基于全聚焦相控阵和电磁超声的液氨储罐母材带状组织检测分析

doi:10.3969/j.issn.1006-8805.2021.01.012

Petro-chemical Equipment Technology ›› 2021, Vol. 42 ›› Issue (1): 53-57.doi: 10.3969/j.issn.1006-8805.2021.01.012

• CONDITION MONITORING AND ANALYSIS • Previous Articles Next Articles

Research on Banded Structure in Base Metal of Liquid Ammonia Tank Using TFM and EMAT Technique

Qian Shengjie, He Tongdong, Li Binbin, Wang Du

Ningbo Special Equipment Inspection and Research Institute, Ningbo, Zhejiang, 315048

Received:2020-09-25 Accepted:2020-12-25 Online:2021-01-29 Published:2021-01-29

Abstract

Abstract: The abnormal wall thickness of a liquid ammonia tank was detected and analyzed by means of TFM and EMAT in this paper during the periodic inspection. At first, the characteristics of the two detection techniques, the status of inspection and detection are introduced. Then, EMAT is used to quickly identify the abnormal thickness area, and the cause of abnormal wall thickness is preliminarily determined. Furthermore, TFM is used to accurately detect the specific distribution, echo size and morphology of defects. Finally, according to the detection results, the author determines that the defect is a non-metallic inclusion in the steel plate forming intermittent band structure during rolling. Through the detection and analysis of the banded structure of the base metal described in this paper, it is helpful for the engineers to diagnose the difficult defects in the actual inspection.

Key words: total focusing method/TFM, phased array, electromagnetic acoustic transducer/EMAT, zonal structure

Qian Shengjie, He Tongdong, Li Binbin, Wang Du. Research on Banded Structure in Base Metal of Liquid Ammonia Tank Using TFM and EMAT Technique[J].Petro-chemical Equipment Technology, 2021, 42(1): 53-57.

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Research on Banded Structure in Base Metal of Liquid Ammonia Tank Using TFM and EMAT Technique

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