The remelting of the surface layer of C15 steel with an electric arc

This study presents results of a research on enhancing properties of the surface layer of C15 steel by treating it with a concentrated heat stream utilizing the GTAW method. Remelting of the surface layer of C15 steel was performed by a welding head moving with a constant speed of 200 mm/min and varying current intensity of the electric arc ranging from 50A to 300A as well as with a constant current intensity of the electric arc and a varying speed of the welding head ranging from 200 mm/min to 800 mm/min. Metallographic evaluations (LM and SEM) of the resulting structure were performed as well as measurement of the hardness of the remelted layers. Correlation between current intensity of the electric arc and its speed in relation to the treated material sample and the geometry of the remelted layers and their microhardness was established.