Repair welds are usually introduced into structures either to remedy initial fabrication defects in castings or welds, or to rectify in-service degradation of components and thereby extend their life and economic operation. There is a strong desire in the aeroengine industry to maximise the useful life of components, and repair strategies are becoming an increasingly common to increase the service life of aeroengine components. This work will form part of a project to develop a validated numerical modelling methodology that can be applied to the weld repair of aeroengine components, allowing parametric investigations to be carried out and optimum repair strategies to be determined. The objective of this proposal is to measure the residual stresses in two IN718 thick plates subjected to an initial weld pass and a repair respectively to allow the validation of the model.