where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

Matec Instrument Companies, Inc.
Ultrasonic test instrumentation and systems for quality control inspection and production testing applications and scientific research.
230 views
Technical Discussions
Jagath
India, Joined May 2018, 4

Jagath

India,
Joined May 2018
4
16:41 Jan-21-2020
UT thickness correction on high temperature surfaces

hello friends, please explain the thickness correction on high temperature surfaces ,and give me the example for carbon steel. (I found some answers in Google but I'm not clear about that answers)

 
 Reply 
 
Pradeep Boddu
NDT Inspector,
K-KEM , India, Joined Feb 2016, 32

Pradeep Boddu

NDT Inspector,
K-KEM ,
India,
Joined Feb 2016
32
18:26 Jan-21-2020
Re: UT thickness correction on high temperature surfaces
In Reply to Jagath at 16:41 Jan-21-2020 (Opening).

Jagath,

A rule of thumb is as follows:

The apparent thickness reading obtained from steel walls having elevated temperatures is high by a factor of about 1% per 55°C.
If the instrument was standardized on a piece of similar material at 20°C, and if the reading was obtained with a surface temperature of 460°C, the apparent reading should be reduced by 8%.

Thank You.

 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 227

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
227
20:54 Jan-22-2020
Re: UT thickness correction on high temperature surfaces
In Reply to Pradeep Boddu at 18:26 Jan-21-2020 .

Pradeep,

A correction... as you correctly state, the velocity of carbon steel decreases approximately 1% for every 55 deg C. This slower velocity means longer transit time, which would fool the machine into thinking the test piece is getting thicker, not thinner. Once the velocity setting was lowered to the correct value, the resulting thickness reading will be reduced to the correct value.

Cheers,
Paul

 
 Reply 
 

Product Spotlight

Sci Aps Z-Series Portable Handheld Analysers

The world’s only handheld analyzer that measures carbon content in stainless (yes even L-grades),s
...
teels, and cast irons. Also accepted for low Si analysis for sulfidic corrosion analysis, and is widely used in the power industry for Cr analysis, for flow accelerated corrosion applications.
>

Wireless TOFD scanner

Quick, accurate and highly reproducible welds testing. The System operates wirelessly and is compat
...
ible with any type of Windows based Laptop, Desktop or Tablet.
>

High-end Ultrasonic Flaw Detector with 32:128PR PAUT and 2-ch TOFD: SyncScan 2

SIUI’s newly launched SyncScan 2, is a high-end ultrasonic flaw detector with 32:128PR PAUT and
...
2-ch TOFD, which can maximize your efficiency for PA and TOFD. ● Support PA/TOFD/UT ● 32-ch PA is more suitable for inspection on extra-thick wall and high-attenuation material. ● 32-ch PA and 2-ch TOFD work simultaneously. ● Support PR mode for corrosion inspection.
>

Semi-Automated Phased Array Immersion System for Small Composite Parts

Turn-key semi-automated system as an improved and affordable solution for inspection of small comp
...
osite parts. Includes support table, immersion tank, scanner, PA instrument, PC, Analysis software, database, wedge management and other options.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window