| 摘要 |
The purpose of the present invention is to reliably repair, in the field, cracks arising on the surface of a cast steel member because of thermal stress. In the present invention, part of a surface part (11) of a cast steel member, including a crack (12), is removed and a recessed part (15) is formed. A first repair member (20) (a pure nickel member or the like) formed from a metal that is softer than the cast steel member and weldable with the cast steel member is fitted in the recessed part (15), and the fitted first repair member (20) and the cast steel member are joined by spot welding. In addition, a band shaped second repair member (30) formed from a metal that is softer than the cast steel member and weldable with the cast steel member is welded so as to cross the longitudinal direction of the crack (12) and to straddle over the fitted first repair member (20). |
