Impact and Measurement Techniques of Residual Stress in Welding of Bimetallic Material

Objectives: The welding techniques are being developed at a very fast pace with novel and efficient techniques coming up for unconventional cases such as dissimilar metal joints between plates of various types, which have various practical applications, like in nuclear power plants. Methods/Statistical Analysis: A few strategies and procedures have been proposed furthermore have been connected for measuring residual stress (σR) in a few metals. Some of such strategies are: stress relaxation procedures, X-Ray Diffraction methods, Techniques utilizing stress touchy properties and Cracking systems. In addition, endeavors have additionally been made to use ultrasonic and hardness strategies to decide remaining burdens in metals by measuring stress sensitivity properties. Finding: Failure investigations of many dissimilar joints and literature review have revealed that several failures of the dissimilar welded joints have taken place in the Heat Affected Zone [HAZ]. One of the major reasons for failure of dissimilar welded joints is the untreated left residual stresses. In the present paper a brief description of the ideology of bimetallic weld processes, their capabilities and restrictions, phenomenon and types of σR and their treatment techniques is presented. The overall impact of σR and their measurement techniques have also been discussed. Application/Improvements: There are numerous applications of dissimilar metal joints such as in automotive industry, power generation industry etc.