Authors: Wanjae Kim Kwang Soo Kim Hansang Lee Keunbong Yoo
Publish Date: 2016/04/13
Volume: 30, Issue: 4, Pages: 1773-1779
Abstract
A threedimensional finite element model that can simulate multiple start/stop welding process of 347H austenitic stainless steel boiler tubes was developed to estimate welding residual stress distributions Twodimensional axisymmetric finite element model and threedimensional finite element model that exhibit half symmetry along circumferential direction are also employed for verification purposes Sequentially coupled thermomechanical finite element analyses were carried out using three different models to obtain and compare temperature fields and resulting residual stress fields In addition nodebased temperature heat input method and elementbased body flux heat input method were applied to threedimensional half symmetry model to review the adequacy of heat input model that can best estimate welding residual stress distribution in the tubes Finally welding residual stresses obtained using different models were compared with measured data and it was observed that results using threedimensional finite element model that can take into account welding start/stop effects are in good agreement with those of measured data obtained by the Xray diffraction XRD methodWanjae Kim is a senior research engineer in Korea Electric Power Corporation Research Institute Daejeon South Korea His research interests include developing computational methods and numerical models for power generation systems integrity evaluation and monitoring
Keywords: