现场检测锻件缺陷时,缺陷延伸长度往往是很多标准的重要评判参数,但是由于超声波声束直径的影响,缺陷测量长度与实际长度相差很大,对检测结果的评定带来了很大的影响.采用缺陷动态波形图来判断缺陷是否有点状缺陷和延伸性缺陷性质,再以缺陷当量值和6dB法测量值来衡量缺陷延伸长度,以此作为缺陷评定的数据,从而减少误判,提高检测结果的可信度.

When measuring the imperfections of forging pieces at site,the measurement of imperfection extended length is an important judgment parameter for many standards.Because of the influence of sound beam diameter of ultrasonic wave,there shall be a big difference between the gage length and actual length of imperfections,which will exert big influence to the judgment of measurement.The article is to use the dynamic oscillogram of imperfections to check if the imperfections with the punctulation imperfection property and imperfection extensibility property,and use imperfection equivalent value and 6dB measured value to judge the extended length of imperfections,so as to decrease the erroneous judgment and to improve the credibility of inspection result and decrease the economic loss.