Eddy Current Impedance Analysis for Testing of Defect Depths on Stainless Steel Pipes
-
摘要: 在利用外穿过式线圈对不锈钢管件进行涡流检测时, 发现深度分别为0.10, 0.15和0.20 mm的三种裂纹无法利用检测信号的相位角进行识别。针对这一现象, 利用阻抗分析方法进行了计算, 得出在不同检测频率下, 管件表面从0.10~1.90 mm不同深度裂纹的相位角, 以及上述无法区分的三种缺陷的幅值。在此基础上, 制作了带有人工缺陷的试样管件并对其进行涡流检测。检测结果表明, 根据检测信号幅值的大小, 可将深度差异为0.05 mm的人工缺陷区分开, 且检测结果稳定可靠。Abstract: An encircling coil had been employed to test the defects of stainless steel pipes in eddy current testing. However, the defects with depth of 0.10, 0.15 and 0.20 mm could not be distinguished with the corresponding differences in phase-angles of testing signals which was always true according to the principle of skin effects. Aiming at dealing with this problem, impedance analysis which could show the calculating phase-angles and amplitudes of simulating signal of defects was applied. We calculated phase-angles with depth of defects ranging from 010 mm to 190 mm and amplitude of three depths as shown above. The stainless steel pipes with man-made defects on the surfaces were also made for eddy current testing. The results indicated that defects of 0.10 mm could be found and depth differences of 0.05 mm could be distinguished with the amplitudes which were much more stable and reliable than the phase-angles.
-
Keywords:
- Eddy current testing /
- Impedance analysis /
- Stainless steel pipes /
- Defect depth
-
-
[1] 徐可北, 周俊华.涡流检测［M］.北京: 机械工业出版社, 2004. [2] 段权, 王丽丽, 胡时岳.非磁性材料抽油杆裂纹的涡流在线检测方法［J］.西安交通大学学报, 1998, 32(1): 53-56. [3] 王琪, 王志, 陈健, 等.应用涡流检测原理实现裂纹快速测探［J］.石油矿场机械, 2002, 31(6): 59-60. [4] 段权, 程光旭.在役压力容器疲劳裂纹的涡流无损检测方法研究［J］.化工机械, 2000, 27(4): 208- 210. [5] 伍颂, 赵建华.火箭发动机用薄壁合金管涡流特性分析［J］.宇航材料工艺, 2003, 33(2): 53-57. [6] 叶波, 黄平捷, 周泽魁.涡流检测探头提离变化对阻抗的影响及消除技术［J］.仪器仪表学报, 2005, 26(8): 732-734, 737. [7] Frédéric Thollon, Bruno Lebruno, Nol Burais, et al. Numerical and experimental study of eddy current probes in N DT of structures with deep flaws［J］. NDT&E International, 1995, 28(2): 97-102. [8] 美国无损检测学会.美国无损检测手册·电磁卷［M］.《美国无损检测手册》译审委员会, 译.上海: 世界图书出版社, 1996. [9] 刘颖, 徐彦霖, 王增勇.外径小于3 mm的奥氏体不锈钢管材涡流检测技术研究［J］. 无损检测, 2000, 22(9): 409-412, 416. [10] Huang H, Endo H, Uchimoto T, et al. Eddy current testing and sizing of deep cracks in a thick structure［J］. Review of Quantitative Nondestructive Evaluation, 2004, 700(23): 659-666.
计量
- 文章访问数: 3
- HTML全文浏览量: 1
- PDF下载量: 1
下载:
