Abstract
Dissimilar friction stir welding (FSW) between 6101-T6 and 7075-T651 aluminium alloys was conducted. Three different parameters each were investigated for rotational speed and travel speed, and the effects of these parameters on the tensile behaviour, hardness and wear were evaluated. The results indicate that the ultimate tensile strength increases with an increase in the feed rate. However, the increase in rotational speed decreases the ultimate tensile values. The fractured analysis of the tensile samples shows similarities in the fractured pattern as all the samples failed at heat affected zone close to the 6101-T6 alloy. The hardness varies across the heat affected zones and nugget zone both at constant rotational speed and welding speeds. The highest resistance to wear occurred at 65 mm min−1 and 1850 rpm welding speed and rotational speed respectively while better material mixing was achieved at the nugget zone of the welds at 1250 rpm and 110 mm/min.
Highlights
One of the best technologies that have been identified to join low-temperature alloys especially aluminium is the friction stir welding (FSW)
The plates were arranged in butt configuration with the 6101-T6 placed on the advancing side (AS) while the 7075-T651 alloy was placed on the retreating side (RS)
While the effect of rotational speed and travel speed are respectively shown in Figures 5 and 6
Summary
One of the best technologies that have been identified to join low-temperature alloys especially aluminium is the friction stir welding (FSW) This welding technology emanated in 1991 and have been successfully employed to join aluminium alloy in many applications such as in marine, military, automotive and aerospace industries. The FSW utilized a rotating tool which has a pin and a shoulder When this tool rotates on a workpiece, friction occurred which generates the heat needed to plasticized the material at the joint interface, permitting the stirring of the material by the rotating tool pin. The heat generated during FSW alters the mechanical properties of the weld through microstructural modifications. This modification is often influenced by the processing parameter employed for the welding [8,9,10]. Asadi and Givi [11] established how process parameters such as feed rate and tool rotational speed as well as tool
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