The Hastelloy X superalloy is a widely used solid-solution Ni-based sheet alloy for gas turbines, aero-engine combustion chambers, and other hot-end components. To investigate the effect of microstructure, especially grain size, on its weldability, bars are homogenized, cold-rolled to thin sheets, recrystallized under different conditions obtain equiaxed microstructures with average sizes ~5 ?m...