th Middle East Nondestructive Testing Conference , 7-10 October 2012 , Kingdom of Bahrain Phased Array Ultrasonic Testing of Welded Joints in Plastic ( PE ) Pipes
A reliable Non-Destructive Testing approach is required for the inspection of polyethylene (PE) butt fusion joints in various material grades and pipe sizes. The nature of butt fusion joints is that the fusion zone is relatively small and the inspection solutions are often restricted by the existence of an external weld bead. This weld bead restricts the probe placement and the probe needs to be positioned in a non-optimal position for the weld inspection. The PE material grades have low velocity and high frequency dependent attenuation, which will complicate the inspection of thicker pipes. In this paper, phased array ultrasonic techniques are presented and their capabilities are evaluated. The techniques utilise customised water wedges to be able to generate forward angle beams to cover the weld within the PE pipe. Techniques have been developed for pipes with outer diameters between 220-710mm and thicknesses between 14-45mm. Probe and wedge parameters have been optimised for this range of pipes. The capability of detecting circular defects with diameters between 1.5-8mm on pipes with an outer diameter between 220-710mm using a phased array ultrasonic inspection solution, and the challenges overcome when working with this type of material, are presented.
Novel high resolution defect detection for thermoplastic Butt-Welds
Engineers announce a major breakthrough to improve ultrasonic testing of thermoplastic pipeline butt welds.
The evaluation of the competency perception of inspectors in using new instructional technology
Abstract The purpose of this study is to find out the evaluation of inspectors in regards to their competency perceptions towards the use of new instructional technologies. This is a qualitative model research. The target population of this study consisted of 25 inspectors serving within the borders of TRNC in 2011. Data was collected by an “interview form” developed by the researcher. The interview form consisted of 6 items. Content analyze, frequency (f) and percentage (%) techniques were used to analyze the data. This research pointed out that: “concerns on falling behind the teacher”, “training needs”, “decreasing training support within the years” and “non existing policy on IT support” are critical factors affecting an inspector's competency perceptions in using new instructional technologies.