抱轴瓦是内燃机车的重要部件,其白合金与瓦背粘合质量的优劣对行车安全有很大影响。但长期以来采用肉眼观察,敲击听声音,或压平试验等检查方法,不仅准确性差,而且也存在经济性差,主观性大等缺点。为此,我们改用超声波检查法。轴瓦结构抱轴瓦的结构示图如图1,是一种铜背的巴氏合金(83~#白合金)瓦。瓦背由锡青铜浇注而成,在瓦背加 The axle bearing is an important part of the diesel locomotive. The quality of its white alloy and tile back bonding has great influence on driving safety. However, for a long time, such methods as naked eye observation, percussion sound listening, flattening test and the like have not only bad accuracy, but also have the disadvantages of poor economy and subjectivity. To this end, we use ultrasound. Bearing structure of the axle bearing structure shown in Figure 1, is a copper back of Babbitt (83 ~ # white metal) tile. The back of the tile is made of tin bronze, added at the back of the tile