Effect of Manufacture Parameters of Friction Stir Welding on the Joining Properties of 5083-O Aluminum Alloy

• Main Author: 林榮立
• Other Authors: 呂傳盛
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/58577320873862059889

碩士 === 國立臺灣師範大學 === 工業教育學系 === 93 === Abstract Friction stir welding (FSW) is an emerging solid-state joining process that produces low-distortion, high-quality, low-cost welds. The welding properties of aluminum alloys may be ameliorated by the friction stir welding technology. The objective of this study is to demonstrate the feasibility of FSW for joining of 5083-O aluminum alloy by different welding conditions. To produce high integrity welds, the process variables (RPM and material of the shoulder-pin assembly, traverse speed), the tilt angle and the tool pin design of friction stir welding must be chosen carefully. Microstructures of the welds will be examined using optical microscopy (OM). The best joining and mechanical properties of friction stir welding of Al alloy were elucidated about the effect of process variables. According to the experimental results of microstructure examination and microhardness test, the fine recrystallized grains in the stir zone and the elongated grains in the thermo-mechanical affected zone were created during friction stir welding. The hardness in the stir zone is the highest, the thermomechanically affected zone (TMAZ) and the base metal is lower. In proper welding conditions, the width of TMAZ zone decreases with increasing of the welding speed. Furthermore, the better joining quality can be achieved by the proper manufacture parameters. According to the analysis of tensile tests, the proper range of FSW parameters (ΘFSW) are from 3.1 to 9.2.