Comparative neutron and X-ray residual stress measurements on Al-2219 welded plate

A comparison between neuton data obtained on a welded Al alloy (AA2219) for the spacecraft industry at the ISIS spallation source, Chilton, Didcot, UK, and X-ray data collected at the HMI, Xl facility, Berlin, Germany, is presented. For neutron measurements, the time-of-flight (TOF) technique was exploited, leading to lattice parameter a via a Pawley-Rietveld refinement. A three-directional strain scan across the weld was done. For X-ray investigation, both texture and residual stress psi-mode scan analyses were carried out, the latter onto the front, back and side faces of the sample. Cr radiation for the 〈311〉 the Cu radiation for the 〈422〉 peaks were used. Results show a good agreement with previous works on the subject. The complementarity of the two sets of measurements is the underlined. Only together they do allow near-surface and bulk welding stresses to be combined in order to assess the whole stress field and its causes in the sample.