Abstract
This study examines the influence of arc pulsation and ErNiCrMo-3 filler metal on stress corrosion cracking (SCC) in P91 steel weld joints using activated tungsten inert gas (A-TIG) welding. The constant current joint without filler showed the lowest resistance to SCC, while the pulsed current joint with filler exhibited the highest SCC resistance. Arc pulsation reduced chromium carbide precipitates, enhancing microstructural refinement and crack growth thereby increasing tensile strength and SCC resistance. Filler introduced minor austenitic phases inside martensitic microstructure with reduced hydrogen content contributed to increased SCC resistance. The joint fractography among all welds revealed a complete transgranular fracture.
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