Finite Element Predictions of Temperature Distributions in a Multipass Welded Piping Branch Junction
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AbstractThis contribution deals with the complex temperature profiles that are generated by the welding process in the intersection region of thick walled, cylinder-cylinder junctions. These affect material microstructure, mechanical properties and residual stresses. Knowledge of the thermal history and temperature distributions are thus critical in developing control schemes for acceptable residual stress distributions to improve in-service component behavior. A comprehensive study of three-dimensional temperature distributions in a stainless steel tee branch junction during a multipass welding process is presented. A newly developed partitioning technique has been used to mesh the complex intersection areas of the welded junction. Various phenomena associated with welding, such as temperature dependent material properties, heat loss by convection and latent heat have been taken into consideration. The temperature distribution at various times after deposition of certain passes and the thermal cycles at various locations are reported. The results obtained in this study will be used for on-going and future analysis of residual stress distributions. The meshing technique and modeling method can also be applied to other curved, multipass welds in complex structures.
CitationJournal of Pressure Vessel Technology, 127(1): 7-12
JournalJournal of Pressure Vessel Technology
DescriptionThis paper has informed industry of the capabilities of advanced simulation to better understand and improve the manufacture of welded joints; in turn, to improve the lifetime and safety of high temperature structures used in the petrochemical and power generation industries. This paper was also presented at the American Society of Mechanical Engineers (ASME) conference in San Diego, USA, and was awarded the best paper prize.