Welding is the process of joining two or more similar or dissimilar metals with or without the application of heat or pressure to the work piece. Mild steel is gathered wide acceptance in the fabrication of pipelines, power plants, refineries, pressure vessels, nuclear reactors, building & bridges, automotive, trucks & trains, ships, offshore structures, aerospace structures and microelectronics. In any structural application, its weldability is of utmost importance as welding is largely used for joining of structural and process equipment components. Ast37 graded mild steel is mostly used for fabrication of pressure vessels which are used in process industries. The preferred welding process for mild steel is frequently arc welding due to its comparatively better strength for the material and better economy. To get better weld strength, many of the process parameters are greatly influenced. Some of mostly influenced parameters are welding current, electrode diameter and welding speed. The output parameters mostly considered are of its tensile strength, hardness and porosity of the weldments.