• CN:11-2187/TH
  • ISSN:0577-6686

›› 2000, Vol. 36 ›› Issue (5): 54-57.

• 论文 • 上一篇    下一篇

超声衍射-回波渡越时间方法焊缝裂纹原位定量无损估计

张锐;万明习;Cao Wenwu   

  1. 西安交通大学电子与信息工程学院;Pennsylvania State University
  • 发布日期:2000-05-15

IN SITU QUANTITATIVE NON-DESTRUCTIVE EVALUATION OF THE WELDING CRACK USING ULTRASONIC TIME OF FLIGHT OF DIFFRACTION-ECHO METHOD

Zhang Rui;Wan Mingxi;Cao Wenwu   

  1. Xi'an Jiaotong University Pennsylvania State University
  • Published:2000-05-15

摘要: 提出结合衍射渡越时间方法和脉冲回波方法的超声波焊缝裂纹原位检测方法,对裂纹缺陷的位置与尺寸参数进行了定量无损估计。克服了衍射渡越时间方法难以对近焊件表面裂纹缺陷进行检测的弱点,也避免了为估计裂纹位置而进行的x轴扫描,提高了对焊缝的检测效率。分析了影响方法分辨率和准确度的各种因素,并采用中心频率为15MHz的检测超声波对钢板焊缝中不同位置和尺寸的裂纹进行了检测,试验结果证实该方法能够准确估计尺寸小到2mm的焊接裂纹。

关键词: 超声波, 定量无损定征, 焊接, 裂纹, 衍射-渡越时间方法

Abstract: In conjunction of the time-of-flight diffraction method and the pulse-echo method, and in-situ ultrasonic method for quantitative non-destructive evaluation of the welding crack’s position and zizing is presented. The deficiency of the time-of-flight diffraction method, the poor sensitivity for near-surface crack, is improved by pulse-echo method, and the demand of the x-axes scan can be omitted. The reason for the error, the factors which influence the resolution and accuracy of the method are analyzed. Using a pair of broadband longitudinal wave with 15MHz center frequency transducers, The position of a crack, with the size of 2mm of the steel welding plate can be charatanzed accurately.

Key words: Crack Time of flight diffraction (TOFD), Ultrasonic Q NDE, Welding

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