Abstract
The performance of repair welds on service-aged 2.25Cr-1Mo header using SMAW with post weld heat treatment was evaluated. The creep rupture strength of the repair-welded specimen was almost same as that of the new weldment and repair-welding extended the remaining life of service-aged component under creep condition. In creep-fatigue test with strain holding, the fully repair-welded specimen showed almost the same creep-fatigue life as that of the new weldment, however, the partially repair-welded specimen showed shorter creep-fatigue life. FEM analysis revealed that the deformation behavior of repair-welded specimen was quite different from that of new weldment and strain concentrated on softened aged metal.
