Lift-off

Slot depth in mm

1.5

 

1.0

 

2.0

 

Underlying in mm

 

f = 3.4 kHz, logarithmic indication

0.5

1.0

 

1.5

 

C) Procedure for surface cracks

1. Use BK1 with slots turned up!

2. Put the probe on a slot-free spot and balance the system!

3. Turn the lift-off signal horizontally to the left (use the lift-off automatics)!

4. Record the slot signals in one image best filling the XY-plane.

5. Optimise the frequency according to best crack depth discrimination!

 

A) Job

Optimise the setting for crack detection and evaluation!

 

B) Utensils

1. EddyCation BK1

2. Absolute probe

 

 

F) Report

1. 3 EddyCation reports with all signals.

2. What frequency do you suggest for what job and why do you suggest it?

3. According to what signal parameters you may evaluate surface cracks?

4. According to what signal parameters you may evaluate hidden cracks?

5. How an insulation coating affects the results?

6. Discuss the opportunities and limits of eddy current crack detection and evaluation using an absolute probe!

Crack detection with absolute probe

Example: Open and hidden slots in aluminium

D) Procedure for hidden cracks

1. Use BK1 with slots turned down!

2. - 4. see C)

5. Optimise the frequency according to best discrimination of the crack underlying!

 

 

E) Procedure both crack types

1. Activate the logarithmic indication!

2. Turn the slots of BK1 down!

3. Put the probe on a slot-free spot and balance the system!

4. Lift-off adjustment to the left!

5. Move the probe over the most underlying slot and open the gain until clearly recognising the slot signal!

6. Record the signal of all open and hidden slots!

 

Eddy current inspection with EddyCation

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Wall thickness

 

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