AZ31镁合金TIG焊横向十字接头疲劳性能研究  

Research on Fatigue Behavior of AZ31 Magnesium Alloy Transverse Cross Joint with TIG Welding

作　　者：李晋永[1] 王文先[1] 慕伟[1] 刘金华[1] 

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《太原理工大学学报》2008年第S1期8-10,14,共4页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(50675148)

摘　　要：对8 mm厚AZ31镁合金及其TIG焊横向十字接头疲劳性能进行了试验和分析。结果表明,在2×106的循环次数下,AZ31镁合金母材的疲劳强度为36.0 MPa;TIG焊横向十字接头的疲劳强度为17.2 MPa,为母材疲劳强度的47.8%;镁合金焊接接头的疲劳特征曲线低于国际焊接学会(IIW)针对铝合金推荐的FAT28标准。所以,在镁合金焊接结构的疲劳设计中必须采取更小的疲劳设计级别。The low fatigue behavior of Mg alloy is one of factors of restricting use of Mg alloy.The fatigue behavior of AZ31 Mg alloy in 8 mm and its transverse cross joint by TIG welding was studied.The results show that the fatigue strength of base metal and welded joint are dissatisfactory,under 2×106 cycles,the fatigue strength of base metal is 36.0 MPa,and the fatigue strength of transverse cross joint is 17.2 MPa,which is 47.8% of fatigue strength of base metal.S-N curve of Mg alloy weld joint is lower than sta...

关 键 词：AZ31镁合金 TIG焊 疲劳性能 

分 类 号：TG405[金属学及工艺—焊接]