Which set of non-destructive testing methods is commonly used for turbine blades and disks?

• A. Ultrasonic Testing, Dye Penetrant, Magnetic Particle Inspection, Radiography
• B. Penetrant Testing, Magnetic Particle Inspection, Eddy Current, Radiography
• C. Radiography, Ultrasonic Testing, Magnetic Particle Inspection, Dye Penetrant
• D. Eddy Current, Ultrasonic Testing, Dye Penetrant, Radiography

Answer: (B)

Non-destructive testing of turbine blades and disks aims to detect surface cracks, near-surface flaws, and internal defects without destroying the parts. The combination of Penetrant Testing, Magnetic Particle Inspection, Eddy Current, and Radiography provides broad coverage across these defect types and material conditions. Dye penetrant testing is simple and effective for revealing surface-breaking cracks on a wide range of materials. Magnetic Particle Inspection is ideal for ferromagnetic components, exposing surface and near-surface cracks quickly by concentrating magnetic leakage at flaws. Eddy Current testing uses electromagnetic induction to detect near-surface cracks and corrosion and works well on complex geometries like blade roots and disks. Radiography images the interior of a component, identifying voids, inclusions, and internal cracks that surface methods can miss. Together, these methods cover surface, near-surface, and internal indications commonly found in turbine blades and disks, making this set a practical and widely used combination.