A Research on Diffraction Characteristics of TOFD Probes by Performence Testing
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摘要: 通过大量的衍射时差法(TOFD)检测试验,发现检测过程中探头发射的超声波在工件表面的入射点会随着探头间距的变化而移动,并得出探头的折射角会随着探头间距的增大而增大,同时探头的前沿距离和延迟时间变化不大的结论。另外,用TOFD对不同缺陷进行检测,记录了超声波在缺陷端部产生最大衍射效率时对应的探头折射角。试验结果表明该实际折射角大约在70°~80°,与探头的标称折射角没有必然的联系。Abstract: The incidence point of probe changed due to the variation of the distance between two probes while TOFD(time of flight diffraction) method was used. It was concluded by sufficient experiments that the refraction angle of probe enlarged while the distance between two probes increased. Meanwhile, the front distance and delay time of probe changed in an extent which could be neglected. Different flaws were tested by TOFD method to get the refraction angle of probe for the highest diffraction efficiency of ultrasonic waves from the tip of flaw. It was shown by tests that the actual refraction angle of probe was approximately 70°to 80°, and it was not affected by the labeled refraction angle.
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