The purpose of this research study is to investigate the microstructural properties at Heat Affected Zone (HAZ) using Scanning Electron Microscope and to analyze the strength of the welded plates compared to parent metal plates. To carry this research work, mild steel plates (IS 2062) with butt joint using Metal Inert Gas (MIG) are considered. To know the effect on microstructure of the weld portion and strength compared to parent metal, three different thickness plates i.e. 5 mm, 6 mm and 8 mm are considered and welded with but joint at three different input current i.e. 120 A, 140 A and 160 A by keeping voltage constant i.e. 50 V. The results obtained from the different thickness plates are compared to find the optimal thickness and current required.
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