Neutron diffraction residual stress measurements on girth-welded 304 stainless steel pipes with weld metal deposited up to half and full pipe wall thickness

R.D. Haigh, M.T. Hutchings, J.A. Games, S. Ganguly, R. Mizuno, K. Ogawa, S. Okido, A.M. Paradowska, Michael E. Fitzpatrick

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Abstract

The residual stress distribution has been measured in two girth-welded austenitic stainless steel pipe weldments using time-of-flight neutron diffraction. One had weld filler metal deposited up to half the pipe wall thickness, and one had weld metal deposited up to full pipe wall thickness. The aim of the work is to evaluate the evolution in residual stress profile on filling the weld, on which there is little experimental data, and where the selection of the correct hardening model used in finite element modelling can benefit greatly from an understanding of the intermediate residual stresses partway through the welding operation. The measured residual stresses are compared with those calculated by finite element modelling and measured using X-ray diffraction. The results show a change in the measured hoop stress at the weld toe from tension to compression between the half- and fully-filled weld. The finite element results show an overprediction of the residual stress, which may be a consequence of the simple isotropic hardening model applied. The results have implications for the likely occurrence of stress corrosion cracking in this important type of pipe-to-pipe weldment.
Original languageEnglish
Pages (from-to)1-11
JournalInternational Journal of Pressure Vessels and Piping
Volume101
Issue numberJanuary 2013
DOIs
Publication statusPublished - Jan 2013

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Bibliographical note

This paper is available on the Open University repository at: http://oro.open.ac.uk/35760/1/1-s2.0-S0142112312002800-main.pdf

Keywords

  • Residual stress
  • Girth welding
  • Neutron diffraction
  • Finite element modelling

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