Abstract
In this study, a new method was proposed to remove the keyhole with the title of "protrusion friction stir spot welding", and the effect of the tool dwelling time on microstructure and mechanical properties of aluminum alloy 5052 sheets was investigated. Welding was carried out at different dwelling times of 3–18 s at a tool rotational speed of 800 rpm. Macrostructure and microstructure examinations indicated that this new method has the ability to create a non-defect metallurgical joint with a homogeneous and fine grain structure. The results of the micro hardness test showed the hardness reduction of the SZ from 57.4 HV to 48.15HV with increase in the too dwelling time (3–18 s). The tensile properties of the welding samples were evaluated using a tensile shear test. The results showed a reduction in maximum failure load from 4384.6 N to 3331 N with increase in the tool dwelling time (from 3 to 18 s). With considering dwelling time and sheets thickness, the welds produced by the present work illustrated better load capacity than other techniques.
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