Turbine diaphragm airfoil, diaphragm assembly, and method of repair

A turbine diaphragm assembly comprising:

• an inner diaphragm sidewall;
• an outer diaphragm sidewall;
• and
• a plurality of diaphragm airfoils located between the inner diaphragm sidewall and the outer diaphragm sidewall, each of the plurality of diaphragm airfoils having:
• a composite airfoil body having a pressure side and a suction side, the composite airfoil body including:
• a leading edge section forming a portion of each of the pressure side and the suction side;
• and
• a trailing edge section integral with the leading edge section, the trailing edge section including:
• a prefabricated member affixed to the leading edge section, the prefabricated member forming a remainder of the pressure side of the composite airfoil body;
• and
• a weld or braze section contacting the leading edge section and the prefabricated member, the weld or braze section forming a remainder of the suction side of the composite airfoil body and extending from the leading edge section to approximately a trailing edge of the composite airfoil body.

A method of repairing a turbine airfoil in a turbine diaphragm, the method comprising:

• affixing a prefabricated member to the turbine airfoil, the turbine airfoil having a pressure side with a portion missing therefrom and a suction side with a portion missing therefrom, the prefabricated member replacing the portion missing from the pressure side of the turbine airfoil;
• and
• welding or brazing along a suction side of the prefabricated member to replace the portion missing from the suction side of the airfoil,
• wherein the welding or brazing along the suction side of the prefabricated member includes welding or brazing along substantially the entire suction side of the prefabricated member to a trailing edge of the turbine airfoil.