Comparison of the Difference in Temperature Distribution on the Surface of Two Aluminum Alloys Welded by Friction Stir Welding in Different Regions at Different Linear and Rotational Speeds
Abstract
Friction stir welding is a modern process that is used commercially on a large scale in various industries and in many countries to connect materials together without reaching the melting point of the metal during the welding process, so it is called the solid-state welding process.
In this research, a three-dimensional mathematical model was designed for friction stir welding of aluminium alloys (AA7075-T6 & AA2024-O) with dimensions (100 x 100 x 6 mm), using (ANSYS 15.0) program to compare the results of temperature distribution with distance from the welding centre to the end of the welded piece, as well as the temperature distribution from the beginning of the welding process to its end, using different rotational speeds (900, 1050, 1200 rpm) and different linear speeds (20, 40, 60, 100 mm/min). In the beginning, the rotational speed was fixed and the linear speed was made variable, and then the linear speed was fixed and the rotational speed was changed.
The experimental results showed that the increase in the rotation speed of the welding tool leads to an increase in the temperatures on the surfaces of the models that were welded by the friction stir welding method. Among the other results obtained, it was found that the increase in the traveling speed of the trolley carrying the models when the stir welding process decreases the temperatures on the surface of the models when the welding process is performed. We note the convergence of the theoretical results with the applied results.
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