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NDT.net Issue - 2017-12 - Articles
NDT.net Issue: 2017-12
Publication: NDT in Canada 2017, June 6-8, Quebec (NDT Canada 2017)
Session: Phased Array UT (PAUT) Development
ARTICLE

Adapting CSA W59 ultrasonic inspections for use with distance-amplitude techniques

Paul Holloway12, Andrew Crawford2, Sean Keay3, Viwek Vaidya44
1Holloway NDT & Engineering Inc.2, Georgetown, Ontario, Canada
2Buffalo Inspection Services, Edmonton, Canada
3SNC-Lavalin, Montreal, Canada
4Techno Vogue Inc3, Beaconsfield, Canada

Abstract: Ultrasonic testing (UT) of welds to CSA W59 is based on techniques dating back the late 1960s with the original inception of UT into AWS D1.0. Since the original development, there has been significant progress in UT technologies, yet North American codes have failed to keep pace. The foundation of the W59/D1.1 approach is to manually or programmatically calculate attenuation using a linear approximation of 2 dB per inch. This approach places restrictions on equipment, incurs calibrations indicative of the analog era, and uses prescriptive procedure tables and angle-specific acceptance criteria. The protocols associated with these procedures have outlived their usefulness, and unnecessarily inhibit progress in adapting to more suitable transducers and newer technologies such as phased array. An overview of the proposed changes to W59 currently under review are presented. The differences between the 2 dB factor and actual attenuation are determined through simulation and experiment, providing the basis of the corrections applied to the existing acceptance tables, adapted for use with distance amplitude techniques. The new technique is shown to improve repeatability and allows for a broader range of transducers while still maintaining equivalent quality levels.

Keywords: Ultrasonic Testing (UT) (4102), TCG (2), CSA W59, 2dB,
*Keywords are freely formed keywords from the authors and thus you may Search also for similar terms.

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