Piping branch junctions and nozzle attachments to main pressure vessels are common engineering components used in the power, oil and gas, and shipbuilding industries amongst others. These components are usually fabricated by multipass welding. The latter process is known to induce residual stresses at the fabrication stage, which can have severe adverse effects on the in-service behavior of such critical components. It is thus desirable if the distributions of residual stresses can be predicted well in advance of welding execution. This paper presents a comprehensive study of three dimensional residual stress distributions in a stainless steel tee branch junction during a multipass welding process. A full three dimensional thermomechanical finite element model has been developed for this purpose. A newly developed meshing technique has been used to model the complex intersection areas of the welded junction with all hexahedral elements. Element removal/reactivate technique has been employed to simulate the deposition of filler material. Material, geometry, and boundary nonlinearities associated with welding were all taken into account. The analysis results are presented in the form of stress distributions circumferentially along the weld line on both run and branch pipes as well as at the run and branch cross sections. In general, this computational model is capable of predicting three dimensional through-thickness welding residual stress, which can be valuable for structural integrity assessments of complex welded geometries.
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e-mail: k.yahiaoui@wlv.ac.uk
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November 2007
Research Papers
Finite Element Prediction of Residual Stress Distributions in a Multipass Welded Piping Branch Junction
Wei Jiang,
Wei Jiang
School of Engineering and the Built Environment,
University of Wolverhampton
, Telford Campus, Telford TF2 9NT, United Kingdomw.jiang@wlv.ac.ukand School of Mechanical Engineering,
Dalian University of Technology,
Dalian, 116024, China
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Kadda Yahiaoui
Kadda Yahiaoui
School of Engineering and the Built Environment,
e-mail: k.yahiaoui@wlv.ac.uk
University of Wolverhampton
, Telford Campus, Telford TF2 9NT, United Kingdom
Search for other works by this author on:
Wei Jiang
School of Engineering and the Built Environment,
University of Wolverhampton
, Telford Campus, Telford TF2 9NT, United Kingdomw.jiang@wlv.ac.ukand School of Mechanical Engineering,
Dalian University of Technology,
Dalian, 116024, China
Kadda Yahiaoui
School of Engineering and the Built Environment,
University of Wolverhampton
, Telford Campus, Telford TF2 9NT, United Kingdome-mail: k.yahiaoui@wlv.ac.uk
J. Pressure Vessel Technol. Nov 2007, 129(4): 601-608 (8 pages)
Published Online: September 13, 2006
Article history
Received:
March 24, 2006
Revised:
September 13, 2006
Citation
Jiang, W., and Yahiaoui, K. (September 13, 2006). "Finite Element Prediction of Residual Stress Distributions in a Multipass Welded Piping Branch Junction." ASME. J. Pressure Vessel Technol. November 2007; 129(4): 601–608. https://doi.org/10.1115/1.2767343
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