28 terms

Dye penetrant inspection

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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?
Ferrous
Non ferrous
Non pourous plastics
On what type of material may dye penetrant inspection be used on?
Leigh sensitivity
Portable
Quick result
Low cost
What are the four advantages of dye penetrant inspection?
Must be open to the surface
Messy
Preparation
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?
50-125 temp
Parts being inspected with dye penetrant must be within what temperature range
Capillary action
Dye penetrant inspection is based on what principle
Swabbing
Spray
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
Water
Emulsifying agent
Solvent
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
Dry developer
Wet developer
Non aqueous
What are the 3 developers used
Black light
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
Green line
How are defects shown when using florescent dye
Red marks
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
Non aqueous
What type of developer is most commonly used for the field maintenance
Clean the part
Apply penetrate
Tap area lightly
Dwell time
Clean excess penetrate
Apply developer
Dwell time
Inspection
Clean the part
Complete inspection paperwork
List the sequential steps used to perform a dye penetrant inspection
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