抄録
In order to investigate the fatigue characteristics of A2024/A6061 Aluminum alloys dissimilar friction stir welded joints, A2024 and A6061 plates were joined with the welding speed of 6lmmimin and the rotating speed of tool of 1400rpm. Fatigue tests were conducted at stress ratio R=-1, cyclic speed 23.3 Hz with plane bending fatigue condition. Fatigue strength of FSW joints were similar to A6061 base metal, but in the high stress region, fatigue life of FSW joints were shorter life than one of A6061 base metal. Crack growth rate of FSW joints were faster than parent metal and many crack were generated in the FSW joints in high stress region. Fracture position of FSW joints were shifted about 3mm to 5mm A6061 side from weld center. Weld zone of FSW joints were softening due to temperature rise during the FSW process. Hardness of weakest point of FSW joints were about 61HV. Fracture position and Vickers hardness decline position corresponds well.
