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An artefact suppression framework in ultrasonic phased array tomography for metal welds 金属焊缝超声相控阵层析成像中的伪影抑制框架
IF 4.1 2区 材料科学
Ndt & E International Pub Date : 2025-04-27 DOI: 10.1016/j.ndteint.2025.103423
Shaofeng Wang , Erqing Zhang , Bo Yuan , Luncai Zhou , Yongquan Han , Wenjing Liu , Jun Hong , Guang Xu
{"title":"An artefact suppression framework in ultrasonic phased array tomography for metal welds","authors":"Shaofeng Wang ,&nbsp;Erqing Zhang ,&nbsp;Bo Yuan ,&nbsp;Luncai Zhou ,&nbsp;Yongquan Han ,&nbsp;Wenjing Liu ,&nbsp;Jun Hong ,&nbsp;Guang Xu","doi":"10.1016/j.ndteint.2025.103423","DOIUrl":"10.1016/j.ndteint.2025.103423","url":null,"abstract":"<div><div>Artefacts that resemble defects can lead to inaccurate quality assessments in metal welds. Reducing residual artefacts while preserving the integrity of defect signals presents a significant challenge. To address this, a framework for artefact suppression based on a 3D denoising autoencoder is proposed, comprising two key developments: (1) The artefact rather than defects is reconstructed for the gradient vanishing issue in 3D denoising autoencoders when processing high-dimensional data, which results in excessive residual artefacts. Subsequently, a network framework based on multilayer bidirectional long short-term memory is proposed for tomographic image processing, enhancing reconstruction accuracy. (2) A cross-modal temporal-spatial attention module is developed to assist 3D autoencoders in identifying latent patterns of artefact. Particularly, their periodic differences are captured, regarded as the intrinsic distinction between defects and artefacts in tomographic detection. Experimental results demonstrate that the proposed framework effectively suppresses the side-lobe artefact and those caused by multiple reflections and mode conversions. While this approach is primarily designed for metal welds, it also shows promise for artefact suppression in metal castings and potential applications in medical imaging.</div></div>","PeriodicalId":18868,"journal":{"name":"Ndt & E International","volume":"155 ","pages":"Article 103423"},"PeriodicalIF":4.1,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143898647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Closed crack sizing using a standard pulse echo method and a transient thermal solicitation 采用标准脉冲回波法和瞬态热激发法确定闭合裂纹尺寸
IF 4.1 2区 材料科学
Ndt & E International Pub Date : 2025-04-21 DOI: 10.1016/j.ndteint.2025.103420
A. Perrin , C. Gueudré , M.A. Ploix , G. Corneloup , P. Recolin , C. Payan
{"title":"Closed crack sizing using a standard pulse echo method and a transient thermal solicitation","authors":"A. Perrin ,&nbsp;C. Gueudré ,&nbsp;M.A. Ploix ,&nbsp;G. Corneloup ,&nbsp;P. Recolin ,&nbsp;C. Payan","doi":"10.1016/j.ndteint.2025.103420","DOIUrl":"10.1016/j.ndteint.2025.103420","url":null,"abstract":"<div><div>Closed crack sizing using conventional linear ultrasonic methods is hindered by the transmission of waves through local contacts between crack lips. Nonlinear acoustic methods, while offering potential solutions, often require complex experimental protocols and restrictive conditions. This study presents a novel approach that enhances conventional NDT by applying transient local cooling to closed cracks. The resulting thermal diffusion temporarily opens the closed portions of the crack, enabling accurate depth measurement using a standard pulse echo technique during this transient state. The method's effectiveness is demonstrated on fatigue cracks in both laboratory samples and industrial low-alloy steel parts. The results demonstrate significant improvements in crack detection and sizing, making it a promising, cost-effective solution for various industries, including nuclear energy and naval.</div></div>","PeriodicalId":18868,"journal":{"name":"Ndt & E International","volume":"155 ","pages":"Article 103420"},"PeriodicalIF":4.1,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Combining laser-excited edge resonance and ZGV resonance for measuring wave velocities and global thickness distribution of isotropic homogeneous plates 结合激光激发边缘共振和ZGV共振测量各向同性均匀板的波速和整体厚度分布
IF 4.1 2区 材料科学
Ndt & E International Pub Date : 2025-04-21 DOI: 10.1016/j.ndteint.2025.103421
Haotian Jia , Xiangen Liu , Zhonghua Shen , Zheng Li , Tu Xu
{"title":"Combining laser-excited edge resonance and ZGV resonance for measuring wave velocities and global thickness distribution of isotropic homogeneous plates","authors":"Haotian Jia ,&nbsp;Xiangen Liu ,&nbsp;Zhonghua Shen ,&nbsp;Zheng Li ,&nbsp;Tu Xu","doi":"10.1016/j.ndteint.2025.103421","DOIUrl":"10.1016/j.ndteint.2025.103421","url":null,"abstract":"<div><div>The limitations of the common ZGV resonance method, which combines the lowest-order Zero Group Velocity mode (S<sub>1</sub>-ZGV) with an arbitrarily high-order resonance, for assessing the wave velocities of plates, were analyzed. A novel ZGV resonance method, combining laser-excited edge resonance and S<sub>1</sub>-ZGV, is proposed to solve the problems of low signal-to-noise ratio and the difficulty in identifying of higher-order resonances. Furthermore, this method overcomes the problem of the ZGV disappearing at the plate edge and can be used to measure the plate edge thickness. The relationship between the frequency ratio of the S<sub>1</sub>-ZGV resonance to the edge resonance and the Poisson's ratio of the material was derived. Experimentally, the ZGV and edge resonances within the plate were observed using laser ultrasonic technology. Finally, the global thickness of the plate and the wave velocities of the material were accurately determined.</div></div>","PeriodicalId":18868,"journal":{"name":"Ndt & E International","volume":"155 ","pages":"Article 103421"},"PeriodicalIF":4.1,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Characterization of semi-infinite inhomogeneous delaminations using lock-in thermography 用锁定热成像表征半无限非均匀分层
IF 4.1 2区 材料科学
Ndt & E International Pub Date : 2025-04-19 DOI: 10.1016/j.ndteint.2025.103417
Jon Pérez-Arbulu , José Carlos Ciria , Arantza Mendioroz , Ricardo Celorrio , Agustín Salazar
{"title":"Characterization of semi-infinite inhomogeneous delaminations using lock-in thermography","authors":"Jon Pérez-Arbulu ,&nbsp;José Carlos Ciria ,&nbsp;Arantza Mendioroz ,&nbsp;Ricardo Celorrio ,&nbsp;Agustín Salazar","doi":"10.1016/j.ndteint.2025.103417","DOIUrl":"10.1016/j.ndteint.2025.103417","url":null,"abstract":"<div><div>Delaminations are buried defects parallel to the surface. Beyond detection, the challenge is to size the geometrical parameters of the delamination. For detection and characterization purposes, we propose using optically excited lock-in infrared thermography. In previous papers we dealt with infinite and semi-infinite delaminations featuring homogeneous thickness, i.e. constant thermal resistance. In this work, with the aim of approaching real life flaws, we propose to characterize semi-infinite heterogeneous delaminations, i.e. of varying thickness. We calculate the surface temperature oscillation analytically. Then, we perform experiments on calibrated delaminations of triangular cross-section. By fitting the analytical model to the experiments, we obtain the morphological parameters of the delamination. The quality of the fittings allows us to unambiguously distinguish between homogeneous and heterogeneous delaminations.</div></div>","PeriodicalId":18868,"journal":{"name":"Ndt & E International","volume":"155 ","pages":"Article 103417"},"PeriodicalIF":4.1,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143851910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exploring technological innovations in employing structural health monitoring for glass 探索玻璃结构健康监测的技术创新
IF 4.1 2区 材料科学
Ndt & E International Pub Date : 2025-04-17 DOI: 10.1016/j.ndteint.2025.103418
Elshan Ahani , Jian Yang , Sima Bahram Ghannad
{"title":"Exploring technological innovations in employing structural health monitoring for glass","authors":"Elshan Ahani ,&nbsp;Jian Yang ,&nbsp;Sima Bahram Ghannad","doi":"10.1016/j.ndteint.2025.103418","DOIUrl":"10.1016/j.ndteint.2025.103418","url":null,"abstract":"<div><div>The implementation of structural health monitoring (SHM) for glass structures is still at an early stage of development. Limited information can be found in existing literature regarding the use of SHM on glass elements. However, recent technological advancements have significantly improved our understanding in this area. Both SHM and the utilization of laminated glasses (LGs) for structural purposes are relatively new concepts with a short history. To conduct a comprehensive assessment of glass elements, it is crucial to have a solid understanding of both glass and SHM sciences. This research aims to explore various approaches for implementing SHM on structural glass elements, with a specific focus on the utilization of artificial intelligence (AI) and machine learning (ML) techniques. By harnessing the power of ML, the SHM system can analyze large amounts of data collected from sensors placed on glass structures. Furthermore, the application of AI in SHM can facilitate real-time monitoring, predictive maintenance, and risk assessment for glass structures. The findings emphasize the critical role of early detection in preventing damage to glass elements and demonstrate the effectiveness of SHM in achieving this objective. The use of AI features, such as ML, presents promising opportunities for advancing the capabilities of SHM in the structural glass domain. The incorporation of AI features, such as ML algorithms, could offer additional advantages in this field.</div></div>","PeriodicalId":18868,"journal":{"name":"Ndt & E International","volume":"155 ","pages":"Article 103418"},"PeriodicalIF":4.1,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143924362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High-resolution pipeline in-line inspection based on non-equilibrium sensing with uneven electromagnetic distribution 基于电磁分布不均匀的非平衡传感的高分辨率管道在线检测
IF 4.1 2区 材料科学
Ndt & E International Pub Date : 2025-04-15 DOI: 10.1016/j.ndteint.2025.103415
Jiaqi Zhou , Qiuping Ma , Bin Gao , Xumei Yang , Donghai Tang , Xiaoxiong Mo , Shiqiang Jiang
{"title":"High-resolution pipeline in-line inspection based on non-equilibrium sensing with uneven electromagnetic distribution","authors":"Jiaqi Zhou ,&nbsp;Qiuping Ma ,&nbsp;Bin Gao ,&nbsp;Xumei Yang ,&nbsp;Donghai Tang ,&nbsp;Xiaoxiong Mo ,&nbsp;Shiqiang Jiang","doi":"10.1016/j.ndteint.2025.103415","DOIUrl":"10.1016/j.ndteint.2025.103415","url":null,"abstract":"<div><div>High-resolution eddy current in-pipe inspection faces a critical trade-off between sensitivity and resolution. In particular, the uneven magnetic field will result in inconsistent responses from the receiving array elements to decrease the sensitivity of defect, complicating the defect identification and evaluation. To address this issue, this study develops a non-equilibrium sensing mode of enhancing electromagnetic field adjustments to balance the induction field due to an uneven distribution. Specifically, it builds upon differential eddy current probes by adaptively constructing Gaussian compensate distributed hollow-core copper coils with varied structural parameters, forming a receiving array that enhances the probe's discriminative ability as well as maintaining sensitivity. To strengthen the induced eddy current, the excitation coil is relocated from above the receiving coil to the same plane as the receiving coil array. This adjustment mitigates the sensitivity reduction caused by the resolution enhancement. A theoretical equivalent circuit model of the proposed method is established. Both simulation and experiments on vary defects in pipeline have been conducted to validate the reliability and efficiency of the proposed system. Furthermore, the defect's location relative to the probe and its estimated size can be preliminarily determined based on the presence and amplitude of the detection signal from the receiving coil array.</div></div>","PeriodicalId":18868,"journal":{"name":"Ndt & E International","volume":"155 ","pages":"Article 103415"},"PeriodicalIF":4.1,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bearing steels with grinding burns studied by Barkhausen noise and advanced microscopy techniques – Role of carbides stability in steel performance 用巴克豪森噪声和先进显微技术研究有磨削烧伤的轴承钢。碳化物稳定性在钢性能中的作用
IF 4.1 2区 材料科学
Ndt & E International Pub Date : 2025-04-14 DOI: 10.1016/j.ndteint.2025.103416
S. Santa-aho , M. Neslušan , M. Honkanen , L. Azzari , O. Životský , J. Čapek , M. Vippola
{"title":"Bearing steels with grinding burns studied by Barkhausen noise and advanced microscopy techniques – Role of carbides stability in steel performance","authors":"S. Santa-aho ,&nbsp;M. Neslušan ,&nbsp;M. Honkanen ,&nbsp;L. Azzari ,&nbsp;O. Životský ,&nbsp;J. Čapek ,&nbsp;M. Vippola","doi":"10.1016/j.ndteint.2025.103416","DOIUrl":"10.1016/j.ndteint.2025.103416","url":null,"abstract":"<div><div>Magnetic Barkhausen noise (MBN) signal is very sensitive to microstructure and stresses of the sample. However, many details of the link between microstructure and MBN signal still remain to be understood. Here, advanced microscopy techniques together with X-ray diffraction method were used for characterization of the industrially-relevant steel structures and the results were linked to the MBN signal outcomes. This study deals with thermal burn during grinding cycles of two different roll-bearing steels, case-carburised (CC) steel and 100Cr6 bearing steel, with different carbide structures. Thermal stability of steels is analysed with many different characterization and visualisation methods to link the structural features affecting the observed magnetic Barkhausen noise signal changes. Due to the different manufacturing operations and compositions of the studied steels, the carbide structure and produced magnetic domain structure, were observed to vary in addition to their different MBN behaviour against thermal burn. Larger and more stable carbides in 100Cr6 bearing steel were noticed to tolerate better the thermal load whereas case-carburised steel underwent more changes in the microstructure and also in the MBN. The work explores the role of structure on carbide stability and discusses the correlation between Barkhausen noise signals and key factors, such as dislocation density, retained austenite fraction, residual stress state, domain wall thickness, and particularly carbide size.</div></div>","PeriodicalId":18868,"journal":{"name":"Ndt & E International","volume":"155 ","pages":"Article 103416"},"PeriodicalIF":4.1,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparative analysis of electromagnet and coil-based magneto-acoustic emission detection in pre-stressed Q235 steel Q235预应力钢电磁与线圈磁声发射检测的对比分析
IF 4.1 2区 材料科学
Ndt & E International Pub Date : 2025-04-11 DOI: 10.1016/j.ndteint.2025.103414
Wasil Riaz , Zenghua Liu , Xiaoran Wang , Yongna Shen , Omer Farooq , Cunfu He , Gongtian Shen
{"title":"Comparative analysis of electromagnet and coil-based magneto-acoustic emission detection in pre-stressed Q235 steel","authors":"Wasil Riaz ,&nbsp;Zenghua Liu ,&nbsp;Xiaoran Wang ,&nbsp;Yongna Shen ,&nbsp;Omer Farooq ,&nbsp;Cunfu He ,&nbsp;Gongtian Shen","doi":"10.1016/j.ndteint.2025.103414","DOIUrl":"10.1016/j.ndteint.2025.103414","url":null,"abstract":"<div><div>This study presents a comparative analysis of magneto-acoustic emission (MAE) signal detection using contact-based electromagnet and non-contact coil setups in pre-stressed Q235 steel samples. The research investigates how these two excitation methods influence MAE signal characteristics, including amplitude, root mean square (RMS), pulse counts, and pulse height distribution (PHD), under varying excitation frequencies (1, 10, and 20 Hz), voltages (10, 20, and 30 V) and tensile strain levels. The results demonstrate that the coil setup provides stable and consistent MAE signals, serving as a reliable baseline, while the electromagnet setup exhibits greater signal sensitivity but introduces variability due to contact-based excitation. The study highlights how contact quality and air-gap effects influence MAE signal variability in electromagnet-based detection of pre-stressed Q235 steel, the need for optimizing excitation conditions and understanding the limitations of electromagnet-based MAE for more reliable non-destructive testing in industrial applications, enabling the broader adoption of MAE-based non-destructive testing in industrial settings.</div></div>","PeriodicalId":18868,"journal":{"name":"Ndt & E International","volume":"155 ","pages":"Article 103414"},"PeriodicalIF":4.1,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A conjugate gradient weighted least squares reconstruction method with region of interest correction for cone-beam rotational computed laminography 带兴趣区校正的锥束旋转层析计算的共轭梯度加权最小二乘重建方法
IF 4.1 2区 材料科学
Ndt & E International Pub Date : 2025-04-10 DOI: 10.1016/j.ndteint.2025.103396
Chengxiang Wang , Yu He , Jiaxi Wang , Wei Yu
{"title":"A conjugate gradient weighted least squares reconstruction method with region of interest correction for cone-beam rotational computed laminography","authors":"Chengxiang Wang ,&nbsp;Yu He ,&nbsp;Jiaxi Wang ,&nbsp;Wei Yu","doi":"10.1016/j.ndteint.2025.103396","DOIUrl":"10.1016/j.ndteint.2025.103396","url":null,"abstract":"<div><div>Cone-beam rotational computed laminography (CL) is a highly effective inspection technique for non-destructive testing of objects with a large aspect ratio, such as printed circuit boards (PCB) and insulated gate bipolar transistors (IGBT). However, when scanning objects with a large aspect ratio, the projection data may become truncated, resulting in region of interest (ROI) artifacts in the reconstructed image and reducing the contrast of the reconstructed image. To address this issue, we have proposed a weighted factor that considers the length of the ray within the reconstructed volume and the distance between the X-ray source and the detector bin position. We have also developed a method called ROI conjugate gradient weighted least squares (ROI-CGWLS) to suppress ROI artifacts and enhance the contrast of the reconstructed image in Cone-beam rotational CL. Both simulation and real PCB experimental results demonstrate the effectiveness of the proposed ROI-CGWLS method in suppressing ROI artifacts and improving image contrast and resolution compared to other classical reconstruction methods.</div></div>","PeriodicalId":18868,"journal":{"name":"Ndt & E International","volume":"155 ","pages":"Article 103396"},"PeriodicalIF":4.1,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Acoustic emission signal characteristics of crack and porosity defects formation during laser cladding WC/Fe313 coatings 激光熔覆WC/Fe313涂层裂纹和气孔缺陷形成的声发射信号特征
IF 4.1 2区 材料科学
Ndt & E International Pub Date : 2025-04-10 DOI: 10.1016/j.ndteint.2025.103404
Qiang Lin , Bin Yang , Lin Liu , Xinyu Yao , Haohao Ding , Shuyue Zhang , Min Yang , Qian Xiao , Wenjian Wang
{"title":"Acoustic emission signal characteristics of crack and porosity defects formation during laser cladding WC/Fe313 coatings","authors":"Qiang Lin ,&nbsp;Bin Yang ,&nbsp;Lin Liu ,&nbsp;Xinyu Yao ,&nbsp;Haohao Ding ,&nbsp;Shuyue Zhang ,&nbsp;Min Yang ,&nbsp;Qian Xiao ,&nbsp;Wenjian Wang","doi":"10.1016/j.ndteint.2025.103404","DOIUrl":"10.1016/j.ndteint.2025.103404","url":null,"abstract":"<div><div>The addition of WC particles during metal laser cladding (LC) additive manufacturing process not only increases the high-temperature wear resistance but also improves the cracking sensitivity of the cladding. In this paper, LC processes of Fe313 power mixed with different contents of WC were monitored by an acoustic emission (AE) equipment. Combined with the results of temperature and morphology of molten pool and 3D micro-CT imaging results of defects in the cladding, the AE signal response characteristics (Amplitude distributions, <span><math><mrow><mi>A</mi><msub><mi>E</mi><mrow><mi>R</mi><mi>M</mi><mi>S</mi></mrow></msub></mrow></math></span> and <span><math><mrow><mi>A</mi><msub><mi>E</mi><mrow><mi>A</mi><mi>S</mi><mi>L</mi></mrow></msub></mrow></math></span> of AE hit signals and time-frequency decomposition results of AE waveform signals) of crack and pore defects during LC process were obtained. The crack formation time detected by the AE signal was consistent with the monitoring results of the high-speed camera. Furthermore, the number and type of defects monitored by the AE signal were consistent with the results of CT imaging and microscopic analysis. The results indicated that the AE monitoring was a reliable online detection method for LC process. Based on the CT imaging results, the unmelted WC particle in the CT image was separated, and the mass fraction of WC powder was calculated and identified, and the detection error of the mass fraction was only 0.505 %. This study can provide theoretical guidance for defect identification and feedback control in laser additive manufacturing process.</div></div>","PeriodicalId":18868,"journal":{"name":"Ndt & E International","volume":"155 ","pages":"Article 103404"},"PeriodicalIF":4.1,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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