Abstract
In the present study, friction stir lap welding (FSLW) of 1 + 1.8 mm Ti–6Al–4V alloy was carried out using different rotating speeds. Effect of tool rotating speed on defect, phase transformation, and mechanical properties of the joints was mainly discussed. Results show that void defect at the joint bottom can be eliminated by decreasing the rotating speed. Microstructure shows difference along thickness due to big temperature gradient. Hardness values of the joints are higher than the base material and bigger hardness values can be obtained using low rotating speed. Lap shear properties of the joints when the retreating sides (RS) of the upper sheets bear the main loads (configuration B) are higher than those of the joints when the advancing sides (AS) of the upper sheets bear the main loads (configuration A). The maximum failure load of 19.08 KN is attained using 150 rpm and configuration B. Shear fracture mode and tensile fracture mode can be obtained during the lap shear test.
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