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The engine valve made up of two different metals are knows as bi-metal Valves. This is done using friction welding process. Exhaust valves are especially made from bi-metal. Austentic Steel which is having heat resistance and corrosion resistance properties, is used at the head while the stem is made from Martensitic Steel which have high tensile strength and abrasive wear resistance property. This technique is mainly used in high stressed exhaust valves.