Influence of Heat Input on Microstructure and Mechanical Properties of AA2A12 and AA7075 FSW Joints with their Temperature Field Model

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• Mechanical properties improve with optimized heat input levels, especially in AA7075 joints.
• Significant changes in microstructure were observed with varying heat inputs across samples.
• Analysis of friction stir welding indicated intricate relationships between temperature and joint quality.
• These findings highlight the need for precise control of heat input to achieve desired mechanical qualities.