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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
mark
mark
10:03 May-11-2013
TOFD stainless steel

Dear Colleagues

what kind of TOFD probes we should choose to inspect stainless steel with 5mm thickness?

 
 Reply 
 
Mal Hill
United Kingdom, Joined Jun 2012, 14

Mal Hill

United Kingdom,
Joined Jun 2012
14
10:36 May-11-2013
Re: TOFD stainless steel
In Reply to mark at 10:03 May-11-2013 (Opening).

The application is very limited.You would be advised to scan from both sides, but this often isn't possible in service.You also need to focus at the back wall to have any chance of a reasonable scope of detection.If you are looking for internal corrosion you may get done sort of result but m is usually the limit and even at 7mm body exam is limited and the top surface non existent.Probes can be purchased at 75 degree 15 MHz and also 70 degree with a snub nose or shorter emission point for thin pipe so you can achieve a better PCS.If you are looking for stress corrosion cracks you should back up with other methods .If there appear to break the surface DP is fine .We verified scrubber column cracking with TOFD and DP though they were 50 mm thick so s lot easier to achieve a meaningful result.Play around on a 5 mm test piece with a notch or 2 till the timings are correct with regard to your material velocity.

 
 Reply 
 
massimo carminati
Consultant, AUT specialist
IMG Ultrasuoni Srl, Italy, Joined Apr 2007, 691

massimo carminati

Consultant, AUT specialist
IMG Ultrasuoni Srl,
Italy,
Joined Apr 2007
691
22:32 May-12-2013
Re: TOFD stainless steel
In Reply to mark at 10:03 May-11-2013 (Opening).

For me there are 2 major mistakes; one is TOFD on stainless (austenitic) welds, second is to perform TOFD on 5 mm.

 
 Reply 
 

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