Structure of carbon steels after remelting of the surface layer with the electric arc

This study presents results of a research on the enhancement of properties of the surface layer of carbon steels by treating it with a concentrated heat stream utilizing the GTAW method. Remelting of the surface layer of studied steels was performed by a welding head moving at 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. Correlation between the 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 structure was established.