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Teboho Molokwane

Weldability limits for creep aged material are dependent on the microstructure (precipitates and damage / dislocations), the welding processes applied and the intended operation time and conditions. The effect of the base metal microstructure on the properties of the welded joint will be studied in detail using state of the art techniques (SEM, TEM /STEM etc.). Simulation data for creep life estimates of X20 creep aged welded joints will be obtained from creep tests performed using specimens sectioned from welded joints. The weldability limit will then be determined for creep aged X20 material.