EFFECT OF CURRENT PULSES ON ACTIVATION OF WELDED SURFACES OF PLATES FROM DISSIMILAR METALS (STEEL 20 + COPPER M1)

摘要

Presented are the results of engineering process of welding of plates from dissimilar metals (steel 20 + copper M1) under conditions of passing of high-density current pulses. Pulse current generator GIT-50, developed in the Institute of Pulse Processes and Technologies of the NAS of Ukraine, was used for welding processes activation. Application of complex investigation method allowed determining that different stages of the process of welded joint formation take place on a contact interaction surface of macroscopic size. It is caused by in homogeneity of the real surfaces of solid bodies even at high class of their treatment. The results of examination of steel surface fine structure indicate that treatment of the preliminary compressed plates with the high-density pulses results in significant activation of the dislocation transformations, having significant effect on development of the third stage of solid state welding process, i.e. stage of volumetric interaction.