Non-Destructive Testing

Non-Destructive Testing (NDT) and Evaluations (NDE)

MTI has Level I-III NDT personnel certified for ultrasonic, magnetic particle, dye penetrant, radiography, and visual inspection. These professionals conduct tests and inspection on aircraft frames to pipelines and from locomotive assemblies to complex steel erection. MTI has some of the most highly trained ASNT certified technicians with a full range of equipment, to include a mobile radiography laboratory. In addition, MTI has ground penetrating radar and other equipment to conduct non-destructive evaluations on soils, concrete, or about any material used in the construction process.

  • Ultrasonic Testing - Ultrasonic methods of weld testing use beams of sound waves (vibrations) of short wavelength and high frequency, transmitted from a probe and detected by the same or other probes. This method is utilized for detection of internal flaws in welds such as slag inclusions, internal porosity, or internal cracks.

  • Magnetic Particle Inspection - This method involves magnetizing a specimen using a magnet or by producing a magnetic field by inducing an electric current in the specimen. This method is utilized for the detection of surface or slightly subsurface defects in ferromagnetic material.

  • Liquid Penetrant Inspection - This method employs a penetrating liquid, which is applied over the surface of the component and enters the discontinuity or crack. This method is utilized for the detection of surface flaws in welds that may or may not be visible.

  • Radiography - Industrial radiography uses an X-ray device or radioactive isotope as a source of radiation. Once the radiographic film or image is processed an image of varying density is obtained. The image of imperfections is identified through density changes and analyzed by a qualified industrial radiographer. After more than a century, radiographic inspection is still the nondestructive method of choice for most projects, whether in the laboratory or in the field. Examples of application of radiographic inspection are:

    • Pipeline welded joint inspection
    • Pressure vessel fabrication quality control
    • Welder qualification testing
    • Structural steel fabrication
    • Detect Discontinuities in weld
    • Determine the extent of corrosion (internal and external)
    • Locate reinforcement bar and conduit
    • Locate post-tension cables
    • Detect Discontinuities in weld

MTI is equipped with mobile equipment for on-site inspection and testing to certify to the highest testing standards on a wide variety of products.

  • Visual Inspection – Visual inspection of welds is one of the most underrated ways to accomplish welding inspections, not to mention it is often the most cost-effective way. It does not require expensive equipment and can be one of the easiest forms of inspection to conduct. Having a highly trained, certified, and experienced individual perform visual inspections can dramatically increase welder performance and can be one of the most proactive methods to ensure quality.

  • Weld Procedure and Welder Performance Certification – MTI has highly trained, certified, and experienced personnel that will check and certify individual welders and their procedures, both in the field and at fabrication shops.

  • Ground Penetrating Radar - MTI offers a full suite of Ground Penetrating Radar (GPR) services for the non-destructive investigation of structures and subsurface soil and rock construction applications include; imaging of rebar in foundation and footings, locating rebar and post-tension cables in concrete walls and slabs and locating coring sites in concrete walls and floors. Using a 1.5GHz antennae for a depth of investigation of 18 inches, concrete structures can quickly and easily be imaged saving time and money. Subsurface applications include the use of a 400 MHz antenna to locate and identify buried tanks, pipes and utilities.

  • Elcometer 3312 Model SH Concrete Covermeter - The Elcometer can locate the position of embedded reinforcing steel, accurately measure the thickness of concrete cover, and estimate the diameter of rebar - a feature not previously available to the industry.  Used in conjunction with our Ground Penetrating Rebar (GPR), MTI can provide very detailed information on rebar and post-tensioned cables to engineers, builders, and concrete coring specialists.  In addition, to being able to locate and measure rebar, using a copper-copper sulfate half-cell wand, the device doubles as a corrosion potentiometer.  In this configuration, a trained technician can identify the presence of corrosion on embedded rebar.  Even when no surface evidence is apparent, the half-cell potentiometer can predict the presence of corrosion based on electrical micro-current within the rebar structure.  Because damage from corrosion does not become apparent until after it's too late, this tool is critical to the proper evaluation of concrete structures.  This Elcometer potentiometer conforms to ASTM C 876-09 and can be used on slabs, walls, elevated decks, and many other concrete elements.   

  • Wireline (Borehole Geophysics) - Using a Mount Sopris Instruments® dual-probe borehole geophysical measurement system capable of 1600 feet in depth with an MGX II data logger, MTI is able to efficiently evaluate the following hydraulic parameters: Background Gamma, Self Potential, Single-Point Resistance, Normal Resistivity (four values), Fluid Resistivity, and Temperature. Used during well drilling to locate water-bearing zones and general lithologic parameters, wireline is the state-of-the-industry technology for evaluating hydraulic conductivity and yield for well pro duction. Most often the technology is used in large-diameter, open hole exploration for irrigation and municipal potable water sources. The probe, however, is roughly two-inches in diameter and can fit into much smaller borings. Using optional, 360°, color camera equipment, MTI can also evaluate and inspect cased borings to evaluate screens and casings and other well problems.

For more information, please contact:

David Cram, P.E.
General Manager/Senior Engineer

Dan King
Eastern Idaho Division Manager