The results of the investigation indicate the welding current to be the most significant parameter controlling the weld tensile strength as well as the nugget diameter. The contribution of welding current holding time and pressure to tensile strength are 61%, 29%, 4% respectively and the contribution of these parameters to nugget diameter are 81%, 17%, 1.7% respectively. Relationship graph have been plotted between tensile strength and nugget diameter with parametric variations according to orthogonal array