Thermostructural turbomachine part that is circularly symmetrical about a longitudinal axis, the part including an annular wiper, and a method of manufacture

A method of fabricating an annular wiper on a thermomechanical support, in particular for a sealing labyrinth, the method comprising the following steps:

• a) providing a support with circular symmetry about a longitudinal axis, the support presenting an annular base for the wiper;
• b) providing at least one source of a powder material and a spray nozzle connected to said source and suitable for moving relative to the support:
• c) providing a laser source connected to an optical head suitable for moving relative to the support to focus a laser beam on a point of the surface of the support;
• d) aiming both the optical head and the nozzle at a common point on the surface at the top of the base of the wiper;
• e) activating the laser source and the source of powder material, thereby forming a localized melt at said point, into which the powder material is injected, thereby forming a localized region of increased thickness;
• f) aiming the optical head and the nozzle at another point on the surface at the top of the base adjacent to said localized region of extra thickness, and repeating step e) so long as the layer of material has not been terminated for the angular sector in question, said wiper comprising a plurality of angular sectors each containing a projecting portion;
• and
• g) building each projecting portion of the wiper by depositing successive layers that become narrower in the longitudinal direction on the surface at the top of the base, each layer being the result of performing steps d) to f).