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介绍了灰口铁超声波探伤的特点，论述了通过超声波成像化和手动聚焦探头对汽车刹车盘的探伤试验，并论述了对鼓风机外壳的超声波检验方法。
The characteristics of the gray iron ultrasonic flaw detection are introduced. The flaw detection of the automobile brake disc by ultrasonic imaging and manual focus probe is discussed, and the ultrasonic testing method of the blower shell is discussed.