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1·This paper studied the feasibility of determining and comparing the thermal shock construction damage of refractory by ultrasonic flaw detector.

探讨了利用超声波探伤仪测定或比较耐火材料热震结构损伤的可行性。

2·The defects in the cold rolling roll detected by ultrasonic flaw detector are mainly the cracking defects, the non-metallic inclusions plays an important role for producing the cracking defects.

冷轧辊坯超声波探伤超标的主要原因是裂纹性缺陷，非金属夹杂物对裂纹性缺陷的产生起到了重要的作用。

3·The principle of detector is that the A-Scan flaw instrument of USL32 beams the ultrasonic to detect the bar material with the method of pulse echo once.

该系统采用A型超声波探伤仪产生超声波脉冲，采用一次脉冲反射法检测棒材。