6005A-T6铝合金双轴肩搅拌摩擦焊接头疲劳性能分析  

Study on the fatigue performance of bobbin tool friction stir welding of 6005A-T6 aluminum alloy

作　　者：张欣盟 高士康 李高辉[2] 张海峰 周利[2,3] 王苹 ZHANG Xinmeng;GAO Shikang;LI Gaohui;ZHANG Haifeng;ZHOU Li;WANG Ping(CRRC Changchun Railway Vehicles Co.LTD,Changchun,130062,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,150001,China;Shandong Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology at Weihai,Weihai,264209,China;Harbin Institute of Technology at Weihai,Weihai,264209,China)

机构地区：[1]中车长春轨道客车股份有限公司,长春130062 [2]哈尔滨工业大学,先进焊接与连接国家重点实验室,哈尔滨150001 [3]哈尔滨工业大学(威海),山东省特种焊接技术重点实验室,威海264209 [4]哈尔滨工业大学(威海),威海264209

出　　处：《焊接学报》2023年第9期30-36,I0004,I0005,共9页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51974100);铝合金车本侧墙搅拌摩擦焊焊接接头优化设计研究开发项目。

摘　　要：通过对3.3 mm厚6005A-T6铝合金型材双轴肩搅拌摩擦焊接头进行疲劳试验,分析型材平行段宽度及厚度对试件疲劳性能的影响;并结合典型参数下焊接接头的宏观成形及其微观组织演变,揭示型材双轴肩搅拌摩擦焊接头的断裂行为.结果表明,典型参数下(转速1000 r/min、焊接速度100 mm/min、平行段宽度和厚度分别为11.8 mm和3.1 mm)接头的拉伸断裂位置位于后退侧热影响区;型材接头前进侧热力影响区晶粒组织的特征会影响型材疲劳裂纹产生与开动;疲劳断口扫描分析显示断口无明显缺陷,试件疲劳条带的扩展区和瞬断区具有典型的疲劳断裂特征,断裂发生在前进侧热影响区位置.The fatigue tests of bobbin tool friction stir welding profile joints of 3.3 mm thick 6005A-T6 aluminum alloy with different dimensions were carried out to analyze the fatigue performance of the joints.Combined with the macroscopic forming and microstructure evolution of the joint under typical parameters,the fracture behavior of the bobbin tool friction stir welded joint was revealed.The results showed that the tensile fracture of the joint under typical parameters(rotation speed of 1000 r/min,welding speed of 100 mm/min,width and thickness of parallel section of 11.8 mm and 3.1 mm)was located in the HAZ-RS.The grain structure characteristics in the TMAZ-AS of the joint could influence the fatigue cracks generation and propagation.The SEM analysis of fatigue fracture showed that no obvious defects were found.The fatigue cracks propagation and fracture zones showed typical fatigue fracture characteristics,and the fracture was located in the TMAZ-AS of the joint.

关 键 词：搅拌摩擦焊 6005铝合金型材接头 疲劳裂纹扩展 

分 类 号：TG457.14[金属学及工艺—焊接]