Community Research and Development Information Service - CORDIS


Non-destructive measurement of welding stresses in structural components remains a challenging task. One out of very few techniques applicable to such problems is the neutron diffraction technique, which is closely related to the well-established X-ray diffraction. Whereas the latter provides for non-destructive measurement of surface stresses only, neutron diffraction enables the engineer to obtain in-depth measurements of residual stress. At the High Flux Reactor (HFR) of the Joint Research Centre (JRC), Petten, a new residual stress diffractometer has been installed capable of handling components up to 100 kg - the Large Component Neutron Diffraction Facility (LCNDF). It has facilitated residual stress measurements in various weldments, including steel piping welds for nuclear applications. In this paper the principles of the technique are outlined and major elements of testing equipment and procedures are presented. Particularities to be taken into account especially in testing of austenitic steel welds are explained. Finally test results obtained on two thick steel nuclear piping welds are presented.

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Authors: OHMS C, European Commission, Joint Research Centre, Institute for Energy, Petten (NL);YOUTSOS A G, European Commission, Joint Research Centre, Institute for Energy, Petten (NL);VAN DER IDSERT P, Energy research Centre of the Netherlands (ECN), Petten (NL)
Bibliographic Reference: An oral report given at: Baltica V International Conference on Condition and Life Management for Power Plants. Organised by: VTT Manufacturing Technology. Held in: Porvoo (FI), 6-8 June 2001.
Record Number: 200214369 / Last updated on: 2002-02-15
Original language: en
Available languages: en