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BİLİCİ, MUSTAFA KEMAL

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BİLİCİ

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MUSTAFA KEMAL

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2012 - 20133
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Subject: RESISTANCE ×

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Now showing 1 - 3 of 3
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    Effect of tool geometry on friction stir spot welding of polypropylene sheets
    (BUDAPEST UNIV TECHNOL & ECON, 2012) BİLİCİ, MUSTAFA KEMAL; Bilici, M. K.
    The effects of tool geometry and properties on friction stir spot welding properties of polypropylene sheets were studied. Four different tool pin geometries, with varying pin angles, pin lengths, shoulder diameters and shoulder angles were used for friction stir spot welding. All the welding operations were done at the room temperature. Lap-shear tensile tests were carried out to find the weld static strength. Weld cross section appearance observations were also done. From the experiments the effect of tool geometry on friction stir spot weld formation and weld strength were determined. The optimum tool geometry for 4 mm thick polypropylene sheets were determined. The tapered cylindrical pin gave the biggest and the straight cylindrical pin gave the lowest lap-shear fracture load.
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    Effects of welding parameters on friction stir spot welding of high density polyethylene sheets
    (ELSEVIER SCI LTD, 2012) BİLİCİ, MUSTAFA KEMAL; Bilici, Mustafa Kemal; Yukler, Ahmet Irfan
    Friction stir spot welding parameters affect the weld strength of thermoplastics, such as high density polyethylene (HOPE) sheets. The effects of the welding parameters on static strength of friction stir spot welds of high density polyethylene sheets were investigated. For maximizing the weld strength, the selection of welding parameters is very important. In lap-shear tests two fracture modes were observed; cross nugget failure and pull nugget failure. The tool rotational speed, tool plunge depth and dwell time were determined to be important in the joint formation and its strength. The joint which had a better strength fails with a pull nugget failure morphology. Weld cross section image analysis of the joints were done with a video spectral comparator. The plunge rate of the tool was determined to have a negligible effect on friction stir spot welding. (C) 2011 Elsevier Ltd. All rights reserved.
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    Application of Taguchi approach to optimize of FSSW parameters on joint properties of dissimilar AA2024-T3 and AA5754-H22 aluminum alloys
    (ELSEVIER SCI LTD, 2013) BİLİCİ, MUSTAFA KEMAL; Bozkurt, Yahya; Bilici, Mustafa Kemal
    In this study, the effect of plate positioning on mechanical properties of dissimilar lap joints was investigated by friction stir spot welding (FSSW) process. The determination of the welding parameters plays an important role for the weld strength. For the effective use of the dissimilar aluminum joints, the FSSW must have an adequate strength. The quality of the joint was evaluated by examining the characteristics of the joining efficiency as a result of the lap-shear tensile test. Four process parameters were selected: the tool rotation speed, dwell time, tool plunge depth, and tilt angle. The process parameters were optimized by Taguchi technique based on Taguchi's L9 orthogonal array. The optimum welding process parameters were predicted, and their percentage of contribution was estimated by applying the signal-to-noise ratio and analysis of variance. The experimental results showed that the positioning of the plates played an important role on the strength of the joints. Finally, the results were confirmed by further experiments. Crown Copyright (c) 2013 Published by Elsevier Ltd. All rights reserved.