Microstructural characterization and grain refinement of AA6082 gas tungsten arc welds by scandium modified fillers

► Primary Al3Sc particles resulted in grain refinement by heterogeneous nucleation. ► Weld metal strength and hardness improved due to grain refinement caused by Sc. ► Weld metal responded to post-weld aging treatment due to dilution from base metal. ► Sc addition improved the high temperature mechanical properties of welds.