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NDT.net Issue - 2016-05 - Articles
NDT.net Issue: 2016-05
Publication: e-Journal of Nondestructive Testing (NDT) ISSN 1435-4934 (NDT.net Journal)
ARTICLE

Acoustic Velocity Determination for AUT on Spiral Pipe Girth Welds

Edward Ginzel198, Henk Van Dijk23
1Materials Research Institute101, Waterloo, Canada
2JES Pipelines, Willemstad, Canada

Abstract: Determining acoustic velocity is a critical aspect for the correct calculation of Snell’s Law to determine refracted angle and to position the location of flaws along the soundpath of an ultrasonic beam. This has been seen as a critical part of preparations in girth weld inspections using zonal discrimination where it is mandated by codes. The typical steels used in pipeline construction are slightly anisotropic, making it necessary to determine the shear velocities at different angles in the plane of inspection. Anisotropy occurs due to the alignment of the acicular crystals in the direction of rolling. When the pipe is made with a longitudinal seam the velocities change in a relatively simple fashion because the changes occur in predominantly one plane of the crystal axes. However, when the pipe is made by the spiral welding process, the girth weld inspection requires the beam to cross the plane of the crystal axes at an angle. Refraction calculations for the longitudinal seam pipe have been demonstrated to use the fast SH shear mode. However, for pipe made using the spiral welding process, it has been found that the fast SH shear mode need not provide the best velocity for calculating the refracted angle in a zonal discrimination technique.

Keywords: Ultrasonic Testing (UT) (4095),
*Keywords are freely formed keywords from the authors and thus you may Search also for similar terms.

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