PRECISE FABRICATION AND CUTTING OF WALL STRUCTURE TO REPAIR THE THIN END OF PLATE USING INTERLAYER TEMPERATURE MONITORING ON WIRE AND ARC-BASED ADDITIVE MANUFACTURING

Abstract

Inconel 718 has high temperature strength and corrosion resistance, and it is used for turbine blades such as those used in gas turbines. However, turbine blades must be repaired to extend their product life, because they are used in highly heated centrifugal fields, and often experience damage such as cracks, breakdowns, and oxidation thinning. We sought to perform additive fabrication onto the thin end of a plate using WAAM and cutting to repair turbine blades using Inconel 718. We were able to roughly fabricate a wall structure with of the target lamination width of +2 to +3 mm for plate thickness onto a thin end of a plate with a thickness of 5 mm while maintaining a constant interlayer temperature. In addition, we performed cutting to the wall structure onto the thin end of the plate, and showed that additive fabrication can be performed with almost no defect.