An objective of the present invention is to certainly repairon site a crack generated to a surface of a cast steel member dueto thermal stress. In the present invention, apart including thecrack 12 at a surface 11 of the cast steel member is removed toform a recess 15, a first repair member 20 that is made of a metal(such as a pure nickel member) that is more flexible with respectto the cast steel member and that is weldable to the cast steelmember is fit into the recess 15 and the first repair member 20that was fit in is welded to the cast steel member by spot welding.Further, a strip-form second repair member 30 that is made of ametal that is more flexible with respect to the cast steel memberand that is weldable to the cast steel member is welded in a mannerintersecting a lengthwise direction of the crack 12 and spanningover the first repair member 20 that was fit in.
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