Application of Modelling for Enhanced Ultrasonic Inspection of stainless steel welds

Chassignole, Bertrand; Dupond, O.; Fouquet, Thierry; Brun, Alain; Moysan, Joseph; Pierre, Benoist

doi:10.1007/bf03321310

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…Since the ultrasonic waves propagate in different directions with dif ferent velocity in the weld region, this will cause an increase in the scattering and attenuation of the ultrasonic beam [16,17]. Moreover, the characteristic of acoustic impedance mis match existing between the base and weld metal produces large spurious signals during the ultrasonic inspection of austenitic welds [18][19][20]. An angle beam shear wave probe exhibits high amplitude spurious indications from the inter face of the weld, but in the case of longitudinal waves and horizontally polarized shear waves, the amplitude indications are observed to be less sensitive to the angle of propagation [21,22].…”

Section: Introductionmentioning

confidence: 99%

Simulation and experimental analysis of austenitic stainless steel weld joints using ultrasonic phased array

Kumar

Menaka

Venkatraman

2019

Meas. Sci. Technol.

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The phased array ultrasonic technique provides enormous advantages over the conventional ultrasound technique, mostly because of its ability to focus and steer the beam, and its electronic scanning capabilities. Phased array ultrasonic testing of austenitic stainless steel welds is very difficult, due to the presence of coarse or large grains, anisotropic grain structure in the welds and the acoustic impedance mismatch between the base metal and weld metal interface. Due to the influence of these phenomena, it is difficult to analyze the inspection results and to classify the ultrasonic indications. In this paper, two different types of phased array probes (linear array (LA) and dual matrix array (DMA)) are investigated to improve the reliability of ultrasonic testing for austenitic welds. Modelling is used to simulate the propagation of ultrasonic waves in welds using a combination of the approaches of the ray-based model and the semi-analytical model. The optimization of phased array probes (both LA and DMA) for better signal-to-noise ratio and defect detectability has been studied with the help of simulation. The modelling results are validated with experimental results carried out on weld samples. Experiments are carried out on stainless steel weld samples with artificial defects of side drill hole and notches. The experimental ultrasonic images are obtained with linear array probes and dual matrix array probes and were validated with radiographic images. The study reveals that the DMA probe is superior to the LA probe and this is confirmed through the signal-to-noise ratio calculation. The present work clearly indicates that the DMA probe is a promising candidate to evaluate austenitic stainless steel welds.

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Section: Introductionmentioning

confidence: 99%

Simulation and experimental analysis of austenitic stainless steel weld joints using ultrasonic phased array

Kumar

Menaka

Venkatraman

2019

Meas. Sci. Technol.

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“…The non-destructive testing of austenitic welds using ultrasound is vital for the assessment of safety critical structures such as those found in the aerospace and nuclear industries [1]. The polycrystalline microstructure of these welds is highly scattering making it difficult to detect and characterize internal defects [2][3][4][5][6]. To help overcome these difficulties, the use of ultrasound transducer arrays and the associated full matrix capture (FMC) data is becoming more widespread.…”

Section: Introductionmentioning

confidence: 99%

The detection of flaws in austenitic welds using the decomposition of the time-reversal operator

et al. 2016

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The non-destructive testing of austenitic welds using ultrasound plays an important role in the assessment of the structural integrity of safety critical structures. The internal microstructure of these welds is highly scattering and can lead to the obscuration of defects when investigated by traditional imaging algorithms. This paper proposes an alternative objective method for the detection of flaws embedded in austenitic welds based on the singular value decomposition of the time-frequency domain response matrices. The distribution of the singular values is examined in the cases where a flaw exists and where there is no flaw present. A lower threshold on the singular values, specific to austenitic welds, is derived which, when exceeded, indicates the presence of a flaw. The detection criterion is successfully implemented on both synthetic and experimental data. The datasets arising from welds containing a flaw are further interrogated using the decomposition of the time-reversal operator (DORT) method and the total focusing method (TFM), and it is shown that images constructed via the DORT algorithm typically exhibit a higher signal-to-noise ratio than those constructed by the TFM algorithm.

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A flexible numerical approach for non-destructive ultrasonic testing based on a time-domain spectral-element method: Ultrasonic modeling of Lamb waves in immersed defective structures and of bulk waves in damaged anisotropic materials

Rosenkrantz

Bottero

Komatitsch

et al. 2019

NDT & E International

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Application of Modelling for Enhanced Ultrasonic Inspection of stainless steel welds

Cited by 7 publications

References 10 publications

Simulation and experimental analysis of austenitic stainless steel weld joints using ultrasonic phased array

Simulation and experimental analysis of austenitic stainless steel weld joints using ultrasonic phased array

The detection of flaws in austenitic welds using the decomposition of the time-reversal operator

A flexible numerical approach for non-destructive ultrasonic testing based on a time-domain spectral-element method: Ultrasonic modeling of Lamb waves in immersed defective structures and of bulk waves in damaged anisotropic materials

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