This experiment has important applications in the power generation industry, and is a continuation of two experiments completed at the ILL where we have characterised the triaxial residual stress field of a Friction Taper Stud Weld (FTSW) as a function of process parameters and pre- and post-weld heat treatment by soaking parts in a conventional heat treatment oven. This application will look at post-A typical application for this process would be in situ repair of creep damage in thick walled steam pipes used in power generation, This work will allow for an understanding of how the prescribed heat treatment processes will influence the residual stress field of the FTSW weld region. This understanding will allow for the selecting of process parameters that allow for optimised residual stress field and fatigue properties. This whole area of ¿process and stress engineering¿ is important.