CLADDING METHOD FOR VALVE SEAT AND PRODUCTION METHOD FOR CYLINDER HEAD

Provided is a cladding method for a valve seat in a cylinder head blank 10 including a combustion chamber 13, an intake port 11 or an exhaust port 12 communicating with the combustion chamber 13, and an annular countersunk groove 14 formed in an opening end of the port 11 on the combustion chamber 13 side, the method being for forming a cladding layer 20 by irradiating metal powder supplied in the countersunk groove 14 with a laser beam 30. A gas flow regulating wall 15 is provided, which projects from the countersunk groove 14 to an inner side of the countersunk groove 14 and to the combustion chamber 13 side, gas is sprayed during irradiating with the laser beam 30, and the gas is flown by the gas flow regulating wall 15 from the inner side to an outer side of the countersunk groove 14.