Current Trends and Emerging Strategies in Friction Stir Spot Welding for Lightweight Structures: Innovations in Tool Design, Robotics, and Composite Reinforcement—A Review by Suresh Subramanian, Elango Natarajan, Ali Khalfallah, Gopal Pudhupalayam Muthukutti, Reza Beygi, Borhen Louhichi, Ramesh Sengottuvel, Chun Kit Ang

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