Ultrasonic examination of austenitic welds at reactor pressure vessels

Edelmann, X.

doi:10.1016/0029-5493(91)90143-6

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…The large grains in an austenitic weld tend to follow the heat flow during solidification, growing initially from the weld preparation faces (Edelmann 1991). This reference shows the sorts of grain patterns which are associated with different welding techniques.…”

Section: Ray Tracing Modelmentioning

confidence: 92%

The application of Fermat's principle for imaging anisotropic and inhomogeneous media with application to austenitic steel weld inspection

et al. 2009

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Ultrasonic inspection in anisotropic and inhomogeneous media has long presented a challenge because of the complex steering of ultrasonic paths. An approach is presented in which the true geometry of a previously used austenitic steel weld model is distorted so that, from one viewing location, all ultrasound travels in straight lines with a constant isotropic velocity. The mapping from the real space to this distorted space is accomplished using Fermat's theorem of least travel time applied through ray tracing. Applications specific to inspection design and data interpretation for manual ultrasonic inspection of welds in austenitic steel plates are given. Validation of some intermediate results is provided using finite element analysis.

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Section: Ray Tracing Modelmentioning

confidence: 92%

The application of Fermat's principle for imaging anisotropic and inhomogeneous media with application to austenitic steel weld inspection

et al. 2009

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“…For these reasons, the propagation of ultrasound waves through the austenitic material is intricate due to its inhomogeneous and anisotropic nature. Such a characteristic yields considerable limitations of (1) decreased signal-to-noise ratio (SNR) or increased backscattered energy [4], (2) increased attenuation of the propagating sound waves which limits the range of inspection [5], and (3) increased distortion in the propagation of sound waves [6]. Hence, the inspection of austenitic welds, particularly in thick section welds can be difficult to locate the defect.…”

Section: Introductionmentioning

confidence: 98%

Phased array ultrasonic testing of dissimilar metal welds using geometric based referencing delay law technique

et al. 2015

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Phased array ultrasonic testing (PAUT) techniques are widely used for the non-destructive testing (NDT) of austenitic welds to find defects like cracks. However, the propagation of ultrasound waves through the austenitic material is intricate due to its inhomogeneous and anisotropic nature. Such a characteristic leads beam path distorted which causes the signal to be misinterpreted. By employing a reference block which is cutout from the mockup of which the structure is a dissimilar metal weld (DMW), a new method of PAUT named as Referencing Delay Law Technique (RDLT) is introduced. With the RDLT, full matrix capture (FMC) was used for data acquisition. To reconstruct the images, total focusing method (TFM) was used. After the focal laws were calculated, PAUT was then performed. As a result, the flaws are more precisely positioned with significantly increased signal-to-noise ratio (SNR)

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