AC FLUX LEAKAGE TECHNOLOGY IN NDT
Until recently, Eddy Current rotaries were commonly used to find surface detects, usually down to 0.15mm or 0.2mm deep. Now, Alternating Field—or AC Flux Leakage—Testing has extended this capability to finding even smaller defects, as small as 0.1mm deep.
Highly sensitive AC technology is especially well suited to test hot rolled black steel bars and rods that have surface conditions which used to make finding shallow defects very difficult, if not impossible.
- AC technology uses two encircling magnetization yokes and alternating current flows.
- Without contact, these yokes magnetize the test material in the transverse direction.
- The magnetic flux is concentrated on the material’s surface and is particularly sensitive to minor surface defects since the operating probe examines a very small portion of the entire surface at any one moment.
- MAC’s® Rotoflux® AC Flux Leakage Tester was designed for use with materials such as hot rolled black bar and can find defects as small as 0.1mm deep.
Superior Technology and Performance:
- The Rotoflux® AC is based on MAC Rotoflux® technology, which incorporates the latest multiplexing and wireless signal transfer features to minimize noise while maximizing sensitivity.
- Provides full quadrature detection to preserve phase selectability, choice of all phase and chord gates, similar to conventional eddy current tester.
- Two surface ride Probe Arrays, consisting of 8 elements each, can cover up to 160mm per rotation.
- Operates up to 900 rpm, depending on product diameter.
- Provides throughput speed of 2.4m/s (480 FPM) with larger diameters requiring slower FPM.
- Models designed to test hot rolled bar from 10mm to 180mm in diameter.