Patent ID: 8681923

Claim:
A method of manufacturing a core shroud for a nuclear power plant, the method comprising steps of: setting a narrow groove between abutting surfaces of first and second metal members adjacent to each other, each of the first and second metal members having a respective thickness not less than 30 mm, with a root face on each of the abutting surfaces, each root face having its length which is between 25% and 95% of a thickness of a thinner one of the first and second metal members; and laser welding the abutting surfaces with a welding wire to construct the core shroud, the laser welding being performed in a shielding gas including nitrogen, wherein the welding wire comprises an austenitic stainless steel including a ferrite content of 14-20% calculated from the material composition of the welding wire, and a ratio between Cr in the austenitic stainless steel and Ni in the austenitic stainless steel is 1.9-2.2.