: H. Alipooramirabad, A. Paradowska, R. Ghomashchi, N. Hoye, M. Reid, ‘Experimental Investigation of Welding Stresses in MWIC Weldability Test’, Materials Research Proceedings, Vol. 2, pp 557-562, 2017
The article was published as article 94 of the book Residual Stresses 2016
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
 Kotousov A, Borkowski K, Fletcher L, Ghomashchi R. A model of hydrogen assisted cold cracking in weld metal. 2012 9th International Pipeline Conference: American Society of Mechanical Engineers; 2012. p. 329-334.
 Alipooramirabad H, Kotousov A, Ghomashchi R. Numerical analysis of welding stresses in WIC weldability test. 8th Australasian Congress on Applied Mechanics: ACAM 8. Engineers Australia, 2014.
 Yurioka N, Suzuki H. Hydrogen assisted cracking in C-Mn and low alloy steel weldments. International Materials Reviews. 1990;35:217-249. http://dx.doi.org/10.1179/imr.1918.104.22.168
 Yurioka N, Yamasaki S, Morimoto H. Hydrogen effusion from high strength weld metal. Science and Technology of Welding & Joining. 2005;10:497-502. http://dx.doi.org/10.1179/174329305X46682
 Alipooramirabad H, Paradowska A, Ghomashchi R, kotooussov A, Hoye N. Prediction of welding stresses in WIC test and its application in pipelines. Materials Science and Technology. 2016. p. 1-9.
 Kurji R, Coniglio N. Towards the establishment of weldability test standards for hydrogen-assisted cold cracking. The International Journal of Advanced Manufacturing Technology. 2015;77:1581-1597. http://dx.doi.org/10.1007/s00170-014-6555-3
 Kurji R, Griggs J, Linton V, Barbaro F, Kotooussov A, Gamboa E, Ghomashchi R, Coniglio N. An improved Welding Institute of Canada test for evaluation of high-strength pipeline steel weldability. International Pipeline Technology Conference (06 Oct 2013-09 Oct 2013: Ostend) 2013.
 Alipooramirabad H, Ghomashchi R, Paradowska A, Reid M. Residual stress-Microstructure-mechanical property interrelationships in multipass HSLA steel welds. Journal of Materials Processing Technology. 2016; 231:456-467. http://dx.doi.org/10.1016/j.jmatprotec.2016.01.020
 Alipooramirabad H, Paradowska A, Ghomashchi R, Kotousov A, Reid M. Quantification of residual stresses in multi-pass welds using neutron diffraction. Journal of Materials Processing Technology. 2015;226:40-49. http://dx.doi.org/10.1016/j.jmatprotec.2015.07.002