Analysis on Ultrasonic TOFD Imaging Testing for Ultra-thick-walled EBW Joint of Aluminum Alloy

Cong, Shengyi; Zhang, W.W.; Zhang, J.Y.; Tang, Gang

doi:10.1016/j.proeng.2017.10.960

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…Moreover, our ultrasonic receiver response has higher efficiency at detection of longitudinal waves. The velocity of longitudinal wave propagation in homogenous aluminum is 6300 m/s [5].…”

Section: Methodsmentioning

confidence: 99%

“…The emitter-receiver ultrasonic inspection scheme, based on ultrasonic transducers, has been classically adopted for damage detection and failure localization as a cost-effective NDE strategy [5,6]. However, the low output excitation power of the ultrasonic transducers prevents such approaches from being used remotely.…”

Section: Introductionmentioning

confidence: 99%

“…The detection and quantization of embedded damages in metallic components is still a challenging field of research in terms of applying suitable signal processing techniques and defect reconstruction methodologies to extract characteristic ultrasonic wave contents and generate reliable defect estimations. In this regard, time-domain analysis represents a set of powerful tools which are applied often for damage detection purposes [5]. If the amplitude of the ultrasonic signal events exceeds a certain threshold, they are recorded and characterized.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Laser Ultrasound Inspection Based on Wavelet Transform and Data Clustering for Defect Estimation in Metallic Samples

Selim

Delgado-Prieto

Trull

et al. 2019

Sensors

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Laser-generated ultrasound is a modern non-destructive testing technique. It has been investigated over recent years as an alternative to classical ultrasonic methods, mainly in industrial maintenance and quality control procedures. In this study, the detection and reconstruction of internal defects in a metallic sample is performed by means of a time-frequency analysis of ultrasonic waves generated by a laser-induced thermal mechanism. In the proposed methodology, we used wavelet transform due to its multi-resolution time frequency characteristics. In order to isolate and estimate the corresponding time of flight of eventual ultrasonic echoes related to internal defects, a density-based spatial clustering was applied to the resulting time frequency maps. Using the laser scan beam’s position, the ultrasonic transducer’s location and the echoes’ arrival times were determined, the estimation of the defect’s position was carried out afterwards. Finally, clustering algorithms were applied to the resulting geometric solutions from the set of the laser scan points which was proposed to obtain a two-dimensional projection of the defect outline over the scan plane. The study demonstrates that the proposed method of wavelet transform ultrasonic imaging can be effectively applied to detect and size internal defects without any reference information, which represents a valuable outcome for various applications in the industry.

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“…Moreover, our ultrasonic receiver response has higher efficiency at detection of longitudinal waves. The velocity of longitudinal wave propagation in homogenous aluminum is 6300 m/s [5].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Laser Ultrasound Inspection Based on Wavelet Transform and Data Clustering for Defect Estimation in Metallic Samples

Selim

Delgado-Prieto

Trull

et al. 2019

Sensors

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show abstract

“…For each excitation point, the transducer records a voltage/time (A-scan) data set. We used longitudinal wave detection transducers considering longitudinal ultrasound wave propagation inside the aluminum material at a velocity of 6320 m/s [38,39].…”

Section: Experimental Configurationmentioning

confidence: 99%

Fully Noncontact Hybrid NDT for 3D Defect Reconstruction Using SAFT Algorithm and 2D Apodization Window

Selim

Trull

Delgado-Prieto

et al. 2019

Sensors

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Nondestructive testing of metallic objects that may contain embedded defects of different sizes is an important application in many industrial branches for quality control. Most of these techniques allow defect detection and its approximate localization, but few methods give enough information for its 3D reconstruction. Here we present a hybrid laser–transducer system that combines remote, laser-generated ultrasound excitation and noncontact ultrasonic transducer detection. This fully noncontact method allows access to scan areas on different object’s faces and defect details from different angles/perspectives. This hybrid system can analyze the object’s volume data and allows a 3D reconstruction image of the embedded defects. As a novelty for signal processing improvement, we use a 2D apodization window filtering technique, applied along with the synthetic aperture focusing algorithm, to remove the undesired effects due to side lobes and wide-angle reflections of propagating ultrasound waves, thus enhancing the resulting 3D image of the defect. Finally, we provide both qualitative and quantitative volumetric results that yield valuable information about defect location and size.

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“…The schematic representation of our experimental setup and of the object under study is shown in Figure 3 We use longitudinal wave detection transducers considering longitudinal ultrasound wave propagation inside the aluminum material at a velocity of 6320 m/s [26,27].…”

Section: Experimental Configurationmentioning

confidence: 99%

Fully Non-Contact Hybrid NDT Inspection for 3D Defect Reconstruction Using an Improved SAFT Algorithm

Selim¹,

Trull²,

Delgado-Prieto³

et al. 2019

Preprint

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Non-destructive testing of metallic objects that may contain embedded defects of different sizes is an important application in many industrial branches for quality control. Most of these techniques allow defect detection and its approximate localization, but very few give enough information for its 3D reconstruction. Here we present a hybrid laser – transducer system that combines remote laser-generated ultrasound excitation and non-contact ultrasonic transducer detection. This fully non-contact method gives access to separating scan areas on different object’s faces and defect details from different angles/perspectives can be analysed. This hybrid system can analyse the whole object’s volume data and allow a 3D reconstruction image of the embedded defects. As a novelty for the signal processing improvement, we use a 2D apodization window filtering technique, applied along with the synthetic aperture focusing algorithm in order to remove the undesired effects of side lobes and wide-angle reflections of propagating ultrasound waves, thus, enhancing the resulting 3D image of the defect. We provide both qualitative and quantitative volumetric results with high accuracy and resolution compared with conventional techniques.

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Analysis on Ultrasonic TOFD Imaging Testing for Ultra-thick-walled EBW Joint of Aluminum Alloy

Cited by 9 publications

References 12 publications

Laser Ultrasound Inspection Based on Wavelet Transform and Data Clustering for Defect Estimation in Metallic Samples

Laser Ultrasound Inspection Based on Wavelet Transform and Data Clustering for Defect Estimation in Metallic Samples

Fully Noncontact Hybrid NDT for 3D Defect Reconstruction Using SAFT Algorithm and 2D Apodization Window

Fully Non-Contact Hybrid NDT Inspection for 3D Defect Reconstruction Using an Improved SAFT Algorithm

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