Dissimilar Welding of AISI 304 and AISI 310 Steels Using Metal Inert Gas Welding

Abstract

Thermal, mechanical and chemical properties decides the quality of welding dissimilar metals, as controlling of welding variables is difficult to achieve the desired output of weld joint. Welding of dissimilar metals is a difficult task, as one has to take care of the metallurgical changes taking place in both the metals due to heat produced during welding. Proper selection of welding variables plays an important role in obtaining sound weld joint. Austenitic stainless steel plates of AISI 304 and AISI 310 are welded by MIG welding. Three factors namely filler wire feed rate, welding current and edge included angle are taken as input variables of welding. Grain size and hardness are the output variables. Fifteen combinations of experiments are conducted by considering Box Benhken Design for three factors and three levels. The effect of welding variables on grain size and hardness of the welded joint was studied. The welding variables were optimised using Response optimizer for minimum grain size and maximum hardness of weld joint.