Eddy Current Testing Technology for Inner Wall Defects of Stainless Steel for Nuclear Vessel and Pipeline

Ming ZHU; Xiaohua CHEN; Hulong ZHANG; Yu SHI

doi:10.7512/j.issn.1001-2303.2022.07.05

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Eddy Current Testing Technology for Inner Wall Defects of Stainless Steel for Nuclear Vessel and Pipeline
Vol. 52, Issue 7, Pages: 34-38(2022)
Received：25 January 2022，

Revised：2022-03-30，

Published：25 July 2022
DOI： 10.7512/j.issn.1001-2303.2022.07.05
稿件说明：

移动端阅览

朱明，谌晓华，张虎龙，等.面向核容器及管路的不锈钢内壁缺陷涡流检测工艺［J］.电焊机，2022，52（7）：34-38. DOI： 10.7512/j.issn.1001-2303.2022.07.05.

ZHU Ming, CHEN Xiaohua, ZHANG Hulong, et al.Eddy Current Testing Technology for Inner Wall Defects of StainlessSteel for Nuclear Vessel and Pipeline[J].Electric Welding Machine, 2022, 52(7): 34-38. DOI： 10.7512/j.issn.1001-2303.2022.07.05.

摘要

针对大厚度不锈钢核容器及管路在放射环境下易从内壁产生腐蚀缺陷，并向外壁扩展直至产生表面泄漏的问题，需要采用适合的无损检测手段进行在役监测，保证服役安全。涡流检测方法具有不引入额外介质、易于实现自动化等优点，可满足典型核容器的特殊检测要求。为更好地检测核容器内壁缺陷，设计了专用涡流检测装置，搭建了以机器人为载体的涡流自动检测系统，通过提取阻抗图幅值、相位、包络面积及与

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1.43933344

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轴交点最大值作为表征涡流检测阻抗图的几何特征参数，开展了不同缺陷深度的模拟试样涡流检测研究。结果表明：设计的系统能对距上表面6 mm以内的缺陷做出有效响应；幅值、包络面积、与

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轴交点最大值三个特征参数能很好地反应缺陷深度信息，而相位特征参数随深度增大呈无规律变化。

Abstract

In view of the problem that the large thickness stainless steel nuclear vessel and pipeline are easy to produce corrosion defects from the inner wall and expand to the outer wall until surface leakage in the radiation environment

suitable nondestructive testing means should be used for in-service monitoring to ensure service safety. The eddy current testing method has the advantages of no additional medium

easy to realize automation

and etc.

which can meet the special testing requirements of typical nuclear vessels. In order to better detect the inner wall defects of the nuclear container

a special eddy current detection device is designed

and an eddy current automatic detection system based on robot is built. By extracting the amplitude

phase

the envelope area and the maximum value of the intersection with the

-axis are used as the geometric characteristic parameters of the eddy current testing impedance diagram and the eddy current testing of simulated samples with different defect depths is carried out. The results show that: the designed experimental system can effectively respond to defects within 6mm from the upper surface; the three characteristic parameters of amplitude

envelope area and the maximum value of intersection with

-axis can well reflect the defect depth information

while the phase characteristic parameters change irregularly with the increase of depth.

关键词

Keywords

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