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ultrasonic inspection for circumferential butt joint of austenitic stainless steel with carbon steel

China Welding 2006年第2期15卷 64-67页

作者：万升云熊腊森 School of Material Science and Engineering Huazhong University of Science and Technology

Tthe practical application of ultrasonic wave inspection in welded joint by austenitic stainless steel with carbon steel is presented. It is shown from the experimental results that the high frequency narrow-pulsed longitudinal ultrasonic wave inspection technique can detect the defects in deferent sound path and location within the tested welded joint clearly and exactly. The study in the paper may provide a new approach for further application of ultrasonic inspection in coarse-grained materials.

关键词： coarse-grained materials welded joint ultrasonic inspection

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Image processing techniques for ultrasonic inspection

Image processing techniques for ultrasonic inspection

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17th World Conference on Non-Destructive Testing

作者： Hartmut KIECKHOEFER Jan BAAN Arian MAST Arno W.F.VOLKER TNO Industry ＆ Technology PO Box 1552600 AD DelftThe Netherlands

＜正＞Manual inspection of ultrasonic evaluation images can not only be a time- consuming and therefore expensive task,it can also suffer from operator *** this work we apply image processing techniques to automatically inspect ultrasonic C-scan *** method is based on the comparison of a C- scan image with a reconstructed reference *** method was tested on a set of C-scan images with known defects and was able to detect all *** number of false detections is still high and will be addressed in future research.

关键词： Image processing ultrasonic inspection C-scan images Automated interpretation ROC parameters

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ultrasonic In-line inspection of Pipeline Corrosion Based on Support Vector Machine Multi-classifier

Ultrasonic In-line Inspection of Pipeline Corrosion Based on...

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第二十九届中国控制会议

作者： XU Yun 1,2,DAI Bo 2,TIAN Xiaoping 2,SHENG Sha 2 1.Beijing University of Chemical Technology,Beijing 100029,P.R.China2.Beijing Institute of Petro-chemical Technology,Beijing 102617,P.R.China

Because of the complicated condition in pipeline,ultrasonic detection echoes are affected by many factors such as the line defect orientation,the defect width,the branching-point geometry,wall roughness,working state and the interaction between the different *** it is difficult to distinguish ultrasonic detection *** ultrasonic detection echoes from experiments,use radial basis kernel function to process the signal,and achieve automatic recognition byusing one-against-rest algorithm and tree *** experimental results show that the method not only improves the recognition correct rate,but also improves the computing speed,and achieves good results.

关键词： ultrasonic inspection Support Vector Machine Multi-classifier

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A review of nondestructive examination technology for polyethylene pipe in nuclear power plant

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Frontiers of Mechanical Engineering 2018年第4期13卷 535-545页

作者： Jinyang ZHENG Yue ZHANG Dongsheng HOU Yinkang QIN Weican GUO Chuck ZHANG Jianfeng SHI Institute of Process Equipment Zhejiang University Hangzhou 310027 China Zhejiang Provincial Special Equipment inspection and Research Institute Hangzhou 310027 China Georgia Tech Manufacturing Institute Georgia Institute of TechnologyAtlanta GA 30332 USA

Polyethylene （PE） pipe, particularly high- density polyethylene （HDPE） pipe, has been successfully utilized to transport cooling water for both non-safety- and safety-related applications in nuclear power plant （NPP）. Though ASME Code Case N755, which is the first code case related to NPP HDPE pipe, requires a thorough nondestructive examination （NDE） of HDPE joints. However, no executable regulations presently exist because of the lack of a feasible NDE technique for HDPE pipe in NPP. This work presents a review of current developments in NDE technology for both HDPE pipe in NPP with a diameter of less than 400 mm and that of a larger size. For the former category, phased array ultrasonic technique is proven effective for inspecting typical defects in HDPE pipe, and is thus used in Chinese national standards GB/T 29460 and GB/T 29461. A defect- recognition technique is developed based on pattern recognition, and a safety assessment principle is summa- rized from the database of destructive testing. On the other hand, recent research and practical studies reveal that in current ultrasonic-inspection technology, the absence of effective ultrasonic inspection for large size was lack of consideration of the viscoelasticity effect of PE on acoustic wave propagation in current ultrasonic inspection technology. Furthermore, main technical problems were analyzed in the paper to achieve an effective ultrasonic test method in accordance to the safety and efficiency requirements of related regulations and standards. Finally, the development trend and challenges of NDE test technology for HDPE in NPP are discussed.

关键词： polyethylene pipe nuclear power plant ultrasonic inspection nondestructive testing safety assessment

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Minimization of Internal Reverberation in Acoustic Windows Used in US inspection Systems by Numerical Simulation

Minimization of Internal Reverberation in Acoustic Windows U...

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17th World Conference on Non-Destructive Testing

作者： M.S.VAN DER HEIDEN J.G.P.BLOOM C.BOSSCHAART J.L.DELTOMBE A.W.F.VOLKER TNO science and industry the Netherlandsmaurits Advanced Logic Technology (ALT) Luxembourg TNO science and industry the Netherlandsmaurits.

＜正＞Most ultrasonic tools for the inspection of pipelines or bore-holes consist of a transducer,separated from the exterior by an acoustic *** acoustic window protects the device from the potentially hostile exterior and is part of the mechanical *** the acoustic window is positioned between the transducer and the region of *** to mechanical constraints and acoustic impedance differences between the window and the in-exterior mediums,the acoustic window will produce unwanted internal *** amplitude of these reflections is normally much higher than the background noise *** reflections hamper proper defect analysis of the pipeline,such as wall thickness loss. This study is performed to reduce these reflections,while fulfilling the mechanical specifications of the acoustic *** UMASIS,a fully elastic 2D finite difference modeling tool,several configurations are *** is a very powerful tool for modeling and interpreting modeling *** thickness,orientation and shape of the acoustic window are *** modeled response provides accurate information about the dominant contributions to the internal *** snapshots generated with UMASIS,enable us to pinpoint the causes of *** drastically decreases the development time of the acoustical window and allows a significant reduction of the distortion of the acoustic window.

关键词： Optimization ultrasonic inspection Pipeline Modeling

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