Improving weld formability by a novel dual-rotation bobbin tool friction stir welding

被引：52
作者：
Wang, F. F. [1 ,2 ,3 ]
Li, W. Y. [1 ]
Shen, J. [2 ]
Wen, Q. [1 ]
dos Santos, J. F. [2 ]
机构：
[1] Northwestern Polytech Univ, Shaanxi Key Lab Frict Welding Technol, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
[2] Helmholtz Zentrum Geesthacht, Inst Mat Res, Mat Mech, D-21502 Geesthacht, Germany
[3] China Acad Launch Vehicle Technol, Beijing Inst Astronaut Syst Engn, Beijing 100076, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2018年 / 34卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Bobbin tool friction stir welding; Dual rotation; Material flow; Microstructure; Microhardness; AL-LI ALLOY; MECHANICAL-PROPERTIES; ALUMINUM-ALLOY; MATRIX COMPOSITES; MICROSTRUCTURE; SPEED; FLOW;
D O I：
10.1016/j.jmst.2017.11.001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A novel dual-rotation bobbin tool friction stir welding (DBT-FSW) was developed, in which the upper shoulder (US) and lower shoulder (LS) have different rotational speeds. This process was tried to weld 3.2 mm thick aluminum-lithium alloy sheets. The metallographic analysis and torque measurement were carried out to characterize the weld formability. Experimental results show that compared to conventional bobbin tool friction stir welding, the DBT-FSW has an excellent process stability, and can produce the defect-free joints in a wider range of welding parameters. These can be attributed to the significant improvement of material flow caused by the formation of a staggered layer structure and the unbalanced force between the US and LS during the DBT-FSW process. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
引用
收藏
页码：135 / 139
页数：5
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