Fig. 7
From: Pre-weld friction stir processing mitigates hot cracking and strengthens AA6061 fusion welds
Mechanical properties of welds made on FSP-treated AA6061-T6: (a) engineering stress–strain curves of the welds at as-weld and T6 conditions. The stress–strain curve of AA6061-T6 base metal is also superimposed. (b) the ultimate tensile strength of the welds made on FSP-treated AA6061-T6, compared to the welds produced using conventional methods including friction stir welding35,36,37,38,39, fusion welding using 5356 filler metal40,41,42,43 and fusion welding using 4043 filler metal44,45,46,47, (c) SEM fractography of AA6061-T6 base metal after tensile test, (d) SEM fractography of AA6061-T6 welds made on FSP-treated AA6061 base metal. The arrows indicate micro-pores and micro-cracks.
