ADVANCED NDT SERVICES

Advanced Services at XCEL NDT covers some of the most technologically advanced inspection methods in the NDT industry. These methods include Ultrasonic Shearwave Testing, Automated Corrosion Mapping, Phased Array Ultrasonic Testing, Time of Flight Diffraction, Automated Weld Inspection, Positive Material Identification (XRF), and Positive Material Identification/Carbon Equivalency Testing (OES/CE). These methods are utilized to perform some of the most critical inspections and can provide extremely accurate results. XCEL believes that investing in these top end inspection techniques is critical to future success for the company.

Ultrasonic Shearwave testing utilizes high frequency sound energy to inspect welds and materials with extreme accuracy.  This method of inspection is very safe to be around and can provide a full volumetric examination on most full penetration welds.  By utilizing angle beam transducers and wedges, not only can the welding discontinuities  be detected, but they can be sized in length, through-wall height, and also depth.  This information can be very helpful during the repair process if defects are found to be out of the applicable construction codes.

Two of the biggest advantages to this technique are:

  • the safety factors of utilizing the ultrasound to perform the volumetric examination in lieu of radiography
  • the ability to accurately determine the depth and size of any discontinues that  require repairs to be made

By utilizing automated scanning systems corrosion mapping can be taken to a whole new level of accuracy and dependability.  AUT corrosion mapping utilizes the basic principles of manual ultrasonic thickness examination and corrosion mapping, but adds the automated scanning system that records all data collected into a digital file that can be saved for future referencing and analysis.  What use to be very time consuming can now be done in minutes with the use of the computerized analysis programs available in the AUT market.

Two of the biggest advantages to this technique are:

  • the ability to map corrosion, and other laminar defects, with much precision and in a timely manner
  • the ability to save this data for future analysis so comparisons can be made when corrosion rates or growth rates are required

ShearwavePhased Array Ultrasonic Testing is a rapidly growing advanced services inspection method.  Phased Array testing is one of the most powerful UT inspection methods and can be used in pretty much any application where conventional ultrasonic testing is used.

The use of a Phased Array system allows for the UT beams to be steered and focused with a single transducer assembly.  Beam steering allows for the UT technician to inspect the test pieces quicker and with fewer total transducers compared to the conventional technique.  PAUT’s abilities to be focused also allows for very accurate sizing when it comes to critical defects for volumetric inspections.  <br/>

Two of the biggest advantages to this technique are:

  • the ability to reduce the technicians number of transducers
  • the ability of PAUT systems to save the examination data in digital format

Time of Flight diffraction method is a sensitive and accurate method for the non-destructive testing of welds for defects.  Measuring the amplitude of reflected signal is a relatively unreliable method of sizing defects because the amplitude strongly depends on the orientation of the crack. Instead of amplitude, TOFD uses the time of flight of an ultrasonic pulse to determine the position and size of a reflector.

PMI is the analysis of a metallic alloy to establish composition by reading the quantities by percentage of it constituent elements.

This testing is used on ferrous materials to determine various properties of the alloy.  On welding, equivalent carbon content (C.E) is used to understand how the different alloying elements affect hardness of the steel being welded. This is then directly related to hydrogen-induced cold cracking, which is the most common weld defect for steel, thus it is most commonly used to determine weldability.

The Brinell Harness Test uses a hardness steel ball indenter that is pushed into the material under a specified force.  The diameter of the indentation left in the source of the material is measured and a Brinell harness number is calculated form the diameter.  The value of the inspection device is to detect certain differences in material when they arise even though these differences may be undefinable.

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