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William R. Longhurst is a prominent researcher specializing in friction stir welding (FSW), with particular expertise in process automation, force control, and robotic implementation of this innovative solid-state joining technology. His work has significantly advanced the understanding and practical application of FSW, a process that joins materials by using a rotating tool to plastically deform and forge parent materials together without reaching melting temperatures. Longhurst's most influential contribution, "Friction Stir Welding: Process, Automation, and Control" (2013), has garnered an impressive 506 citations, establishing him as a leading authority in the field. His research trajectory reveals a systematic effort to make FSW more precise and industrially viable, progressing from foundational investigations of force-controlled welding to sophisticated torque and traverse speed control methodologies. His 2010 work on torque control (83 citations) and his studies enabling robotic FSW implementation have been particularly impactful in bridging laboratory research with real-world manufacturing applications. Beyond traditional machinery, Longhurst has explored cost-effective solutions for industrial automation, including exploiting robotic link deflection for low-cost force measurement. His cumulative body of work has transformed FSW from a manually intensive process into one amenable to precise, automated control, making him an essential reference for engineers and researchers pursuing advanced manufacturing technologies.