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Non-destructive Testing | DeltaQ Consultants

Magnetic Particle

DeltaQ Consultants:

Magnetic Particle inspection is a non-destructive testing process for detecting surface and slightly subsurface discontinuities in ferroelectric materials such as steel, iron, cobalt, nickel, and some of their alloys. The process places a magnetic field into the test object and once the object is magnetized, flaws perpendicular to the magnetic field direction cause flux leakage. If a discontinuity or a crack is present the magnetic particles will be attracted to the area, providing an indication that can be assessed by location, size, shape and extent.

Liquid Penetrant

Liquid Penetrant inspection is one of the most widely used NDE/ NDT methods because it can be used to inspect almost any material. DeltaQ Consultants utilizes Liquid Penetrant inspection to detect surface discontinuities in both ferromagnetic and non-ferromagnetic materials. In castings and forgings, these may be cracks or leaks in new products or fatigue cracks detected within in-service components. We perform the test using visible red dyes under visible light conditions or fluorescent dyes under ultraviolet light. As the name implies, the dyes penetrate into the surface discontinuities by capillary action. After the excess material is removed from the material being tested, indications will appear. Evaluation and classification of material is based on code or customer requirements.


DeltaQ Consultants:

Ultrasonic testing uses high frequency ultrasonic waves to detect surface breaking and internal imperfections and defects, measure material thickness and determine acceptance or rejection of a test object based on a client’s preferred reference code or standard.

Ultrasonic Thickness Testing measures remaining wall thickness on piping, pressure vessels, storage tanks and other materials, and can be used to scan bolts, shafts and raw materials for imperfections. A straight beam is directed at the test piece and, utilizing the round trip time for the ultra- sonic energy, the distance to the flaw is displayed in thousandths of an inch. On UT units with A-scan, the display will show multiple flaws at different depths.

Shearwave Ultrasonics or A-scan Testing transmits an ultrasonic wave at a predetermined angle into the test material. Surfaces normal to the beam path and corner traps reflect the wave energy back to the transducer. The display shows the distance the wave traveled to the imperfection and the relative strength of the energy.

Internal Rotating Inspection System inspection detects defects and measures wall loss of both ferrous and nonferrous tubing. It provides information about the geometry of identified defects while accurately measuring local defects and wall loss on both the inside and the outside of a tube. Defects under support plates are easily detected and quantified as well.

Time of Flight Diffraction is used for inspecting and sizing defects in welds with two angled probes (one on each side of the weld) to transmit sound waves into the test material at angles specific to its thickness. Discontinuities are shown as breaks in the waves or as additional waves between mode lines.

Phased Array Ultrasonic Testing provides sharper detection capability for off-angle cracks, and is capable of displaying multiple presentations simultaneously by applying computer controlled excitation to individual elements in a multi element probe. By varying the timing of the excitation, the sound beam can be swept through a range of angles. The shape of the beam may also be modified to a specific focal distance or spot.

Automated Ultrasonic Testing Systems use different technologies from several manufacturers to provide complete automated inspection capabilities. Technologies employed include TOFD, Pulse Echo, Corrosion Mapping and Phased Array. This non-destructive inspection process enables us to screen piping and vessels. The client is provided with a true representation of the test material, which speeds the process of defect interpretation. All data is digitally recorded and scans are exactly repeatable for long-term monitoring purposes.

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