Friction stir butt welding thin aluminum alloy sheets |
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Authors: | Yumei Yue Guoqiang Wang Kang Yang Baosheng Wu Dejun Yan |
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Affiliation: | 1.Faculty of Aerospace Engineering,Shenyang Aerospace University,Shenyang,People’s Republic of China;2.Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships,CSSC Huangpu Wenchong Shipbuilding Company Limited,Guangzhou,People’s Republic of China |
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Abstract: | 0.8-mm-thick alclad 2024-T4 aluminum alloy sheets were friction stir butt welded. A 15-mm diameter shoulder tool was used to guarantee sufficient heat input during welding. A 0.08-mm shoulder plunge depth was adopted to reduce sheet thickness reduction. Sound joints were obtained at rotating speeds from 400 to 1000 rpm and welding speeds from 50 to 150 mm/min. A thickness reduction of 6% was achieved at 1000 rpm and 50 mm/min. Secondary phases firstly precipitated at the black lines in the stir zone (SZ). The hardness of the SZ showed a decrease about 6% compared with the base metal. A maximum tensile strength of 399.5 MPa and an elongation of 5.6% were achieved at 1000 rpm and 150 mm/min. The fracture morphologies showed typical ductile fracture mode. |
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