Arc Welding Processes for Repair of High-Performance Titanium-Alloy Components (B06)

• Subject Area: Metallurgical, Thermal and Thermomechanical Treatment of Materials ; Lightweight Construction, Textile Technology
• Term: from 2014 to 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 119193472

The focus of sub-project B6 is the development of repair methods for compressor blisks made from titanium alloys, based on arc processes. Quality maintaining regeneration is achieved by the combination of flux effects and application of seeding agents, as well as by the controlled additive build-up of structures. To enhance the functional properties of blade regions that were regenerated and/or are subject to erosion, a localized surface nitriding using a plasma arc process is part of the investigation. Besides practical welding tests, the work programme includes structural analysis, measurement of hardness and residual stresses, fatigue evaluation, and the implications of observed material properties on the expected service life of regenerated blisks.

• DFG Programme: Collaborative Research Centres
• Subproject of: SFB 871: Regeneration of Complex Capital Goods
• Applicant Institution: Gottfried Wilhelm Leibniz Universität Hannover
• Project Heads: Dr.-Ing. Thomas Hassel; Professor Dr.-Ing. Hans Jürgen Maier