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Non-Destructive Testing

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Magnetic Analysis Corporation

To maximise the NDT process, you need the right equipment…and the right people. Combining these two things is more than just a strength of Magnetic Analysis Corporation. It’s our signature.

A Name You Can Trust

MAC® provides instruments, systems and solutions that are recognized the world over as THE standard for nondestructive testing (NDT). At the core of our comprehensive portfolio of NDT options are Eddy Current (ECT), Magnetic Flux Leakage (MFL) and Ultrasonic (UT) testing equipment.

Cutting-Edge Technologies And Conveniences

At MAC®, the science of innovation is a critical priority. Recent breakthroughs include the Echomac® Phased Array Test System, the Rotoflux® AC Flux Leakage Tester, the 20mm Rotomac® HS Rotary and the UT Test for Spinning Tube. In addition, our Remote Pre-Acceptance service now enables you to view and approve full operation of your new system from the convenience of your office, which helps to eliminate scheduling conflicts and reduce travel expenses.

Eddy Current Technology in NDT

MAC’s® Eddy Current Testing (ECT) systems incorporate computer-based test instruments and test coils that use two ECT coil technologies: encircling and sector coils, and spinning or rotary probe coils.

Encircling & sector Eddy Current coil tests perform in this manner:

  • The product is passed through or adjacent to an electrical test coil, which has been excited by an alternating current.
  • This induces a flow of eddy currents around the test material or in the case of a sector coil, in the area under the coil.
  • Short, intermittent anomalies or flaws cause a variation in the eddy current pattern, which the instrument detects.

Rotary probe Eddy Current tests perform as follows:

  • The product moves longitudinally through the rotating test probes resulting in a helical search pattern.
  • As the probe passes over a defect, variations in the induced Eddy Current pattern are detected.
  • The minimum flaw length, which can be consistently detected, is a function of the rotary speed of the probe and the throughput speed of the material.
  • Rotary testing is the method of choice for detecting seam type surface defects in non-magnetic and magnetic grades of wire and bar.

Typical applications for encircling/sector ECT sensors are:

  • Detect seam type surface defects in cold drawn wire or cut length bar stock.
  • Inspect in line with continuous wire operations such as wire drawing, parts forming, re-spooling, or straight and cut.
  • Inspect cut lengths, usually off-line.
  • Test parts, such as small shafts and bearings for longitudinal surface defects.
  • Eddy Current technology can be used on ferrous and non-ferrous materials.
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