A literature review of studies and research has been made in the field of dissimilar metal welding. It has various industrial applications such as in the field of automobile chemical mechanical thermal power generation, nuclear plant. The main purpose of this paper is to review (a) Dissimilar metal welds and aspect of mechanical and metallurgical point of view. (b) Enhancing GMAW Technique. And second, the main objective of present study is to apply the Taguchi method.In this technique, an orthogonal array, signal to noise ratio (S/N)and analysis to variance (ANOVA) are made to study the welding characteristics of material & optimize the welding parameters.