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１问题的提出与射线探伤相比，超声探伤省时、省力、成本低，所以小径管超声探伤受到人们的重视。但是到目前为止，普遍认为还存在不少难点。其中“误判”现象不可忽视，即有时探伤结果与实际解剖结果出入较大，原因究竟何在呢？仅用厚壁工件探伤的一般理论和经验去解释，...
1 PROBLEM PROBLEM Compared with ray inspection, ultrasonic inspection saves time, effort, and low cost, so the small diameter tube ultrasonic inspection receives people’s attention. However, so far, it is generally believed that there are still many difficulties. Which “misjudgment” phenomenon can not be ignored, that sometimes the results of the test and the actual results of the larger discrepancies, the reason why exactly? Only the general theory and experience of thick-walled workpiece testing to explain, ...