对汽轮转子第八级叶片处变径的应力槽进行超声波探伤。为能发现短小应力裂纹 ,利用缺陷波的声程与圆弧波、拐角波的声程相同 ,从而引起波幅叠加 ,使圆弧波和损角波波幅升高的方法 ,在理论上进行了必要的探讨 ,在实践中进行了摸索 ,认为该方法操作简便 ,切实可行 Ultrasonic flaw detection was performed on the diameter-reduced stress groove at the level-8 blade of the steam turbine rotor. In order to find the short-stress cracks, the method of using the sound path and the arc of the defect wave and the sound waves of the corner wave to be the same, which causes the superposition of the amplitude and the increase of the amplitude of the arc of the arc and the amplitude of the impaired wave, is theoretically necessary In practice, it explores that this method is simple, practical and feasible