Microstructure and morphology evolution of probeless friction stir spot welded joints of aluminum alloy
作者： W.Y. Li , Q. Chu , X.W. Yang , J.J. Shen , A. Vairis
DOI: 10.1016/J.JMATPROTEC.2017.09.003
关键词:
摘要: Abstract A third generation Al-Li alloy has been successfully welded by probeless friction stir spot welding (P-FSSW). The joints presented symmetrical ‘basin’ shapes and two distinct regions were observed: the zone (SZ) thermo-mechanically affected (TMAZ), which characterized recrystallized grains deformed grains, respectively. In order to study relationship between P-FSSWed joint morphology mechanical strength, a phenomenological model of various geometric features these joints, including width, edge angle (SEA) hook (HA), was established. According model, actual described an ellipse its limitation, no matter how change parameters. tensile/shear strength related significantly defect, so fracture mode. Additionally, one-to-one correlation existed shoulder diameter sheet thickness achieve sound weld, useful in manufacture yield high-quality joints.
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