PT II Lesson 5 Flashcards
(28 cards)
Selection depends on several factors such as:
Customer requirements
Specification requirements
Engineering design requirements
Sensitivity requirements
Size and number of test objects
Surface conditions of test objects
Configuration of the test objects
Cost of equipment and materials
Availability of water, electricity, compressed air, and suitable testing area
What are the advantages of Type 1 penetrant?
Easier to see indications
What are the disadvantages of type 1 penetrant?
Need a dark room and special lighting
What are the advantages of type 2 penetrant
No special lighting required
What are the disadvantages of type 2 penetrant
Less sensitive indications
Advantages of type 3 penetrations?
Flexible impimentation
Disadvantages of type 3 penetrants?
Less contrast than type 1 and 2
Advantages of method A penetrant
Fast
inexpensive
chemically safer
can be portable
can be used for larger castings, forgings, or small machined objects
does not need an emulsifier and requires less steps
Disadvantages of Method A penetrant
Risk of over washing
Less sensitive than other methods
Advantages of method B penetrant
One of the most sensitive methods
Less danger of over washing
Can reprocess the test item in the emulsifier
Disadvantages of method B penetrant
More control process checks
Have to time emulsification time
more expensive
more steps, slower
Not allowed by some industry specifications
Advantages of method C penetrant
Portable
Little set up
No process control checks like other methods
No power supply or running water is needed if it’s a type II
Disadvantages of method C penetrant
Wiping method makes the process slower
not as sensitive as the other types
difficult to use on larger surfaces
Advantages of method D penetrant
Most sensitive
Less danger of over washing
The use of sprayers for water and emulsifier can make this method faster
Disadvantages of method D penetrant
Costly
Extra steps with emulsifier
More process control checks
Form A developer advantages
Good for rough surfaces
easy to handle and transport
Does not leave film when removed, thus no special cleaning required
Inexpensive
can be applied by blowing, immersion, pouring, fog chamber, or spraying
Form A developer disadvantages
Test object must be completely dry
over drying can reduce sensitivity bruh
least sensitive and shouldn’t be used with visible penetrant
May need respirators
Form B developer advantages
May be applied by dipping, spraying, or flowing
test object can be wet or dry when applying the developer
No need for agitation
particles easy to remove in post-cleaning
Form B developer disadvantages
Indications can be blurred if not dried quickly
Requires daily maintenance checks
Typically not used with water washable or visible penetrants
Form C developer advantages
Can be applied by immersion, spraying, or flowing
Test object can be wet or dry when applying developer
Developer particles are very absorptive when dried
Form C developer disadvantages
Produces runs and streaks
requires frequent agitation or stirring
Requires daily maintenance checks when used in tanks
Form D and E developer advantages
Most sensitive developers
portable in aerosol cans, thus minimal risk of contamination
Thickness and area easily controlled by operator
Dries easily
Form D and E developer disadvantages
Only applied to test surface with spray gun or aerosol can
Test object must be completely dry
Needs constant agitation
Cans yield small spray area and coverage, thus large surfaces would be hard to cover bruh
Form F developer advantages
Used in extreme environment conditions that other developers can’t be used in
Some special developers create permanent indications to provide permanent record of indications
