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NDT

Nondestructive Testing

QuestionAnswer
What is used to check parts and structures to determine their suitability without affecting the component serviceability? Nondestructive Testing NDT or Nondestructive Inspection NDI
Used to find defects that are open to the surface. Dye Penetrant
What type of materials can dye penetrant be used on? Ferrous and non-ferrous metal, non-porous plastic
Name two types of penetrant. Visible Dye and Fluorescent Dye
Which type of dye only takes a small quantity to provide a highly visible indication of flaws? Fluorescent Dye
Penetrant materials are classified as: Water-soluble and Post-emulsifying
Amount of time required for the penetrant to cure (drain)is known as... Dwell time (or penetrant time)
Smaller the defects... Longer the dwell time
What is the best method for cleaning a surface for dye penetrant? Volatile petroleum base solvent
What acts as a blotter to draw the penetrant out of surface discontinuity and produce a visible indication? Developer
What can be used to inspect parts for external and internal defects on metals, plastics, composites and ceramics? Ultrasonic Inspection
Another name for the tap test is... Metallic ring test (coin test)
What is used to detect delamination and debonding in aircraft structures? Tap test (coin test, ring test)
Used to detect cracks, pitting, discontinuities and corrosion in metals both on the surface and subsurface. Eddy Current Inspection
Requies little or no part preparation before use... Eddy Current
A well trained specialist is required for this test. Radiographic Inspection (X-Ray)
Detects flaws both surface and just below surface on ferrous materials like: steel, iron, nickel, cobalt, and their alloys. Magnetic Particle Inspection
What are the two methods used to magnetized metals are? Continuous and Residual
Provides greater sensitivity than the residual procedures particularly in locating subsurface defects... Continuous
A part is magnetized and the indicating medium is applied after the magnetized and then inspected at a later time... Risidual
Allowing a part or a group of parts to be magnetized and then inspected at a later time. Risidual
In magnetic particle inspection the testing medium that is generally used is? High permeability and low retentivity
The ease with which a part can be magnetized. Permeability
Refers to a metal's tendency to keep a magnetic field after the magnetizing current is removed. Retentivity
What must be done to parts, that have a magnetic particle inspection, before installing the part into the aircraft? Demagnetization
The effective way for demagnetizations is to slowly remove the part... from the AC magnetic field of sufficient strength
How do you demagnetize a part that was magnetized by the DC method? Reverse DC current
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