Perform NDI Inspections. Flashcards
Explain the procedure to use when making a dye penetrant inspection of a part?
Clean the part thoroughly, apply the penetrant, and allow it to soak for the recommended dwell time. Remove all of the penetrant from the surface and apply the developer.
Why is it important that all parts be thoroughly cleaned before they are inspected by the dye penetrant method?
Any grease or dirt in a fault will keep the penetrant from seeping into the fault.
Explain the procedure to use when performing a magnetic particle inspection of a part.
Thoroughly clean the part, magnetize it as directed by the appropriate service manual, flow the indicating medium over the surface, and inspect it under a black light. When the inspection is complete, thoroughly demagnetize the part.
Why is it necessary to magnetize a part both circularly and longitudinal when inspecting a steel part by magnetic particle method?
To detect faults that extend across as well as lengthwise within the part.
Does circural magnetization detect faults that are across or lengthwise to the part?
Lengthwise.
Why is it important that all engine parts which have been inspected by the magnetic particle method be completely demagnetized?
If the parts are not completely demagnetized, they will attract steel particles that are produced by engine wear and will cause damage to bearing surfaces.
What is the principle if eddy current inspection?
A current is included into the metal being tested by a test probe. The amount of induced current is determined by the conductivity, mass, and permeability of the material, and the presence of any faults or voids.
