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This research aims at comparing creep properties obtained on welding 2.25Cr-1Mo steel using ER90S-G and ERNiCrMo-3 filler metals by TIG or GTAW process. The samples were preheated at 250 °C for 30 minutes and post-weld heat-treated at 690 °C for 1 hour. The high temperature accelerated creep rupture test of 2.25Cr-1Mo welded samples was investigated over 139 to 315 MPa stress range at temperatures of 550, 600, and 650 °C. The service lifetime of the welded materials can be predicted using the extrapolation of Larson-Miller parameter. Creep surface fracture was investigated using SEM consisted of dimple ruptures and micro-voids coalescence in the fibrous matrix of the intercritical region of HAZ. Similar high-temperature creeps service lives were found in both welded materials.
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