The undetected or misjudge problem of on testing by ultrasonic waves of welding seam is a very conspicuous problem.

• 焊缝超声检测的漏检或误判问题是一个比较突出的问题,其中一个重要原因是由反射波信号确定缺陷大小、形状和性质时存在较大偏差。