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Ye S.-Y.,State Key Laboratory of Complicated Equipment Design and Extreme Manufacturing | He D.-Q.,State Key Laboratory of Complicated Equipment Design and Extreme Manufacturing | Yang K.-Y.,State Key Laboratory of Complicated Equipment Design and Extreme Manufacturing | Zhu J.-M.,State Key Laboratory of Complicated Equipment Design and Extreme Manufacturing | And 2 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2013

To investigate the effect of ultrasonic assisted friction stir welding (UAFSW) on residual stress of weld line, 1.8 mm thick 2024-T4 aluminum alloy plates were welded by UAFSW with 20 kHz ultrasonic, and the residual stress of UAFSW was measured by X-ray diffraction and compared with that of friction stir welding (FSW) under the same process parameters. The results indicate that when the stirring rate is 1200 r/min and the welding speed is 160 mm/min, the longitudinal residual stress of UAFSW reduces 38 MPa compared with that of FSW on average, which is decreased by 28.5%. And the longitudinal residual stress along the weld line of UAFSW is much more even than that of FSW. UASFW has small impact on the transverse residual stress, which is nearly equal to that of FSW. The transverse residual stress increases as the welding speed increasing at a constant rotation rate. Source

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