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Effects of Welding Processes and Post-Weld Aging Treatment on Fatigue Behavior of AA2219 Aluminium Alloy Joints

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Abstract

AA2219 aluminium alloy square butt joints without filler metal addition were fabricated using gas tungsten arc welding (GTAW), electron beam welding (EBW), and friction stir welding (FSW) processes. The fabricated joints were post-weld aged at 175 °C for 12 h. The effect of three welding processes and post-weld aging (PWA) treatment on the fatigue properties is reported. Transverse tensile properties of the welded joints were evaluated. Microstructure analysis was also carried out using optical and electron microscopes. It was found that the post-weld aged FSW joints showed superior fatigue performance compared to EBW and GTAW joints. This was mainly due to the formation of very fine, dynamically recrystallized grains and uniform distribution of fine precipitates in the weld region.

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Acknowledgments

The authors wish to record their sincere thanks to the Aeronautical Research & Development Board (ARDB), New Delhi for the financial support to carry out this investigation under R&D project No. DARO/08/1061356/M1. The authors are grateful to Mr. N. Viswanathan, the retired scientist of the Defence Research & Development Laboratory (DRDL), Hyderabad for providing the EBW facility to carry out this investigation.

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  1. Centre for Materials Joining & Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar (P.O), 608 002, India

    S. Malarvizhi & V. Balasubramanian

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  1. S. Malarvizhi
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  2. V. Balasubramanian
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Correspondence to V. Balasubramanian.

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Malarvizhi, S., Balasubramanian, V. Effects of Welding Processes and Post-Weld Aging Treatment on Fatigue Behavior of AA2219 Aluminium Alloy Joints. J. of Materi Eng and Perform 20, 359–367 (2011). https://doi.org/10.1007/s11665-010-9682-5

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  • DOI: https://doi.org/10.1007/s11665-010-9682-5

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