Obtaining Joints of Dissimilar Materials under Electric-Impulse Welding – Pressing

A study of the process of high-speed consolidation of powder materials with the simultaneous formation of a welded joint with the surface of the metal base is presented. Thermal and power effects are used as a result of passing the current pulse through the powder composition and the inductor. The electric circuit of the gradual connection of the processing zone and the magnetic hammer, consisting of a flat inductor and a pusher, is proposed. The electric impulse welding-pressing device (EIWP) is connected to a impulse current generator (ICG) with a capacitive energy storage. Impulse currents of 200 - 300 kA allow to obtain Joule heat, warming up the composition to pre-melting temperatures (0,6-0,8) T m , and magnetic pressure of 500∙10 6 N/mm 2 during the process (100-200)∙10 -6 s. The equipment with energy consumption up to 10 kJ with a discharge frequency of 5 kHz is used. The study of the connection zone showed that the welding of the composition with monolithic materials occurs in the solid phase, new structures are not formed. The implemention of a monolithic material in the form of a wire into the pressing zone allows to obtain a connection of dissimilar materials keeping the original structure. In this case, the powder composition is a connecting element. Thus, copper compounds with steel, aluminum, brass and other materials are obtained. The dependences of the strength of compounds on the discharge energy of ICG are obtained