The energy required for joining steel segments by using laser welding is relatively very low compared with arc welding, gas welding, or any other conventional welding techniques. Moreover, the rapid cooling may create a significant effect on different regions, such as the fusion zone (FZ), heat affected zone (HAZ), and base metal (BM), and in turn affect different parameters. In this study, the characteristics of the laser-welded joint were investigated by varying laser power, welding velocity and incident angle, and tensile strength. In our, experiments. the microhardness was increased by varying the power of laser welding. The strength of the joint was increased to 549 MPa with 2200 W high power, 30 mm/s velocity, and 80º laser incident angle. By increasing the power and velocity of the laser, the welding gun strength was improved; conversely, the angle of laser incident on the welding location decreased while its strength was increased.

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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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