Abstract
In this study, gas tungsten arc (GTA) and pulsed current gas tungsten arc (PCGTA) welding on Hastelloy X were performed using ERNiCr-3. The welded plates are free from the porosity, inclusion, liquation cracks, and hot cracks. The weld bead profile shows a lower bead width in PCGTA than GTA weldment. The segregations of Cr, Mo, Nb, and Ti were identified in GTA with the development of Fe3Mo3C (M6C), Fe2MoC (M3C), Cr23C6, Cr2Ti, Ni8Nb phases. While in PCGTA, Nb and Ti segregations alone were observed with the formation of phases like Ni3Ti, Cr2Ti, Ni8Nb, respectively. The presence of γ prime precipitate (Ni3Ti) observed in PCGTA improved the ultimate tensile strength (UTS) by 8.56% compared to GTA. The UTS and ductility were found inferior in both the weldments when compared to the base metal. This is due to the precipitation of Ni8Nb phase and the existence of Cr2Ti phase, respectively. The PCGTA weldment also shown improved microhardness by 12.21% and impact energy by 9.78% compared to GTA, respectively. The refined crystallite size and precluded carbide precipitates in PCGTA are responsible for the enhanced properties.
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