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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。
The TIG arc is used as the heat source and the aluminum-silicon wire is used as filler to weld 5052 aluminum alloy and galvanized steel. After welding, the shot peening process of aluminum / galvanized steel welded joint was carried out by high-energy shot peening. The microstructure of TIG fusion brazed joint of aluminum / steel and the joint of tensile test machine with SEM, XRD, optical microscope and universal tensile tester Mechanical properties of the study. The experimental results show that when the shot peening strength is 0.08 MPa, the tensile strength of aluminum / steel brazing filler metal is the highest, which is 135 MPa. In this case, the average grain size of the weld in the joint was reduced to 51μm, and the residual compressive stress on the joint surface reached 52 MPa. Fracture occurred in the joint weld zone during the tensile test and the fracture showed good ductile fracture characteristics.