Experimental investigations of Hastelloy C-22 weld overlay on SS 316 L using GTAW process

The present study represents a comprehensive investigation of GTAW Process implemented for ERNiCrMo-10 (Hastelloy C-22) weld overlay on SS 316 L austenitic stainless steel. To assess the weld overlay’s performance, visual testing, hardness testing, bend testing, optical spectroscopy for chemical composition analysis, potentiodynamic polarization technique for corrosion resistance evaluation, as well as macro and microstructural observation were carried out. An average corrosion rate of 0.742 mpy for the overlay was achieved owing to uniform distribution. Microstructural study also observed primary and secondary inter-laminar spacing. These phases contribute to improved structural integrity and adequate hardness characteristics. Dilution of 1.5 mm from the base metal was achieved which can be attributed to precise control and minimal alloy mixing, The average spacings between primary and secondary arms were also measured and values of 4.239 μm and 4.559 μm, were achieved. These findings particularly provide invaluable inputs to the considerate industry of petrochemical and pharmaceutical sectors.