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Meeting 2025 TMS Annual Meeting & Exhibition
Symposium Mechanical Behavior Related to Interface Physics IV
Presentation Title Influence of Local Melting on the Strength of 316L/7075 Dissimilar Metal Bonding Interface in Ultrasonic Spot Welding
Author(s) Jhe-Yu Lin, Hsiang-Yu Chiu
On-Site Speaker (Planned) Jhe-Yu Lin
Abstract Scope This study elucidated the formation of approximately 1-μm precipitate layers of Al18Mg3Cr2 and Al6(Cu, Fe) during the ultrasonic welding of 316L steel and 7075 aluminum alloy. These precipitate layers formed at interfacial temperatures exceeding 470°C, occurring at approximately 1-2 um away from the steel/Al interface. The continuous formation of these layers was attributed to localized melting, which led to strength saturation of the weld at 2.75 kN.
Proceedings Inclusion? Planned:
Keywords Process Technology, Joining, Aluminum

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