Repair welding procedure for cracked turbine blades, made of 13Cr-2.6Ni-1.1Mo martensitic stainless steel, has been developed using gas tungsten arc welding process and a twin wire filler metal. The twin wire consists of a 1.5 mm diameter ER 16-8-2 and a 2.0 mm diameter ER 410 filler wires tack welded along the length of the two filler wires. A two stage post-weld heat treatment at 675 degrees C for 2 h and 615 degrees C for 4 h, such that the first heat treatments is above the Ac-1 temperatures of the weld metal and the second is just below its Ac1 temperature; has been found to be suitable for obtaining good mechanical properties for the weldment. The weldment has a good combination of transverse weldment strength and weldmetal toughness, with its room temperature yield strength and Charpy V notch impact toughness being similar to that of the turbine blade material.
|Journal||Science and Technology of Welding and Joining (Online Edition)|
|Publication status||Published - 2008|
- Impact toughness
- Repair welding
- Turbine blade
- Twin wire filler metal
- Two stage post-weld heat treatment