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About

Mitsuo Fujimoto is a pioneering researcher in advanced solid-state joining technologies, with a particular focus on Refill Friction Stir Spot Welding (RFSSW) and its aerospace applications. His work sits at the intersection of materials science and manufacturing engineering, addressing critical challenges in joining lightweight aluminum alloys used in aircraft structures. Fujimoto's most impactful contribution — his 2019 study on RFSSW of surface-treated aerospace aluminum alloys with faying-surface sealant — has garnered 45 citations, reflecting its significance to the aerospace manufacturing community. This work, alongside his earlier foundational research on Refill Friction Spot Joining as a rivet replacement technology (2016), has helped establish RFSSW as a viable alternative to conventional mechanical fastening in aircraft assembly. His research portfolio demonstrates a systematic approach to understanding the technology from multiple angles: evaluating joint strength and heat-affected zones, optimizing weld spacing and edge margins in multi-spot-welded AA7075-T6 panels, and most recently investigating sheet metal distortion resulting from thermomechanical processing. Together, these contributions have meaningfully advanced the practical implementation of solid-state welding in aerospace manufacturing, making Fujimoto a key figure in the field's development.