Eddy current testing is an electromagnetic technique and can only be used on conductive materials. Its applications range from crack detection, to the rapid sorting of small components for either flaws, size variations, or material variation. Commonly it is used in the aerospace, automotive, marine and manufacturing industries.
When an energized coil is brought near to the surface of a metal component, eddy currents are induced into the specimen. These currents set-up magnetic field that tend to oppose the original magnetic field. The impedance of coil in close proximity to the specimen is affected by the presence of the induced eddy currents in the specimen.
When the eddy currents in the specimen are distorted by the presence of the flaws or material variations, the impedance in the coil is altered. This change is measured and displayed in a manner that indicates the type of flaw or material condition.
The IRIS 9000 is a technologically advanced system, positioned to respond to the growing need for accurate, timely, inspection results. A strong commitment to quality is evidenced by our attention to design and function.
Iris Inspection keeps pace with the technology curve, updating the system and offering valuable enhancements as they become proven. The company's growth is solid proof of its commitment to provide customers with the specialized knowledge and resources needed when they are faced with a run or re-tube decision.
Ultrasonic phased arrays are a novel technique for generating, receiving and imaging ultrasound. Instead of a single transducer and beam, phased arrays use multiple ultrasonic elements and electronic time delays to create beams by constructive and destructive interference. As such, phased arraysoffersignificant technical advantages for weld testing and plant monitoring over conventional ultrasonic as the phased array beams can be steered, scanned, swept and focused electronically from a fixed probe position. Beam steering permits the selected beam angles to be optimized ultrasonically by orienting or focusing them perpendicular to the predicted discontinuities, for example lack of fusion in automated weld inspections.
TOFD and its principles are well documented. Utilizing diffracted energy in the detection of flaws, the technique is less reliant on flaw orientation and morphology than standard pulse echo techniques, leading to improved sizing and probability of defect detection (POD). Additionally, computerized electronic data capture and storage, in conjunction with scanning manipulators enable rapid scanning speeds to be achieved TOFD hasnowbeen accepted as an alternative to Radiography in Pre-Service Inspections with standards such as ASME 2235, and its use in pipe weld and thick walled pressure vessel fabrication is now common place. Due to it’s sensitivity and sizing accuracy, TOFD is also an excellent tool for in-service material and flaw monitoring. Engineers who are monitoring root erosion, stress corrosion cracking, vessel cladding, Hydrogen Attack, Weld and Steam Chest cracks for example, are all now utilizing TOFD as part of an ongoing inspection regime. Integrity NDT personnel have over 10 years of experience in planning, managing and carrying out TOFD on pre-service and in-service projects, around the globe. We can advise and develop TOFD procedures and have developed specialist scanning equipment for carrying out inspections.
MFL is a magnetic method of nondestructive testing that is used to detect corrosion and pitting in steel structures, most commonly pipelines and storage tanks. The basic principle is that a powerful magnet is used to magnetize the steel. At areas where there is corrosion or missing metal, the magnetic field"leaks" from the steel. In an MFL tool, a magnetic detector is placed between the poles of the magnet to detect the leakage field. Analysts interpret the chart recording of the leakage field to identify damaged areas and hopefully to estimate the depth of metal loss. This article currently focuses mainly on the pipeline application of MFL, but links to tank floor examination are provided at the end.
Long Rate UT is method that uses UT wave torsion and transverse to detect long area until effective to pipe inspection in difficult reach area such as: pipe rack, crossing road, insulation pipe, buried pipe, bridge crossing, etc.