Effect of Welding Process Parameters on Toughness and Microstructure Characterization of IS 2062 Grade A Structural Steel Weldment

In this research article, the effect of welding process parameters such as arc welding current, arc voltage, wire feed speed, and shielding gas flow rate on mechanical and metallurgical properties of IS 2062 Grade A steel bonded by MIG welding was investigated. In this experimental work, parent metal was welded by an ER70S-6 filler wire in the presence of a mixture of 75%Ar+25% CO gases for shielding purpose. The Toughness of weldment was 2 determined as mechanical properties. In metallurgical investigation of the weldment, Optical Microscopy (OM), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) were used. Fracture surfaces of notched toughness specimens were examined after toughness test. From experimental results, it was observed that on increasing the arc voltage, toughness value of weldment decreased and the grain size of microstructure of weldment varied throughout the weldment surface. Microstructure of weldment was also found influenced by the composition of shielding gases.