Selection of Appropriate Process Parameters for Gas Metal Arc Welding of a Steel under 100% Carbon Dioxide Gas Shield

Gas Metal Arc Welding (GMAW) is a semiautomatic, versatile process that offers high rate of weld metal deposition with all positions welding capability. It can weld different metallic materials to produce quality weld suppressing the problem of moisture and slag entrapment. In the present work, a gas shield of 100% carbon dioxide is provided during joining of typical steel flats. To derive good welded joints, a multi-response optimization problem is formulated to find out optimal parametric combinations. Experimental runs are chosen following Taguchi's L9 orthogonal array (OA). Grey relational analysis is performed on the results obtained to evolve the appropriate condition within the domain of experiments conducted. Finally a set of process parameters is recommended to achieve desired weldability.