[Retracted] Microstructure and Fatigue Properties of 6061 Aluminum Alloy Laser-MIG Hybrid Welding Joint

Figure 7

Fracture morphology of BM fatigue sample with stress amplitude of 121 MPa. (a) Overall fracture morphology. (b) Crack source. (c) Energy spectrum analysis result of yellow point in (b). (d) Fatigue crack propagation region. (e) Fatigue striation morphology. (f) Transient fracture region.