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In this book, modern trends in testing and simulating heterogeneous welded joints, including multi-scale approaches, resulting in appropriate flaw assessment procedures, are highlighted and discussed. The eleven research papers presented in this book give some overview of recent analytical, numerical, and experimental investigations in the field of yield strength mismatched welded joint behaviour. The papers cover several important issues to more accurately characterise the fracture mechanics behaviour and structural integrity assessments.

welding --- distortion --- stamping --- model --- prediction --- actual stress–strain diagram --- undermatching weld --- martensitic steel --- DIC --- FEM --- welded joint --- finite element method (FEM) --- multiple defects --- stress concentration --- weld metals --- welded joints --- damage mechanics --- finite element analysis --- crack growth --- ductile fracture --- Al7075 --- TC4 --- contact reactive brazing --- Cu deposited --- creep --- C* integral --- mismatched weld --- CT specimen --- yield load --- heterogeneous weld --- numerical analysis --- SE(B) specimen --- metal weld --- strength mismatch --- fracture --- plastic correction factors --- fixture rollers --- J-R resistance curve --- refinery --- piping --- API 5L X80 steel --- nonlinear strength analyses --- cleavage fracture stress --- medium carbon forging steel --- microalloyed steel --- acicular ferrite --- heterogeneous microstructure --- crack-initiation energy --- crack-propagation energy --- fracture toughness