Eddy Current Inspection Flashcards
Advantages of eddy current inspection
a) fast
b) may be automated
c) no harm to part
d) no post-cleaning
e) equipment is light and portable
f) sensitive to small surface cracks
g) wide range of application
Disadvantages of eddy current inspections
a) applicable only to metal
b) electrical and magnetic interference may cause
problems with interpretation
c) highly trained personnel are required
d) affected by numerous variables causing difficulty in
interpretation
Basics of Eddy Current Generation
a) Current flow
b) The magnetic field and induced current flow
c) Current flow induced by wire coil
d) Eddy currents
The movement of electric charge, (electrons) is called
current flow
An electric field drives
free electrons
what have many free electrons (conductor)
metals
What have no free electrons (nonconductor)
insulator
Within a wire,________?with the atoms making up the conductor. The collisions slow them down and cause _____?
electron collide, energy loss through heat
These collisions also limit current flow, which is referred to as
resistivity
A_______?resistivity material loses large amounts of energy to heat
high
A_______?resistivity material produces little heat
low
Is the opposite of resistivity
conductivity
High resistivity has
low conductivity (aluminum)
Low resistivity has
high conductivity (mild steel)
When a traveling electron has a force act upon it in a sideways manner, this is defined as a
magnetic field
