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本文提出的以《缺陷定量图尺》调节仪器灵敏度及评定缺陷大小的方法,是根据AVG方法原理,结合我厂多年来在大型锻件超声波探伤中使用“距离——振幅”曲线评定缺陷大小的方法制定的。使用本方法,用汕头超声电子仪器厂生产的CTS-6型超声探伤仪(该仪器附有50dB衰减器,每档1dB,连续可调),采用2.5MHzφ20直探头,对大型锻件探伤,可以不需任何试块,而探伤结果具有良好的准确性。对距探测面50～500毫米的人工伤平底孔测试结果表明,其误差在±1dB以内,最大不超过2dB。
The method proposed in this paper to adjust the instrument sensitivity and evaluate the defect size is based on the principle of AVG method and combined with the “” distance-amplitude "curve of ultrasonic flaw detection in large forgings for many years to evaluate the defect size Method of development. Using this method, using CTS-6 ultrasonic flaw detector manufactured by Shantou Ultrasonic Electronic Instrument Factory (with 50dB attenuator, 1dB for each file continuously adjustable), using 2.5MHzφ20 straight probe, it is not necessary to inspect large forgings Need any test block, and the test results have good accuracy. The artificial flat bottom hole test of 50-500 mm from the detection surface shows that the error is within ± 1 dB and the maximum does not exceed 2 dB.