Analysis and Optimization of Parameters of Dissimilar Metal Welding

Nishad Naduthodi; Hassan Kutty; Shaimil Fithu; Vignesh P

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Analysis and Optimization of Parameters of Dissimilar Metal Welding

Author(s):

Nishad Naduthodi , Department of Mechanical Engineering MEA Engineering College, Kerala, India; Hassan Kutty, Department of Mechanical Engineering MEA Engineering College, Kerala, India; Shaimil Fithu, Department of Mechanical Engineering MEA Engineering College, Kerala, India; Vignesh P, Department of Mechanical Engineering MEA Engineering College, Kerala, India

Keywords:

MIG, Butt-Joint, Dissimilar Welding, Mild Steel, Stainless Steel, Mechanical Property

Abstract:

The aim of our work is to study the hardness that affects the welding joint of dissimilar metals and what are the parameters that attects the welding strength of dissimilar metals. Stainless Steel 304 was welded to mild steel using a metal inert gas welding which also known as gas metal arc is welding with the help of filler wire of stainless steel and also by electric arc welding. Argon gas was used as shielding gas in this process. Dissimilar metals welding have great scope in advanced technology nowadays owing to their high hardness, high strength and corrosion resistance properties. The welding voltage had a significant effect on the welding process, as higher voltage resulted in poorer appearance of the weld joint and led to defects for both type of samples, such as porosity and incomplete fusion. The hardness values of the welded seams in all the samples range from 249 to 292 HV in Vickers hardness and 29 to 37 HV in Rockwell hardness test, respectively. The fracture in the tensile test yielded the highest tensile strength of 489.1MPa for MIG welded specimen with ER304. The tensile strength of MIG Welded test sample has higher range of tensile strength than electric arc welded specimen. Based on the investigation throughout this study, it can be concluded that the welding voltage had a significant effect on the welding process.