6005A-T6厚板铝合金FSW焊接接头力学性能与疲劳性能研究  

Microstructure and Mechanical Properties of 6005A-T6 Thick Aluminum Alloy Welded by FSW

作　　者：吴庆祝 许鸿吉[1] 邱劲松 刘楷 WU Qingzhu;XU Hongji;QIU Jinsong;LIU Kai(Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]大连交通大学,辽宁大连116028

出　　处：《电焊机》2022年第4期100-106,共7页Electric Welding Machine

摘　　要：铝合金厚板是轨道车辆的主要用材,为了使厚板铝合金搅拌摩擦焊批量应用于轨道车辆中,必须对铝合金厚板开展必要的力学试验和疲劳试验。文中采用搅拌摩擦焊对6005A-T6铝合金进行对搭接焊,通过金相分析、硬度、拉伸、弯曲、疲劳一系列试验,对6005A-T6铝合金焊接接头的力学性能和疲劳性能进行研究。通过对焊接接头的金相分析可以看出,焊核区的组织为细小的等轴树枝晶;热机影响区的晶粒较为粗大,有一定的方向性并伴随着很大的变形;热影响区组织相较于母材组织晶粒有明显的长大但没有变形;拉伸、弯曲试验表明,焊接接头的拉伸抗弯能力良好。疲劳试验表明,焊接接头具有一定的强度,对实际的生产制造具有一定的参考价值。Friction stir welding is used for butt lap welding of 6005 A-T6 aluminum alloy. Through a series of metallographic analysis, hardness, tensile, bending, and fatigue tests, the mechanical properties and fatigue properties of 6005 A-T6 aluminum alloy welded joints are studied. Through the metallographic analysis of the welded joints, it can be seen that the structure of the weld nugget zone is fine equiaxed dendrites;the grains in the heat-mechanical affected zone are relatively coarse and have a certain directionality and accompanied by great deformation;the structure of the heat-affected zone Compared with the base material, the grains have obvious growth but no deformation, the tensile and bending tests show that the tensile and bending resistance of the welded joint is good. The fatigue test shows that the welded joint has a certain strength,which has certain data reference value for actual production.

关 键 词：6005A-T6铝合金 搅拌摩擦焊 金相组织 力学性能 疲劳性能 

分 类 号：TG457.14[金属学及工艺—焊接]