Browsing by Author "Kotousov, A"

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    Prediction of welding stresses in WIC test and its application in pipelines
    (Taylor & Francis, 2016-07-20) Alipooramirabad, H; Paradowska, AM; Ghomashchi, R; Kotousov, A; Hoye, N
    In the present study, the Welding Institute of Canada (WIC) restraint test was used to simulate the restraint conditions of full-scale girth welds on energy pipelines to ascertain the influence of welding process parameters on welding stresses. Finite element models are developed, and validated with neutron diffraction measurements, to evaluate the welding stresses for under-matched, matched and over-matched welds. The effects of heat input, wall thickness and variable restraint lengths of WIC sample are systematically investigated. As a practical outcome, this work can help in selection of the appropriate restraint length for WIC tests to simulate the specified stress conditions in the pipeline, and, ultimately, reduce the risk of Hydrogen Assisted Cold Cracking (HACC) in high strength low alloy. © 2021 Informa UK Limited
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    Quantification of residual stresses in multi-pass welds using neutron diffraction
    (Elsevier, 2015-12-01) Alipooramirabad, H; Paradowska, AM; Ghomashchi, R; Kotousov, A; Reid, M
    Neutron diffraction results highlighted the effect of heat input through changes of travel speed and welding sequence (direction) on the residual stresses in multi-pass weldments of high strength low alloy steel. Residual stresses in excess of yield strength were developed in the weld metal and HAZ particularly for the upper-layers of welds which were not affected by the tempering of the subsequent weld layers. The magnitude of the residual stresses was significantly reduced by increasing the heat input. There was no substantial difference in the magnitude of the residual stresses when the direction of weld deposition was varied but the distribution was more uniform. © 2017 Elsevier B.V.