Penetrant and eddy current testing of tail pipe component of aircraft auxiliary power unit

Taking a certain type of auxiliary power unit (APU) tail pipe assembly as the research object, according to its material, structure and working environment, considering the inspection cost and operability, penetrant testing and eddy current testing are selected for its inspection. The two detection methods are compared in terms of working environment, work preparation, and process flow. The test results show that both detection methods can detect the typical crack defects of the tail tube assembly.