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许多汽车零部件,如制动鼓、制动盘、轴颈、转向节等关键的安全件,如果零部件表面出现细微裂纹,或者内部存有缺陷,在汽车运行长期交变应力的作用下,裂纹会从外表逐渐向内发展,或者由内向外延伸。由于表面裂纹一般十分微小,用肉眼或借助于放大镜也难于观察到,而对近表面裂纹甚至内部缺陷,则是不可能观察到的。只有这些瑕疵的零部件,在汽车使用初期并不马上就断裂,但已具有了安全隐患。因此,这些汽车零部件在生产制造过程中,必须经过一系列的无损检测,层层把关,确保完好无损,才能作为合格产品出厂。
Many automotive components, such as brake drums, brake discs, journals, knuckles and other key safety parts, if there are minor cracks on the surface of the parts, or internal defects in the car under the action of long-term alternating stress, Cracks gradually inward from the exterior, or from the inside out. Because surface cracks are generally very small, with the naked eye or with a magnifying glass is difficult to observe, and near-surface cracks or even internal defects, it is not possible to observe. Only the defective parts, the early use of the car does not immediately break, but it has a security risk. Therefore, these auto parts in the manufacturing process, must go through a series of non-destructive testing, check each other to ensure that intact, as qualified products shipped.