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YXLON Copenhagen
YXLON Copenhagen is a highly specialized, award winning Danish company with 60 years of experience in portable X-ray solutions for industrial NDT.
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Technical Discussions
langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
07:18 Dec-06-2019
a beautiful PAUT s scanning image
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zoom image



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hello!recently, I used PAUT to inspect the bolt. the equipment and other information are:
PAUT equipment is Omniscan SX (16:64 PR),
probe is 5L64A32,
size of bolt is M42×305,
material is 304ss,
focal law is 0 degree sector scanning, -30°---30°.
the image is shown as enclosure
the question are:
1. why are there so many non-relevant indications? are they caused by high PRF, I don't think they are caused by high PRF, because I set the acq. rate is optimized.
2. could we use the PAUT to inspection the bolt? when I inspect several artificial defect (10 bolts), I found if the length of inspection zone is shorter than 100mm, PAUT is useful. or it doesn't work very well. does anybody agree with me?

 
 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
10:15 Dec-06-2019
Re: a beautiful PAUT s scanning image
In Reply to langtuteng2 at 07:18 Dec-06-2019 (Opening).




I dont have much experience in testing bolts, but I do a lot of forged bars.
PAUT works great for your inspection, but your shaft is too long for this setup. You have to to more probe positions

Keep in mind the additional echos that you get from narrow cylindrical objects (at, correct me if Im wrong, 1,7) and you get wave conversion from grazing incidence.
 
 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
10:21 Dec-06-2019
Re: a beautiful PAUT s scanning image
In Reply to Matthias Dreifeld at 10:15 Dec-06-2019 .

Sorry, its 0,76, not 1,7.

 
 Reply 
 
Daniel Braun
Daniel Braun
13:58 Dec-06-2019
Re: a beautiful PAUT s scanning image
In Reply to langtuteng2 at 07:18 Dec-06-2019 (Opening).

you tried a very generic solution that may work of course but there are mode dedicated and precise solution, refer for example to:

https://youtu.be/t6fFcbw18z4

or to:

http://www.sonotronndt.com/Movies2/BoltInspection.mp4

more data may be found here

http://www.sonotronndt.com/SHAFTS_BOLTS.htm

http://www.sonotronndt.com/APPLICATIONS/PA_APPS/PA_APP_STORE/ISONIC_PA_EXPERT_SHAFT.pdf

It seems you're from China (@163.com) - in your country some users prefer using of so called daisy array probes - see for example the video here:
https://youtu.be/ak2iK_O-teg

or here:

http://www.sonotronndt.com/Movies3/TRAINING_MOVIES/ISONIC_2009/BOLT_INSPECTION_DAISY_ARRAY.mp4

The solution based on the use of daisy array probe may be implemented in regular B-Scan (liner scan) mode, also we saw some Chimes manufacturers fold the B-Scan image into 3D to produce more impression on their customers

1
 
 Reply 
 
Edward Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1286

Edward Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1286
15:15 Dec-06-2019
Re: a beautiful PAUT s scanning image
In Reply to Matthias Dreifeld at 10:21 Dec-06-2019 .







Matthias is correct in that you require more probe positions for correct volume coverage. In 2007-2008 Eclipse Scientific made a dedicated phased-array bolt scanner. It consisted of a probe holder equipped with an encoder and held different PA probes. Different sized holders were used for different sized probes. The bolt was scanned by rotating the probe on the cap and collecting S-scans that were merged and analysed (see paper by Michael Moles at https://www.ndt.net/article/jrc-nde2007/papers/29_08-14.pdf)
To help understand what was happening I made a glass simulated model of a bolt with corrosion (it has a smooth arc cut into it). I used this to make a photoelastic image that I subsequently overlaid on the S-scan of the same glass model...see attached photos
2
 
 Reply 
 

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