DEVELOPING EMPIRICAL RELATIONSHIP TO PREDICT THE TENSILE STRENGTH OF FRICTION STIR WELDED BUTT JOINTS OF AA2014-T6 ALUMINUM ALLOY
Keywords:
Friction stir welding, Al-Cu alloy, Butt joint, Tensile strength, Design of experiments, Analysis of varianceAbstract
The copper containing aluminum alloy (AA2014) has been widely used in aircraft structural applications due to exceptional characteristics of corrosion resistance, high strength to weight ratio and good formability. Welding of these grade of aluminum alloys is very difficult by fusion welding techniques. Because, the joints can become more susceptible to stress corrosion cracking and hot cracking, alloy segregation, etc. So, they are mechanically fastened rather than fusion welded. Friction stir welding (FSW) is a new solid state welding process, in which the material being welded does not melt and not involve any phase transformation. However, there are many FSW parameters controlling the strength and performance of the joints. Hence, in this investigation, an attempt has been made to develop empirical relationship to predict tensile strength of butt joints of AA2014 aluminum alloy incorporating predominant FSW parameters. The developed empirical relationship can be effectively used to predict the tensile strength of friction stir welded butt joints of AA2014 –T6 aluminum alloy at the 95% confidence level.
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