Abstract
Recently, some cracks due to thermal fatigue have been founded in aged steam turbine casing. Repair welding after the removal of the deteriorated areas is considered as a potential method for improving the life of such components. So, applicability of the control deposition technique as the repair welding, which does not need post weld heat treatment (PWHT) is examined for Cr-Mo-V cast steel. By conducting tensile, creep, and low-cycle fatigue tests of the welded joint by the control deposition method, it is found that the control deposition technique is applicable to the repair welding for the turbine casings.
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