<p>XH67MBTЮ superalloy is used extensively in aerospace applications and is subjected to various thermo-mechanical cycles. Weldability studies of these alloys are critical for their successful industrial application. The current study shows integrated micro- and macroscale simulation for optimising the welding process in the XH67MBTЮ alloy. The Gas Tungsten Arc welding process is simulated and validated with experimental results. The microstructure formation inside the fusion zone is simulated by the phase field method. The segregation of elements in the fusion zone is established and shows comparable results with experimental data. The inter-dendritic segregation of elements with respect to the varying solidification conditions was studied via phase field simulation. The Ti segregation map confirms that carbide formation can be modified while modifying welding conditions. The microstructure formation in the Heat Affected Zone (HAZ) is studied by integrating the thermal cycle from macroscale simulation, kinetic calculations and physical simulation. The TEM investigation of the HAZ physical simulated sample shows the formation of Ti-rich (MC type) and Cr-rich (M₂₃C₆ type) carbides. These studies will guide the weldability studies in XH67MBTЮ superalloy with limited experimental trials.</p>