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- since 1996 -
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Technical Discussions
gandhidasan
NDT Inspector,
StenaTech , Singapore, Joined Jun 2010, 32

gandhidasan

NDT Inspector,
StenaTech ,
Singapore,
Joined Jun 2010
32
19:05 Aug-17-2013
TOFD Query

Dear Experts,

is it mandatory for Mode converted signal in TOFD Data or it just for additional information only(not mandatory)? In this types Data acceptable by ASME Code Case?. FYI : Thickness is 109mm. Thanks in advance.

 
 Reply 
 
MAL
United Kingdom, Joined Jun 2012, 14

MAL

United Kingdom,
Joined Jun 2012
14
10:14 Aug-21-2013
Re: TOFD Query
In Reply to gandhidasan at 19:05 Aug-17-2013 (Opening).

Yes-That is the generally accepted display in most procedures for TOFD. It is possible to have a clearer respose from some defects in the mode converted form

1
 
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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
13:37 Aug-25-2013
Re: TOFD Query
In Reply to gandhidasan at 19:05 Aug-17-2013 (Opening).

Yes, particularly for reflectors far from the weld center line in wide bevels, or in many cases, defects in the base material which are hit by the transverse wave beam...

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

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1286
19:10 Aug-25-2013
Re: TOFD Query
In Reply to gandhidasan at 19:05 Aug-17-2013 (Opening).

It is indeed good practice but may not be suitable in all setups.
TOFD in ASME V Art. 4 is addressed in Mandatory Appendix III. There in para. III-471.6 you read that "...the interval from the first back-wall to the mode-converted backwall signal shall also be included in the data collected when required by the referencing Code."
For a test on 109mm wall you will probably use at least 3 TOFD zones. In this case the uppermost zone would not likely be configured to even detect a backwall and the lowermost zone could be set up to see the lower third plus the backwall and mode converted backwall signals.
Mal and Massimo give good advice in that this region of time can be used to identify flaws in the base metal. But be careful to do suitable follow-up scans to ensure that indications from the transverse mode are not simply rejected as weld defects! E.g. plate laminations are usually not rejectable weld defects and are merely to be noted in case they interfere with the pulse-echo angle beam inspection.

1
 
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