Numerical design of high depth-to-width ratio friction stir welding

[Display omitted] Tools with a high depth-to-width ratio of 0.6 were designed and tested. The thread structure of pin could promote material flow but increase fracture risk. The pins with milling facets were more beneficial to achieve sound joint. The tapered thread tool with triple facets was the o...

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Bibliographic Details
Published in:Journal of materials processing technology 2018-02, Vol.252, p.233-241
Main Authors: Huang, Yongxian, Xie, Yuming, Meng, Xiangchen, Lv, Zongliang, Cao, Jian
Format: Article
Language:English
Subjects:
Al-Mg-Si alloy
Fractures
Friction stir welding
Geometry optimization
Heat affected zone
High depth-to-width ratio
High-throughput screening
Microhardness
Risk
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Summary:[Display omitted] Tools with a high depth-to-width ratio of 0.6 were designed and tested. The thread structure of pin could promote material flow but increase fracture risk. The pins with milling facets were more beneficial to achieve sound joint. The tapered thread tool with triple facets was the optimal structure for high depth-to-width ratio friction stir welding at a rotational speed of 800rpm and a welding speed of 30mm/min. The measured temperature and joint formation agreed with the predicted data well. A narrower average heat affected zone with the width of 440μm was obtained, which was far lower than that underwater friction stir welding.
ISSN:0924-0136
1873-4774
DOI:10.1016/j.jmatprotec.2017.09.029