Effect of material configuration and welding parameter on weld formability and mechanical properties of bobbin tool friction stir welded Al-Cu and Al-Mg aluminum alloys

The microstructure and mechanical properties of joints between Al-Cu and Al-Mg aluminum alloys using bobbin tool friction stir welding (BT-FSW) were studied. The joints were fabricated for different material configurations at various welding speeds. Results show that there are no detectable defects when the soft Al-Mg alloy is placed on the advancing side (AS). It was found that some hard-oriented grains in the stir zone on the Al-Cu side remain...