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NDT.net Issue - 2016-01 - Articles
NDT.net Issue: 2016-01
Publication: Malaysia International NDT Conference and Exhibition 2015, Nov 22–24, Kuala Lumpur, Malaysia (NDT Malaysia 2015)

Single sided weld inspection using advanced ultrasonic methods

Dheeraj Ravichandran, Shaik Khaja Mohuiddin, Mohsin Ismail
Technical Development; A Star Training & Consultancy Pte Ltd4, Singapore, Singapore

Abstract: Advanced ultrasonic examination methods such as Phased Array Ultrasonic Testing (PAUT) & Time of Flight Diffraction (ToFD) have been an effective volumetric examination for welds. This is true for access of scanning from both sides, however for single side access welds, such as welds at elbow, flange and cross-section pipes, the limited scanning compromises the detection of lack of fusion on the bevel opposite to the probe side. Single sided access weld examination in conventional approach using phased array is dependent on back diffraction signals with increased dB levels. However, it is difficult to achieve higher confidence level of detectability for such flaws. This paper provides a case study on single sided examination using inspection simulation software and confirms the same using practical testing on specimens. This case study also compares the detection proficiency between conventional phased array s-scan and Dual Matrix Phased Array.

Keywords: NDT-wide (1166), Ultrasonic Testing (UT) (4107), Simulation (163), CIVA (27), probability of detection (48), focal law (2), ultrasonic (106), conventional PAUT, dual matrix array UT, single-sided access welds, Advanced Phased Array,
*Keywords are freely formed keywords from the authors and thus you may Search also for similar terms.



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