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RADIOGRAPHIC TESTING (NDT TEST) (BENEFITS (Minimum surface preparation…
RADIOGRAPHIC TESTING (NDT TEST)
INTRODUCTION
Use X-ray or gamma rayys to examine internal structure of manufactured component identifying any flaws or defect
Gamma radiation - Product off radioactive atom
The radiation are of higher energy (shorter wave length) version of the electromagnetic wave
X-ray and gamma ray can characterized by frequency wave - Length and Velocity
BENEFITS
Minimum surface preparation required
Provide permanent record of inspection
Can Inspect assembled component
Isolate and inspect internal component
Very internal flaws on complex structures
DISADVANTAGE
Harmful radiation
Expensive consumeable
Slow result
Very little indication of depths
TECHNIQUE RADIOGRAPHY
Single wall Single Image (SWSI) Panoramic
Film outside, source inside (internal exposure)
Single Wall Single Image (SWSI)
Film inside, source outside
Double Wall Single Image (DWSI)
Film outside, source outside (external exposure)
Double Wall Double Image (DWDI)
Film outside, source outside (Elliptical exposure)
TYPE OF RADIOGRAPHY
Computed Radiography
Real Time Radiography
Film or Paper Radiography
Neutron Radiography
Stereo Radiography
DEFECT INSPECTION IN RADIOGRAPHIC
Crack
Inclusion
Shrinkage