METHOD OF WELDING SINGLE CRYSTAL TURBINE BLADE TIPS WITH AN OXIDIATION-RESISTANT FILLER MATERIAL

摘要

A method for depositing material on a turbine airfoil (18) having a tip wall (34) extending past a tip cap (36), wherein the tip wall (34) includes a first alloy with a single crystal microstructure. The method includes: depositing a second alloy on at least a portion of the tip wall (34) to form a repair structure, wherein a high temperature oxidation resistance of the second alloy is greater than a high temperature oxidation resistance of the first alloy, and wherein the repair structure has a crystallographic orientation that is substantially the same as a crystallographic orientation of the tip wall (34).