摘要
TOFD技术全称Time of Flight Diffraction(衍射时差法),是利用缺陷端部的衍射波的传播时间差进行缺陷定量的一种无损检测方法,在国外工业无损检测领域已得到广泛应用,欧、美、日均已推出相应的应用标准。近几年来,国内水电行业也在进行引进试用。介绍了应用TOFD法时,探头角度及间距的选择经验以及对拼板对接焊缝中气孔等缺陷检测中显示的图谱进行了分析。
TOFD, which means Time of Hight Diffraction, is a NDT technique, which quantitatively evaluates the defects using the Time of Flight Diffraction method of the ultrasonic waves. The technique has widely been used in field of industrial NDT abroad. EU, USA and Japan have already introduced relative standards for its application. In recent years Chinese hydropower companies start to import the technique for tryout. The paper introduces the experience in selecting probe angle and spacing when using the TOFD method and analyses the spectrogram presented from detecting of such defects as gas pockets in butt - jointed seams of splice plates.
出处
《云南水力发电》
2008年第4期76-78,共3页
Yunnan Water Power
