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In the research work we evaluated the effect of heat input and PWHT on dissimilar metal joints influencing their mechanical properties and microstructure. Dissimilar metal joints of Mild steel and EN8 are prepared by using MIG welding process. This melting is possible because a sufficient amount of energy transferred per unit time and energy density is supplied to the wire. Tensile strength, impact, hardness was tested and Microstructure was studied. The heat input transferred along the transverse length of the welded joint will affect the entire weldment zone. Across the traverse length the hardness values are used to identify different zones of the welded joint. This heat input is varied with input parameters such as voltage, current and speed of wire. In the present research work heat input is considered as low and high heat input cases. The microstructure and the mechanical properties at different zones of each plate of weldment with low and high heat input cases are analysed with out and with post weld heat treatment

Influence of Heat Input and PWHT on the Microstructure and Mechanical Properties in Dissimilar (IS2062-EN8) Welded Joints