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近年来,采用超声波检验焊缝的方法正在日益发展,为比较确切地反映焊缝中的实际情况,选择先进的参考块,以便提供适当的探伤灵敏度是很迫切的。目前国内采用的横波灵敏度试块,多是苏联的三角形平底孔的,近期也有采用日本的不通柱孔试块。上述试块加工困难,而且角度及平底孔的加工不理想,重现性差,在使用时超声脉冲很不稳定,难以达到定量探伤的目的,给判废工作带来很大的困难。再加上我们的探伤范围极广,如要求适应范围内的一大套多而
In recent years, the method of inspecting the weld by ultrasonic is growing day by day. In order to compare the actual situation in the weld accurately and select the advanced reference block, it is very urgent to provide the appropriate detection sensitivity. At present, the shear wave sensitivity test block used in China is mostly triangular flat-bottomed holes in the Soviet Union. Recently, there has also been a Japanese non-through-hole test block. The above-mentioned test piece is difficult to process, and the processing of angle and flat-bottomed hole is not ideal, the repeatability is poor, and the ultrasonic pulse is very unstable during use, thus it is difficult to achieve the purpose of quantitative flaw detection, which brings great difficulties to the sentence-making and scrap work. Coupled with our extensive range of testing, such as requiring a large range of adaptation within the range and more