如何使超声波探伤仪能直接指示缺陷当量大小和提高探测精度,这是超声探伤技术中一个迫切需要解决的问题。近年来上海汽轮机厂、上海锅炉厂、哈尔滨汽轮机厂等单位利用国内生产的带有分贝衰减器的探伤仪,应用AVG方法原理,由衰减器测出回波幅度的分贝值,经过计算可以得出缺陷的当量大小,并且设计出《缺陷定量图尺》和《缺陷当量计算尺》。此种方法对仪器的垂直线性要求不高,因而目前一般使用的探伤仪也能应用AVG法进行探伤,但操作比较麻烦。利用数学物理方法计算的AVG线图,可以制作成曲线板套在探伤仪萤光屏上,直接读出缺陷的当量 How to make the ultrasonic flaw detector directly indicate the defect equivalent size and improve the detection accuracy is an urgent problem to be solved in the ultrasonic flaw detection technology. In recent years, Shanghai Steam Turbine Works, Shanghai Boiler Works, Harbin Turbine Works and other units using domestic manufacturers with a decibel attenuator flaw detector, the principle of AVG method, measured by the attenuator echo amplitude decibels, calculated can be drawn Defect equivalent size, and design a “quantitative defect scale” and “defect equivalent weight scale.” This method of vertical linearity of the instrument is not demanding, so the general use of flaw detector AVG method can also be used for flaw detection, but the operation is too much trouble. AVG line diagram calculated using mathematical physics can be made into a curved plate set flasher flaw detector directly read the defect equivalent