高能喷丸对汽车车身铝/钢TIG焊接头组织与力学性能的影响  

Effects of Shot Peening on Microstructure and Mechanical Properties of Automobile Body Al/Steel TIG Welded Joints

作　　者：张晓旭[1] 杜子学[2] 

机构地区：[1]重庆电子工程职业学院汽车工程学院,重庆401331 [2]重庆交通大学机电与汽车工程学院,重庆400074

出　　处：《热加工工艺》2016年第23期182-184,189,共4页Hot Working Technology

基　　金：国家科技支撑计划项目(2013BAG06B01)

摘　　要：采用TIG电弧为热源,铝-硅焊丝为填充材料,对5052铝合金与镀锌钢进行熔钎焊连接。焊后采用高能喷丸工艺对铝/镀锌钢焊接接头进行喷丸强化处理,并结合SEM、XRD、光学显微镜以及万能拉伸试验机等检测方法对铝/钢TIG熔钎焊接头微观组织和力学性能进行研究。试验结果表明:当喷丸强度为0.08 MPa时,铝/钢熔钎焊接头抗拉强度最大,为135 MPa。此时接头熔焊区的平均晶粒尺寸减小至51μm,且接头表面残余压应力达到52 MPa。在拉伸试验中断裂发生在接头熔焊区,断口表现为良好的韧性断裂特征。With TIG arc as heat source and Al-Si wire as filler metal, the welding-brazing of 5052 alloy and galvanized steel was carried out. The high energy shot peening was applied to the Al/steel welded joints after the welding-brazing process. The microstructure and mechanical properties of Al/steel joints were studied by SEM, XRD, optical microscope and electronic tensile testing machine. The results show that when the shot peening pressure is 0.08 MPa, the Al/steel joint with the maximum tensile strength of 135 MPa is obtained. Besides, the average grain size orAl/steel joint decreases to 51μm and the surface residual compressive stress increases to 52 MPa. The fracture of Al/steel joint is in fusion zone during tensile testing and the fracture shows characteristics of plastic fracture.

关 键 词：铝合金 镀锌钢 TIG熔钎焊 喷丸 

分 类 号：TG407[金属学及工艺—焊接] TG668