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TecScan Systems
We offer a complete line of NDT scanners, Immersion Tanks & Gantry systems which incorporate Ultrasonic, Phased Array & Eddy Current technologies.
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Technical Discussions
langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
03:05 Dec-04-2019
which one should we use
zoom image



hello! for Omniscan SX, there are 3 kinds of law configuration, angular sector, linear sector and compound sector. i found the compound sector also provides multiple angle scan, just as the angular sector. which one shall we use, for angular sector and compound sector? because, when i use the compound sector, the defect also can be found and the offset is not static. I can use offset 1, offset 2 and offset 3, they all can find the defect. so i think compound sector is more useful than angular sector. Am i right?

 
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Matthias Dreifeld
NDT Inspector, CEO
Dreifeld Materialprüftechnik, Germany, Joined Sep 2005, 101

Matthias Dreifeld

NDT Inspector, CEO
Dreifeld Materialprüftechnik,
Germany,
Joined Sep 2005
101
13:29 Dec-04-2019
Re: which one should we use
In Reply to langtuteng2 at 03:05 Dec-04-2019 (Opening).

I see your posts regularly asking trivial question, which is fine, but you really should attend a proper training course for PAUT!

To answer your question: I can't answer it. Nobody can, unless you tell people what you want to inspect. Hint: You could get this information from your test procedure ;)

1
 
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langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
16:40 Dec-04-2019
Re: which one should we use
In Reply to Matthias Dreifeld at 13:29 Dec-04-2019 .

thanks.
I attended PAUT course before, but I found my tutor couldn't answer my confusion, even though he was qualified as PCN PAUT level III. I remembered one situation: he gave us a presentation on how to character the defect, at the end of class, he said character the defect was not very accurate and sometimes, you can evaluate the defect as slag, or crack, maybe both of them are right. I also found, UT is not a very useful method to character defect. So, even though I pass the PAUT training, there is still a lot of question confused me.
compound sector and angular sector both work. when we have to prepare for PAUT procedure, we have to take into consideration which one is better. which is more efficient?

 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 218

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
218
21:06 Dec-04-2019
Re: which one should we use
In Reply to langtuteng2 at 16:40 Dec-04-2019 .

Compound sectorial is more efficient, because it combines a regular sectorial with a linear sweep. You get more bang for your buck with a compound.

In practical terms, it's useful only if you are using probes with more than 16 elements. 16 should be the minimum number of elements you use (usually, I guess... unless your circumstances are really weird and specialized). So if you have a probe like a 5L64-A12 plugged into your SX, then a compound scan is great, because you can use it to slide the exit point of the high angle beams way up to the front of the probe and really get to the root. Just use the beam plotting on the SX screen and it will show you the effect.

 
 Reply 
 

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