Silva, Francisco José Gomes daPereira, A. B.Fecheira, J. S.Sousa, V. F. C.2021-05-272020978-1-53618-342-9http://hdl.handle.net/10400.22/17995Friction stir welding is a relatively new joining technology, that has been succefuly applied in the connection of large and complex structures, with considerable progress being made throughout time. The development of this new solid-state welding technique has opened up new possibilities for joining similar and dissimilar materials, allowing the obtention of extremely interesting mechanical properties. This welding technique becomes even more interesting when applied to materials that are traditionally considered difficult to weld by conventional fusion methods. As it is well known, despite the fact that aluminum alloys have a low melting point, these are difficult to weld due, mainly, to their high thermal conductivity, requiring relatively high amounts of energy, wich can interfere with the low melting temperature of the alloys. Thus, numerous studies have been carried out around the Friction Stir Welding (FSW) process in various different alloys, however, given the intensive use of aluminum alloys in the most diverse sectors, these have deserved special attention by the researchers. In this chapter, the welding of different aluminum alloys with different process parameters and their influence on mechanical property of the joints are analyzed. This review intends to describe, in a structured way, the most recent developments around FSW of aluminium alloys, with special attention given to the microstructure and mechanical properties of the joints obtained by this process, as well as the parameters able to achieve the best joint properties.engFriction Stir WeldingSolid-state WeldingAluminum AlloysMechanical PropertiesHardnessTensile StrengthSimulationHeat-treatmentsProbeTilt anglebook part