Dye penetrant inspection
Cracks, porosity, only open to surface
Liquid dye pentrant is used to detect what type of discrepencies?
Defect must be open to the surface
What is the main limitation of the dye penetrant method of inspection?
Non pourous plastics
On what type of material may dye penetrant inspection be used on?
What are the four advantages of dye penetrant inspection?
Must be open to the surface
List three disadvantages of dye penetrant inspection
Free of grease, oil , and dirt
What sort of materials must be removed from the surface before applying dye
Chrome or anodized
What type of surface coating need not be removed when during dye penetrant
Using vapor degreasing or scrubbing with a solvent
What is the most effective method of cleaning the surface before applying the dye?
Blasting, scrapping, or heavy brushing should not be used because they close discontinuities
What type of cleaning methods should not be used? Why?
Parts being inspected with dye penetrant must be within what temperature range
Dye penetrant inspection is based on what principle
Immersing the part in liquid
What three methods may be used to apply dye penetrant
Fluorescent and colored
What two types of dyes are used in dye penetrant inspection
The amount of time it takes the penetrate to cure
What is meant by dwell time
Size and shape of the discontinuities your looking for
What factors determine how long the penetrant is kept on the part being inspected
3 methods used to remove excess penetrant from the surface of the part being inspected
Draw penetrant from faults
What is the purpose/function of the developer
What are the 3 developers used
When using florescent penetrant, what additional equipment is necessary to reveal defects.
Fluorescent penetrant inspection
What is another term used for zyglo inspection
Surface being dirty, hot parts and dirty parts
Wha should be avoided when applying penetrant
How are defects shown when using florescent dye
How do faults show up when using colored dye penetrant
Wasn't throughly washed
What would cause a crack indication to be fuzzy instead of sharp and clear after the developer was applied?
Control the amount of penetrant that is removed prior to cleaning
What is the purpose of the remover emulsifier
Rinse with solvent
Once the inspection has been completed how is the nonaqueous developer removed
What type of developer is most commonly used for the field maintenance
Clean the part
Tap area lightly
Clean excess penetrate
Clean the part
Complete inspection paperwork
List the sequential steps used to perform a dye penetrant inspection
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