Rupture locations of friction stir welded joints of AA2017-T351 and AA6061-T6 aluminum alloys

Abstract

The tensile rupture locations of friction stir welded joints of AA2017-T351 and AA6061-T6 aluminum alloys were examined in this study. The experiments showed that the rupture locations of the joints are different for the two aluminum alloys, and they are influenced by the welding parameters. When the joints are free of welding defects, the AA2017-T351 joints are ruptured in the weld nugget adjacent to the thermo-mechanically affected zone (TMAZ) on the advancing side (AS) and the rupture surfaces appear as oval contours of the weld nugget, while the AA6061-T6 joints are ruptured in the heat affected zone (HAZ) on the retreating side (RS) and the rupture surfaces are inclined at a certain degree to the bottom surfaces of the joints. When welding defects are present in the joints, the AA2017-T351 joints are ruptured in the weld center, while the AA6061-T6 joints are ruptured on the RS near the weld center. The rupture locations of the joints are dependent on the internal structures of the joints and can be explained through them.