Method of making a hollow blade for a turbomachine having a release material after welding

摘要

The procedure for fabricating a blade for a turbine engine involves using computer assistance, for providing a digital simulation to construct the flat components of the blade. The elementary pieces of the blade are forged and machined. A diffusion barrier layer is then applied to the blade, in order to determine the final internal geometry of the blade, and the components are assembled using a diffusion welding process under iso-static pressure. The components are then inflated under gas pressure in order to form the blade shape, in a super-plastic mode, prior to final machining. The process also includes an additional complementary stage of un-gluing parts of the blade structure internally, with this region being defined by the diffusion barrier layer applied previously. The un-gluing process enables the formation of internal cavities in the blade structure.