GB/T 30565-2025 "Non-destructive testing—Eddy current testing—General principles" specifies the general requirements and methods for eddy current testing technology, applicable to the non-destructive testing of surface and near-surface defects in conductive materials. It clarifies the detection principle, which involves identifying defects by analyzing changes in eddy currents generated through electromagnetic induction. The standard covers technical specifications for detection equipment (such as probes and instruments), calibration requirements, and methods for selecting detection parameters (such as frequency and lift-off). It also details sample preparation, detection operation procedures, and defect evaluation criteria. This standard can be applied to the testing of components such as metal pipes, plates, and welded structures, ensuring the accuracy and consistency of detection results.