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我厂于1983年5月大检修期间,对冷却水循环泵轴仅进行表面探伤,未发现缺陷。重新开车后,不到20天该泵轴破断,导致全装置停车,经济损失达四十余万元。事故分析结果认为,是由于原残存在轴中的缺陷而引起的。通过这次严重的教训,如何对φ60mm以下的轴类进行超声探伤提到了重要的议事日程。轴类的锻造采用轴向拔长工艺,缺陷基本上与轴线方向平行,所以,主要应采用直探头在圆弧面上探伤。但由于小轴的半径小、曲率大,如采用普通的直探头直接接触探测,则耦合状况不良,且一次声程处
I plant in May 1983 overhaul, the cooling water circulation pump shaft surface inspection only, found no defects. After re-driving, less than 20 days the pump shaft broken, resulting in the entire device parking, economic loss of more than 40 million. The result of the accident analysis is that it is due to the original residual defects in the shaft. Through this serious lesson, how to carry out ultrasonic flaw detection on shafts up to 60mm in diameter refers to an important agenda. Axial forging using axial drawing process, the defect is basically parallel with the axis direction, therefore, the main probe should be straight on the arc surface flaw detection. However, due to small radius of the small axis, the curvature, such as the use of ordinary straight probe direct contact detection, the coupling is not good, and a sound path