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NDT.net Issue - 2016-11 - NEWS
NDT.net Issue: 2016-11
Publication: e-Journal of Nondestructive Testing (NDT) ISSN 1435-4934 (NDT.net Journal)

Phased array inspection (PAUT) of complex geometry welds with use of ISONIC series instruments from Sonotron NDT

Sonotron NDT76, Rehovot, Israel

Sonotron NDT announces the new release of phased array inspection technology applications for the complex geometry welds

Inspection SW packages for ultrasonic phased array (PA) flaw detectors of ISONIC series (ISONIC 2009, ISONIC 2010, ISONIC 3510) relate to the inspection of the straight (Tee) and skewed fillet, TKY, corner, nozzle, elbow, transition welds, lap joints, and the like. Since the first of them were introduced about 6 years ago the nomenclature of the packages and their features has been extended and the performance improved significantly over the years. The inspection is performed through the sectorial or linear scan insonification of the weld and heat affected zone with use of shear or compression waves, whichever fit better to the part shape and material properties.

Prior to the inspection the PA pulser receiver is calibrated in the same manner as regular ultrasonic flaw detector. The shape of the weld to be inspected is entered into the instrument through the simple dialogue; the scan plan is created quickly then through the intuitive routine. For PA probes attached to the wedges with contoured contact faces in order to scan above the curved surfaces the focal laws are corrected automatically. Coupling between the probe and the material is monitored automatically through measuring of the compression wave back wall echo, obtained through implementing of the additional focal law providing emitting and receiving of ultrasonic signal at normal to the scanning surface; whilst implemented the same additional focal law allows detection of the laminations in the heat affected zone. The live indication is provided for coupling losses and laminations found.

Whilst implementing the desired sequence of pulsing receiving cycles following the scan plan created each focal law is characterized by the individually settled focal point and time base; the sensitivity is equalized within entire insonified section of the material through use of the independent mechanisms of Angle Gain Compensation (AGC, sectorial scan) or Gain per Shot Correction (GSC, linear scan) and DAC/TCG acting simultaneously thanks to the unique ability of ISONIC Series PA instruments: the DAC / TCG mechanism is used purely for compensating the dependency of echo amplitude on the material travel distance while the feature of varying Gain per Focal Law voluntarily is utilized just for the forming of easy-reproducible AGC (or GSC) plan. Both the DAC / TCG and AGC (or GSC) plans are created independently on each other with use of the same set of reference reflectors

The whole volume of the material is inspected through the line scanning (either encoded or time based) with PA probe along the fusion line. The homogeneous sensitivity and true-to-geometry cross-sectional coverage and imaging are provided for every position of the PA probe along with 100% raw data capturing and “on-the-fly” C-Scan imaging. On completing the scanning the 3D image of the weld and automatically created editable defect list are available immediately. True-to-geometry imaging allows easy distinguishing between the defects indications and geometry echoes

All PAUT technology applications for the complex geometry welds are fully compatible with the recently introduced VAUT (Video Aided UT) technology

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