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Heat Treat - Hardness Verification
Eddy current technology is the answer to a variety of manufacturing quality challenges. With eddy current equipment from Criterion users can test metal components, magnetic and non-magnetic bar, tubing, and wire products to identify physical, structural and metallurgical conditions.
Frequency selection is vital when performing case depth analysis because high frequencies do not penetrate far beneath the surface and low frequencies wil not necessarily detect surface condition variations. The InSite uses multi-frequency configuration to test parts thoroughly at the surface and beneath.
Just as variations in material structure will influence eddy currents, physical differences in a product encountered at the surface will cause a disruption to the eddy currents. Special filtering and custom coils from Criterion help improve signal to noise ratios and test sensitivity.
Eddy Current systems verify acceptable thread and spline features. Vision systems are expensive and cannot view 360 of the threaded area simultaneously. Manual thread gauge inspections are labor intensive, not completely reliable and subject the product to potential damage.
Powder Metal component manufacturers can perform 100% heat treat inspection on complex components. This case study shows the correlation between Rockwell testing and an in-line eddy current testing system.
Eddy Current is well suited to finding defects in metallic tubing. This case study shows how a hypodermic needle manufacturer uses eddy current testing to inspect 100% of their needle stock in-line in real-time just prior to cutting into individual needles.
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