Design and Development of Electrode Coating for Hardfacing Application

Abstract

Hardfacing by welding is the most economic way to enhance the life of the components which are exposed to environment. The use of hardfacing is increasing rapidly because of the increasing costs of the components. From the literature survey, it has been found that, the experiments were performed to study the microstructure, hardness and wear behaviour of commonly available commercial hard facing alloys and their suitability for a specific application. Studies were also done to see the effect of certain additional elements on specific properties. Understanding the mechanism of wear resistance of these alloys can help customers to select an appropriate alloy for a specific application. Data created through this study will be of much use in selection of hard facing alloys. Six types of ferrochrome based hardfacing electrodes were selected to deposit layers, by the manual metal arc welding process on Low alloy steel plate. In this study, the wear responses, hardness and the microstructures were studied. Low alloy steel specimens of size 265x125x12mm were used for depositing the hardfacing layers. Further, for the various wear tests the cylindrical sample of 8mm diameter and 30mm length was made. Wear tests were carried out an a sliding wear testing machine. Microstructure characterization analysis were made using Scanning Electron Microscopy. The comparison in the wear response of hardfaced plate with the bare low alloy steel plate was also made in actual working conditions.