A parametric analysis is described of the steady-state creep stress at a position in the type IV zone of a thick-walled pipe weld. This involves a general multi-material creep formulation, using Norton's power law. A three-material pipe weld model is used to investigate stress variations at the position with different material properties for each material zone. Based on the results obtained, the effect of material mismatch on stress can be identified. The use and accuracy of the parametric analysis method for weld assessment and design is discussed.
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