轨道车辆用Al-06.Mg-06.Si铝合金焊接技术与接头性能  

Welding Technology and Joint Properties of Al-0.6Mg-0.6Si Al Alloy Used in Rail Vehicles

作　　者：杨尚磊[1] 林庆琳[2] 孟立春[2] 张峰 

机构地区：[1]上海工程技术大学材料工程学院,上海201620 [2]南车青岛四方机车车辆股份有限公司,青岛266111 [3]青岛市锅炉压力容器检验所,青岛266071

出　　处：《上海工程技术大学学报》2012年第1期1-5,共5页Journal of Shanghai University of Engineering Science

基　　金：国家自然科学基金资助项目(51075256);上海市教委科研创新重点资助项目(11ZZ177);上海市教委(第五期)重点学科基金资助项目(J51402)

摘　　要：对轨道车辆车体用新型Al-0.6Mg-06.Si铝合金型材进行了MIG焊(惰性气体保护金属极电弧焊)试验,利用拉伸试验、光学金相(OM)和扫描电镜(SEM)等方法对焊接接头的成型、气孔缺陷、性能和断口形貌进行了观察和分析.结果表明:Al-06.Mg-06.Si铝合金采用70°V型对接形式,使用MIG焊接工艺和表面抛光良好、直径1.2mm的ER5356焊丝,能够获得成型良好的焊接接头.MIG焊接工艺参数为:焊接电流160～180A,电弧电压18～20V,焊接速度6.0～6.5mm/s.焊接接头的抗拉强度为266MPa,断后伸长率为6.1%,断口位于焊缝,断裂形式为韧性断裂,断口呈典型的韧窝结构.The new type Al-0.6Mg-0.6Si Al alloy profile used in rail vehicles was welded by MIG welding.The appearance,pore defect,property and fracture morphology of the joint were observed and analyzed by tensile test,OM and SEM methods.The results of experimentation show that good welding appearances of Al-0.6Mg-0.6Si Al alloy joints can be obtained by using the butt sample of 70° V groove type,MIG welding procedure,ER5356 wire with diameter 1.2 mm and good surface polishing.The MIG welding parameters are that welding current is 160~180 A,welding voltage is 18~20 V and welding speed is 6.0~6.5 mm/s.The tensile strength of the joint is 266 MPa,the elongation percentage after fracture is 6.1%,The fracture occurred in the welding seam with a typical dimple failure mode.

关 键 词：轨道车辆 铝合金 焊接技术 断口形貌 

分 类 号：TG406[金属学及工艺—焊接]