Analysis and development of inspection procedures based on Computed Tomography and Digital Radiography on Aerospace Additive Manufactured Parts

Speaker:
Lasagni, Fernando; CATEC - Advanced Center for Aerospace Technologies; Spain

Authors:
Galleguillos, C.; CATEC - Advanced Center for Aerospace Technologies; Spain
Periñán, A.; CATEC - Advanced Center for Aerospace Technologies; Spain
Lasagni, F.; CATEC - Advanced Center for Aerospace Technologies; Spain

ID: ECNDT-0506-2018
Download: PDF

The aerospace industry is increasingly demanding complex geometries to obtain low weight structures. At the same time, Additive Manufacturing (AM) is a powerful technology which allows a high degree of geometrical optimization. However, requirements on the inspection of the entire volume, including inner surfaces, restrict very often the design process. In this context, X-Ray computed Tomography (XCT) is capable to measure both inner (lack of fusion, voids, cracks, etc) and outer indication (cracks and also geometrical deviations). On the other hand, although Digital Radiography (DR) presents reduced information if compared with XCT, this technique can reduce both lead time and costs.
This work presents a detectability analysis by XCT and DR of typical AM defects. The detectability of voids and cracks is investigated on AM samples, including an analysis of the influence of part thickness on the inspection contrast. At the same time, standards for RD inspection have been developed including induced indications fabricated directly by the variation of AM processing parameters (voids) and through design (cracks), which have been contrasted with XCT. Finally, dimensional analyses of complex geometries are presented as well.