国产A7NO1S-T5铝合金型材MIG焊接接头疲劳性能研究  

Study on fatigue property of domestic A7N01S-T5 aluminum alloy welded joints

作　　者：刘建[1] 马传平[2] 魏书波[1] 方喜风[1] 汪认[1] 

机构地区：[1]南车青岛四方机车车辆股份有限公司,山东青岛266111 [2]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《电焊机》2014年第4期158-161,共4页Electric Welding Machine

基　　金：国家高科技研究发展计划资助项目(2011AA11A101)

摘　　要：对10 mm厚的高速列车用国产A7N01S-T5铝合金挤压型材熔化极气体保护焊(MIG)平滑接头和带余高接头进行了疲劳试验,测定了反映接头疲劳性能的S-N曲线,对典型疲劳断口进行了扫描电镜分析,比较平滑接头和带余高接头的疲劳性能。结果表明:在置信度为90%、存活率为50%、误差限为6%的条件下,平滑接头疲劳极限为105 MPa,带余高接头疲劳极限仅为75 MPa。焊接缺陷是影响平滑接头疲劳极限的主要原因,而焊趾处的应力集中则是影响带余高接头疲劳极限的主要原因。The fatigue property and S-N curves of 10mm domestic A7N01S-T5 aluminum alloy extrusion profile MIG welding smooth joints and joints with reinforcement were tested and compared.The typical fatigue fractures were analyzed by SEM.The results show that： at a confidence level of 90%,the survival rate is 50%,and 6% error limit conditions,the smooth joints fatigue limit is 105MPa, while tile joints with reinforcement fatigue limit is only 75MPa.The main reason which ＇affects the smooth joints fatigue limit is welding defects,while the joints with reinforcement fatigue limit is nminly affeeted by stress concentration at the weld toe.

关 键 词：A7N01S-T5铝合金型材 MIG焊接接头 疲劳性能 

分 类 号：TG457.1[金属学及工艺—焊接]