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zakk
zakk
14:07 Jul-27-2011
UT by AWS D1.1 2010

I make UT by AWS D1.1 2010
At Reference Level ( b )
in code make by get maximum reflection from 1.59 mm hole of IIW BLOCK
1.How much Percent Scale Hight ?
Because if know Percent Scale Hight Set
after can see dB ( It is Reference Level ( b ) or not ?

 
 Reply 
 
Tyler
NDT Inspector,
GE Inspection Technologies , USA, Joined May 2011, 24

Tyler

NDT Inspector,
GE Inspection Technologies ,
USA,
Joined May 2011
24
17:11 Jul-27-2011
Re: UT by AWS D1.1 2010
In Reply to zakk at 14:07 Jul-27-2011 (Opening).

The zero reference level sensitivity used for discontinuity evaluation shall be attained by adjusting the calibrated gain control (attenuator) of the discontinuity detector, meeting the requirements of 6.22, so that a maximized horizontal trace deflection (adjusted to horizontal reference line height with calibrated gain control [attenuator]) results on the display, in conformance with 6.29.2.4.

6.29.2.4 Amplitude or Sensitivity Calibration Procedure. The transducer shall be set in position A on the IIW block (any angle). The maximized signal shall then be adjusted from the 0.060 in. [1.59 mm] hole to attain a horizontal reference-line height indication (see Annex X, X2.4 for alternative method). The "MAXIMUM" decibel reading obtained shall be used as the “Reference Level, "b” reading on the Test Report sheet in conformance with 6.23.1.

 
 Reply 
 
George Butcher
George Butcher
01:18 Jul-29-2011
Re: UT by AWS D1.1 2010
In Reply to zakk at 14:07 Jul-27-2011 (Opening).

For D1.1, you should be OK with setting the reference to 80% of full screen height, at whatever db is required to reach the screen percent. So, if you are using a 70 degree, and you need 62 db to achieve 80%, the 62 db is your reference level and is 'b' on the report form. You evaluate flaw ratings against this 62 db.

 
 Reply 
 
Shahid bangash
Engineering,
Saudi Arabia, Joined Feb 2009, 136

Shahid bangash

Engineering,
Saudi Arabia,
Joined Feb 2009
136
08:20 Jul-29-2011
Re: UT by AWS D1.1 2010
In Reply to zakk at 14:07 Jul-27-2011 (Opening).

Set reference level b at 50% of FSH.

 
 Reply 
 
Ian R Stephenson
Ian R Stephenson
09:25 Aug-02-2011
Re: UT by AWS D1.1 2010
In Reply to Shahid bangash at 08:20 Jul-29-2011 .

Where on earth do you get 50% from ?, go with 80%...

 
 Reply 
 
amir sajjad
NDT Inspector, Saudi Specialized Laboratories Co. (NDTEL) Motabaqah
Saudi Specialized Laboratories Co. MOTABAQAH, Saudi Arabia, Joined Mar 2011, 21

amir sajjad

NDT Inspector, Saudi Specialized Laboratories Co. (NDTEL) Motabaqah
Saudi Specialized Laboratories Co. MOTABAQAH,
Saudi Arabia,
Joined Mar 2011
21
11:19 Aug-02-2011
Re: UT by AWS D1.1 2010
In Reply to Ian R Stephenson at 09:25 Aug-02-2011 .

if u are following AWS D1.1 the db for reference level b should be 40% to 60%.
this is what mentioned there in 6.25.5.2.
however normally the practice is to get 80%

 
 Reply 
 
shahid bangash
Engineering,
Saudi Arabia, Joined Feb 2009, 136

shahid bangash

Engineering,
Saudi Arabia,
Joined Feb 2009
136
07:11 Aug-03-2011
Re: UT by AWS D1.1 2010
In Reply to Ian R Stephenson at 09:25 Aug-02-2011 .

Ian R Stephenson-NDT Inspector!!!
it is nonsense to take ASME references for other cases also.

According AWS D1.1, 2010- Clause 6.25.5.2 zero reference level (b) SHALL be attained between 40% and 60 % screen height.
Moreover USM -35XS manual also elaborates this point on page 5-29 stating a and b to be set at 50% (+/-5) of FSH.

Regards

 
 Reply 
 
GOWRISANTHOSH
NDT Inspector,
Royscan engineering pte ltd, Singapore, Joined May 2008, 52

GOWRISANTHOSH

NDT Inspector,
Royscan engineering pte ltd,
Singapore,
Joined May 2008
52
10:15 Aug-03-2011
Re: UT by AWS D1.1 2010
In Reply to shahid bangash at 07:11 Aug-03-2011 .

hi
yes i agree with Mr.shahid bangash. it is clearly mentioned in latest AWS D1.1-2010
6.25.5.2 zero reference level i.e, "b" shall be attained by adjusting maximised echo between 40% to 60% screen height.
regards
Gowrisanthosh Paika

 
 Reply 
 

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