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Studies on the weldability of 17-4PH stainless steel, in the 621uC overaged condition, showed that Cr eq /Ni eq ratio higher than 1 . 5 resulted in primary ferritic mode of solidification in the weld metal. Post-weld aging treatment at 482uC enhanced the strength of the weld joint with corresponding reduction in impact toughness of the weld metal while post-weld aging at 621uC caused marginal reduction in strength of the weld joint with significant increase in impact toughness of the weld metal.

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This paper is a research output of DMW-Creep project which is part of a national UK programme through the RCUK Energy programme and India's Department of Atomic Energy. The research is focussed on understanding the characteristics of welded joints between austenitic stainless steel and ferritic steel that are widely used in many nuclear power generating plants and petrochemical industries as well as conventional coal and gas-fired power systems. The members of the DMW-Creep project have undertaken parallel round robin activities measuring the residual stresses generated by a dissimilar metal weld (DMW) between AISI 316L(N) austenitic stainless steel and P91 ferritic-martensitic steel. Electron beam (EB) welding was employed to produce a single bead weld on a plate specimen and an additional smoothing pass (known cosmetic pass) was then introduced using a defocused beam. The welding residual stresses have been measured by five experimental methods including (I) neutron diffraction (ND), (II) X-Ray diffraction (XRD), (III) contour method (CM), (IV) incremental deep hole drilling (iDHD) and (V) incremental centre hole drilling (iCHD). The round robin measurements of weld residual stresses are compared in order to characterise surface and sub-surface residual stresses comprehensively

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