Eddy Current Encircling Coil unit Inspecting SS Welded Tube

There are many welding processes and many tubing configurations and sizes. MAC has extensive experience testing tubes and pipes and we have a large base of testing equipment lines being used to meet the many different ASTM, API, EN, ISO and other industry quality standards and or customer driven quality requirements.

  • The Eddy Current method is the most versatile and cost effective method for testing metallic tubes. Eddy Current technology can be operated over the widest speed range and can in many applications be installed on the production line without any restriction from the production rate. This is the preferred method to detect small, short, incomplete welds, and some subsurface and Inside Diameter conditions in carbon steel or stainless or nonferrous tube.
  • For some critical full body tests, including the detection of long, continuous defects such as incomplete seam welds in tube, and inclusions, voids or cavities, Ultrasonic test systems are recommended.
  • Flux Leakage systems are also available to accurately detect longitudinal and transverse surface defects on the OD and ID of heavy-wall magnetic tubing.
  • Since each testing technology has inherent capabilities and limitations, the optimum test solution for welded tube could be a combined system that utilizes both Eddy Current and Ultrasonic test instruments or other combinations to fit the needed task.

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Eddy Current Instrument for Testing Tube, Bar, & Wire

  • Operates with encircling, sector, or rotary test sensors.Non Destructive Testing Eddy Current
  • 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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For Flaw Detection, Thickness & Dimensional Measurement
in Tube & Bar.FD6 Echomac® Electronics

  • 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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Rotoflux Technology in NDT

Transverse Rotoflux® Rotary, at left, and Longitudinal Rotoflux® at right testing OCTG pipe for transverse and longitudinal defects.

The Best Technology to Detect ID/OD Defects in Heavy Wall Magnetic Tubular Products

  • Detect longitudinal and transverse defects in heavy wall carbon steel to comply with required standards for OCTG pipe.
  • Offers 24 separate channels for longitudinal (LRFX) and 48 channels for transverse (TRFX) defect detection.
  • Using both rotary types together ensures detection of longitudinally or transversely oriented discontinuities such as seams, cracks, holes, pits, scabs, slivers, laps, roll-ins, and weldline defects.
  • Differentiates between OD and ID defects.

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The use of Eddy Current Technology and Equipment in Non Destructive Testing

Series 65 Coil Platform

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 in Non Destructive Testing

Echomac® Rotary Drawing

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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Magnetic Flux Leakage (MFL) nondestructive test systems accurately detect defects in heavy-wall magnetic tubing, including oil country tubular goods (OCTG).

Magnetic Flux Leakage in Nondestructive Testing

Transverse & Longitudinal Rotoflux® 500mm Multi-Channel System

These electromagnetic test methods are also used to inspect high-permeability ferromagnetic metals such as carbon steel bar, plate, wire rope and parts. The method can also be used to detect ferritic inclusions in non-ferritic material.

  • For typical OCTG and other heavy wall tube tests, Flux Leakage technology detects longitudinal and transverse defects as small as 5% on OD and ID, as well as defects within the wall, depending upon material type and condition.
  • MFL inspection uses a DC magnetizing field to create enough flux density to bring the material to near-saturation. A transverse magnetizing field is used to detect longitudinally oriented defects, while a longitudinal field is used to find transverse defects.
  • Surface or internal conditions such as cracks, pits, seams and other defects interrupt the flux field and “leak” beyond the product surface.
  • This leakage flux is detected by flux sensor probes with MAC configured rotary inspection devices which can wirelessly transmit this data to the instrumentation for processing and analysis.

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