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Title: Challenges of measuring residual stresses in large girth welded pipe spools by neutron diffraction
Authors: Yao, R
Paradowska, A
Eren, E
Wang, B
Keywords: Residual stress;Neutron diffraction;Girth welded pipe
Issue Date: 2016
Publisher: Materials Research Forum
Citation: International Conference Residual Stresses 2016 – ICRS-10, 2: pp. 575 - 580, (2016)
Abstract: In this paper, welding induced residual stresses in a welded API 5L X65 girth pipe spools are discussed in as-welded and in local post weld heat treated conditions. Stress measurements were carried out non-destructively using the neutron diffraction technique. For such large-scale components residual stress measurements require significant preparation and planning. First of all, a choice of stress free lattice spacing value, discussed extensively, is of great importance for the evaluation of residual strains and stresses correctly. Besides, the use of a virtual instrument (SSCANSS software) can optimize measurements for distorted or undistorted large components with or without complex details. Moreover, the well-planned “window” cut through the thickness greatly reduced measurement time. A number of points were measured across the weld, HAZ and the parent material. Measurement results showed that residual stresses in the as-welded condition was lower than the yield strength of the material, and significant relaxation was also observed in the post weld heat treated samples.
Appears in Collections:Dept of Mechanical and Aerospace Engineering Research Papers

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