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NDT
Nondestructive Testing
Question | Answer |
---|---|
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 |