<p>This work investigates the effect of laser cladding parameters (laser power, scanning speed, and nozzle stand-off distance) on the defects, microstructure, and microhardness of Hastelloy X coated by NiCoCrAlY powder. The optical microscope images show defects in the cladding zone, including lack of adhesion and gas porosity. The clad zone consists of three microstructures: cellular, columnar, and equiaxed. The results indicate that cell size and primary dendrite arm spacing decrease with increasing the scanning speed, stand-off distance, and decreasing the laser power. Energy-dispersive spectroscopy analysis conducted in the clad zone reveals the presence of the β-NiAl phase in the dendritic region and the γ-Ni phase in the interdendritic region. These phases are confirmed through X-ray diffraction analysis. The microhardness results indicate that a reduction in the heat input leads to an increase in the microhardness of the clad zone. This phenomenon can be attributed to a refined microstructure.</p>