Pulsed powder technologies for the production of permanent compounds from heterogeneous materials

Abstract

Abstract A study of the process of high-speed consolidation of powder materials with 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 a current pulse through the powder composition and the inductor. The electric scheme of serial connection of a zone of processing and the magnetic hammer consisting of the flat inductor and the pusher is offered. The device of electric pulse welding-pressing is connected to the pulse current generator with a capacitive energy storage. Pulsed currents with amplitude of 200 – 300 kA allow to obtain Joule heat, warming up the composition to premelting temperatures (0.6 – 0.8) Tp., and magnetic pressure of 500·106 N / mm2 during the process (100 · 200) · 10−6 s. energy-intensive equipment up to 10 kJ with a discharge current 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, no new structures are formed. The introduction of a monolithic material in the form of a wire into the pressing zone allows to obtain a connection of different materials with the preservation of the original structure. The powder composition is in this case the 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 pulse current generator are obtained.