摘要
对厚度为 6mm的 2 0 2 4铸铝合金板做了搅拌摩擦焊接工艺试验 .通过对焊接件拉伸强度测试 ,以及在光学显微镜和扫描电镜下对焊缝和基体显微组织的观察 ,发现焊缝比基体具有更细小的晶粒组织 ,粗大的θ(CuAl2 )相被破碎 ,且有害杂质相容易在晶界上析出 .试验结果表明 ,焊接速度为 30mm/min和焊接头旋转速度为 10 0 0r/min时 ,可以获得良好的焊接质量 .图 5 ,表 2 ,参
Friction stir welding is a newly developed welding process in recent years, it provides a way for joining of materials with poor weldability and dissimilar metals. In this paper, the 2024 cast aluminum alloy sheets (6mm thick) was welded by using friction stir welding process. The tensile strength was performed, and the microstructures of the jointed zone and the matrix were examined using optical and electron microscopes. It was found that welding seam has finer grain structure than matrix , coarseθ(CuAl 2)-phase grains were crashed ,and inimical impurity phase is apt to precipitate on crystal boundary . The result shows that good welding quality may be obtained when welding speed is 30 mm/min and rotating rate of welding-head pin is 1 000 r/min.5figs., 2tabs., 6refs.
出处
《湘潭矿业学院学报》
EI
2002年第2期37-39,共3页
Journal of Xiangtan Mining Institute
基金
国家煤炭工业局科技攻关项目
关键词
搅拌摩擦焊接
显微组织
铝合金
friction stir welding
microstructure
aluminum alloy
