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Advances in magnetic flux leakage testing technology 被引量:7
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作者 ZHANG Peng WEI Minghui +1 位作者 GUO Zhiyong LIU Zhongxiang 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2021年第1期1-11,共11页
Magnetic flux leakage(MFL)testing technology has the advantages of simple principle,easy engineering implementation and low requirements on the surface of the detected workpiece.Therefore,it has been one of the resear... Magnetic flux leakage(MFL)testing technology has the advantages of simple principle,easy engineering implementation and low requirements on the surface of the detected workpiece.Therefore,it has been one of the research hotspots in the field of non-destructive testing(NDT)and widely used for testing long distance pipelines.This paper presents the development of MFL tesing technology from the aspects of basic theory,influencing factors,magnetization technology,signal processing,etc.The problems to be solved and the future development are summarized,which can provide reference for the research and system development of MFL testing technology. 展开更多
关键词 non-destructive testing(NDT) magnetic flux leakage(mfl)testing magnetization and detection signal processing
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Magnetic Flux Leakage Course of Inner Defects and Its Detectable Depth 被引量:4
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作者 Jianbo Wu Wenqiang Wu +1 位作者 Erlong Li Yihua Kang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2021年第4期110-120,共11页
As a promising non-destructive testing(NDT)method,magnetic flux leakage(MFL)testing has been widely used for steel structure inspection.However,MFL testing still faces a great challenge to detect inner defects.Existin... As a promising non-destructive testing(NDT)method,magnetic flux leakage(MFL)testing has been widely used for steel structure inspection.However,MFL testing still faces a great challenge to detect inner defects.Existing MFL course researches mainly focus on surface-breaking defects while that of inner defects is overlooked.In the paper,MFL course of inner defects is investigated by building magnetic circuit models,performing numerical simulations,and conducting MFL experiments.It is found that the near-surface wall has an enhancing effect on the MFL course due to higher permeability of steel than that of air.Further,a high-sensitivity MFL testing method consisting of Helmholtz coil magnetization and induction coil with a high permeability core is proposed to increase the detectable depth of inner defects.Experimental results show that inner defects with buried depth up to 80.0 mm can be detected,suggesting that the proposed MFL method has the potential to detect deeply-buried defects and has a promising future in the field of NDT. 展开更多
关键词 magnetic flux leakage(mfl)testing Inner defect Buried depth PERMEABILITY
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Evaluation of Surface Cracks Using Magnetic Flux LeakageTesting 被引量:3
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作者 Luming LI, Songling HUANG, Peng ZHENG and Keren SHINUT Center, Mechanical Engineering Department, Tsinghua University, Beijing 100084, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2002年第4期319-321,共3页
The magnetic field distribution characteristics of surface cracks with various widths are discussed based on finite element (FEM) results. The crack depth was 0.20 mm, the width range was from 0.02 to 1.00 mm. The res... The magnetic field distribution characteristics of surface cracks with various widths are discussed based on finite element (FEM) results. The crack depth was 0.20 mm, the width range was from 0.02 to 1.00 mm. The results showed that crack width and lift-off (the distance between surface and sensor) will influence signals. Discussed in this paper is the influence of various lift-off parameters on the peak to peak values of the normal component in magnetic flux leakage testing. The effects can be applied to evaluate surface breaking cracks of different widths and depths. An idea is presented to smooth narrow, sharp crack tips using alternating current (AC) field magnetization. 展开更多
关键词 magnetic flux leakage testing (mfl) Slot width Finite element method (FKM)
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Composite excitation multi-extension direction defect magnetic flux leakage detection technology 被引量:1
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作者 WEI Minghui TU Fengmiao +3 位作者 ZHANG Peng JIANG Lixia JIANG Pengbo JING Yu 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2022年第2期156-165,共10页
In the traditional pipeline magnetic flux leakage(MFL)detection technology,circumferential or axial excitation is mainly used to excite the magnetic field of defects.However,the domestic and foreign pipeline detection... In the traditional pipeline magnetic flux leakage(MFL)detection technology,circumferential or axial excitation is mainly used to excite the magnetic field of defects.However,the domestic and foreign pipeline detection devices currently in operation are mainly axial excitation MFL detection tools,in which circumferential cracks can be clearly identified,but the detection sensitivity of axial cracks is not high,thus forming a detection blind zone.Therefore,a composite excitation multi-extension direction defect MFL detection method is proposed,which can realize the simultaneous detection of axial and circumferential defects.On the basis of the electromagnetic theory Maxwell equation and Biot Savart law,a mathematical model of circumferential and axial magnetization is firstly established.Then finite element simulation software is used to establish a model of a new type of magnetic flux leakage detection device,and a simulation analysis of crack detection in multiple extension directions is carried out.Finally,under the conditions of the relationship model between the change rate of leakage magnetic field and external excitation intensity under unsaturated magnetization and the multi-stage coil magnetization model,the sample vehicle towing experiment is carried out.The paper aims to analyze the feasibility and effectiveness of the new magnetic flux leakage detection device for detecting defects in different extension directions.Based on the final experimental results,the new composite excitation multi extension direction leakage magnetic field detector has a good detection effect for defects in the axial and circumferential extension directions. 展开更多
关键词 composite excitation magnetic flux leakage(mfl) multi-extension direction defect pipeline detection
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Research on Magnetic Flux Leakage Detection Method for Subsea Pipeline 被引量:1
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作者 黄作英 阙沛文 杨崇倡 《Journal of Donghua University(English Edition)》 EI CAS 2004年第5期98-101,共4页
The intelligent pig based on the (MFL) is frequently used for in-line inspection of transportation pipelines. The article discusses the key technology of an MFL tool that includes the sensors structure, the constituti... The intelligent pig based on the (MFL) is frequently used for in-line inspection of transportation pipelines. The article discusses the key technology of an MFL tool that includes the sensors structure, the constitution of tool hardware, software and the analysis method of MFL signal. 展开更多
关键词 magnetic flux leakage pipeline inspection signal process
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Quantitative Interpretation for the Magnetic Flux Leakage Testing Data Based on Neural Network
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作者 SONG Xiaochun~(1.2) HUANG Songling~1 ZHAO Wei~1 1.State Key Lab of Power Systems,Dept.of Electrical Engineering,Tsinghna University,Beijing 100084,China 2.School of Mechanical Engineering,Hubei University of Technology,Wuhan 430068,China 《武汉理工大学学报》 CAS CSCD 北大核心 2006年第S2期443-447,共5页
In order to interpret the magnetic flux leakage (MFL) testing data quantitatively and size the defects accurately, some defect profiles inversion methods from the MFL signals are studied on the basis of the neural net... In order to interpret the magnetic flux leakage (MFL) testing data quantitatively and size the defects accurately, some defect profiles inversion methods from the MFL signals are studied on the basis of the neural network.Because the wavelet ba- sis function neural network (WBFNN) has good accuracy in the forward calculation and the radial basis function neural network (RBFNN) has reliable precision in the inversion modeling respectively,a new neural network scheme combining WBFNN and RBFNN is presented to solve the nonlinear inversion problem for the MFL data and reconstruct the defect shapes.And such details as the choice of wavelet basis function,the initialization of the weight value and the input normalization are analyzed,the train- ing and testing algorithm for the network are also studied.The inversion results demonstrate that the proposed network scheme has good reliability to interpret the MFL data for some defects. 展开更多
关键词 NEURAL networks magnetic flux leakage(mfl) QUANTITATIVE INTERPRETATION NONDESTRUCTIVE testing
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Influence of Slot Defect Length on Magnetic Flux Leakage
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作者 Songling HUANG, Luming LI, Haiqing YANG and Keren SHIDepartment of Electrical Engineering, Tsinghua University, Beijing 100084, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2004年第2期231-232,共2页
A key issue, which influences the applications of magnetic flux leakage testing, is defect quantification. There have been many research on the relationship between width, depth and magnetic flux leakage of slot defec... A key issue, which influences the applications of magnetic flux leakage testing, is defect quantification. There have been many research on the relationship between width, depth and magnetic flux leakage of slot defect. However, the length factor is often ignored. The relationship between characteristics of defect leakage field and defect length was investigated. The magnetic flux leakages of a series of plate specimens with the same width, same depth and different length slot defects were tested under the same magnetizing conditions. Testing results show that defect length is an important parameter needed to consider in quantifying defects. 展开更多
关键词 magnetic flux leakage (mfl) testing Defect quantification Slot length
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Coefficients de-noising with wavelet transform for magnetic flux leakage data obtained from oil pipeline
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作者 韩文花 Que Peiwen 《High Technology Letters》 EI CAS 2005年第4期406-409,共4页
This paper considers the problem of noise cancellation for the magnetic flux leakage (MFL) data obtained from the inspection of oil pipelines. MFL data is contaminated by various sources of noise, and the noise can co... This paper considers the problem of noise cancellation for the magnetic flux leakage (MFL) data obtained from the inspection of oil pipelines. MFL data is contaminated by various sources of noise, and the noise can considerably reduce the detectability of flaw signals in MFL data. This paper presents a new de-noising approach for removing the system noise contained in the MFL data by using the coefficients de-noising with wavelet transform. Experimental results are presented to demonstrate the advantages of this de-noising approach over the conventional wavelet de-noising method. 展开更多
关键词 magnetic flux leakage coefficients de-noising wavelet transform pipeline inspection system noise flaw signals
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Magnetic Flux Leakage Signal Inversion of Corrosive Flaws Based on Modified Genetic Local Search Algorithm
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作者 韩文花 杨平 +1 位作者 夏飞 薛阳 《Journal of Shanghai Jiaotong university(Science)》 EI 2009年第2期168-172,共5页
In this paper,a modified genetic local search algorithm(MGLSA) is proposed.The proposed algorithm is resulted from employing the simulated annealing technique to regulate the variance of the Gaussian mutation of the g... In this paper,a modified genetic local search algorithm(MGLSA) is proposed.The proposed algorithm is resulted from employing the simulated annealing technique to regulate the variance of the Gaussian mutation of the genetic local search algorithm(GLSA).Then,an MGLSA-based inverse algorithm is proposed for magnetic flux leakage(MFL) signal inversion of corrosive flaws,in which the MGLSA is used to solve the optimization problem in the MFL inverse problem.Experimental results demonstrate that the MGLSA-based inverse algorithm is more robust than GLSA-based inverse algorithm in the presence of noise in the measured MFL signals. 展开更多
关键词 magnetic flux leakage (mfl corrosive flaw simulated annealing Gaussian mutation
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Speed Measurement Feasibility by Eddy Current Effect in the High-Speed MFL Testing
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作者 Zhaoting Liu Jianbo Wu +4 位作者 Sha He Xin Rao Shiqiang Wang Shen Wang Wei Wei 《Structural Durability & Health Monitoring》 EI 2023年第4期299-314,共16页
It is known that eddy current effect has a great influence on magnetic flux leakage testing(MFL).Usually,contacttype encoder wheels are used to measure MFL testing speed to evaluate the effect and further compensate t... It is known that eddy current effect has a great influence on magnetic flux leakage testing(MFL).Usually,contacttype encoder wheels are used to measure MFL testing speed to evaluate the effect and further compensate testing signals.This speed measurement method is complicated,and inevitable abrasion and occasional slippage will reduce the measurement accuracy.In order to solve this problem,based on eddy current effect due to the relative movement,a speed measurement method is proposed,which is contactless and simple.In the high-speed MFL testing,eddy current induced in the specimen will cause an obvious modification to the applied field.This modified field,which is measured by Hall sensor,can be utilized to reflect the moving speed.Firstly,the measurement principle is illustrated based on Faraday’s law.Then,dynamic finite element simulations are conducted to investigate the modified magnetic field distribution.Finally,laboratory experiments are performed to validate the feasibility of the proposed method.The results show that Bmz(r1)and Bmx(r2)have a linear relation with moving speed,which could be used as an alternative measurement parameter. 展开更多
关键词 magnetic flux leakage testing(mfl) speed measurement eddy current effect modified magnetic field
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The MFL Testing Methods for Welded Pipes
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作者 孙燕华 伍剑波 康宜华 《Journal of Measurement Science and Instrumentation》 CAS 2011年第4期330-332,共3页
Steel pipes are categorized into seamless pipes and welded pipes,and particularly the welded pipes’ NDT(Non-Destructive Testing)has been a challenging problem.In the case,on the basis of the presentation of welded pi... Steel pipes are categorized into seamless pipes and welded pipes,and particularly the welded pipes’ NDT(Non-Destructive Testing)has been a challenging problem.In the case,on the basis of the presentation of welded pipes,the analysis of its relevant testing key is carried out.Afterwards,the MFL(Magnetic Flux Leakage)methods for longitudinally welded line-pipes and for helically welded pipes are respectively proposed.Meanwhile,their relevant experiments are conducted,and finally the two technologies for the two types of welded pipes are verified well. 展开更多
关键词 NDT (Non-Destructive Testing mfl magnetic flux leakage welded pipe longitudinallywelded pipe spirally welded pipe
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柔性钻柱扭转振动及控制研究
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作者 姜寅令 张周 +2 位作者 张强 刘可 竺可 《石油矿场机械》 CAS 2024年第4期18-27,共10页
在旋转钻井中,钻杆承担着传递扭矩以助钻头破岩的重要作用,钻杆的粘滑振动是降低钻井设备使用寿命和钻进效率的主要原因之一,因此,通过研究粘滑振动的机理,探寻一种有效的抑制方法。提出了基于改进粒子群优化PID参数的鲁棒控制器,抑制... 在旋转钻井中,钻杆承担着传递扭矩以助钻头破岩的重要作用,钻杆的粘滑振动是降低钻井设备使用寿命和钻进效率的主要原因之一,因此,通过研究粘滑振动的机理,探寻一种有效的抑制方法。提出了基于改进粒子群优化PID参数的鲁棒控制器,抑制钻头的粘滑振动并且使得其它部件保持期望的速度上。采用四自由度粘滑振动模型,包括转盘、钻杆、钻铤和钻头,同时考虑钻头与岩石接触的非线性相互作用。利用Matlab/Simulink建立模型仿真进行数值分析,并且设计模拟钻头卡钻实验。结果表明:粘滑现象会带来严重的后果,改进的粒子群优化PID参数可以使钻头及其他部件稳定在给定的转速的附近,控制响应时间小于40 s,减少了钻头扭矩波动,有效地抑制了钻柱粘滑振动。 展开更多
关键词 钻柱 扭转振动 粒子群优化 PID控制 模型
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多通道钢丝绳的漏磁检测信号融合方法 被引量:2
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作者 关益辉 孙燕华 +1 位作者 高尚磊 张义军 《无损检测》 CAS 2024年第5期56-61,共6页
分析了现有钢丝绳漏磁检测系统中存在的损伤信号幅值较小、前端多个磁敏元件处理方式较为简单等问题,提出了一种钢丝绳漏磁检测系统中的多通道信号融合方法。首先从磁敏元件阵列的角度出发,提出了多种磁敏元件阵列方式;其次从信号处理... 分析了现有钢丝绳漏磁检测系统中存在的损伤信号幅值较小、前端多个磁敏元件处理方式较为简单等问题,提出了一种钢丝绳漏磁检测系统中的多通道信号融合方法。首先从磁敏元件阵列的角度出发,提出了多种磁敏元件阵列方式;其次从信号处理模拟电路的角度出发,设计了多通道信号融合硬件电路;最后,针对钢丝绳进行了实际测试,验证了此方法的可行性。 展开更多
关键词 钢丝绳 漏磁检测 磁敏元件阵列 多通道信号融合 加法电路
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基于PCC-LPSO-BP的油气管道缺陷分类识别研究
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作者 黄书童 贾晓丽 《石油矿场机械》 CAS 2024年第4期1-9,共9页
为准确识别油气管道的缺陷类型,分析缺陷漏磁信号特征对识别精度的影响,建立了基于PCC-LPSO-BP的油气管道缺陷识别模型。采用皮尔逊相关系数法(PCC)分析了缺陷漏磁信号特征量与缺陷尺寸间的相关程度,建立了混沌映射和莱维飞行改进的粒... 为准确识别油气管道的缺陷类型,分析缺陷漏磁信号特征对识别精度的影响,建立了基于PCC-LPSO-BP的油气管道缺陷识别模型。采用皮尔逊相关系数法(PCC)分析了缺陷漏磁信号特征量与缺陷尺寸间的相关程度,建立了混沌映射和莱维飞行改进的粒子群优化后的BP神经网络识别模型即LPSO-BP模型,采用评价指标综合比较了模型的识别效果,分析了该识别模型对各缺陷类型的识别精度以及各特征量对识别结果的影响。研究结果表明:LPSO-BP模型相较于BP模型识别精度提高了7.47%,且在现有的数据范围内对表面剥落和裂纹的识别率达到了100%。研究结果对油气管道缺陷识别量化具有一定的参考价值。 展开更多
关键词 漏磁信号 缺陷识别 皮尔逊相关系数 LPSO-BP模型
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变板厚漏磁信号有限元仿真分析
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作者 李冰鹃 张璐 +2 位作者 段特 李宁娟 董军堂 《延安大学学报(自然科学版)》 2024年第2期116-120,共5页
为了分析漏磁检测中不同缺陷深度及测试件厚度对缺陷漏磁信号的影响,基于漏磁检测技术基本原理,借助COMSOL有限元仿真分析软件,采用横向励磁方法对圆柱缺陷的漏磁场分布特征进行三维有限元模型建立,对缺陷漏磁场在不同影响因素条件下进... 为了分析漏磁检测中不同缺陷深度及测试件厚度对缺陷漏磁信号的影响,基于漏磁检测技术基本原理,借助COMSOL有限元仿真分析软件,采用横向励磁方法对圆柱缺陷的漏磁场分布特征进行三维有限元模型建立,对缺陷漏磁场在不同影响因素条件下进行了仿真研究。结果表明,得到的漏磁场磁力线与理论分析结果一致;测试件厚度及缺陷深度均对不同缺陷半径有不同的检测性能,根据所提的评价方法来区分检测性能的优劣,最终得出对于不同测试板厚度的恒深度(8 mm)缺陷及测试板厚度的40%缺陷深度,均适用于12~32 mm测试件厚度的磁化器结构参数。研究结果对励磁结构的优化设计具有一定的参考价值。 展开更多
关键词 漏磁信号 横向励磁 圆柱缺陷 有限元仿真
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运载火箭电磁阀漏磁特性量化研究与极性检测系统设计
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作者 徐文晓 卢頔 +1 位作者 李璨 张学英 《计算机测量与控制》 2024年第6期7-13,共7页
传统的运载火箭电磁阀极性测试往往通过“耳听手摸”的方式,故存在漏检误检、测试记录不可量化及数据追溯、无法精准判读、测试效率低等问题;因此对运载火箭典型姿控电磁阀开展了漏磁性能的测量与量化分析,掌握阀体各部位漏磁场分布规... 传统的运载火箭电磁阀极性测试往往通过“耳听手摸”的方式,故存在漏检误检、测试记录不可量化及数据追溯、无法精准判读、测试效率低等问题;因此对运载火箭典型姿控电磁阀开展了漏磁性能的测量与量化分析,掌握阀体各部位漏磁场分布规律、漏磁场随距离衰减变化规律、电磁阀之间漏磁场相互影响情况,并提出了一种非接触式的可视化电磁阀极性检测系统设计方法,采用三冗余敏感探头采编设计保证极性检测准确性,经试验测试验证,实现了无需精确安装即可100%检测电磁阀动作及时序动作精准判读,提升了电磁阀极性检测能力和测试效率;该系统已成功应用于大型运载火箭的总装测试流程中,对于提升运载火箭自动化测试水平具有重要意义。 展开更多
关键词 运载火箭 电磁阀 漏磁性能 极性检测
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油气管道典型渐变缺陷的漏磁特征研究
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作者 陈鸵 朱波 +1 位作者 路辉 祝卫国 《焊管》 2024年第6期17-21,38,共6页
基于漏磁检测技术,建立了油气管道典型渐变缺陷的有限元仿真模型,通过分析缺陷类型、几何尺寸对漏磁场的影响,进一步探究了缺陷截面形状特征参数与漏磁信号的对应关系,分析不同缺陷漏磁信号特征的变化规律,对于提高缺陷识别与量化的精... 基于漏磁检测技术,建立了油气管道典型渐变缺陷的有限元仿真模型,通过分析缺陷类型、几何尺寸对漏磁场的影响,进一步探究了缺陷截面形状特征参数与漏磁信号的对应关系,分析不同缺陷漏磁信号特征的变化规律,对于提高缺陷识别与量化的精度、丰富缺陷样本数据库至关重要。以梯形、阶梯形典型渐变缺陷为研究对象,通过开展仿真模拟研究,进一步探究梯形缺陷与阶梯形缺陷特征参数与漏磁信号的对应关系,为缺陷漏磁场的定性和定量分析提供参考。 展开更多
关键词 漏磁信号 典型渐变缺陷 仿真模拟 油气管道
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基于漏磁检测原理的钢缆智能检测方法研究
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作者 许天一 王恒 +1 位作者 沈云堃 居楠 《现代信息科技》 2024年第21期135-138,147,共5页
针对目前钢缆智能检测装置对钢缆内部磁化强度弱、漏磁信号弱、磁化不均匀,从而导致检测效率低、检测难度大、分析定位弱的问题,提出一种钢缆智能检测方法,通过仿真模拟、设备优化和信号采集与处理等过程,实现对钢缆损伤情况的准确检测... 针对目前钢缆智能检测装置对钢缆内部磁化强度弱、漏磁信号弱、磁化不均匀,从而导致检测效率低、检测难度大、分析定位弱的问题,提出一种钢缆智能检测方法,通过仿真模拟、设备优化和信号采集与处理等过程,实现对钢缆损伤情况的准确检测。同时采用了基于ICEEMDAN和WT的联合降噪方法,通过对实际钢缆的检测,验证了所提方案的可行性和准确性,为钢缆智能检测装置的设计与应用提供了实用的技术支持。 展开更多
关键词 电磁场 钢缆智能检测 漏磁检测 ANSYS仿真 信号降噪
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管道缺陷漏磁检测的三维有限元仿真分析 被引量:11
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作者 郑彪华 何文 +2 位作者 周松强 张春雷 高忠 《中国安全科学学报》 CAS CSCD 北大核心 2013年第12期35-41,共7页
为研究运输管道缺陷的漏磁(MFL)信号特征,采用ANSYS软件进行管道缺陷漏磁检测的三维有限元数值仿真。首先建立漏磁检测分析装置的数值模型,进行三维静态情况的数值计算,获得不同缺陷所产生的漏磁信号,然后将这些数据与试验结果进... 为研究运输管道缺陷的漏磁(MFL)信号特征,采用ANSYS软件进行管道缺陷漏磁检测的三维有限元数值仿真。首先建立漏磁检测分析装置的数值模型,进行三维静态情况的数值计算,获得不同缺陷所产生的漏磁信号,然后将这些数据与试验结果进行比较分析。在此基础上,分析缺陷深度、缺陷直径以及传感器提离值对漏磁信号参数的影响。结果表明:磁通密度轴向分量By的幅值能够用于衡量缺陷的深度,可依据By的宽度和磁通密度径向分量Bx的峰峰间距来定量识别缺陷直径;传感器的提离值对缺陷漏磁场的影响很大,为使测得的漏磁信号可靠并能测得深度较小的缺陷,传感器的提离值应设定为1.5~3mm。 展开更多
关键词 管道 缺陷 漏磁(mfl)检测 有限元分析 ANSYS 磁通密度 提离值
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基于单一轴向磁化的钢管高速漏磁检测方法 被引量:24
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作者 孙燕华 康宜华 石晓鹏 《机械工程学报》 EI CAS CSCD 北大核心 2010年第10期8-13,共6页
介绍现有复合磁化漏磁检测方法与装置并分析其局限性:相对螺旋推进的扫查探伤方式限制探伤速度,也难以完成不宜作旋转运动或带直线焊缝的钢管的检测。针对此问题,通过有限元仿真和试验的方法,发现并证实单一轴向磁化下检测钢管上任意方... 介绍现有复合磁化漏磁检测方法与装置并分析其局限性:相对螺旋推进的扫查探伤方式限制探伤速度,也难以完成不宜作旋转运动或带直线焊缝的钢管的检测。针对此问题,通过有限元仿真和试验的方法,发现并证实单一轴向磁化下检测钢管上任意方向伤的可能性,尤其是探测钢管上平行于轴向磁感应场的纵向伤的可行性,使得相对直线扫查的探伤成为可能。研究在单一轴向磁化下钢管上纵、横向伤检测信号的特征及其归一化判断;提出一种无需检测探头或钢管旋转的漏磁检测方法并研制出相应的探伤装置,解决无缝钢管生产线上的高速或超高速探伤问题,尤其是自身难以作螺旋推进运动的如连续油管等钢管及焊缝管的直线焊缝上缺陷的快速探伤;同时简化统一传统漏磁检测方法,降低设备成本。 展开更多
关键词 漏磁 无损检测 轴向磁化 钢管 高速
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