期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 210, 期 11, 页码 1429-1435出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2010.03.022
关键词
Friction stir spot welding; 5182 Al alloy; Fracture mechanisms; Opening mode; Residual stress
The influence of the tool rotational speed, the probe plunge depth and the shoulder penetration depth on weld microstructure and on the weld strength have been studied. The shear tests showed that the friction stir spot welds fail by nugget pullout. Three microstructural factors play a determinant role on the weld's strength: the size and location of the stir zone, and the unwelded interface tip slope. With increasing rotational speed, the shear strength increases because of the larger size of the stir zone. By changing the probe plunge depth the location of the stir zone can be controlled in order to maximize the bonded distance between the interface tip and the central hole left by the probe. The shoulder penetration depth must be sufficient to ensure a horizontal interface tip and therefore avoid fracture by the opening mode (model) during shear loading. (C) 2010 Elsevier B.V. All rights reserved.
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