Assembling titanium and steel parts by diffusion welding
AssigneeSnecma
InventorsRaphael Couturier, Jean-Pierre Ferte, Olivier Gillia, Xavier Firmin Camille Jean Lescure, Bruno Riccetti
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Abstract
A method of assembling together titanium parts and steel parts by diffusion welding, the method interposing two thin layers of niobium or vanadium and copper respectively between a titanium part and a steel part, evacuating the assembly of parts and interposed metal layers, and subjecting the assembly to hot isostatic compression at a temperature lying in a range 900° C. to 950° C. and at a pressure lying in a range 1000 bars to 1500 bars for about two hours. The method can be applied to fabricating turbine shafts for turbomachines.
Claims12
A method of assembling together titanium parts and steel parts by diffusion welding, the method comprising:
- interposing two thin metal layers between a titanium part and a steel part, the two metal layers comprising a thin layer or foil of niobium or vanadium in addition to the titanium and a thin layer or foil of copper in addition to the steel;
- putting an assembly comprising the two parts and the two interposed metal layers under a vacuum;
- subjecting the assembly to hot isostatic compression at a temperature lying in a range 900° C. to 950° C., and at a pressure lying in a range 1000 bars to 1500 bars, the hot isostatic compression being followed by controlled cooling;
- and
- subsequently subjecting the assembly to heat treatment during which the assembly is maintained at a pressure in a range 1000 bars to 1500 bars.
Dependencies are inferred from the claim text.