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9 October 2021 Improving fatigue performance of laser-welded 2024-T3 aluminum alloy using dry laser peening
Tomokazu Sano
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Proceedings Volume 11892, Advanced Laser Processing and Manufacturing V; 118920M (2021) https://doi.org/10.1117/12.2601130
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China
Abstract
The purpose of the present study was to verify the effectiveness of dry laser peening (DryLP), which is the peening technique without a sacrificial overlay under atmospheric conditions using femtosecond laser pulses on the mechanical properties such as hardness, residual stress, and fatigue performance of laser-welded 2024 aluminum alloy containing welding defects such as undercuts and blowholes. After DryLP treatment of the laser-welded 2024 aluminum alloy, the softened weld metal recovered to the original hardness of base metal, while residual tensile stress in the weld metal and heat-affected zone changed to compressive stresses. As a result, DryLP treatment improved the fatigue performances of welded specimens with and without the weld reinforcement almost equally.
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Tomokazu Sano "Improving fatigue performance of laser-welded 2024-T3 aluminum alloy using dry laser peening", Proc. SPIE 11892, Advanced Laser Processing and Manufacturing V, 118920M (9 October 2021); https://doi.org/10.1117/12.2601130
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KEYWORDS
Aluminum
Laser welding
Metals
Femtosecond phenomena
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