INVESTIGATION OF MECHANICAL AND METALLURGICAL PROPERTIES OF FRICTION STIR WELDED MAGNESIUM ALLOY
Abstract
Main objective of this study is to evaluate some fundamental observations on the effect of welding processes on mechanical and microstructural behavior of magnesium alloy. Weldability of magnesium alloys has recently been investigated with a variety of processes, particularly gas tungsten arc welding, laser beam welding and friction stir welding. Even though these magnesium alloys are easily weldable by fusion welding processes, the welded joint strength is poor. Hence the FSW process parameter must be optimized to get high quality joints. In this investigation, the effect of process parameters on Friction Stir Welding of AZ63 magnesium alloy were studied. The joining of magnesium alloy by conventional methods is very difficult due to the problems such as crack formation, void formation, expulsion in the weld zone. The joining of aluminum alloy by conventional welding process can problems such as presence of segregation, blow hole, crack formation and porosities and including loss of alloying elements. These problems can be eliminated by using friction stir welding technique which offers an alternative through solid-state bonding. Samples were prepared for the mechanical testing and micro-structural characterization.
Downloads
References
American Welding Society A2 Committee on Definitions and Symbols, (2010), Standard Welding Terms and Definitions, Miami.
Thomas W M Nicholas E D Needham J C Murch M G Temple-Smith P and Dawes C J (1991), “Friction-stir butt welding and GB Patent No. 9125978.8”, International patent application No. PCT/GB92/02203.
Motalleb-Nejad P Saeid T Heidarzadeh A Darzi K H and Ashjari M (2014). “Effect of tool pin profile on microstructure and mechanical properties of friction stir welded az31b magnesium alloy.” Materials and Design, (59), 221 - 226.
J F G H C C C N S Bi G Sun Z and Wei J (2014), “Friction stir welding of dissimilar materials between AA6061 and AA7075 al alloy effects of process parameters”, Materials and Design, (56), 185 - 192.
Cao X and Jahazi M (2009), “Effect of welding speed on the quality of friction stir welded butt joints of a magnesium alloy”, Materials and Design, (30), 2033 - 2042.
Razal Rose A Manisekar K Balasubramanian V Rajakumar S (2012), “Prediction and Optimization of Pulsed Current Tungsten Inert Gas Welding Parameters To Attain Maximum Tensile Strength in Az61a Magnesium Alloy”, Materials and Design 37, 334–348.
