Argon and argon-hydrogen shielding gas effects on the laves phase formation and corrosion behavior of Inconel 718 gas tungsten arc welds

[Display omitted] Argon-Hydrogen shielding gas mixture induced a steep temperature gradient and enhanced the instantaneous cooling rate of the weld. The welds obtained by Argon-Hydrogen have finer grain structure than the Argon-Shielded welds. The reduction of laves phase segregated at the interdendritic region has lower Niobium concentration which improves the corrosion resistance of the welds.