• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2020, Vol. 56 ›› Issue (14): 9-18.doi: 10.3901/JME.2020.14.009

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Study on Ultrasonic Multi-mode Composite Total Focusing Imaging Method for Welds Defect Inspection in Small-diameter Tube of Austenitic Stainless Steel

WU Bin1, YANG Jing1, JIAO Jingpin1, HE Cunfu1, QI Gaojun2   

  1. 1. College of Mechanical Engineering and Application Electronics Technology, Beijing University of Technology, Beijing 100124;
    2. POWERCHINA SEPCO1 Electric Power Construction Co., Ltd., Jinan 250100
  • Received:2019-06-09 Revised:2020-01-09 Online:2020-07-20 Published:2020-08-12

Abstract: Austenitic stainless steels are widely used in key components of major equipment, and welds are weak parts of the entire equipment. Ultrasonic wave have propagated in Austenitic stainless steels welds with the multi-path and multi-mode propagation characteristics. So the multi-mode ultrasonic phased array detection method for austenitic stainless steel small diameter pipe welds is studied. The detection ability of four different direct wave inspection modes and eight different primary reflection wave inspection modes for typical defects in small diameter pipe welds are compared and analyzed by numerical simulation. A fusion imaging method is developed based on a preferred direct wave detection mode and a bottom surface primary reflection detection mode. On this basis, weld defect detection experiment is carried out on the austenitic stainless steel small diameter pipe. The results show that the multi-mode fusion imaging method can realize the detection of multiple defects in small diameter tubes well. Compared with single mode total focusing imaging method, the fusion imaging method can not only improve the signal-to-noise ratio of imaging, but also greatly reduce the generation of artifacts. The project research work provides a feasible technical solution for the inspection of austenitic stainless steel small diameter pipe welds.

Key words: multi-mode TFM, composite imagine, phase array, austenitic stainless steel, welds

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