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Technical Discussions
langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
02:42 Dec-04-2019
the confusion on Omniscan SX
zoom image



hello! recently, i found there was a R view when I analysis the PAUT data, just as the image I uploaded. but sometimes, I found the indication shown on the R view was not correct, the reflector was not on the position as shown on R view. so it made me confused. could any one know the reason? was it because this is just a welding model and the cap was not taken into consideration?
thanks

1
 
 Reply 
 
Matthias Dreifeld
NDT Inspector, CEO
Dreifeld Materialprüftechnik, Germany, Joined Sep 2005, 101

Matthias Dreifeld

NDT Inspector, CEO
Dreifeld Materialprüftechnik,
Germany,
Joined Sep 2005
101
13:30 Dec-04-2019
Re: the confusion on Omniscan SX
In Reply to langtuteng2 at 02:42 Dec-04-2019 (Opening).

See the picture (Stolen from Ed Ginzel) attached.

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

Matthias Dreifeld

NDT Inspector, CEO
Dreifeld Materialprüftechnik,
Germany,
Joined Sep 2005
101
13:31 Dec-04-2019
Re: the confusion on Omniscan SX
In Reply to Matthias Dreifeld at 13:30 Dec-04-2019 .

zoom image



there it is^^
1
 
 Reply 
 
langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
16:26 Dec-04-2019
Re: the confusion on Omniscan SX
In Reply to Matthias Dreifeld at 13:31 Dec-04-2019 .

thanks! here you are right. but how do we know whether the indication is caused by waveform transformation or not? we don't know when it will produce a waveform transformation.

 
 Reply 
 
Naser
Iran, Joined Nov 2018, 4

Naser

Iran,
Joined Nov 2018
4
16:30 Dec-04-2019
Re: the confusion on Omniscan SX
In Reply to langtuteng2 at 02:42 Dec-04-2019 (Opening).

Hi
I think the axial index parameter is not set correctly.
If you put the correct axial index on the piece, you will see the indications will transfer to weld profile (on S scan view). Also you are getting the root and Cap indications in this picture.

 
 Reply 
 
langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
16:47 Dec-04-2019
Re: the confusion on Omniscan SX
In Reply to Naser at 16:30 Dec-04-2019 .

thanks! the offset parameter was set correctly. and we can verify it according the root LOP, the most red indication on the image.
I can send the original data to you, pls leave your email.

 
 Reply 
 
Naser
Iran, Joined Nov 2018, 4

Naser

Iran,
Joined Nov 2018
4
16:59 Dec-04-2019
Re: the confusion on Omniscan SX
In Reply to langtuteng2 at 16:47 Dec-04-2019 .

Naser.jafari.84@gmail.com

 
 Reply 
 
Carlos Andrés Galán
NDT Inspector,
UIS - Universidad Industrial de Santander, Colombia, Joined Oct 2014, 32

Carlos Andrés Galán

NDT Inspector,
UIS - Universidad Industrial de Santander,
Colombia,
Joined Oct 2014
32
22:42 Dec-04-2019
Re: the confusion on Omniscan SX
In Reply to langtuteng2 at 02:42 Dec-04-2019 (Opening).

Hi,
You must verify the index offset and the location of the front of the shoe with respect to the center line of the weld, and you must verify the location of the bezel on the screen, some mxu programs let it move and sometimes without intension it is moved.

Is the scan doing it semi-automatically with encoder or with scanner?

 
 Reply 
 
langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
02:24 Dec-05-2019
Re: the confusion on Omniscan SX
In Reply to Carlos Andrés Galán at 22:42 Dec-04-2019 .

thanks. the offset index is right. when I set up the focal law, I took notes the offset index. before I start scanning, a pencil was used to draw a line on the component and the distance between the welding axis and this line is the offset index. my probe shoe was moved along this line. So I can make sure the offset is right.

 
 Reply 
 
Carlos A. Galán
NDT Inspector,
UIS - Universidad Industrial de Santander, Colombia, Joined Oct 2014, 32

Carlos A. Galán

NDT Inspector,
UIS - Universidad Industrial de Santander,
Colombia,
Joined Oct 2014
32
14:30 Dec-05-2019
Re: the confusion on Omniscan SX
In Reply to langtuteng2 at 02:24 Dec-05-2019 .

the other indications that are seen along the scan axis for that same scan angle in the C-scan are seen in the same position. Or is it only that which is located 100 mm in the scan axis that is misplaced?

 
 Reply 
 
langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
06:33 Dec-06-2019
Re: the confusion on Omniscan SX
In Reply to Carlos A. Galán at 14:30 Dec-05-2019 .

I can send the original data to you, pls leave your email.

 
 Reply 
 
langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
06:46 Dec-06-2019
Re: the confusion on Omniscan SX
In Reply to Carlos A. Galán at 14:30 Dec-05-2019 .

hello! they haven't been misplaced. most of the indications alone the scan axis on the C scan map appeared the same position. though, I have known they are caused by welding cap, but on the other situation, I can't make sure whether they are caused by cap. Is there any experience I can follow? thanks

1
 
 Reply 
 
Ahmed Afifi
Ahmed Afifi
07:11 Dec-06-2019
Re: the confusion on Omniscan SX
In Reply to langtuteng2 at 02:42 Dec-04-2019 (Opening).

I would ask to see if they can ground flush the weld cap or at least a small area.

 
 Reply 
 
langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
07:23 Dec-06-2019
Re: the confusion on Omniscan SX
In Reply to Ahmed Afifi at 07:11 Dec-06-2019 .

thanks. maybe we can ground the cap, but mostly, we evaluate the data in office or welder can't agree with ground the cap.

 
 Reply 
 
Carlos Andrés Galán
NDT Inspector,
UIS - Universidad Industrial de Santander, Colombia, Joined Oct 2014, 32

Carlos Andrés Galán

NDT Inspector,
UIS - Universidad Industrial de Santander,
Colombia,
Joined Oct 2014
32
02:57 Dec-09-2019
Re: the confusion on Omniscan SX
In Reply to langtuteng2 at 06:46 Dec-06-2019 .

hi,

based on the shared image, the indication does not correspond to a geometric echo of the crown or reinforcement of the weld.

 
 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
12:07 Dec-09-2019
Re: the confusion on Omniscan SX
In Reply to langtuteng2 at 02:42 Dec-04-2019 (Opening).

zoom image



I can't say for 100% certainty, but it does look an awful lot like a stray mode converted echo. Here is a similar one from an old scan of mine. I know this is not a real weld flaw because this was done on a purchased UT test specimen.

Notice the beam goes right through the root area... that's the hint right there. If you have a beam that goes through the root area, then you can only consider reflections "at the root" to be relevant, because there is no reflection possible to see anything in the 2nd leg.
 
 Reply 
 
langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
16:36 Dec-09-2019
Re: the confusion on Omniscan SX
In Reply to langtuteng2 at 02:42 Dec-04-2019 (Opening).

here is the website you can download the original data:
https://pan.baidu.com/s/19nRWWcpnVgsRgckOtOVinw
when you link this website, a box will appear where you have to input the access code.
access code is : 45id

 
 Reply 
 

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