Semi-finished product for producing a repaired blade for a gas turbine and repair method for repairing a blade for a gas turbine

A semi-finished product for producing a repaired vane for a gas turbine, the semi-finished product comprising:

• a first part;
• a second part firmly attached to the first part;
• and
• wherein the first part includes at least one recess formed therein, into which the second part projects.

A method for repairing a vane of a gas turbine, comprising the following steps:

• providing a first part;
• forming a groove into the first part, the groove having a base, sidewalls and an opening cross-section;
• providing a second part;
• inserting the second part into the first part such that at least one section of the second part projects into the groove between the sidewalls of the groove;
• and
• attaching the first part to the second part such that, after this attaching, the first part and the second part are connected irremovably to one another.

A semi-finished article for use in producing a repaired vane for a gas turbine, the repaired vane having a repaired configuration that is substantially identical to the original configuration of the vane before being damaged, the semi-finished article comprising:

• a vane stub resulting from removal of a damaged portion from a vane for a gas turbine, the vane stub having an initial stub configuration that is different from the original configuration of the vane;
• and
• a repair part having a first section, a second section and a size which is greater than the size of the damaged portion removed from the vane;
• the first section corresponding to a form-fitted repair part area having the original configuration of the damaged portion of the vane before being damaged and removed;
• the second section corresponding to a removal area that is removable by subsequent processing so as to leave the first section and the vane stub with a combined configuration that is substantially identical to the original configuration of the vane before being damaged;
• wherein one of the repair part and the vane stub includes a groove formed thereon, the groove having a base, sidewalls and an opening cross-section;
• and
• wherein at least a portion of the other of the repair part and the vane stub projects between the sidewalls of the groove, and the vane stub and the repair part are connected irremovably to one another.