Hardfacing and its effect on wear and corrossion performance of various ferrous welded mild steels

Abstract

Abstract Wear and corrosion exist as one of the main important factor of energy and material losses in mechanical and chemical process. This work is about the methods to evaluate the wear and corrosion resistant properties of the mild steel like EN-8, EN-9 and EN-24 by calculating its corrosion rate. All materials have to be analyzed for its wear properties since higher wear can lead to a machine failure. The Pin on Disc apparatus is used for the analysis. Every oil-washed system- engines, hydraulics, transmissions, and final drives- produces wear metals in everyday operation. If wear accelerates, the concentration of wear metal particles increases, signaling a problem. Wear Analysis allows us to find problems before they result in major repairs or machine failure. Prediction of the material behaviour at the increasing load is necessary for a safe working of the machines. The ferrous materials are hardfaced using Tungsten Inert Gas welding process. The wear analysis of ferrous welded materials is carriedout. The various forms of mild steel selected are selected are EN 8, EN 9, EN 24. The materials are hardfaced using TIG (Tungsten Inert Gas) welding process and filler material used is same for all the materials. The materials are cut into specific dimensions using Wire cut EDM process. These specimens are tested for its wear properties, microhardness etc. Pin on Disc apparatus is used for wear analysis and Vicker’s microhardness tester is used for microhardness. Similarly a corroded component results in reduced life. Corrosion results in unexpected failures of critical components. Corrosion testing is a very time-consuming process; especially in the case of outdoor atmospheric tests. Such long timescales involved in such tests prevent the opportunity for proper materials selection. The vey commonly used corrosion tests are measurements of the weight loss or thickness loss. This test can be simply done in laboratory in limited period of time and thereby it’s possible to predict the corrosion rate of the materials. By comparing wear and corrosion rates of hardfaced and non hardfaced surface its possible to conclude that the hardfacing improves both the wear and corrosion resistant property of these materials. .