Effect of Friction Stir Welding Process Speed and Tool Pin Length on the Mechanical Properties of the Resulting Weld Joint between AA7075 and AA6061 Aluminum Alloys
AH Oliewe1, M Shakeri1* and WS Abdullah2
1Babol Noushirvani University of Technology, Faculty of Mechanical Engineering, Iran
2Southren Technical University, Mechanical Engineering Dept., Iraq
*Corresponding Author: M Shakeri, Babol Noushirvani University of Technology, Faculty of Mechanical Engineering, Iran.
Published: July 12, 2024
Abstract
Aluminum alloys have received wide attention in the field of industry in recent times due to their lightweight, high resistance to corrosion, and ease of formation. In addition to their availability and affordability, the problems that occur in the welding of aluminum by traditional methods make the friction stir welding process one of the most important welding processes. This solid-state welding process was discovered in 1991 by TUW and is widely used in the welding of dissimilar aluminum alloys. In our research, we welded two important aluminum alloys in the industry (A7075/AA6061) with a thickness of 3mm. We changed some welding process parameters, including tool pin length, feed rate, and rotational speed. After placing an alloy (AA 6061) in the advanced side and tilting the tool, we examined the welded samples to find out the effect of the aforementioned parameters on the tensile strength and resulting hardness. We found that the length of the tool pin has the greatest influence on these properties, as they increase with the increase in the length of the pin. We also noted that the rotation speed and feed rate have a joint effect on the mechanical properties. The highest hardness was obtained at feed rates of 20 and 45 mm/min and rotational speeds of 1200 and 900 rpm, respectively. The highest tensile strength of 209 Mpa was obtained at a rotation speed of 1200 rpm and a feed rate of 20 mm/min.
Keywords: Friction stir welding; pin length; AA7075 and AA6061 aluminum alloys
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