Residual stress measurement within a single pass groove weld specimen utilising neutron diffraction and the contour method

Turski, M.; Edwards, L.; James, J.; Bouchard, P. J.; Smith, M. C. and Withers, P. J. (2006). Residual stress measurement within a single pass groove weld specimen utilising neutron diffraction and the contour method. In: ASME 2006 Pressure Vessels and Piping Conference (PVP2006), 23-27 Jul 2006, Vancouver, BC, Canada, American Society of Mechanical Engineers, New York.

DOI: https://doi.org/10.1115/PVP2006-ICPVT-11-93991

Abstract

This paper describes the measurement of longitudinal residual stresses within a specially designed 200×180×25 mm single groove weld specimen. The purpose of these measurements was to quantify the residual stress field arising from a single stringer weld bead laid down within the constraint of a groove in order to validate finite element simulations of the welding process. Measurements were made over the cross section at the mid-bead length, utilising the relatively new Contour method and neutron diffraction. Non destructive neutron diffraction measurements were made using ENGIN-X, the engineering spectrometer at the ISIS facility of the Rutherford Appleton Laboratory (UK). The Contour method measurement was applied destructively at the Open University (UK), producing a detailed full-field residual stress map. Results from these measurements indicate a peak tensile longitudinal residual stress of ~300 MPa within the parent material adjacent to the weld bead. Good agreement is found between both techniques.

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