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Title: Effect of residual stress on the integrity of a branch connection
Authors: Law, M
Kirstein, O
Luzin, V
Keywords: Welding
Residual stresses
Neutron diffraction
Issue Date: 1-Aug-2012
Publisher: Elsevier Science Ltd
Citation: Law, M., Kirstein, O., & Luzin, V. (2012). Effect of residual stress on the integrity of a branch connection. International Journal of Pressure Vessels and Piping, 96-97, 24-29. doi:10.1016/j.ijpvp.2012.05.008
Abstract: A new connection to an existing gas pipeline was made by hot-tapping, welding directly onto a pressurised pipeline. The welds were not post-weld heat treated, causing significant residual stresses. The critical weld had residual stresses determined by neutron diffraction using ANSTO's residual stress diffractometer, Kowari. The maximum measured residual stress (290 MPa) was 60% of the yield strength. The magnitudes of errors from a number of sources were estimated. An integrity assessment of the welded branch connection was performed with the measured residual stress values and with residual stress distributions from the BS 7910 and API 579 analysis codes. Analysis using estimates of residual stress from API 579 overestimated the critical crack size. © 2012, Elsevier Ltd.
Gov't Doc #: 4619
ISSN: 0308-0161
Appears in Collections:Journal Articles

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