Method of repairing a stationary shroud of a gas turbine engine using plasma transferred arc welding

A method for repairing a high-pressure stationary turbine shroud of a gas turbine engine, comprising the steps of

• furnishing the high-pressure stationary turbine shroud that has previously been in service, wherein the high-pressure stationary turbine shroud is made of a base metal;
• thereafter
• removing any damaged material from a flow-path region of the high-pressure stationary turbine shroud to leave an initially exposed base-metal flow-path surface;
• thereafter
• applying a base-metal restoration overlying the initially exposed flow-path surface, the step of applying including the steps of
• furnishing a source of substantially the same material as the base metal, and
• depositing the source overlying the initially exposed base-metal flow-path surface of the high-pressure stationary turbine shroud by plasma transferred arc welding to form a repaired base-metal flow-path surface;
• and thereafter
• applying an environmentally resistant rub coating overlying the base-metal restoration.

A method for repairing a high-pressure stationary turbine shroud of a gas turbine engine, comprising the steps of

• furnishing the high-pressure stationary turbine shroud that has previously been in service, wherein the high-pressure stationary turbine shroud is made of a base metal;
• thereafter
• removing any damaged material from a flow-path region of the high-pressure stationary turbine shroud to leave an initially exposed base-metal flow-path surface;
• and thereafter
• applying a base-metal restoration overlying the initially exposed flow-path surface, the step of applying including the steps of
• furnishing a source of substantially the same material as the base metal, and
• depositing the source overlying the initially exposed base-metal flow-path surface of the high-pressure stationary turbine shroud by plasma transferred arc welding to form a repaired base-metal flow-path surface.