The application of 6005A aluminum alloy in transportation is increasing, which puts forward higher requirements for the fatigue performance of welding process. In this study, friction stir welding (FSW) enhanced treatment was applied on the traditional metal inert gas (MIG) weld. The results show that the fatigue life of FSW plate is three times higher than that of original MIG welded plate at 140 MPa stress level. Under 10⁷ cycles, the fatigue life limit was increased by 16 MPa compared with as-received MIG plate. The main reason of FSW leading to the increasing fatigue life are the reduction of porosity to reduce crack initiation and grain refinement to delay crack propagation.

6005A铝合金在交通运输中的应用日益广泛，对焊接过程的疲劳性能提出了更高的要求。在这项研究中，摩擦搅拌焊接（FSW）增强处理应用于传统的金属惰性气体（MIG）焊接。结果表明，在140 MPa应力水平下，FSW板的疲劳寿命是原始MIG焊接板的三倍。在10 ⁷个循环下，疲劳寿命极限比原先的MIG板提高了16 MPa。FSW导致疲劳寿命增加的主要原因是减少孔隙率以减少裂纹萌生和晶粒细化以延迟裂纹扩展。