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Liquid Penetrant > The Process (1) > Flashcards

The Process (1) Flashcards

1
Q

Six steps in LPI

A
  • preparation
  • penetrant
  • removal
  • development
  • inspect
  • post clean
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2
Q

Preparation

A
  • remove all obstructions
  • must not harm the test part
  • do not leave residue that will affect the outcome of examination
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3
Q

Penetrant

A
  • application
  • time critical
  • appropriate type and method for relevant defects
  • must not harm the part
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4
Q

Methods of applying penetrant: (4)

A
  • dipping
  • spraying (electrostatic spray guns)
  • brushing
  • flowing
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5
Q

Define Dwell Time

A

amount of time the penetrant is required to be in contact with the inspection surface

  • penetrant must remain liquid
  • immersion dwell time = soak time + drain time
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6
Q

Removal

A
  • excess penetrant is removed without removing penetrant in discontinuities
  • water or solvent
  • must not be harmful to part
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7
Q

Removal methods (4)

A

A - water wash (emulsifiers in suspension)
B - Post emulsifiable, Lipophilic (oil base)
C - Solvent removal
D - Post emulsifiable, Hydrophilic (water base)

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8
Q

Removal method A

A
  • water wash
  • emulsifiers in suspension
  • best method of removal is with a coarse water spray
  • risk of “over-washing”
  • fluorescent, visible, dual
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9
Q

What does “post emulsified” mean?

A
  • removal method B & D
  • emulsifiers are added after dwell time to make penetrant water washable
  • fluorescent or visible
  • time to work = emulsification time
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10
Q

Removal method B

A
  • post emulsifiable

- oil based

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11
Q

Removal Method D

A
  • post emulsifiable
  • water based
  • needs a mechanical scrub action (water spray)
  • longer emulsification time than method B
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12
Q

Removal method C

A
  • solvent dampened cloth to wipe
  • cloth is lint free
  • fluorescent, visible, dual
  • has classifications
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13
Q

Solvent removal classes

A

1 - halogenated
2 - non-halogenated
3 - special application

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14
Q

Develop

A
  • “bleeds out” penetrant
  • fine powder absorbs dye
  • provides contrast
  • develops or enhances the “see ability”
  • blots dye to bring trapped penetrant to the surface
  • spreads dye
  • requires development time
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15
Q

4 forms of developers

A

A - dry powder
B - water soluble
C - water suspendible
D - wet non-aqueous

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16
Q

Inspect

A
  • lighting (1000uW/cm2 black light, 1000 lux visible, 15in distance)
  • finding indications
  • understanding defects
  • interpret and evaluate
17
Q

Post Clean

A
  • neglecting can be harmful to part
  • failure to remove will cause future contamination
  • remove all remnant chemicals

Liquid Penetrant (11 decks)

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