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The combination of distinct materials is a key issue in modern industry, whereas the driving concept is to design parts with the right material in the right place. In this framework, a great deal of attention is directed towards dissimilar welding and joining technologies. In the automotive sector, for instance, the concept of “tailored blanks”, introduced in the last decade, has further highlighted the necessity to weld dissimilar materials. As far as the aeronautic field is concerned, most structures are built combining very different materials and alloys, in order to match lightweight and structural performance requirements. In this framework, the application of fusion welding techniques, namely, tungsten inert gas or laser welding, is quite challenging due to the difference in physical properties, in particular the melting point, between adjoining materials. On the other hand, solid-state welding methods, such as the friction stir welding as well as linear friction welding processes, have already proved to be capable of manufacturing sound Al-Cu, Al-Ti, Al-SS, and Al-Mg joints, to cite but a few. Recently, promising results have also been obtained using hybrid methods. Considering the novelty of the topic, many relevant issues are still open, and many research groups are continuously publishing valuable results. The aim of this book is to finalize the latest contributions on this topic.

n/a --- microstructure --- internal supports --- aging treatment --- Rare earth --- cloud of particles --- joining area --- Al/steel dissimilar materials --- welding-brazing --- dual-beam laser welding --- jet --- tensile --- aluminum-steel butt joint --- crack growth path --- spooling process tape --- lobe curve --- dissimilar metal welded joint --- electrical properties --- filler metals --- EBSD phase mapping --- dissimilar materials welding --- FSW --- mechanical properties --- dissimilar --- tubular joints --- optimal design --- hardness --- AISI 316L --- welding window --- fracture resistance --- tensile resistance --- dissimilar Ti6Al4V/AA6060 lap joint --- arc assisted laser method --- dissimilar metal welding --- dissimilar joints --- pulsed Nd:YAG laser --- solid state welding --- DP1000 steel --- cross-section adjustment --- fracture load --- pulsed Nd:YAG laser beam welding --- aluminum --- interface --- phase potential --- dissimilar weld --- failure mode --- Ag-Cu-Zn --- aluminum alloy --- copper --- intermetallic compounds --- electromagnetic pulse welding --- laser beam welding --- ageing --- dissimilar metals --- steel/aluminum joint --- side-by-side configuration --- friction stir spot welding --- interfacial crack initiation --- laser welding --- spatial beam oscillation --- magnetic pulse welding --- surface activation --- DeltaSpot welding --- tensile properties --- friction stir spot brazing --- friction stir welding --- steel/Al joint --- 1050 aluminum alloy --- local strength mismatch --- Inconel 625