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 -

TecScan Systems
We offer a complete line of NDT scanners, Immersion Tanks & Gantry systems which incorporate Ultrasonic, Phased Array & Eddy Current technologies.
826 views
Technical Discussions
SK AHAMMED ALI
SK AHAMMED ALI
09:43 Oct-14-2014
Atenuation Factor

The “Attenuation Factor C on the test report shall be attained by subtracting1 in.
[25 mm] from the sound-path distance and multiplying the remainder by 2. This factor shall be roundedout to the nearest dB value. Fractional values less than1/2 dB shall be reduced to the lower dB level and thoseof 1/2 dB or greater increased to the higher level.


Can anybody explain this?

 
 Reply 
 
Jon Wallis
NDT Inspector, -
Netherlands, Joined Feb 2010, 626

Jon Wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
07:24 Oct-15-2014
Re: Atenuation Factor
In Reply to SK AHAMMED ALI at 09:43 Oct-14-2014 (Opening).

Attenuation is 'absorption' of your sound in a particular material. Some materials attenuate more than others. Think of a light beam in clear dark air (fine grain low alloy carbon steel) and compare this with the same light beam in fog (course grain high alloy carbon steel).
When using the DGS system, you need to compensate for attenuation and specific materials have an attenuation factor that needs to accounted for when UT testing. This is because echo comparison is between a flat bottom hole in fine grain low alloy material (clear air) and your workpiece (unknown). This problem doesn't present itself with side drilled hole based comparisons as the comparison block should be made from the same material as the workpiece.

 
 Reply 
 
GOWRISANTHOSH PALIKA
NDT Inspector,
Royscan engineering pte ltd, Singapore, Joined May 2008, 52

GOWRISANTHOSH PALIKA

NDT Inspector,
Royscan engineering pte ltd,
Singapore,
Joined May 2008
52
09:33 Oct-16-2014
Re: Atenuation Factor
In Reply to SK AHAMMED ALI at 09:43 Oct-14-2014 (Opening).

hi
for every inch of sound travelling through the steel, there will be a loss of 2dB. It is correct when you use equipment that all stated in AWS D1.1.

 
 Reply 
 

Product Spotlight

ISONIC 3510

Very Powerful Superior Performance Extremely Portable Smart Phased Array Ultrasonic Flaw Detector an
...
d Recorder with 2 Conventional UT and TOFD Channels uniquely combines PA, single- and multi-channel conventional UT, and TOFD modalities providing 100% raw data recording and imaging. Suitable for all kinds of every-day ultrasonic inspections
>

EKOSCAN Phased Array

In order to always fit your needs, EKOSCAN can manufacture any type of UT transducer, either convent
...
ional or Phased Array. As an ISO 9001: 2015 certified company, EKOSCAN is extremely careful as far a material selection and manufacturing processes are concerned. Our probes guarantee our customers the benefits of latest innovations regarding piezo-composite, backing, impedance adaptation layer, etc. Specific probes for hostile environment: high temperature, high pressure, corrosive environment,etc. Specific probes designed to fit your specific application: optimization of every parameter to guarantee you the best detection.
>

IRIS 9000Plus - Introducing the next generation of heat exchanger inspection.

Representing the seventh generation of the IRIS system, the IRIS 9000 Plus has nearly 200 years of c
...
ombined field inspection experience incorporated in its design. This experience combined with a strong commitment to quality and a history of innovation has made Iris Inspection Services® the undisputed leader in IRIS technology.
>

NDTkit RT

NDTkit RT, TESTIA's Digital Radiography software The NDTkit product line software for X-ray analysi
...
s. NDTkit RT is a software benefiting from the Ultis kernel which is dedicated to radiographic image analysis. It offers a set of tools and filtering processes to assist RT operators in finding relevant flaws.
>

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