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Title: quotExperimental and Numerical Studies of Friction Stir Welded Joints of Aluminium alloy AA5052 H32 Platesquot
Researcher: MADHAVI, BARLA
Guide(s): Jeevan Jaidi
Keywords: Engineering and Technology, Mechanical Engineering, Friction Stir Welded, Aluminium-alloy
University: Birla Institute of Technology and Science
Completed Date: 2017
Abstract: The manufacturing industry has shown considerable interest in Friction Stir Welding (FSW) technology in the past two decades. But the detailed understanding of different physical phenomena involved is incomplete. Particularly, the complete understanding of plasticized material flow around the rotating tool is crucial for optimizing the FSW process parameters (tool rotational speed - RS, traverse speed - TS, tool tilt angle - and#945;, tool-pin height - TPH, axial force - P) and design of tool geometry. Therefore, a detailed experimental and numerical simulation study on the effect of FSW process parameters on the material flow and the resulting mechanical properties of the weldment would contribute to improving the joint quality and increasing the productivity. newlineA thorough experimental works have been carried out to study the effects of FSW process parameters (TS, RS and TPH) on the nugget geometry(shape and size) and final mechanical properties of aluminium-alloy (AA5052-H32) plates. Butt welding of 4 mm thick plates were done with D2 tool-steel having 6.0 mm pin diameter, 16.0 mm shoulder diameter with 2° inward taper on the tool shoulder. Several initial trial welds were produced with different combinations of process parameters ensuring negligible material outflow and to narrow down the range of process parameters for the selected workpiece thickness. Subsequently, the effects of TS (28-56 mm/min), RS (355-710 rpm) and TPH (2.5-3.5 mm) on mechanical properties such as hardness, tensile strength and percentage (%) elongation were studied for which proper welds with and with out defect welds were observed. The observations from the mechanical testing and optical microscopic studies revealed significant variations in the final mechanical properties across the nugget geometry in contrast to that of the base metal (BM) values. Also, almost minimum to no defects were observed at TPH value equal to 3.0 mm, as compared to 2.5 mm and 3.5 mm, respectively, for the selected 4 mm thick workpieces. Therefore, an optimum value of
Pagination: 155p.
Appears in Departments:Mechanical Engineering

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