抄録
The performance of repair welds on service-aged 2.25Cr-1Mo header using SMAW with post weld heat treatment was experimentally evaluated. Creep rupture life of the repair weldment was almost the same as that of serviceaged base metal and repair weld was not a weak link. The remaining creep rupture life of aged weldment was improved by repair welding. In creep-fatigue test with strain holding, the fully repair-welded specimen showed almost the same creep-fatigue life as that of new weldment, however, the partially repair-welded specimen showed a shorter creep-fatigue life. FEM analysis revealed that the deformation behavior of repair weldment was quite different from that of new weldment and strain concentrated on softened aged metal.
