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介绍在单面焊双面成形的大直径厚壁管焊缝超声波探伤中，采用K2探头作为主探探头，辅以K1探头扫查时仪器的校准、距离──波幅曲线的制作。
Introduction In the ultrasonic flaw detection of large-diameter thick-walled pipe welds with single-sided welding, the K2 probe is used as the main probe and the K1 probe is used for calibration of the instrument. The distance-amplitude curve is produced.