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CSME 2019/12
Volume 40 No.6
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711-718
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Effect of Square Wave Tool Path Pattern on Mechanical and Microstructure Properties of Friction Stir Welded AA6061-Cu Dissimilar Alloys
D. Jayabalakrishnan a and M. Balasubramanian b
aDepartment of Mechanical Engineering, Sriram Engineering College, Chennai, India
bDepartment of Mechanical Engineering, RMK College of Engineering and Technology, Chennai, India
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Abstract:
In this present work friction stir welding of Al 6061-annealed pure copper dissimilar metals with square wave pattern tool pin movement was investigated. The aim of this experiment is to iden-tify the significance square wave tool movement on friction stir welding process along with three different tool pin profiles. Different tool pin profiles of square, round and spiral shapes were selected and their significant outcomes were unveiled. Friction stir welding process parameters of 1500 and 2000 rpm & tool pin movement step size of 1.0 mm and 2.0 mm & weaving rate of 100 mm/min and 150mm/min were selected. The advantages of tool movement pattern and tool pin profile shape were examined by mechanical testing, micro-structure analysis and energy dispersive X-ray analysis. The mechanical results were showed that process parameter of 1500 rpm, 1.0 mm step size, weaving rate of 150 mm/min and square tool pin profile combination gives better mechanical proper-ties. Micro structural results unveiled achievement of better grain refinement and uniform dispersion of micro constituents by implementation of square wave tool pin movement pattern along with square tool pin profile. X-ray radiography results revealed defect free nature of weldments. The EDAX report confirms that the weld nugget contains both alu-minium and copper as equal percentage, which indicates fine mixing of two parent metals.
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Keywords: Friction stir welding; Pin profile; Square wave Pattern; X-ray; Microstructure.
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*Corresponding author; e-mail: djayabal2001@gmail.com
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©
2019
CSME , ISSN 0257-9731
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