Behaviour of Haz and Weld Bead Under Different Welding Condition for A572 Gr 50 Steel

Gas Metal Arc Welding processes are generally used in almost every industrial segment. The process contain high levels of spatter generation, the wandering of the welding arc and the consequent waviness of the weld bead. The mechanical properties around heat affected zone (HAZ) and the weld bead geometry are greatly influenced by the welding parameters. In the present study, the influence of the heat input variation on the weld bead geometry and the heat affect zone has been analyzed. Taguchi based Orthogonal Array (L9) methodology was employed to optimize the process parameters i.e. welding current, gas flow rate and the welding speed. The weld quality has been assessed in terms of tensile properties of weldments such as micro-hardness, yield strength and ultimate tensile strength. The results revealed that combination of parameters had significant effect on micro-structural feature of welded structure and hence weld strength.