Study on FSW Butt Joint Properties of Dissimilar Wrought AA6063-T1 Aluminum Alloy and Cast Al-Mg Aluminum Alloy

摘要

This paper focused on applying friction stir weld method on welding a butt joint of wrought 6063-T1 aluminum alloy and cast Mg-Si aluminum alloy and studied on effect of various parameters such as rotating speeds and travelling speeds. The experiment revealed that a variation of the rotating and travelling speeds affected to vary the weld quality. Higher rotating speed and higher travelling speed produced the defects such as voids that directly decreased tensile strength of the joint. When the sound weld metal with the high tensile strength was produced, the failure of the tensile test specimen was located at the cast aluminum alloy. The average tensile strength of the sound joints was 10-15% higher than that of the cast aluminum alloy. Microstructure investigation of the specimen with the optimum welding parameter revealed that the combination of the aluminum alloys was completed without any defect in the weld metal. Compressed force by the welding tool produced the small compacted grain in the weld metal and small combined banding area at the interface of both the cast aluminum alloy and the weld metal.