Assessment of wall thickness

Example:

Wall reduction in aluminium

D) Procedure

1. Put the probe on a spot with original thickness of BK2 and balance the system!

2. Shift the point and the grid downwards to get more space for the signals!

3. Adjust the lift-off signal!

4. Guide the probe over the smallest wall and set the gain for a signal of app. 80 % of the screen height!

5. Record the signal of all wall reductions!

6. Repeat the steps 1 to 5 for 2 different  frequencies!

 

A) Job

1. Optimise the frequency for wall reduction assessment!

2. Optimise the signal indication!

 

B) Utensils

1. EddyCation BK2

2. Absolute probe

 

C) Restriction

1. Adjust the frequency so that even the thickest remaining wall produces a sufficient signal!

E) Report

1. 3 EddyCation reports with all signals.

2. What inspection frequency do you suggest and why?

3. Discuss the opportunities and limits of eddy current wall assessment!

Remaining wall

0.8 mm

 

2.0 mm

 

1.2 mm

 

1.6 mm

 

Lift-off

f = 3.6 kHz

 

Eddy current inspection with EddyCation

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