Corrosion

Ultrasonic Testing

The most common tool for measuring remaining metal thickness in corroded pipes, tubes, and tanks is a hand-held ultrasonic thickness gage with a dual element transducer. Testing can normally be performed at high temperatures (up to 500° C) when necessary, without interrupting processes. Ultrasonic gauges are also effective on heavier structures like bridge beams, support pilings, and ship hulls. More sophisticated instruments including phased array systems can be used with manual or automated fixturing to generate cross-sectional profiles (B-scans) of corroded parts.


Eddy Current Testing

Eddy current instruments including eddy current arrays are used extensively to detect corrosion in critical aircraft structures, including hidden corrosion between metal layers. This technique is gradually replacing the use of radiography, which is time consuming and requires safety precautions. Eddy current array technology is being developed to scan larger areas of the aircraft to detect areas of general corrosion. Eddy current technology can also be used in many other corrosion applications allowing for a large area inspection that is quick and recordable.

Remote Visual Inspection

Videoscope or Remote Visual Inspection equipment is the first choice to find corrosion and condition of piping inside or hidden area since true color image information is the simplest and easiest way to judge the condition. The unique 3D Stereo measurement employed in the IPLEX videoscope systems can quantify the corroded area and pit depth.

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Welding

Ultrasonic Testing

Weld inspection has historically been the single most important application for ultrasonic flaw detectors and phased array systems, and procedures are well established. Most types of common pipeline, plate, and structural welds can be inspected, including butt welds, T-joints, lap joints, nozzle welds, and some types of fillet welds. Phased array systems provide additional capability for imaging and scanned inspection. In the manufacturing environment, automotive spot welds and similar resistance welds can be tested with the aid of specialized transducers.

Eddy Current Testing

Eddy current instruments are being routinely used in conjunction with ultrasound to assess the quality and integrity of welds around the world in several different markets. Specialized probes using a cross-wound coil configuration are employed to make the probes insensitive to lift off (a challenge when inspecting a weld). Eddy current array technologies are being developed to further enhance the inspection capabilities of many of common inspections.

Remote Visual Inspection

Welding inspection of pharmaceutical and food plants is important to ensure the purity of the plants before manufacturing products. Quality and color condition weld bead and residual deposit on the welding can be visually inspected with the true color long videoscopes. The unique smooth coated videoscopes are designed to prevent electropolished purity pipes from surface scratches. In conjunction with Ultra Violet lighting system, fine cracks on welding can be visually identified.