STAINLESS STEEL ALLOY

Many materials fall into the category of stainless steel alloys, including austenitic, martensitic, duplex, ferritic and other types of stainless steels. These are most easily NDT tested in both tubular form or in bar stock form (long constant cross section).

  • Tubulars can be seamless or welded tubes. Further refinement can be drawn and ground surface. Sizes can range from those for hypodermic needles to >500mm diameter pipes for oil and gas transmission.
  • Bars can be as rolled, peeled or drawn and surface improved.

The two primary methods of testing / inspection are Eddy Current and Ultrasonic.

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MULTIMAC®

Eddy Current Instrument for Testing Tube, Bar, & WireNDT for Stainless Steel Alloy

  • 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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ECHOMAC® FD6

For Flaw Detection, Thickness & Dimensional MeasurementEddy Current technology for testing Stainless steel Alloy Tube
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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ULTRASONIC TECHNOLOGY

High-speed Ultrasonic (UT) Systems enable a full volumetric examination of materials and are designed to detect surface,Ultrasonic testing of Stainless Steel Alloy tubing

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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EDDY CURRENT TECHNOLOGY

MAC’s® Eddy Current Testing (ECT) systems incorporate computer-based test instruments and test coils that use two ECT coil Heat Exchanger Tube non Destructive Tubetechnologies: 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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