United States of America as Represented by the Administrator of Nasa

The United States of America as Represented by the Administrator of the

Christopher S Domack

Joseph N Zalameda

Robert A Hafley

Eric R Burke

Karen M Taminger

Richard E Martin

Bruce J Holmes

William J Seufzer

Clifford J Obara

Theresa A Butler

Ahmed A Hassan

Glenn L Martin

Brian L Taminger

A method of controlling operation of an electron beam gun and wire feeder during deposition of pools of molten matter onto a substrate to form beads upon solidification of the molten matter. The method includes providing a substrate and a wire source. A molten pool of liquid phase metal is formed on the substrate by melting the wire utilizing an electron beam generated by an electron beam gun. The liquid metal solidifies into a solid phase. A controller utilizes data from a sensor to adjust a process perimeter based, at least in part, on data generated by the sensor.

Process control of electron beam wire additive manufacturing

Systems and methods are provided for the real time inspection of additive manufacturing deposits using infrared thermography. Various embodiments may enable the measurement of material properties and the detection of defects during the additive manufacturing process. Various embodiments may enable the characterization of deposition quality, as well as the detection of deposition defects, such as voids, cracks, disbonds, etc., as a structure is manufactured layer by layer in an additive manufacturing process. Various embodiments may enable quantitative inspection images to be archived and associated with the manufactured structure to document the manufactured structure's structural integrity.

System and method for in-situ characterization and inspection of additive manufacturing deposits using transient infrared thermography

This invention is for a passive laminar flow airfoil which has an upper skin 12 and lower skin 14 joined at a trailing edge 16. A leading edge structure 20, such as de-icing equipment, is joined to the upper and lower skins by interface mechanisms 30 and 35. Generally, the interface mechanisms are forward facing steps, with or without adjacent gaps, shaped and dimensioned to accomplish laminar flow using standard airfoil manufacturing techniques.

Geometries for roughness shapes in laminar flow

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Carrollton, VA, United States of America

Christopher S Domack