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- since 1996 -
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Technical Discussions
AMIRI
Consultant, NDT/QC/WELD INSPECTION
Iran, Joined Nov 2005, 20

AMIRI

Consultant, NDT/QC/WELD INSPECTION
Iran,
Joined Nov 2005
20
06:20 Jul-02-2007
Temperature Effect on UT

Dear Friends,
What is effects of high temperature on sound velocity in matrials .for example in thickness measuring of c.steels on 500 oC what is the changing of actual thickness which detected by UT?
Regards


    
 
 Reply 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
06:41 Jul-02-2007
Re: Temperature Effect on UT
Sound velocity in all engineering materials decreases with temperature. In common steel alloys, the velocity decreases approximately 1% per 55 degrees Celcius. Thus, if you do not compensate for this change, your thickness readings at elevated temperature will be too high.

We have an application note on the subject of high temperature testing that you may find useful. Please see the link below.



    
 
 Reply 
 
chris s
Consultant, qc manager
USA, Joined Apr 2007, 9

chris s

Consultant, qc manager
USA,
Joined Apr 2007
9
08:10 Jul-02-2007
Re: Temperature Effect on UT
----------- Start Original Message -----------
: Dear Friends,
: What is effects of high temperature on sound velocity in matrials .for example in thickness measuring of c.steels on 500 oC what is the changing of actual thickness which detected by UT?
: Regards
------------ End Original Message ------------

you can elevate the temperature of your calibration block to 500oC and UT thickness readings will be accurate



    
 
 Reply 
 

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