NDT (Non-Destructive Testing) Study Guide & Complete Fundamentals Revision Notes
Borescope - ✔✔An optical device similar in principle to a telescope in that it enlarges objects
like a magnifying glass.
Fiberoptic Scope - ✔✔An optical device that has a flexible, articulated probe that can bend
around corners. Allows you to see inside objects that previously would have needed dis-
assembly.
Video Scope - ✔✔The image is recorded by a tiny light-sensitive CCD chip.
Weld - ✔✔A good ____ is uniform in width, with even ripples that taper off smoothly into the
base metal.
Liquid Penetrant Inspection - ✔✔A method of non-destructive inspection used for locating
cracks, porosity, or other types of faults open to the surface.
Green - ✔✔Using liquid penetrant inspection an ultraviolet light is used with the fluorescent
penetrant and any flaw shows up as this color.
Red - ✔✔Using liquid penetrant inspection, the colored dye method the faults show up as this
color.
Capillary Attraction - ✔✔An action causing a liquid to be drawn up into extremely tiny tubes or
between close-fitting parts.
Defect must be open to the surface - ✔✔The primary limitation of dye penetrant inspection in
that...
, Dwell Time - ✔✔The amount of time required for a penetrant to cure is called it's ____ ____
and is determined by the size and shape of the discontinuities being looked for.
Water, Emulsifying Agent, or a solvent - ✔✔Liquid penetrant is removed using either...sprayed
at a 45 degree angle.
Dry Developer - ✔✔This developer contains loose powder material such as talcum, typically
placed in a bin of loose developer.
Wet Developer - ✔✔This developer typically consists of a white powder mixed with water that
is either flowed over a surface, or a part is immersed in it.
Non Aqueous Developer - ✔✔This developer consists of a white chaulk-like powder suspended
in a solvent that is normally applied from a pressure spray can, or sprayed onto a surface with a
paint gun.
Magnetic particle inspection - ✔✔This method of NDT is useful for detecting cracks, splits,
seams and voids that form when a metal ruptures. Also useful for detecting cold shuts and
inclusions of foreign matter. (Ferrous metals)
Perpendicular to the Fault - ✔✔In order to detect a crack with magnetic particle inspection,
the part must be magnetized in such a way that the lines of flux are...
Longitudinal Magnetism - ✔✔In this time of magnetism, the magnetizing current flows either
through a coil in which the part is placed, or through a coil around a soft iron yoke.
Circular Magnetization - ✔✔In this type of magnetism, the magnetizing current flows through
a part being inspected, the lines of magnetic flux created encircle the part.
Borescope - ✔✔An optical device similar in principle to a telescope in that it enlarges objects
like a magnifying glass.
Fiberoptic Scope - ✔✔An optical device that has a flexible, articulated probe that can bend
around corners. Allows you to see inside objects that previously would have needed dis-
assembly.
Video Scope - ✔✔The image is recorded by a tiny light-sensitive CCD chip.
Weld - ✔✔A good ____ is uniform in width, with even ripples that taper off smoothly into the
base metal.
Liquid Penetrant Inspection - ✔✔A method of non-destructive inspection used for locating
cracks, porosity, or other types of faults open to the surface.
Green - ✔✔Using liquid penetrant inspection an ultraviolet light is used with the fluorescent
penetrant and any flaw shows up as this color.
Red - ✔✔Using liquid penetrant inspection, the colored dye method the faults show up as this
color.
Capillary Attraction - ✔✔An action causing a liquid to be drawn up into extremely tiny tubes or
between close-fitting parts.
Defect must be open to the surface - ✔✔The primary limitation of dye penetrant inspection in
that...
, Dwell Time - ✔✔The amount of time required for a penetrant to cure is called it's ____ ____
and is determined by the size and shape of the discontinuities being looked for.
Water, Emulsifying Agent, or a solvent - ✔✔Liquid penetrant is removed using either...sprayed
at a 45 degree angle.
Dry Developer - ✔✔This developer contains loose powder material such as talcum, typically
placed in a bin of loose developer.
Wet Developer - ✔✔This developer typically consists of a white powder mixed with water that
is either flowed over a surface, or a part is immersed in it.
Non Aqueous Developer - ✔✔This developer consists of a white chaulk-like powder suspended
in a solvent that is normally applied from a pressure spray can, or sprayed onto a surface with a
paint gun.
Magnetic particle inspection - ✔✔This method of NDT is useful for detecting cracks, splits,
seams and voids that form when a metal ruptures. Also useful for detecting cold shuts and
inclusions of foreign matter. (Ferrous metals)
Perpendicular to the Fault - ✔✔In order to detect a crack with magnetic particle inspection,
the part must be magnetized in such a way that the lines of flux are...
Longitudinal Magnetism - ✔✔In this time of magnetism, the magnetizing current flows either
through a coil in which the part is placed, or through a coil around a soft iron yoke.
Circular Magnetization - ✔✔In this type of magnetism, the magnetizing current flows through
a part being inspected, the lines of magnetic flux created encircle the part.
