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Teletest
Teletest Focus+ was the first system to use long-range guided wave ultrasonic testing to detect corrosion in pipelines.
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Technical Discussions
Jan Verkooijen
Jan Verkooijen
06:02 Jan-25-1999
Ultrasonic Inspection of Welds in Duplex Steel

The inspection of Duplex steels is challenging.
We have had very good experiences on partially filled welds
in Duplex pipelines using Time Of Flight Diffraction,
where the results were validated against radiography and
destructive testing. Here TOFD was found to have found
all relevant defects as well as being able to size defects.
The same inspection on fully welded specimens proved more
problematic towards the top of the weld, but was still
satisfactory for the purpose. We also have very good results
in high strength steels with a duplex filler material weld.
On duplex forgings however (flanges, nozzles, T-pieces),
TOFD is not possible due to
the large grain sizes. Here we apply mechanised
Pulse Echo meanderscanning techniques and/or PE linescanning.
For nozzles it becomes more involved, because detailed
modelling is necessary before applying ultrasonic techniques,
and to evaluate the results.
For this we have developed software such as CGTOFD (for TOFD)
and MUSE for PE inspections. I will gladly send some more
information to your post address.

Jan Verkooijen



    
 
 Reply 
 
Queency Brown
Queency Brown
02:33 Jun-02-2000
Re: Ultrasonic Inspection of Welds in Duplex Steel
: The inspection of Duplex steels is challenging.
: We have had very good experiences on partially filled welds
: in Duplex pipelines using Time Of Flight Diffraction,
: where the results were validated against radiography and
: destructive testing. Here TOFD was found to have found
: all relevant defects as well as being able to size defects.
: The same inspection on fully welded specimens proved more
: problematic towards the top of the weld, but was still
: satisfactory for the purpose. We also have very good results
: in high strength steels with a duplex filler material weld.
: On duplex forgings however (flanges, nozzles, T-pieces),
: TOFD is not possible due to
: the large grain sizes. Here we apply mechanised
: Pulse Echo meanderscanning techniques and/or PE linescanning.
: For nozzles it becomes more involved, because detailed
: modelling is necessary before applying ultrasonic techniques,
: and to evaluate the results.
: For this we have developed software such as CGTOFD (for TOFD)
: and MUSE for PE inspections. I will gladly send some more
: information to your post address.

: Jan Verkooijen




    
 
 Reply 
 
shaun platts
shaun platts
04:46 Jan-17-2007
Re: Ultrasonic Inspection of Welds in Duplex Steel
please could you give me sum information regarding ultrasonics with pulse-echo shear wave form and the restrictions/complications if thers is any on duplex/super duplex


    
 
 Reply 
 

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