Thermal Deformation Analysis Methodology Development for Inconel Overlaying

Abstract

Overlaying of Inconel on carbon steel base material is widely used in offshore and shipbuilding. The prediction of the overlay related deformation is important to accurately carry out this work with minimum loss and maximum profit. So, in this research, a detailed experimental study on the variation of the weld deposit and the HAZ area while overlay FCAW welding with carbon steel wire as well as Inconel wire on carbon steel plate was carried out and finally, with Inconel Strip to observe the material related and heat input related factor associated with overlay welding. Using this modified heat input and material related values as scale factor is applied to (Strain as Direct Boundary condition) SDB method which is presently applied for welding deformation analysis of large ship block in our shipyard. Based on this research outcome, the overlay welding related deformation was accurately predicted. By predicting the deformation accurately, optimum thickness (always above design thickness) of overlay could be applied and thus reduce the grinding related man-hour to a great extend in this process.