Studying the plunge stage of the tool with a square pin in friction stir welding

چکیده مقاله

Study the plunge stage, provides a more complete understanding of the process and can also can be used to study the friction stir spot welding. In this study plunge stage has been studied by experimental methods. The results of this study are used as initial conditions for Theoretical analysis of welding process. In this study plunge stage has been studied by experimental methods. The temperature distribution around the tool, and microstructure evaluations of the workpiece were investigated by using the square pin shape tool. Experiments were performed on aluminium 7050 plates with coincident measurement of temperature at four points around the tool on the workpiece. Temperature distribution around the tool was obviously asymmetric and the highest temperature was at the advancing side. Microstructural studies showed that four regions with different microstrucrurs are formed around the tool during the process. These areas based on differences in grain size and elongations were separated. Grains near the tool are elongated in a particular direction that show the material flow direction.

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