Effect of weld curvature radius and tool rotation direction on joint microstructure in friction stir welding casting alloys |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, PR China;2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;1. Universidad Nacional Experimental Francisco de Miranda, Departamento de Mecánica y Tecnología de Producción, Falcón, Venezuela;2. Universidad Nacional de Colombia, Facultad de Minas, Departamento de Ingeniería Civil, A.A. 75267, Medellín, Colombia;3. Universidad Simón Bolívar, Departamento de Mecánica, Apdo. 89000, Caracas 1080-A, Venezuela;1. Division of Chemical Engineering, Dankook University, 126, Jukjeon-dong, Suji-gu, Gyeonggi-do 448-701, Republic of Korea;2. Compound Development Team1, Kumho Tire R&D Center, 215-21, Saeun-ro, Giheung-gu, Yongin-si, Gyeonggi-do 446-909, Republic of Korea;3. Applied Rheology Center, Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 121-742, Republic of Korea;1. Institute of Metal Forming (IMF), TU Bergakademie Freiberg, Berhard-von-Cotta-Str. 4, 09599 Freiberg, Germany;2. Laboratory for Machine Tools and Production Engineering (WZL) RWTH Aachen University, Steinbachstraße 19, 52074 Aachen, Germany;3. Professorship of Virtual Production Engineering (ViF), TU Chemnitz, Reichenhainer Str. 70, 09126 Chemnitz, Germany;1. Universidad Nacional Experimental Francisco de Miranda, Departamento de Mecánica y Tecnología de Producción, Falcón, Venezuela;2. Universidad Nacional de Colombia, Facultad de Minas, Departamento de Ingeniería Civil, Medellín, Colombia;3. Universidad Simón Bolívar, Departamento de Mecánica, Apdo. 89000, Caracas 1080-A, Venezuela |
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| Abstract: | Curved welds were designed and the effects of the weld curvature radius and tool rotation direction on the microstructure of friction stir welded cast aluminum alloy joints were investigated. Results show that both the weld curvature radius and tool rotation direction have a significant influence on the microstructure of the curved joints during FSW. With decreasing weld curvature radius, the size of the tunnel defect is reduces and the proportion of fine Si particles in the stir zone increases. Si particles are finer and denser in the retreating side (RS) than that in the advancing side (AS) when both the welding direction and tool rotation direction are anticlockwise. However, when the welding direction is anticlockwise while the tool rotates clockwise, the proportions of fine Si particles decrease compared to the former situation. Furthermore, the tunnel defect is more likely to be present in the AS in the former situation. |
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