MECHANICAL AND METALLURGICAL CHARACTERISATION OF DOUBLE PULSE MIG WELDED IN 617- SS 304 H

Abstract

ABSTRACT This work attempts to study the mechanical and metallurgical properties of dissimilar welded IN (Inconel) 617-SS (Stainless steel) 304 H plates. Welding was carried out using the Double Pulse MIG Welding Process (DP-MIG) with two different heat inputs, namely 412 J/mm and 452 J/mm. The presence of chromium-rich carbides Cr23C6 helped in strengthening the weld. The tensile strength of the weld made at 452 J/mm was 22% more than that of the weld made at 412 J/mm. Similarly, the weld hardness at 452 J/mm was 8% greater than the weld strength at 412 J/mm. The impact strength did not change significantly with respect to the heat input. Weld made at lower heat input (412 J/mm) had a lack of sidewall fusion. Lower frequency and amplitude contributed to poor heat distribution, leading to a lack of sidewall fusion.