Projection resistance brazing of superalloys

摘要

Superalloy components are joined by mating a recess formed in one component with a corresponding projection formed in another component along a contact surface. The components are compressed along the contact surface and resistance heat brazed to each other. Current is passed between the components at a selected flow rate and application time until brazing alloy melting occurs along the contact surface, and they are mutually affixed to each other. When repairing a damaged surface portion of a superalloy material component, the damaged portion is removed to form an excavated recess. A repair splice is formed, preferably of a same material with similar mechanical structural properties, having a mating projection with profile conforming to the corresponding recess profile. The splice and substrate are resistance heat brazed under compression pressure until brazing alloy melting occurs along the contact surface, so that they are mutually affixed.

主权项

1. A method for joining superalloy structures, comprising:
forming a recess in a superalloy component substrate having a recess profile defined by the remaining substrate; forming a mating superalloy splice having a splice projection, with a projection profile conforming with the substrate recess profile along a corresponding contact surface; interposing brazing alloy between the recess and repair splice along the contact surface; inserting and capturing the splice within the recess, so that the projection and recess are in abutting contact along the contact surface; compressing the substrate and splice projection together along the contact surface at a selected pressure; conductively contacting the substrate and splice with separate electric resistance brazing electrodes; and passing current at a selected flow rate and application time period through the substrate and splice projection between the electrodes until brazing alloy melting occurs along the contact surface, and ceasing further current flow after the substrate and splice projection are mutually affixed to each other.