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简述了在线整体无损探伤要实现的目标；详细介绍了超声探伤的方法和步骤；提示了具有疲劳裂纹工件的残余寿命的评估公式和方法。
The aim of the on-line non-destructive flaw detection is described briefly. The methods and steps of the ultrasonic flaw detection are introduced in detail. The evaluation formulas and methods for the residual life of the workpiece with fatigue crack are presented.