Welding of Dissimilar Titanium Alloys using Laser Blown Powder - Directed Energy DepositionThursday (07.11.2019) 09:15 - 09:35 Part of:
Due to the increasing desire by design engineers to incorporate blisks (BLade Integrated diSKs) into the modern architectures of aero engines to harness their performance benefits, there is a requirement to develop methods of repairing these high value components. One such repair method that has been identified is Laser Blown Powder – Directed Energy Deposition (LBP-DED).
As next generation aero engine architectures incorporate increasing numbers of blisks, the material choice has progressed from the lower temperature capable titanium alloys such as Ti-64 to higher temperature capable alloys such as Ti-6246. It is well understood that more heavily β stabilised α+β alloys such as Ti-6246 are more difficult to weld due to the fine transformation product produced during welding which limits the ductility of the weldment. Ti-6246 is regarded therefore as an alloy that is hard to process by LBP-DED. For this reason, the chemically similar near-α stabilised alloy Ti-6242 is being explored as a repair material for Ti-6246 blisk aerofoils to evaluate whether this alloy can be used to generate acceptable repairs.