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Technical Discussions
Dayton
Dayton
07:32 Oct-29-2019
UT Thickness Approaches

Hello everyone, hoping to get some clarity about a few issues when
Doing a UT Thickness inspection:

#1) For High Temperature Items with manual UT:
A) Use a UT Temperature Correction formula
B) Heat up the Cal Block on the test item

I ask because trying to heat up the block doesnt seem to
reach the same temp as the specimen.

And #2 Surveying Ut thickness on a 1" thick CS material
with SS overlay..
Asked to find thickness of both the CS and the overlay
Started out showing good backwall with no noticeable reflections,Then I start to find High amplitude reflections midscreenRange.. should I suspect flaws/disbonding or could it be the interface?
(Calibrated to a CS step wedge.
Havent been able to get a block with reference flaws or weld overlay)



 
 Reply 
 
ashok kumar patra
,
Saudi K-KEM Engineering service co, Saudi Arabia, Joined May 2018, 55

ashok kumar patra

,
Saudi K-KEM Engineering service co,
Saudi Arabia,
Joined May 2018
55
10:08 Oct-29-2019
Re: UT Thickness Approaches
In Reply to Dayton at 07:32 Oct-29-2019 (Opening).

Please follow SE797. calibrate the UT machine at room temperature for each rise of 55 degree from room temperature 1% should be minus from the thickness you got after measuring the thickness at high temperature.

You should have to use high temp couplant and probe.

For overlay you may use Signus 6 + machine, may be you get the thickness.

 
 Reply 
 

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