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Metals 2019, 9(3), 286; https://doi.org/10.3390/met9030286

Microstructure and Fracture Behavior of Refill Friction Stir Spot Welded Joints of AA2024 Using a Novel Refill Technique

1
School of Aeronautical Manufacturing and Engineering, Nanchang Hangkong University, Nanchang 330063, China
2
School of Material Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
3
Canmet MATERIALS, Natural Resources Canada, 183 Longwood Road South, Hamilton, ON L8P0A5, Canada
*
Author to whom correspondence should be addressed.
Received: 30 January 2019 / Revised: 26 February 2019 / Accepted: 27 February 2019 / Published: 3 March 2019
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Abstract

Keyhole at the end of a conventional friction stir welded (FSW) joint is one of the major concerns in certain applications. To address this issue, a novel keyhole refilling technique was developed for conventional friction stir spot welding (FSSW) using resistance spot welding (RSW). A three-phase secondary rectifier resistance welder was adapted for the refill of the keyhole in the 1.5 mm + 1.5 mm friction stir spot welded 2024-T4 aluminum alloy joint. The microstructure and tensile shear fracture behavior were compared for both the unfilled and refilled specimens. The results show that the plug and keyhole are dominated by solid state welding with some localized zones by fusion welding. The refill process significantly improved the maximum load capacity in tensile shear testing as the corona ring is enlarged leading to a larger bonding area. Moreover, the tensile shear fracture occurs in the refilled FSSW specimens at the corona bonding zone, while the fracture occurs at the hook zone in the unfilled keyhole. View Full-Text
Keywords: friction stir spot welding; resistance spot welding; keyhole; aluminum alloy friction stir spot welding; resistance spot welding; keyhole; aluminum alloy
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Deng, L.; Li, S.; Ke, L.; Liu, J.; Kang, J. Microstructure and Fracture Behavior of Refill Friction Stir Spot Welded Joints of AA2024 Using a Novel Refill Technique. Metals 2019, 9, 286.

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