An Experimental Study of Welding Parameters for Stellite6 Overlay on Inconel825 using PTAW Process

Hard facing is a common method for improving the surface properties of components in terms of hardness, wear, corrosion and heat resistance under high pressure and high temperature conditions. Weld overlay is one of the methods to improve the surface properties, quality of weld overlaid components depends on the welding process and parameter. Therefore, it is important to optimize parameters for welding process, in this the most critical element to control is the Fe content in the weld overlay and it is observed that the corrosion properties are not affected when the Fe content is restricted below 5%. The effort is made in this study to apply the stellite6 weld overlay using Plasma transferred arc welding (PTAW) on inconel825 plate with less than 5%(wt) Fe(Iron) on the weld material. The result shows that the parameter used in this study, controls the Fe element to 4.49 % (wt) and various properties such as chemical composition, cracking tendencies, hardness across the weld overlay area.