Premature failure of weldments is often reportedin the industry. Once failure occurs, the common practice now a days is either to replace the whole component or repair the failed region by welding. Since repairing rather than replacing is more economical, the process of repair welding assumes technological significance. However, it is necessary to realise the problems associated with repair- welding. During most of hte repair welding cases, after repair weldments are hard and brittle. In many cases it is not possible to give post weld heat treatment (PWHT). This demands better welding techniques for repair without affecting the microstructure. Repair weldign requires adopting of special procedure and parameters to obtain acceptable properties of the repair welded regions. In this paper different repair weldign methods have ben compared from residual stress and hardness point of view.
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