Parametric Study of MIG Welding on Mild Steel (IS-2062 GRADE 2)

Abstract

Metal Inert Gas (MIG) welding is a widely employed arc welding process that uses a consumable metal electrode to produce the weld. MIG welding produces very good quality weld when compared to other welding technologies with precise welding and comparatively little heat affected zone. MIG welding has become a popular choice of welding processes when high quality, precision welding is required at a comparatively lower cost. MIG welding is dependent on various input parameters but in the present work input parameters selected were welding current and weld time because these are the two major parameters which affect the weld quality. MIG welding finds its greatest application in welding both ferrous and non-ferrous metals and thus the most widely used arc welding process. A Taguchi Method (2 factors 3 levels) Design of Experiment (DOE) has been applied in this context to examine different welding defects through various tests like Hardness, Ultrasonography, Dye Penetration Test and tensile testing to examine its effect in each case. Finally using the Taguchi results have been optimized and through experiments and testing the best alternative with minimum welding defects and maximum yield strength and hardness number is reported successfully in the present work.