Security tagging has been shown to be applicable in metals 3D printing, and as the technology shifts from prototyping to production, the need for protection against counterfeiting grows. Previous work in security tagging used a multi-material directed energy disposition (DED) printer, hiding taggant tangent chemicals in just below the surface of the build. The invisible taggant is then detected using a non-destructive evaluation technique, x-ray fluorescence spectroscopy. Currently, the penetration depth for the detector is less than 1 mm. This limits tagging to surface or near-surface layers. Thus, machining is a concern. Preliminary experiments suggest that machining may affect the detectability of the taggants, but not enough to disrupt the usefulness of the tagging technique. In the work reported here, we address the compatibility of tagging and machining, and attempt to quantify the tolerances.
- Describe a security tagging option usable in DED printing
- Report machining challenges and mitigations for use in security tagging for metals AM