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- since 1996 -
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Technical Discussions
Ronnie
NDT Inspector,
United Kingdom, Joined Oct 2013, 2

Ronnie

NDT Inspector,
United Kingdom,
Joined Oct 2013
2
17:00 Oct-12-2013
Single Crystal Probes

Wondering if anyone can help out!

Which probe (single/double) would be used for thickness checks up to 50mm and why??

I'd really appreciate any input on this as I'm at a loss as to find out! There are obvious merits of twin crystal capacity alleviating dead zone etc.. However I'm not up on single at all so not sure.

Many thanks.

    
 
 Reply 
 
Gaouas Abderrahmane
NDT Inspector, - sgs
sgs, Algeria, Joined Jun 2010, 8

Gaouas Abderrahmane

NDT Inspector, - sgs
sgs,
Algeria,
Joined Jun 2010
8
16:31 Oct-13-2013
Re: Single Crystal Probes
In Reply to Ronnie at 17:00 Oct-12-2013 (Opening).

There are many probe types that are made for specific customer requirements. Please aske OLYMPUS and send your drawing or sketch of your application, and they will quote a special probe to fit your part.
Cheers

    
 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
21:18 Oct-13-2013
Re: Single Crystal Probes
In Reply to Ronnie at 17:00 Oct-12-2013 (Opening).

Ronnie

Up to 50mm can be either single or twin. Twin has no dead zone so is traditionally used for thin wall (<10mm) materials. As with all probes check machine calibration with the desired probe in the expected range you will be working.

For thicker materials use a single crystal.

    
 
 Reply 
 
andrew cunningham
NDT Inspector
Canada, Joined Jun 2008, 238

andrew cunningham

NDT Inspector
Canada,
Joined Jun 2008
238
21:34 Oct-14-2013
Re: Single Crystal Probes
In Reply to Ronnie at 17:00 Oct-12-2013 (Opening).

A single is the most accurate. The sound pulse and echo is a straight line, whereas the twin pulse echo is a V. The thinner the wall the broader the V, but the smaller the diameter the tighter the V.
So don’t use a twin unless necessary

All the best

    
 
 Reply 
 
Ronnie
NDT Inspector,
United Kingdom, Joined Oct 2013, 2

Ronnie

NDT Inspector,
United Kingdom,
Joined Oct 2013
2
20:08 Oct-16-2013
Re: Single Crystal Probes
In Reply to andrew cunningham at 21:34 Oct-14-2013 .

Hi guys!

Wondering if you could cast your expertise on this!!

On Double Vee welds what would be the best probe to use??

I'm aware that in many instances you'd look at material thickness in conjunction with probe selection. However, is there a specific probe for this kind of weld or material thickness always the necessary starting point?? I.e less that 12.5mm thickness 70 fir the root, 60 for the body and 45 for the cap and toes!!

Many thanks guys!

    
 
 Reply 
 
Csaba Hollo
,
Retired, Canada, Joined Feb 2010, 301

Csaba Hollo

,
Retired,
Canada,
Joined Feb 2010
301
20:25 Oct-16-2013
Re: Single Crystal Probes
In Reply to Ronnie at 20:08 Oct-16-2013 .

There are code specific requirements that drive what angle transducer you use.

Perhaps you ask this question in your own thread instead of hijacking this one.

    
 
 Reply 
 

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