Parametric optimization of friction stir welding for Al-Li alloy using Taguchi method
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Date
2019-05
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Effect of process parameters on friction stir welding (FSW) process characteristics and mechanical properties of weld joints have been studied. Design of experiment (DOE) approach was applied for understanding the effects of selected FSW process parameters. An L9 orthogonal array was used to investigate the effect of welding speed, rotational speed and tilt angle. An optimum tool profile was selected on the basis of trial runs made prior to final experiments. In the present research, FSW of AA8090 Al-Li alloy has been performed using conventional vertical milling machine. Numerous trial experiments were performed to establish the principal FSW process parameters to be varied during the research to investigate their effect on weld quality. The selection of tool pin, shoulder diameter and material of tool was also done through a number of trial experiments. Welding speed, rotational speed and tilt angle were selected as the FSW process parameters and three levels of each parameter from within the feasible range were considered. The experiments were performed in accordance with Taguchi’s L9 orthogonal array. Mechanical test was performed for every weld specimen. The weld quality was analyzed through tensile tests and hardness tests. The effect of process parameter on weld quality characteristics such as tensile strength and hardness was analyzed. Analysis of results of mechanical tests revealed significant effect of all three FSW parameters on tensile strength and hardness.
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