Geometrical Design and Optimization of Stirrer for Friction Stir Welding
Keywords:Friction, Stir, Welding, strength, stir-pin, Design, Mixing ratio, FSW, stirrer.
This paper investigates the influence of the pin geometry on mechanical properties of Aluminium 2024-T351 welded by friction stir welding (FSW). Square, triangle, and cylindrical pin geometries were studied for optimization due to the improvement ratio in tensile and bending strength. The results show that improvement ratio about 10% in mechanical properties was detected at the square pin case compared with the triangle and cylindrical pin geometries. The weld strength increases significantly by decreasing the feeding rate at all travel speeds. Calculations of the scanned zone by stirrer showed that the square pin produced the more significant mixing ratio compared to triangle pin. Development in mixing rate is about 15% by the square stirrer. Also, on the other hand, the results of the calculations of the scanned zone by stirrer pointing to that the size of mixing rate produced by the cylindrical pin is lower than the other types of tool.
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