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Formation mechanism of weld loose defect in friction stir welding thick plates of aluminum alloy
MAO Yuqing, KE Liming, LIU Fencheng, CHEN Yuhua
ACTA AERONAUTICAET ASTRONAUTICA SINICA . 2017, (3): 420367 -420367 .  DOI: 10.7527/S1000-6893.2016.0197