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论文类型：期刊论文

发表时间：2012-07-01

发表刊物：INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING

收录刊物：SCIE、EI、Scopus

卷号：95

页面范围：39-47

ISSN号：0308-0161

关键字：Welding sequence; Residual stress; Multipass welding; Piping branch junction

摘要：This paper presents a validated three-dimensional thermomechanical model to investigate the effect of the welding sequence on weld induced residual stress distributions in a multipass welded piping branch junction. Three possible symmetrical welding sequences, i.e. one-welder, two-welder and four-welder sequence, which were expected to generate the least adverse stress distributions in actual welding circumstances, were proposed and evaluated. It is shown that the variations of the predicted maximum stresses along the fusion lines are not large for the three proposed welding sequences, although at both the branch and run cross section, the four-welder model predicts the highest peak residual stresses while the one-welder model gives the lowest values. As would be expected, the stress distributions predicted by the four-welder and two-welder models show more symmetrical features than those by the one-welder model. High residual stress is formed in the vicinity of the weld region irrespective of the sequence of the welding. (c) 2012 Elsevier Ltd. All rights reserved.