Effect of electrode and weld current on the physical and mechanical properties of cast iron welding

Abstract

Metal casting industry will repair the products are defective. The repair process is often done using a Shielded Metal Arc Welding (SMAW). Preheat and post-weld heat treatment method can overcome the problem of welding cast iron. However, many of the local foundry industry does not use this method. The main problem of the method relates to the problem of cost and process. The results of testing Scanning Electron Microscopy (SEM), gray cast iron welding seen to have an important problem in the PMZ and HAZ. Hard and brittle phase formations during solidification process and after solidification formation eutectoid is carbide and martensite. The formation of martensite and carbides is caused by the high carbon content of cast iron. Consumable electrode with a nickel base material used for the welding process without preheating and PWHT methods. Nickel as an austenite stabilizer can pick up the carbon, so that the hard phase PMZ area can be reduced. Variations electric current used to get good heat input in t...