Verification of Residual Stresses from weld Repair (RESTORE)

Important results from the project

The objective of the project was well met, which was to increase knowledge about LMDp when welding aircraft engine components. The technology enables the repair and restoration of used components. RESTORE has investigated how residual stresses are affected by LMDp by mapping with different measurement techniques for the process steps: LMDp, Heat treatment and Machining. The knowledge within the project will be used in future guidelines and contributed to increased maturity.

Expected long term effects

The project results will be used as a basis for guidelines and enable the establishment of the technology for the repair of larger components. The introduction will take place over a 2-5 year and enable robust repair and restoration of aircraft components. It is an important area as components are expensive and difficult to manufacture today from raw materials. The introduction of this type of welding will therefore have a direct effect on durability, reduce material dependence and cost savings

Approach and implementation

Phase 1 test materials were developed at GKN which consisted of different substrate thicknesses and different process steps. Phase 2, comparative residual stress measurement of the samples was carried out. The results were compared between the techniques to determine the appropriate measurement method.Phase 3, mapping and analysis of the samples after the various process step , which was summarized in a technical report that concluded the impact on residual stresses from the LMDp process.