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Analysis of Heat Affected Zone of Mild Steel Specimen Developed Due to MIG Welding

Praveen Kumar Yadav Md Abbas, and Shishir Patel
Department of Mechanical Engineering, IEC College of Engineering and Technology, Greater Noida

Abstract—The Gas Metal Arc Welding is the most widely used for long continuous welds also it is versatile in nature as spot welds can also be per formed by GMAW. Process requires relatively simple and lesser skilled labors, so it is mostly automated and once welding parameters established it should be possible to produce repeatable welds. It is also called as MIG welding. As there is a great influence of welding conditions on behavior of heat affected zone (HAZ) so the present work investigates the effect of welding condition according to mechanical properties of mild steel and presents the optimum welding condition through the evaluation about the weld ability of mild steel by the welding conditions such as the welding passes, voltage variation, current, variation, and change in thickness of mild steel flats. In order to find out optimum welding condition by the mechanical properties mild steel (0.134% carbon) was selected as a specimen having thickness 5, 8,16mm were prepared for experiment. Specimens were welded in the range of 20-24 Volt, 130-150Amp and test pieces out of theses for test of tension, impact and hardness and micro structure have been extracted. The experimental result revealed that with increase in voltage there is increase in penetration so using the parameters further welding was performed. Results show that with increase in current there is increase in hardness of HAZ and ultimate tensile strength

Index Terms—Heat affected zone, Mild steel specimen, MIG welding

Cite: Praveen Kumar Yadav, Md Abbas and Shishir Pate, "Analysis of Heat Affected Zone of Mild Steel Specimen Developed Due to MIG Welding," International Journal of Mechanical Engineering and Robotics Research, Vol. 3, No. 3, pp. 399-404, July 2014.