Simulation Research on Restraining End Effect of Eddy Current Testing for Fillet Welds in Tube Sheets
-
摘要: 针对管板角焊缝结构涡流检测的特点，研究了影响常规涡流检测实施的相关因素（包括外形、材料等），并在此基础上采用ANSYS有限元仿真技术对专用的传感器进行了优化设计，增加了永磁磁化单元，结合抑制涡流检测端部效应的信号处理方法，减小了端部检测盲区范围，提高了焊缝缺陷的检测精度。仿真和试验结果表明，通过对管壁和焊缝施加磁化及对检测信号进行差分处理，能够实现薄壁管管板角焊缝深层缺陷的检测，证明了管板焊缝结构涡流检测的可行性，提高了管板涡流检测的效率。Abstract: In view of the characteristics of eddy current testing of fillet welds in tube sheets, the relevant factors affecting the implementation of conventional eddy current testing (including shape, material, etc.) are investigated. On this basis, the ANSYS finite element simulation technology is used to optimize the design of the special sensor. The permanent magnet is added, and the signal processing method of restraining the end effect of eddy current testing is adopted, thereby reducing the range of the end detection dead zone and improving the detection accuracy of weld defects. The simulation and experimental results showed that it could realize those deep defects detection in the fillet weld of thin-walled tubes plate when magnetization was applied to the pipe wall and differential processing means was undertaken for the detection signals, proving the feasibility of eddy current testing for the tube plate welding structure and improving the detection efficiency.
-
-
[1] 高春华,张文国. 渗透检测在换热器管板上的应用和影响因素分析[J]. 炼油与化工,2010,21(3):33-35. [2] 王红明,李广云,肖广建,等. 核电蒸汽发生器管板单目视觉检测系统研究[J]. 光学仪器,2007,29(6):4-7. [3] 张颖,张盛瑀,戴光,等. 换热器管板声发射在线检测及评价方法[J]. 无损检测,2013,35(12):28-31,57. [4] 强天鹏,徐卫,陈雁康,等. 管子-管板焊缝的射线照相无损检测技术[J].化工设备与管道,2008,45(6):12-14. [5] THEDDOROS T. End effect modelling in eddy current tube testing with bobbin coils[J]. International Journal of Applied Electromagnetics and Mechanics,2004,19:207-212.
[6] JOHN R B, THEODOROS P T, NIKOLAOS P. Eddy current probe signals due to a crack at a right-angled corner[J]. IEEE Transactions on Magnetics,2012,48(12):4735-4746.
[7] THEODOROS P T, NIKOLAOS P, JOHN R B. Evaluation of eddy current probe signals due to interaction with edge crack[J]. Studies in Applied Electromagnetics & Mechanics,2010,33(5):9-17.
[8] BURKE S K. Eddy current induction by a coil near a conducting edge 2D[J]. Review of Progress in Quantitative Nondestructive Evaluation,1987,6:169-175.
[9] 吴干林. 涡流检测头尾信号切除新方法[J]. 无损检测,2001,23(2):78-78,81. [10] 赵洪贤,李庆卓,孙继华,等. 减小穿过线圈式涡流探伤不可探区长度的研究[J]. 山东科学,2011,24(1):106-108. [11] 丁昱程,丁建国. 涡流检测时端部(或边缘)检测盲区消除技术:中国,200710066674.1[P]. 2007-01-11. [12] GB 150-2011钢制压力容器[S]. [13] GB 151-1999管壳式换热器[S]. [14] 万本例,张路根, 胡智,等.钢管饱和磁化下涡流检测有限元仿真研究[J].制造业自动化,2011,33(8):116-119. [15] 龚曙光,谢桂兰. ANSYS操作命令与参数化编程[M]. 北京:机械工业出版社,2003.
计量
- 文章访问数: 2
- HTML全文浏览量: 0
- PDF下载量: 1
下载:
