No process is exempt from defects, and regular inspection at every stage of the riveting process is required to verify or take corrective measures. A common defect in aging aircraft is the nucleation of cracks from rivet holes. Current non-destructive testing (NDT) techniques include eddy current testing (ECT). Determining the integrity of rivet structural assemblies using this method is quite time consuming when you consider the volume of rivets requiring analysis by an advanced technician, making ECT also user dependent.
With a mandate to push the limits of NDT technology forward by constantly innovating, Eddyfi Technologies now offers a better solution using eddy current array (ECA). This solution is faster, more efficient, and the reliable choice for inspecting rivet holes. Our ECA technology enables high resolution scans of complete rivet hole surfaces in a single pass, so technicians can easily and confidently identify any defects. This technology is also directly applicable for general fastener hole inspection.
During the development of this solution, challenges to overcome were negotiating the varying tight internal diameter (ID) rivet hole geometry, and the fact that EC inspection is very sensitive to edge effects and gap irregularities between material layers. Differential mode is an ideal topology for ECA applications where variations in surface must be null without impacting performance on flaws. This mode provides a high Signal-to-Noise Ratio (SNR) by reducing and eliminating background noise signals. We adapted the mechanical probe design and differential topology to produce a multi-element probe dedicated for rivet hole inspection. A probe shoe with a spring-loaded mechanism conforms to the ID and surface conditions, and the probe rotates 360 degrees to cover the entire length required in one pass.
Taking advantage of our expertise in ECA, Eddyfi Technologies presents the better solution for rivet and fastener hole inspection that offers high performance and lower inspection costs. We help keep all stakeholders of the aerospace sector safe. Contact us to learn more today.