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 -

EKOSCAN
EKOSCAN is a French manufacturer specialized in equipment for ultrasonic Non Destructive Testing: Probes,UT boards & Scanners tailored for your needs
1604 views
Technical Discussions
Mark
Mark
12:08 Apr-20-2014
AUT Zonal discrimination.

Dear colleagues

What is the benefit of two gate for on channel in Zonal discrimination?and what kind of couplant we should use between wedge and phased array probe to make sure that is stable for long time?

    
 
 Reply 
 
Fabian Muñoz
Engineering, Integrity and NDT of Equipment Static
TP Group S.A, Colombia, Joined Apr 2011, 6

Fabian Muñoz

Engineering, Integrity and NDT of Equipment Static
TP Group S.A,
Colombia,
Joined Apr 2011
6
17:08 Apr-21-2014
Re: AUT Zonal discrimination.
In Reply to Mark at 12:08 Apr-20-2014 (Opening).

The purpose of two gates in the zonal discrimination is that the former usually works to 5% for the flight time and the second usually works 20% for amplitude, usually for inspection AUT scanners used with water as a coupling .

    
 
 Reply 
 
eginzel@mri.on.ca
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1268

eginzel@mri.on.ca

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1268
18:17 Apr-21-2014
Re: AUT Zonal discrimination.
In Reply to Fabian Muñoz at 17:08 Apr-21-2014 .

Mark, as Fabian noted, the 2 gates are time and amplitude. This simplifies analysis and also makes for a much smaller file size when constructing the strip chart (essentially 2 bytes for each gate at each sampled position along the scan path). Although water is the preferred couplant between the wedge and steel you asked about the coupling between the probe and wedge. A heavy oil or silicone grease is adequate but you should not consider ANY probe to wedge couplant as long term. The condition of the interface coupling between the probe and wedge should be checked daily...it may not need to be replaced daily but it should at least be checked daily. Generally looking at the interface through the wedge is adequate and to a large extent the coupling quality is verified by a stable calibration of the zonal targets.

    
 
 Reply 
 
Fabian Muñoz
Engineering, Integrity and NDT of Equipment Static
TP Group S.A, Colombia, Joined Apr 2011, 6

Fabian Muñoz

Engineering, Integrity and NDT of Equipment Static
TP Group S.A,
Colombia,
Joined Apr 2011
6
20:54 Apr-21-2014
Re: AUT Zonal discrimination.
In Reply to Mark at 12:08 Apr-20-2014 (Opening).

OK, the couplant between the wedge and the probe, I use the SKF grease LGWA2/0.2 Wide temperature - High load, this grease use whit the pipe wizard, i recomend you.

Edward please I recomend my post http://www.ndt.net/forum/thread.php?admin=&msgID=53186&rootID=53186#53186 Thank you.

    
 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 847

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
847
07:50 Apr-22-2014
Re: AUT Zonal discrimination.
As Ed was saying you should check your probe coupling everyday, even every shift. Regarding coupling, I tend to favor couplant like silicon grease, because coupling is better than let's say Echogel. But you should choose your coupling wisely. Some have a higher impedance than others and you will have to crank your dB up considerably.
    
 
 Reply 
 

Product Spotlight

NEOS III

NEOS III is Logos Imagings lightest DR system. With a built-in battery and internal wireless commu
...
nication, the NEOS III is perfect for users that want to quickly assess an item.
>

Ultrasonic Testing Immersion Tanks with Unmatched Scanning Features

TecScan’s non-destructive testing Ultrasonic Immersion Tanks & scanners are designed for high pe
...
rformance and demanding NDT testing applications. Our Scan3D™ line of High Precision Immersion Tanks are specifically designed for automated ultrasonic testing of complex composites parts used in aerospace and industrial applications.
>

Silverwing RMS PA - Phased-array corrosion mapping

Eddyfi Technologies integrated two market leading solutions, Silverwing’s RMS and M2M’s instru
...
ments to provide a high-speed, remote access ultrasonic phased-array inspection system with live total focusing method (TFM).
>

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