Repair and Rejuvenation

Gas turbine blades and combustion chambers work under hard conditions, including high temperature and high stress. this working conditions bring different types of damage, such as foreign object damage, rubbing, high Strain low cycle Fatigue, high cycle fatigue, creep, oxidation, erosion, etc. these failure mechanisms cause several types of damages like coating removal, pits and cracks, micro-structure degeneration or creation of creep voids. hot section blades are among the most expensive parts in gas turbines. extending their lifetime is economical. this process is consisted of several steps:

♾ Recording
♾ Cleaning
♾ Visually inspection
♾ Dimensional control
♾ Coating striping
♾ NDT test
♾ Recording defect size and location
♾ Blending surface
♾ Welding or brazing
♾ Apply coating
♾ Visually inspect coating
♾ Controlling micro-structure and designing heat treatment cycle
♾ Heat treatment to restore the metallurgical and mechanical properties
♾ NDT test
♾ Checking micro-structure
♾ Dimensional control
♾ Perform final inspection