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奥氏体不锈钢换热器管的涡< 流检测
沈建民,邱法聚,王小华
(宁波市特种设备检验检测中心,宁波 315020)
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摘要:介绍采用双频涡流技术检测奥氏体不锈钢换热器管。在对比样管上的检测试验发现,
样管上的相位壁厚减薄曲线与各类文献中的缺陷标准曲线存在较大差异。比较了自然缺陷与人
工缺陷信号间的差异,分析了因换热器管在制造过程中形成的台阶状壁厚变化导致的伪缺陷信号。
利用幅相报警功能可辅助监控被检区域。结果表明,涡流检测速度快、成本低,可有效应用于奥氏
体不锈钢换热器管的检测。
关键词:涡流检测;奥氏体不锈钢;换热管;信号;缺陷
中图分类号: T G115. 28 文献标识码:A 文章编号:1000 6656 (2008) 08 0547 03
Eddy Current Testing of Austenitic Stainless Steel Heat Exchanger Tube
SHEN Jian Min , QIU Fa Ju , WANG Xiao Hua
(Ningbo Special Equipment Inspection Center , Ningbo 315020 , China)
Abstract : Double frequency method of conventional eddy current testing technology to inspect the austenitic
stainless steel heat exchanger tube was introduced. It showed that the curve of phase against thickness decrease was
greatly different from the stand curve in several kinds of literatures. The difference between the nature defect and
artificial defect signals pared , and the false defect signal excited by step change of thickness in heat
exchanger tube formed in manufacturing process was analyzed. Defect could be inspected by the assistant function
(Altitude Phase Warning) . Through the analysis of the value of eddy current testing , it conclude that eddy current
testing was in advantage of high speed , low prices , and being effect in inspecting the