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- W3193553265 abstract "Abstract The current investigation of refill friction stir spot welding (refill FSSW) Al alloy to copper primarily involved plunging the tool into bottom copper sheet to achieve both metallurgical and mechanical interfacial bonding. Compared to conventional FSSW and pinless FSSW, weld strength can be significantly improved by using this method. Nevertheless, tool wear is a critical issue during refill FSSW. In this study, defect-free Al/copper dissimilar welds were successfully fabricated using refill FSSW by only plunging the tool into top Al alloy sheet. Overall, two types of continuous and ultra-thin intermetallic compounds (IMCs) layers were identified at the whole Al/copper interface. Also, strong evidence of melting and resolidification was observed in the localized region. The peak temperature obtained at the center of Al/copper interface was 591 °C, and the heating rate reached up to 916 °C/s during the sleeve penetration phase. A softened weld region was produced via refill FSSW process, the hardness profile exhibited a W-shaped appearance along middle thickness of top Al alloy. The weld lap shear load was insensitive to the welding condition, whose scatter was rather small. The fracture path exclusively propagated along the IMCs layer of Cu 9 Al 4 under the external lap shear loadings, both CuAl 2 and Cu 9 Al 4 were detected on the fractured surface on the copper side. This research indicated that acceptable weld strength can be achieved via pure metallurgical joining mechanism, which has significant potential for the industrial applications." @default.
- W3193553265 created "2021-08-30" @default.
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- W3193553265 date "2021-08-19" @default.
- W3193553265 modified "2023-10-06" @default.
- W3193553265 title "Refill Friction Stir Spot Welding Al Alloy to Copper via Pure Metallurgical Joining Mechanism" @default.
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- W3193553265 doi "https://doi.org/10.1186/s10033-021-00593-0" @default.
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