Fatigue crack growth in the welding nuggetof FSW joints of a 6060 aluminum alloy6060铝合金搅拌摩擦焊焊接接头的疲劳裂纹扩展行为Friction stir welded butt joints were performed on 8 mm thick sheets made of AA6060 T6 aluminum alloy by means of a CNC machine tool, at feed rates between 117 and 683 mm/min ...