Features of forming joints using solder 18XFC during induction pressure welding of K76F steel

The process of pressure induction welding with the use of activating substances occurs when the welding edges are heated to a plastic state by heat from eddy currents and complete melting of the activating substance previously introduced into the joint.The process of induction pressure welding itself was developed at the E. O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine mainly for pipes and pipe fittings. A significant contribution to the development of induction pressure welding was made by V. K. Lebedev, O. S. Pismennyi, V. D. Tabelev, M. E. Shinlov [1]. The application of induction pressure welding to solid products such as rods or parts with a developed cross-sectional area has not been fully researched. At the same time, the main task of improving the pressure induction welding process is to create the necessary uniform heating in the weld seam and in the spike zone in the ‘inductor-product’ system, and to obtain a joint which is formed in the solid phase, with common grains and minimal the possible seam thickness, after performing the deposition. Minimal residues of the reaction products of the activating substance during the welding process must be squeezed out of the cross-section of the weld when deposited in the grid and peripheral areas.The use of 18XFC solder as an activating substance during the butt-pressure induction welding process was tested on model samples. The chemical composition of this solder was studied. The main technological factors of the process of induction butt welding of model samples were determined, as well as the mechanical parameters of the resulting welded joints, and metallographic studies of the metal of the welded joint were carried out. It was established that solder residues in the form of eutectics were not detected in the obtained welded joints of the model samples. However, according to the results of metallographic studies, no hardening structures were found in the weld.