Dissimilar welds between Al alloy and stainless steel were produced with an ultrasonic welding technique. The weld strength increased with the welding energy. The welds produced with sufficiently high energy exhibited nugget pull-out failure of the Al alloy during the lap shear strength test. The welds with weld energies of more than 1.05 kJ fractured in the base metal and were severely deformed by the ultrasonic vibration, and recrystallization occurred around the weld interface owing to the shear deformation and heating during the ultrasonic welding.
Hiromichi T. Fujii, Yuta Goto, Yutaka S. Sato, Hiroyuki Kokawa
Ultrasonic welding, Al alloy 6061, 304 stainless steel, Shear deformation, Recrystallization