Fluorescent penetrant inspection is generally used for non-porous materials and parts such as non-magnetic materials, aluminum alloys, stainless steel impellers, blades and the like, including processing defects and defects generated in use, and is suitable for testing items such as aviation, aerospace and automobile parts. The design and manufacture must meet the requirements of HB/Z61-98, EN571, GJB2367A-2003 and other process specifications.