超声衍射—回波渡越时间方法焊缝裂纹原位定量无损估计_其他工学

超声衍射—回波渡越时间方法焊缝裂纹原位定量无损估计

简介： 原文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，...

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原文

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：焊接超声波定量无损定征裂纹衍射—渡越时间方法
IN SITU QUANTITATIVE NONDESTRUC
TIVE EVALUATION OF THE WELDING
CRACK USING ULTRASONIC TIME OF
FL IGHT OF DIFFRACTIONECHO METHOD
Zhang Rui Wan Mingxi
（Xi’an Jiaotong University）
Cao Wenwu
（Pennsylvania State University,University Park,PA,16802）
Abstract In conjunction of the timeofflight diffraction method and the pulseecho method,an insitu ulttrasonic 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 sie of 2 mm of the steel welding plate can be charctanzed accuratoly.
Key words：Welding Utrasonic QNDE CrackTime of flight diffraction(TOFD)

0 前言
1 方法
2 试验
3 结论

参考资料

参考文献
1，Methods for Ultrasonic Examination of Welds.1986,BS 3923 Part 1
2，Doyle P A,Scala C M. Crack depth measurement by ultrasoncis.Ultrasonics,1978,16(4)∶164～169
3，Silk M G.The transfer of u1trasonic energy in the diffraction technique for crack sizing.Ultrasonics,1979,17(5)∶113～121
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5，Silk M G.An evaluation of the performance of the TOFD technique as a means of sizing flaws,with particular reference to flaws with curved profiles.INSIGHT,1996,38(4)∶280～287
6，Ismail M P,Muhammad A B.Defect sizing by u1trasonic ANDSCAN.INSIGHT,1998,40(11)∶769～771

超声衍射—回波渡越时间方法焊缝裂纹原位定量无损估计

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