NDT Methods (TOFD) for Flaw Detection during Welding

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NDT Methods (TOFD) for Flaw Detection during Welding
Posted by: Rolf Diederichs , E-mail: rd@ndt.net, on February 16, 1998 at 11:00:48:
This issue is addressed to Dr. Shaun Lawson who provided this
News topic on NDTnet 02/98.
It is written [1] :
'Defects were deliberately implanted into the testpieces by Nordon welders
at various stages of weld completion'
I wonder what types and sizes of inclusions were implanted for this trials.
From our former TOFD themes on NDTnet we know about certain POD problems
with the TOFD method.
I would appreciate if Dr. Lawson could provide more detailed information.
Rolf Diederichs

[1] http://www.ndt.net/news/1998/surrey/surrey.htm
NDT Methods for Flaw Detection during Welding.
The final ultrasonic TOFD trials of the BRITE-EURAM II project 'NDT Methods for Flaw Detection During Welding' took place in Oct 1997. The aim of the trials was to demonstrate NDT using TOFD whilst welding was taking place - i.e. the ultrasonic probes were to be placed a short distance behind the weld torch. The trials successfully demonstrated the techniques and methods developed during the four year study to undertake NDT during welding.
.......
'The trials successfully demonstrated the techniques and methods developed during the four year study to undertake NDT during welding. A number of welded test plates were prepared - one set of TIG welded 25mm thick steel, the other submerged arc welded 80 mm thick steel. Defects were deliberately implanted into the testpieces by Nordon welders at various stages of weld completion - Figure 2 shows an example of this work in progress. These defects included tungsten inclusions (for TIG welds), root cracks, porosities, lack of fusion, slag inclusions (for SA welds) and lack of penetration. The techniques that are required in order to implant suitably representative defects into the welds were developed by Nordon at an early stage in the project.'

NDT Methods for Flaw Detection during Welding

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Re: NDT Methods (TOFD) for Flaw Detection during Welding rejumohan 05:56 12/02/2002 (0)

Re: NDT Methods (TOFD) for Flaw Detection during Welding Shaun Lawson 19:15:28 2/19/98 (1)

Re: NDT Methods (TOFD) for Flaw Detection during Welding Hassan Rahimi 08:34 6/10/2000 (0)

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Comments:
: This issue is addressed to Dr. Shaun Lawson who provided this : News topic on NDTnet 02/98. : It is written [1] : : 'Defects were deliberately implanted into the testpieces by Nordon welders : at various stages of weld completion' : I wonder what types and sizes of inclusions were implanted for this trials. : From our former TOFD themes on NDTnet we know about certain POD problems : with the TOFD method. : I would appreciate if Dr. Lawson could provide more detailed information. : Rolf Diederichs : : [1] http://www.ndt.net/news/1998/surrey/surrey.htm : NDT Methods for Flaw Detection during Welding. : The final ultrasonic TOFD trials of the BRITE-EURAM II project 'NDT Methods for Flaw Detection During Welding' took place in Oct 1997. The aim of the trials was to demonstrate NDT using TOFD whilst welding was taking place - i.e. the ultrasonic probes were to be placed a short distance behind the weld torch. The trials successfully demonstrated the techniques and methods developed during the four year study to undertake NDT during welding. : ....... : 'The trials successfully demonstrated the techniques and methods developed during the four year study to undertake NDT during welding. A number of welded test plates were prepared - one set of TIG welded 25mm thick steel, the other submerged arc welded 80 mm thick steel. Defects were deliberately implanted into the testpieces by Nordon welders at various stages of weld completion - Figure 2 shows an example of this work in progress. These defects included tungsten inclusions (for TIG welds), root cracks, porosities, lack of fusion, slag inclusions (for SA welds) and lack of penetration. The techniques that are required in order to implant suitably representative defects into the welds were developed by Nordon at an early stage in the project.' :

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