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Abstract
The influence of different lap configurations and preheating process on the macro-/microstructures and mechanical properties of friction stir spot welding welds with both similar and dissimilar materials (6061-T6 aluminium alloy and AZ31B magnesium alloy) was investigated. The results showed that the different lap configurations resulted in different macro-/microstructures and mechanical properties of welds. Defect free welds and intermetallic compound containing welds were obtained in configurations of similar (Mg/Mg and Al/Al) and dissimilar (Mg/Al and Al/Mg) respectively. The welds with similar materials had the highest tensile shear strengths, followed by the Mg/Al welds; the Al/Mg welds had the lowest strength. The preheating process improved the tensile shear strengths of Mg/Mg, Al/Al and Mg/Al welds and reduced that of Al/Mg welds respectively.
Acknowledgements
This project is supported by the National Natural Science Foundation of China (grant no. 51375511) and Fundamental Research Funds for the Central Universities of China (grant nos. CDJZR13130080, CDJZR14130008 and CDJZR13130033).