| Abstract Scope |
Macro sections from friction stir welds in 25-mm 7075-T6 aluminum were analyzed to study possible relationships between unit-area quantities (such as average flow stress, lateral pressure, shoulder pressure, heat flux and energy density) basic forces, and the internal structure of the welds. Various features of the sections were examined, including stir zone size and shape, distortion of the grain structure outside of the stir zone and the presence of volumetric defects. This analysis was part of a continuing program to develop unit-area analysis as a means of gaining additional insight into the welding process with possible implications for machine learning and advanced welding controls. |