发电机护环内壁缺陷TOFD检测优化

doi:10.11930/j.issn.1004-9649.2014.3.65.3

中国电力 ›› 2014, Vol. 47 ›› Issue (3): 65-68.DOI: 10.11930/j.issn.1004-9649.2014.3.65.3

发电机护环内壁缺陷TOFD检测优化

代真¹, 李伟¹, 郝晓军², 刘红权¹, 敬尚前²

1. 国电科学技术研究院,江苏南京 210031；
2. 河北省电力公司电力科学研究院,河北石家庄 050021

收稿日期:2013-12-14 出版日期:2014-03-31 发布日期:2015-12-18
作者简介:代真（1982-）,男,硕士毕业,工程师,主要从事电站高温设备及管道的可靠性研究。E-mail: hbdygj@163.com

Optimization of TOFD Detection for Generator Retaining Ring with Inner Wall Defect

DAI Zhen¹, LI Wei¹, HAO Xiao-jun², LIU Hong-quan¹, JING Shang-qian²

1. Guodian Science and Technology Research Institute, Nanjing 210031, China;
2. Hebei Electric Power Research Institute, Shijiazhuang 050021, China

Received:2013-12-14 Online:2014-03-31 Published:2015-12-18

摘要/Abstract

摘要： 超声波衍射时差法（TOFD）检测设备缺陷多采用45°、60°、70° 3种常规探头。基于发电机护环的壁厚和材质特性,即便采作45°探头也无法对其内壁缺陷进行准确评定。为此对TOFD检测工艺进行了优化设计,在分析衍射声波传播特性的基础上,提出了20°探头的检测模式,并研制出20°探头。通过对发电机护环内壁自然裂纹进行检测,确定出最佳检测频率为2.25 MHz。在该频率下对模拟缺陷试块进行检测,所得结果与实际情况吻合良好。研究得到的适合发电机护环内壁缺陷的最佳TOFD检测工艺为：20°探头,2.25 MHz频率,晶片直径12 mm,声束聚焦深度为护环内壁。按此工艺对壁厚50 mm以内的发电机护环进行检测,能够检出内壁缺陷的最小临界尺寸为2 mm高。

关键词: 发电机护环, 缺陷检测, 超声波, TOFD, 20°, 探头

Abstract: Probes for ultrasonic time of flight diffraction (TOFD) are considered to be conventional, such as 45°, 60° and 70°. Austenitic steel is widely used in generator retaining ring. Coarse grain size and large thickness play an aggravating role in acoustic wave attenuation. Inner wall defect can not be detected accurately even 45° probe is used. In order to optimize the detection process, the 20° probe is proposed based on analysing of the characteristic of acoustic wave. Through TOFD detection of inner wall with natural crack, the optimal frequency (2.25MHz) is determined. And artificial defect detection is in good agreement with actual fact by the optimal frequency. So the optimum detection process is 20° probe, 2.25MHz, transducer diameter of 12mm. And beam is focused on inner wall of generator retaining ring. By optimization detection process, inner wall artificial defect with height of 2mm can be effectively distinguished in generator retaining ring with thickness of 50mm.

Key words: Generator retaining ring, defect detection, acoustic wave, TOFD, 20°, probe

中图分类号:

代真, 李伟, 郝晓军, 刘红权, 敬尚前. 发电机护环内壁缺陷TOFD检测优化[J]. 中国电力, 2014, 47(3): 65-68.

DAI Zhen, LI Wei, HAO Xiao-jun, LIU Hong-quan, JING Shang-qian. Optimization of TOFD Detection for Generator Retaining Ring with Inner Wall Defect[J]. Electric Power, 2014, 47(3): 65-68.

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发电机护环内壁缺陷TOFD检测优化

Optimization of TOFD Detection for Generator Retaining Ring with Inner Wall Defect

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