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This reprint presents the current state of knowledge and the latest advances in the development of microstructure and material properties using modern FSP (Friction Stir Processing) and related technologies such as FSW (Friction Stir Welding). The chapters of this reprint contain valuable results of research on changes in the microstructure and properties of materials caused by the use of the above technologies. Detailed analysis of these results allowed for the formulation of constructive conclusions of scientific and technological importance. The issues described in here present a significant cognitive and application potential and indicate the problems and implementation challenges faced by users of FSP and related technologies.

Technology: general issues --- stir casting --- boron carbide --- silicon carbide --- AA6061 aluminium alloy --- tensile strength --- friction stir welding --- bobbin tool --- AA1050-H14 --- pin geometry --- travel speed --- welding temperature --- mechanical properties --- groove joint design --- gas tungsten arc welding --- 2205 DSS --- friction stir lap welding --- definitive screening design (DSD) --- tensile shear load --- tool penetration depth --- plunge depth --- friction stir deposition --- solid-state additive manufacturing --- AA2011-T6 and AA2011-O --- AA2011 aluminum alloy --- microstructure --- intermetallics --- hardness --- Friction stir spot welding --- low-carbon steel --- brass --- load-carrying capacity --- dissimilar friction stir welding --- tool penetration depth (TPD) --- intermetallic compound (IMC) thickness --- process parameter --- friction stir processing --- 7075 aluminum alloy --- air cooling --- jet cooling nozzle --- microstructure evolution --- tribological properties --- aluminum alloys --- AA6082 --- friction stir spot welding --- n/a

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Welding is widely used by both academia and industry to create similar and dissimilar joints aiming to create a complex shape structure and to couple the mechanical properties of different materials into a single monolithic structure. In this book, a collection of peer-reviewed works on the welding of advanced engineering alloys is presented. Both solid-state and fusion-based welding technologies are presented. These works employed advanced microstructure characterization to evaluate how the selection of process parameters impacts the microstructure and mechanical properties of the welded joints. Moreover, three comprehensive review works are also included, providing an in-depth overview of distinct topics. We hope that this collection of works is of interest to the community so that welding technologies continue to grow further in the future.

Technology: general issues --- History of engineering & technology --- friction stir welding --- dissimilar metals --- temperature --- process conditions --- guidelines --- resistance heat-assisted ultrasonic welding --- mechanical properties --- fracture morphology --- intermetallic compounds --- microstructure --- double-pulsed --- robot operation --- fuzzy comprehensive evaluation --- orthogonal experimental design --- short-circuiting gas metal arc welding --- waveform control method --- weld pool oscillation and flow --- high speed photograph --- image processing --- continuous wavelet transform --- K-TIG --- heat input --- weld formation --- tensile properties --- welding procedure optimisation --- tungsten inert gas welding --- friction stir processing --- dissimilar aluminium alloys joints --- dissimilar metal joints --- welding --- high entropy alloys --- laser welding --- review --- tensile strength --- flexural strength --- dissimilar aluminium alloys --- numerical finite-element modeling --- analytical Rosenthal equation --- thermal regime --- AA5456 --- aluminum alloy --- fiber laser-MIG hybrid --- CMT --- MIG --- hybrid joints --- hardness --- ASTM A553-1 (9% nickel steel) --- penetration shape --- Bead on Plate (BOP) --- pulsed GMAW --- droplet transfer --- weld bead formation --- droplet impact force --- double-pulsed gas metal arc welding (DP-GMAW) --- droplet impingement pressure --- weld pool oscillation --- grain refinement --- constitutional supercooling --- deep neural network --- high strength steel --- laser beam welding --- penetration --- quality assessment --- spectrometer --- welding seam root --- metal flow behavior --- root flaw --- pin length --- Incomplete penetration --- weak connection --- real time --- infrared thermography --- camera --- microhardness --- plasma arc welding --- hot wire --- laser oscillating welding --- high temperature titanium alloy --- laser impact welding --- interfacial bonding mechanism --- interface wave --- diffusion --- TA1/Q235B composite sheets --- rolling temperature --- explosive welding --- microstructures --- dissimilar welding --- aluminum --- fracture --- friction welding --- Ti-6Al-4V --- nitinol --- intermetallic compound --- fractography --- dissimilar metal joining --- dissimilar friction stir welding --- AA2024-T4/AA7075-T6Al alloys --- t-butt joints --- microstructure evaluation --- EBSD --- fracture surfaces --- texture --- investment casting --- alloy 718 --- hot cracking mechanism --- Varestraint test