Nowadays, reduction in weight and fuel consumption in automotive and aerospace
industries is considered one of the critical challenges to reducing costs, environmental
emissions and energy consumption. Aluminum alloys 2024-T3 AA with thickness of
1mm has been selected to investigate the effect of dwell time and cooling methods,
on mechanical properties, exfoliation corrosion and metallurgical properties of
protrusion friction stir spot welding joints. The joints are produced in two different
mediums which are ambient air and underwater and the joints were studied
comparatively. The welding parameters in this study consist of 620 rpm rotational
speed and dwell time set as 5,10,15 and 20 seconds. The effect of the medium on
mechanical and microstructure properties, and corrosion resistance was analyzed.
SEM was used to inspect and analyze the fracture mode of the weld joints. The results
showed that underwater friction stir spot welded 2024-T3 joints exhibit higher joint
strength and corrosion resistance compared to that of ambient air.
By / Ramadhan H. Gardi
