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EDDY CURRENT TESTING - Coggle Diagram
EDDY CURRENT TESTING
a method that use the principal of "electromagnetism" as the basis for conducting examinations
Eddy Current Theory : Testing
frequency is the most important that affect the Eddy Current
Factors Affecting Eddy Current Response
electrical conductivity of the test material
material permeability of the test material
frequency
geometry
proximity/lift-off
depth of penetration
eddy current is strongest at the surface of the material and lower strength below the surface
sensitivity eddy current depend on the eddy current density
standard of depth penetration : 37%
Measurement of eddy current
material thickness
crack detection
Basic step to perform inspection with surface probe
select and setup the instrument & probe
select frequency
adjust the instrument to obtain recognizable defect response using calibration standard
place the probe which is coil on the component surface
scan the probe over the surface in a pattern which provide a complex coverage of the area we are inspected (orientation)
monitor the signal
Procedure inspection
material identification
material sorting
determination of heat damage
cladding and plating thickness measurement
heat treatment monitoring
Conductivity measurement
Eddy current is use to measure the electrical conductivity at the Bell bronze casing
Equipment
instrumentation - meter
analog
digital
probes
reference standard
Advantages & Limitations