<p>A descaling roller is a significant component in the field of iron and steel metallurgy. Failure is prone to be caused by the harsh working conditions such as high-pressure water erosion and billet dynamic impact. A variety of human resources, material, and financial resources will be consumed by the frequent replacement of the descaling roller. To improve the service life of the descaling roller, 30%WC and 60%WC were added to the basic formula of Ni-based flux-cored wire (Ni-Cr-B-Si) by this study, and flux-cored wire was made through the flux-cored wire production factory. Finally, submerged arc welding experiments were performed on the descaling roller. The scanning electron microscopy, x-ray diffraction, energy-dispersive spectroscopy, hardness, and friction wear tests were performed to reveal the material characteristics of the surfacing layer. Finally, based on the optimal ratio of wire material, the Ni/WC60 multi-field coupling numerical simulation was performed. The evolution law of temperature field, stress field, and molten pool flow field was revealed. This study realized the whole process experiment of powder making, flux-cored wire making, welding test, post-welding evaluation, and forming mechanism. The effect of different WC contents on the performance of the surfacing layer was quantitatively analyzed. This has significant practical reference and application value for submerged arc welding nickel-based WC flux-cored wire on the descaling roller, and theoretical support is provided for the surface repair and strengthening of the descaling roller.</p>