To provide a method for weld-coating of a portion of a splash zone in a metallic structure such as a marine structure and a bridge with a corrosion-resistant thin metal sheet.

In the method for weld-coating of a corrosion-resistant thin metal sheet to a surface of a thick base metal, (1) the ends of adjacent corrosion-resistant metal sheets are superimposed on each other, and the end of the upper corrosion-resistant thin metal sheet of the superimposed portion is folded toward the thick base metal side, or (2) the superimposed portion of the ends of the corrosion-resistant metal sheets are welded in advance and the spacing between the corrosion-resistant thin metal sheets is maintained to be ≤0.2 mm. Then only the corrosion-resistant thin metal sheets of the superimposed portion are melted and joined with each other by arc welding.