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Technical Discussions
Ali Chaboki
Engineering, NDT, Welding
TUV NORD, Iran, Joined May 2013, 32

Ali Chaboki

Engineering, NDT, Welding
Joined May 2013
21:05 Aug-19-2013
Corrosion survay with TOFD

Dear specialists
I want to know is there any diference in sett up configuration of TOFD exam when inspection have to be done to look for corrosion in the region just under and in vicinity of the welds? where it should be focused in this condition?
welds are in dubble V and are on pressure vessels with various thiknesses of 20mm up to 80mm.
do offset scanning is needed?
I appreciate your response in advance.

United Kingdom, Joined Jun 2012, 14


United Kingdom,
Joined Jun 2012
10:08 Aug-21-2013
Re: Corrosion survay with TOFD
In Reply to Ali Chaboki at 21:05 Aug-19-2013 (Opening).

If you are looking for erosion or corosion on the back wall (inside surface) You should focus just above that area not at 2 \3 . This will improve your sensitivity in the area of concern. The 80mm would benefir from 2 scans offset as it has a deep wide area of concern


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