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Technical Discussions
M.C Macke
NDT Inspector
GE Inspection Services, USA, Joined Aug 2001, 8

M.C Macke

NDT Inspector
GE Inspection Services,
USA,
Joined Aug 2001
8
06:57 Mar-13-2000
Hi Temp thickness of enamle on carbon.

Without touching the piece, it is of major interest to know the
thickness of the enamle coating on cast iron. The maximum thickness
is 3mm. The key is to know this thickness at the initial
solidification temp of 1000f...if there is to little, then he can
add (t), this will help reduce the heating cycles and improve
the Quality control. This system can be assemply line driven if
proven reliable. The problems are 1000f and no contact. Emat is
out, contact required! Mag Lift off...no! UT..2 TO 3 mm at 1000f,
I don't know? Could Infrared be of some help or other optical
method? This one is giving me a hard time of it!!!!




    
 
 
M. William Moyer
M. William Moyer
07:04 Mar-13-2000
Re: Hi Temp thickness of enamle on carbon.
I saw something recently where laser ultrasonics was used to measure
wet paint thickness. Perhaps it would also work here.


: Without touching the piece, it is of major interest to know the
: thickness of the enamle coating on cast iron. The maximum thickness
: is 3mm. The key is to know this thickness at the initial
: solidification temp of 1000f...if there is to little, then he can
: add (t), this will help reduce the heating cycles and improve
: the Quality control. This system can be assemply line driven if
: proven reliable. The problems are 1000f and no contact. Emat is
: out, contact required! Mag Lift off...no! UT..2 TO 3 mm at 1000f,
: I don't know? Could Infrared be of some help or other optical
: method? This one is giving me a hard time of it!!!!




    
 
 
Rolf Diederichs
Director,
NDT.net, Germany, Joined Nov 1998, 604

Rolf Diederichs

Director,
NDT.net,
Germany,
Joined Nov 1998
604
06:47 Mar-14-2000
Re: Hi Temp thickness of enamle on carbon.
: Without touching the piece, it is of major interest to know the
: thickness of the enamle coating on cast iron. The maximum thickness
: is 3mm. The key is to know this thickness at the initial
: solidification temp of 1000f...if there is to little, then he can
: add (t), this will help reduce the heating cycles and improve
: the Quality control. This system can be assemply line driven if
: proven reliable. The problems are 1000f and no contact. Emat is
: out, contact required! Mag Lift off...no! UT..2 TO 3 mm at 1000f,
: I don't know? Could Infrared be of some help or other optical
: method? This one is giving me a hard time of it!!!!
----------------

Be carefully by measuring under such hot conditions.
You can get calibration errors of sound velocity, also
the circumferential temperature may not be equal.
There is a company 'MOOG-BUHL AUTOMATION' which supplied
ultrasonic in this field, but measured more down the line.

Rolf



    
 
 

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