Friction Stir Welding of Commercially Pure Aluminum Foams Manufactured by Accumulative Roll-Bonding Process

In present study friction stir welding of commercially pure aluminum foams manufactured by accumulative roll-bonding process was investigated at rotational speeds of 500، 700، 900 and 1100 rpm and advancing speed of 25 mm/min. All welds were carried out bead on plate. Optical microscopy and microhardness tests were used to investigate the weldments microstructure and weld regions hardness، respectively. Aluminum foam porosity and density variation of weld region at different rotational speeds were evaluated by Archimedes’ principle. Results showed that increasing rotational speed at a constant advancing speed causes an increase in weld region density and a decrease in weld defects. Moreover، microhardness results showed that increasing the rotational speed results in an increase in weld region hardness.