| Abstract: | The effect of welding processes friction stir welds (FSW) and (TIG) on fatigue properties of LF2 aluminum welded joints were analyzed and the S-N curve of the welded joints were established. The results show that the fatigue properties of FSW welded joints are better than that of TIG welded joints. Fatigue strength of friction stir welds is determined as 59~65MPa under N=106. Microstructures of joints are comparatively fine grain and narrow HAZ zone in the FSW welds which inhibit the growth of crack and produce high fatigue life compared to that of the TIG welds. Fracture morphologies of TIG welds show that the fatigue fracture occurs from weld defects. |
