期刊
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
卷 21, 期 3, 页码 164-170出版社
TAYLOR & FRANCIS LTD
DOI: 10.1179/1362171815Y.0000000078
关键词
Pinless friction stir spot welding; Nugget edge angle; Mechanical property
资金
- National Natural Science Foundation of China [51405389]
- Open Fund of Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures [2014003]
- Research Fund of State Key Laboratory of Solidification Processing (NPU, China) [108-QP-2014]
In this study, pinless friction stir spot welding of 1.8 mm thick 2198-T8 aluminium-lithium alloy plates was carried out. The change of the angle between the nugget edge and the surface, and the relationship between this angle and joint mechanical property were analysed. The results show that the angle increases rapidly initially and then approaches 45 degrees, which is due to the extrusion of nugget material and its flow along the surrounding 'cold' metal during welding. The tensile strength is determined by the nugget edge angle and hook defect. Tensile loads reach a higher value when the nugget edge angle approaches 458 but have a slight decrease with the hook angle changing from obtuse to acute. The maximum tensile/shear strength could be 8.57 kN at the rotation speed of 1500 rev min(-1) and the dwell time of 12 s.
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