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钢管二维漏磁检测系统的再研究 总被引:9,自引:1,他引:8
基于二维磁化和缺陷漏磁原理的钢管自动化检测系统,采用集成化磁敏传感器、预放器降低系统的温度漂移,提高检测灵敏度和缺陷检测的再现性、可靠、性;特殊的滑环技术将多路信号归为一路传送;模拟缺陷信号的多种运算方式,可依用于检测钢管内壁各种缺陷;结合计算机测控技术,对检测全过程监测,分析、运算、存储缺陷信号参数,对缺陷标记、定位。 相似文献
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Keiji Tsukada Mitsuteru Yoshioka Toshihiko Kiwa Yoshinobu Hirano 《NDT & E International》2011,44(1):101-105
Spot welding is widely used for joining metal plates. However, a highly reliable monitoring method is needed to weld a robust structure. For this purpose, we developed a magnetic flux leakage (MFL) system using a magnetoresistive (MR) sensor for nondestructive spot-weld inspection. The magnetic flux is induced between two joined plates, and the magnetic flux leakage with a tangential component parallel to the plate surface is measured. A magnetic image at the spot-welding part is obtained by two-dimensional scanning. The connected diameter of the nugget and the maximum shear load are measured after the magnetic measurement to investigate their interrelationship. The results show that the nondestructive magnetic flux leakage test shows a good correlation with the destructive shear test. 相似文献
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在用管道漏磁检测装置的研制 总被引:7,自引:0,他引:7
将计算机技术,机电控制技术和信号处理技术与漏磁检测技术结合起来,研制成一种适用于野外作业的便携式管道缺陷漏磁检测装置,实验测试表明,该装置灵敏度及检测效率高,且成本低,在管道外侧一次扫查能检测出管道内外壁缺陷,在冶金,石油化工以及城市水暖供应等工业部门中具有广阔的应用前景。 相似文献
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MLT-I-B型抽油杆在线检测系统 总被引:1,自引:0,他引:1
为了满足快速检测和自动分选的需要,研制了MLT-I-B型抽油杆漏磁探伤机。该系统可实现抽油杆无盲区自动快速检测,对缺陷部分自动准确喷上标记,并对抽油杆进行自动分选,检测速度为25m/min。 相似文献
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L. Clapham T. W. Krause H. Olsen B. Ma D. L. Atherton P. Clark T. M. Holden 《NDT & E International》1995,28(2)
Gas pipelines are inspected for defects such as corrosion. The most commonly used nondestructive inspection tool uses the magnetic flux leakage (MFL) technique. The MFL signals depend on the magnetic behaviour of the pipe, which is sensitive to its microstructure and crystallographic texture as well as both residual and applied stresses. Here a section of commercial X70 pipeline is characterized using microstructural examination, X-ray diffraction (to determine crystallographic texture) and neutron diffraction (for residual stress measurement). The results correlate well with the manufacturing steps used for this type of pipe. Magnetic characterization is also performed using magnetic Barkhausen noise measurements, which reflect the magnetic anisotropy in the pipe and thus the MFL signal. These results do not correlate simply with crystallographic texture and residual strain results, but this is not unexpected given the complex nature of the material and its stress state. 相似文献