Investigations on the Parametric Effects of Ultrasonic Welding Process on Metallographic Aspects of Al- Al Alloys Joints - N. Mohan Raj, N.; Kumaraswamidhas, L. A.; Arungalai Vendan, S.; Thangam, Chiannadurai (Annals of “Dunarea de Jos” University of Galati. Fascicle XII, Welding Equipment and Technology, 2015)