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Science and Technology of Welding and Joining Volume 26, 2021 - Issue 7
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Research Article

Effects of ultrasonic on friction stir Al–Ti welds: a comparative study

Mingrun Yua State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, People’s Republic of China;c Joining and Welding Research Institute, Osaka University, Osaka, JapanCorrespondence[email protected]
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Hongyun Zhaob Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology, Weihai, People’s Republic of ChinaView further author information
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Fei Xub Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology, Weihai, People’s Republic of ChinaView further author information
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Tiejue Chenb Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology, Weihai, People’s Republic of ChinaView further author information
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Li Zhoua State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, People’s Republic of China;b Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology, Weihai, People’s Republic of ChinaView further author information
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Xiaoguo Songa State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, People’s Republic of China;b Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology, Weihai, People’s Republic of ChinaView further author information
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Ninshu Mac Joining and Welding Research Institute, Osaka University, Osaka, JapanView further author information
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Pages 551-558 | Received 31 Jul 2020, Accepted 08 Aug 2021, Published online: 23 Aug 2021
 
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ABSTRACT

Ultrasonic assisted friction stir welding (UaFSW) and conventional friction stir welding (FSW) were conducted on AA6061 and Ti6Al4V alloys. Smaller waves and larger flashes were obtained by UaFSW with 20 kHZ frequency and 10 μm amplitude ultrasonics, and the stir zone was expanded as compared to the FSW one. Interfacial micro-cracks were eliminated with the ultrasonic assistance while a mixed zone was formed beside the Al/Ti interface, containing Ti fragment and intermetallic precipitates. As a mixed zone formed with ultrasonics, the UaFSW weld showed doubled strength in the lap shear tests, as compared to the FSW weld. Cracks propagated in the mixed zone weld of the UaFSW weld, whereas propagated along the Al/Ti interface for the FSW weld.

Acknowledgement

Mingrun Yu acknowledges the support from the China Scholarship Council for the one-year study at the Joining and Welding Research Institute, Osaka University.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by National Natural Science Foundation of China [Grant Number 51974100].

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