Testing Billets

Ultrasonic Phased Array:


MAC can offer Phased Array technology to allow simple testing of both round corner square billets and large round billets. MAC has a unique Phased Array cassette system that allows quick change between the two major geometries (round or square). The transducer assemblies follow the product surface and allow the testing to be optimized relative to the bar center.


Eddy Current/Ultrasonic Multi-Test:


MAC can supply a combined Eddy Current and Ultrasonic system for inspecting hot rolled square and round billets up to 9” (228.6mm) in diameter.


  • The 8-channel eddy current test uses both sector and rotary test probes to spot defects on the flat surfaces and corners. Square or round corner billets can be tested.


  • The UT system can be Phased Array or conventional array type testing. The UT method detects internal defects and makes it possible to volumetrically inspect large bar product.


  • These tests meet MIL STD 2154 standards.


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Echomac® FD-6

For Flaw Detection, Thickness & Dimensional Measurement
in Tube & Bar

  • Versatile Ultrasonic tester with superior performance and versatile, intuitive operation.
  • For full inspection of tubes, pipes and bars, plate and weld.
  • Operate on or off line
  • Upgrade and/or replace older ultrasonic testers
  • Use with rotary, spin-the-tube, squirter and bubbler installations.

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Eddy Current Instrument for Testing Tube, Bar, & Wire


  • Operates with encircling, sector, or rotary test sensors
  • Up to eight test channels, null or absolute, can be used in any combination.
  • Detect short surface and some subsurface defects in tube, bar, and wire.
  • Inspect welded tube for short ID or OD defects in the weld zone.

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Eddy Current

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 and 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.

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Ultrasonic Technology

High-speed Ultrasonic (UT) Systems enable a full volumetric examination of materials and are designed to detect surface, subsurface, internal and dimensional flaws.

This type of testing utilizes high-frequency sound waves that are transmitted throughout the material being tested in order to conduct a thorough inspection.


  • Ultrasonic inspection can be used to detect surface flaws, such as cracks, seams, and internal flaws such as voids or inclusions of foreign material. It’s also used to measure wall thickness in tubes and diameters of bars.
  • An ultrasonic wave is a mechanical vibration or pressure wave similar to audible sound, but with a much higher vibration frequency. For NDT purposes, the range is usually from 1MHz to 30MHz or higher.
  • Depending on the test requirements, these waves can be highly directional and focused on a small spot or thin line, or limited to a very short duration.
  • Two methods of UT are used for flaw detection – Shear and Compression Wave.

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Phased Array

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.

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