In this paper, detailed weld residual stress analyses are presented for a typical multi-pass girth weld in Type 316L stainless steel pipe with r/t ratio of 25. Advanced finite element procedures were used to simulate the residual stress development under controlled welding conditions associated with weld mock-ups. Both axisymmetric and 3-D special shell element models were used to reveal local residual stress details and global residual stress characteristics in the girth weld. Residual stress measurements using hole-drilling method were conducted for model validation on the laboratory weld mock-up welds. A good agreement between finite element predictions and experimental measurements were obtained. The major findings include: (a) Axial residual stresses within and near the weld area exhibit a strong bending feature across the pipe wall thickness, while the hoop residual stresses showed a much less variation through the wall thickness. (b) Some periodic variation of the residual stresses is present along the pipe circumference near the weld, particularly for the axial residual stress component. Such a variation tends to become more pronounced in thick wall than in thin wall girth welds. A 3-D model is essential to adequately capture such 3-D features in residual stress distributions. (c) A rapid variation in weld residual stresses can be seen at start/stop positions, where a high magnitude of axial residual stresses is present in both tension and compression.
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Residual Stress Analyses of a Multi-Pass Girth Weld: 3-D Special Shell Versus Axisymmetric Models
P. Dong
P. Dong
Center for Welded Structures Research, Battelle, Columbus, OH 43201-2693
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P. Dong
Center for Welded Structures Research, Battelle, Columbus, OH 43201-2693
Contributed by the Pressure Vessels and Piping Division and presented at the Pressure Vessels and Piping Conference, San Diego, California, July 26–30, 1998, of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. Manuscript received by the PVP Division, July 7, 2000; revised manuscript received October 13, 2000. Editor: S. Y. Zamrik.
J. Pressure Vessel Technol. May 2001, 123(2): 207-213 (7 pages)
Published Online: October 13, 2000
Article history
Received:
July 7, 2000
Revised:
October 13, 2000
Citation
Dong, P. (October 13, 2000). "Residual Stress Analyses of a Multi-Pass Girth Weld: 3-D Special Shell Versus Axisymmetric Models ." ASME. J. Pressure Vessel Technol. May 2001; 123(2): 207–213. https://doi.org/10.1115/1.1359527
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