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Analysis of friction stir welds using thermocouple measurements

Abstract The friction stir welding process is analysed via an inverse problem approach, using experimentally obtained thermocouple information to constrain the thermal field of the model. Using this approach, the thermal field is described by a convenient parametric representation, which is constrained in a self-consistent manner according to data from the outer regions of the weld (e.g. the heat affected zone). The thermal field is scaled using thermocouple measurements acquired during friction stir welding, and is then compared with the thermocouple measurements acquired at different locations. Various aspects of this inverse problem approach relevant to its application to friction stir welds using thermocouple measurements are discussed.