A reliability assessment of the repair weld for the steam-turbine bucket cover was performed. The 410 stainless steel alloy was welded via GTAW (gas tungsten arc welding) with an ER410NiMo filler rod. The welding procedure for the steam-turbine bucket cover was qualified using a tensile test, guided-bend test, and hardness measurement. Two-stage post-weld heat treatment was performed to improve the weld metal toughness. The residual stress was then measured using the indentation test method. The mechanical properties of the welded material were assessed via high- and low-cycle fatigue tests and constant load stress corrosion tests in comparison to the performance of the base metal. The repair weld procedure is demonstrated using an original bucket cover. Finally, a high-speed rotational test of a full-size rotor assembled with a welded bucket cover was performed under steam-turbine start-up and shutdown conditions.