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8/12/2019 Uv Light Inspection for Ndt
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UV LIGHT INSPECTION FOR NDT CRACK DETECTION
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E quipment Required
Ultraviolet Black Light (365nm wavelength) (100 fc at 15 inches)
Fluorescent Iron Particles
Burma Castrol Strips
Magnetizing Coil
Magnetic Field Indicator
Spray Can
Rags
Centrifuge Tube
Centrifuge Tube Stand
Dark Room
Water
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Demagnetization
A longitudinal magnetic field has magnetic lines of force that run parallel to the long axis of the part.
A circular magnetic field has magnetic lines of force that run circumferentially around the perimeter of a part.
Interpretation of indications
After applying the magnetic field, indications that form must interpreted.This process requires that the inspector
distinguish between relevant and non-relevant indications.
Demagnetization
Parts inspected by the magnetic particle method may sometimes have an objectionable residual magnetic field that may interfere with subsequent manufacturing operations or service of the
component.
Possible reasons for demagnetization include:
May interfere with welding and/or machining operations
Can effect gauges that are sensitive to magnetic fields if placed in close proximity.
Abrasive particles may adhere to components surface and cause and increase in wear to engines components, gears, bearings etc.
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Limitations of
Magnetic Particle Inspection
Cannot inspect non-ferrous materials such as aluminum, magnesium or most stainless steels.
Inspection of large parts may require use of equipment with special power requirements.
Some parts may require removal of coating or plating to achieve desired inspection sensitivity.
Limited subsurface discontinuity detection capabilities. Maximum depth sensitivity is approximately 0.6 (under ideal conditions).
Post cleaning, and post demagnetization is often necessary.
Alignment between magnetic flux and defect is important
PPE Required
Gloves
Ultraviolet Safety Glasses
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Dimensions
Steel Rule
OD Caliper
ID Caliper
Tally Tape
Depth Gauge
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Ultrasonic Wall Thickness Measurement
UT Meter
Coupling
Reference
Gauges
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Visual Welding Inspection
Welding imperfection:
UNDERCUT
POROSITY
INCOMPLETE FUSION
OVERLAP
UNDERFILL
SPATTEREXCESSIVE CONVEXITY
EXCESSIVE CONCAVITY
EXCESSIVE WELD REINFORCEMENT
INCOMPLETE PENETRATION
EXCESSIVE PENETRATION
UNACCEPTABLE
WELD PROFILES
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Visual Thread Inspection
Tool Joints Imperfection
Black Crested Threads
Chattered Threads
Cracks
Cuts
DentsEccentricity
False Starting Threads
Feather Edge
Fin on Threads Crest
Galled ThreadsPitted Threads
Rusted Threads
Threads Profile Out
Interrupted Starting Threads
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