The Influence of Tool Tilt Angle on the Friction Stir Welding Characteristics of Wrought Magnesium Alloy Plates

Document Type : Article

Author

Department of Mechanical Engineering Technology, CAIT, Jazan University, Jizan 82817-2820, Kingdom of Saudi Arabia

Abstract

During the friction stir welding (FSW) process, the influence of the tool tilt angle (TA) over mechanical characteristics and microstructure of wrought magnesium alloy was examined. FSW was performed using fixtures and a clamping system specially developed for the present work, by varying the TA from 0o-3o with an interval of 1o whilst the tool rotational and traverse speed were stable at 1400rpm and 112mm/min, distinctively. Microstructural characterization, hardness measurement, and tensile testing were executed to evaluate the FSW joint characteristics. When compared to other joints, an experimental analysis showed that the joint produced at 0o TA has better mechanical and metallurgical properties. The incorporated parameters 1400tool rpm, 112mm/min traversing speed produced defect-free welds and improved joint strength with the utmost tensile strength of 187MPa and micro-hardness of 75HV. Tensile strength decreased with increasing tool tilt angle, with the lowest joint strength of 161 MPa recorded at the maximum TA 3o. The coarse grains of the original alloy ~35 m altered to refined grains at the weld stirred zone, with an average grain size of 11 μm, 14 μm, 16 μm, and 18 μm, corresponding to 0o, 1o, 2o, and 3o TAs, respectively.

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Scientia Iranica

Articles in Press, Accepted Manuscript
Available Online from 19 May 2024

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