Improving weld formability by a novel dual-rotation bobbin tool friction stir welding |
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| Authors: | FF Wang WY Li J Shen Q Wen JF dos Santos |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an 710072, China;2. Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Mechanics, Geesthacht 21502, Germany;3. China Academy of Launch Vehicle Technology, Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China |
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| Abstract: | 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. |
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| Keywords: | Bobbin tool friction stir welding Dual rotation Material flow Microstructure Microhardness |
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