Non Destructive Testing (NDT) (Leaving Cert Engineering): Flashcards
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Definition of MPT
Definition of MPT
Non-destructive testing for surface defects in ferromagnetic materials
Materials testable by MPT
Materials testable by MPT
Ferromagnetic materials only
Defects detected by MPT
Defects detected by MPT
Surface and near-surface defects
Examples of ferromagnetic materials
Examples of ferromagnetic materials
Iron, steel, nickel
How defects affect magnetic field
How defects affect magnetic field
Disrupt the magnetic field pattern
Equipment creating magnetic field in MPT
Equipment creating magnetic field in MPT
Electromagnetic yoke
Particles applied in MPT
Particles applied in MPT
Iron filings or magnetic dust
Visual appearance of defects in MPT
Visual appearance of defects in MPT
Clusters or lines of iron particles
MPT use: engine blocks
MPT use: engine blocks
Check for coolant or oil leaks
MPT use: piston heads
MPT use: piston heads
Detect stress fractures
MPT advantage: speed
MPT advantage: speed
Results visible immediately
MPT advantage: sensitivity
MPT advantage: sensitivity
Detects very small surface and near-surface cracks
MPT limitation: material restriction
MPT limitation: material restriction
Only ferromagnetic materials work
MPT limitation: depth detection
MPT limitation: depth detection
Cannot detect deep internal flaws
MPT limitation: surface requirement
MPT limitation: surface requirement
Clean surfaces, free from paint, rust, or oil