A Critical Review on Dissimilar Joining of ASS and FSS

Abstract

Austenitic stainless steel used worldwide in various major industries like chemical, petrochemical and shipbuilding industries but the cost of material is high and it highly affects the producers and end-users. But, Ni price is the prime concerned for various industries as there is a shortage of nickel and nickel price increasing day by day according to the London Metal Exchange (LME). So, the demand for low nickel alloy which might be welded with austenitic stainless steel will be used worldwide in industries that need higher heat input, correct choice of filler material and defect-free joints for high production rate. However various welding techniques like Tungsten Inert Gas (TIG)/Metal Inert Gas (MIG)/Electron beam (EBW)/Shielded metal arc (SMAW)/Submerged arc (SAW)/Electron Beam Melting (EBM)/Resistance Spot/Laser and friction welding are used for welding austenitic with ferritic stainless steel. Apart from different techniques used for welding, the dissimilar welding is advantageous proving beneficial and more popular. However dissimilar welding is not so easy and information regarding this is dispersedly available. In view of this, systematic information for better understanding of this process is needed. This paper attempts a critical review of the process of joining the fundamental difference between ferritic and austenitic stainless steel, effect on a microstructure, mechanical properties and resistance to corrosion in various combinations.