镁合金真空电子束焊焊缝形貌与性能研究  

Appearance and properties of welded seam of magnesium alloy by electron beam welding

作　　者：申彬[1] 叶宏[1] 罗怡[1] 

机构地区：[1]重庆工学院材料科学与工程学院,400050

出　　处：《焊接》2008年第9期29-32,共4页Welding & Joining

基　　金：重庆市自然科学基金资助项目(2006BB4391)

摘　　要：准确掌握焊接过程温度场的变化情况,对提高镁合金的焊接质量有着重要作用。采用数值模拟方法针对不同焊接速度的工艺条件下,计算出AZ61镁合金真空电子束焊接过程中温度场的分布状态和焊缝的形貌情况,从而获得较优的焊接工艺参数;并通过试验数据,进一步讨论在优化工艺参数条件下的焊缝形貌、硬度分布情况。结果表明,在焊缝表面熔池宽度和横向焊缝深度等方面计算结果与试验结果十分吻合,接头没有明显的热影响区;焊缝为细小的等轴晶且第二相均匀分布在其间,焊缝硬度分布沿焊缝横向成依次递减趋势且大于母材。The accurate prediction of variation of welding temperature field is much important to improve the weld quality.With groups of different parameters,numerical simulation was applied to AZ61 magnesium alloy.By comparing to the results of weld appearance,a group of optimized parameter was used to discuss the results of weld appearance and analyze the distribution of hardness.The results show that the weld bead width and penetration depth in experiment agree well with that of numerical simulation.The hardness decreases along the weld transversal section gradually which is higher than base material.

关 键 词：镁合金 电子束焊 数值模拟 

分 类 号：TG456.3[金属学及工艺—焊接]