Multi-response optimization in laser cladding process of WC powder on Inconel 718

Abstract

In this study, laser cladding process of WC on Inconel 718 is investigated. Response surface methodology (RSM) benefiting from the desirability approach is used to achieve cladded layer of proper geometry with minimum dilution, porosity, cracks, and highly efficient process. In order to validate the models, confirmation experiments are carried out and the results indicate that the laser power is the dominant factor affecting the dilution and clad width, while porosity and cracks are highly affected by scanning velocity. Furthermore, adhesion test results and subsequent hardness testing suggest good bonding of clad layer to the substrate as well as desirable quality of clad.