Ultrasonic processing proves particularly effective in leading branches of technology, such as: precision mechanics, optics, electrical engineering, nuclear technology etc. High-strength joints, short machining time and low energy consumption are only three of the main ultrasonic welding advantages that determined research intensification in this field. This paper presents experimental data that illustrates the interdependence between some process parameters and their influence on the joint resistance of the copper sheet ultrasonically welded. Due to the surface friction energy, which is generated in the ultrasonic welding process, some intermolecular connections are broken and other are new are created. In order to demonstrate the quality of the ultrasonically welded copper, there were made macro and microstructural analysis that are proving an excellent metallurgical bonding. The results of microhardness tests, that were made in five different points, on each welded copper sample, revealed the ultrasonic welding process quality showing that the welded material hardness doesn't change. The copper welding experiments were made at the National Research and Development Institute for Welding and Material Testing (ISIM) Timişoara.
Experimental study of the ultrasonic welding effects in the metal joint microstructure
