在电厂,需探伤的圆筒形重要部件是很多的,如汽、水管道、联箱,汽包、除氧器和加热器等。对这些工件进行周向超声波探伤时,缺陷的定位需用余弦公式进行一系列运算,相当繁琐,费时费力,工效很低。目前在现场探伤时,很少这样计算。有的是做一些与被探工件相似尺寸的模拟试块进行校对;有的把其视作平面工件进行近似计算。这些方法虽较简便,但增加了探伤的准备工作量,常会造 In the power plant, to be flawed cylindrical important components are many, such as steam, water pipes, headers, drums, deaerators and heaters. The circumferential ultrasonic flaw detection of these parts, the positioning of the defect requires a cosine formula for a series of operations, quite cumbersome, time-consuming and labor-intensive, low efficiency. Currently in the field flaw detection, rarely calculated in this way. Some do some proofing similar to the size of the workpiece being probed proofreading; some of them as planar workpiece approximate calculation. Although these methods are simple, but increased the amount of preparation for testing, often made