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笔者在过去十年多的时间里,受现场的委托,对车辆等构件焊接部的损伤原因,特别是转向架构架的疲劳破坏进行了调查。调查得出实际焊接部位存在焊接缺陷,特别是焊缝内的接合不良。因此,为了保证防止构件损伤,即保证焊接部的质量,就必须采用能判断接合不良程度的无损探伤方法,现有的检测方法只能够判断出缺陷的存在,而对缺陷程度的判定则非常困难。为此,我们对适用于现场的超声波探伤法进行了研究,并
In the past more than ten years, the author has been commissioned by the scene to investigate the causes of damage to welding parts of vehicles and other components, especially the fatigue damage of the bogie frame. The survey found that there are welding defects in the actual welding parts, especially in the weld joints. Therefore, in order to ensure the prevention of component damage, that is, to ensure the quality of the welded part, it is necessary to adopt a non-destructive testing method which can judge the degree of the poor bonding. The existing testing method can only determine the existence of the defect and the determination of the degree of the defect is very difficult . For this reason, we have studied the ultrasonic flaw detection method which is suitable for on-site application