To overcome the issue of repairing mold surface failure

the parameters of the laser cladding Ni/SiC process is optimized using numerical simulation.The different laser currents

scanning speeds and defocusing are adjusted to optimize simulation result of laser cladding.Meanwhile

the influence of the temperature field and stress field also is studied by changing the size of the process parameters.The simulation results show that temperature and residual stress both increase with the increase of laser current and decrease with the increase of scanning speed and defocusing amount.Among them

the influence of laser current and defocusing amount is more obvious than that of scanning speed on temperature field.The influence of defocus on the stress field is more obvious than that of laser current and scanning speed.Experimental verification shows that the maximum horizontal welding residual stress difference is 76MPa and the maximum longitudinal welding residual stress difference is 86MPa.The experimental error within a reasonable range proves the correctness of the simulation results. Finally

the optimized laser cladding process parameters is obtained: laser current is 120A

scanning speed is 60mm/min

and defocus is 50mm.