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Technical Discussions
saroj
NDT Inspector,
KNDT UAE TECHNO INSPECTION LLC, Nepal, Joined Apr 2019, 6

saroj

NDT Inspector,
KNDT UAE TECHNO INSPECTION LLC,
Nepal,
Joined Apr 2019
6
09:38 May-14-2019
depth location tolerance

when i calibrate for weld scan usually i have been calibrating velocity, wedge delay and sensitivity . after that i create the TCG. everything goes normally but when i check the depth of well known side drilled hole it shows lesser than actual. but there is not big difference. when i check 25mm depth hole it shows 22 mm. is it acceptable? if not how i can manage that? please anyone do help me. thanks.

    
 
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Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 746

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
746
16:34 May-14-2019
Re: depth location tolerance
In Reply to saroj at 09:38 May-14-2019 (Opening).

should be within +/- 1 mm

    
 
 Reply 
 
NOUFEL.T.MUHAMMED
NOUFEL.T.MUHAMMED
19:21 May-15-2019
Re: depth location tolerance
In Reply to saroj at 09:38 May-14-2019 (Opening).

I think if your wedge delay calibration is ok,then depth should show correctly.
when checking the depth by taking an indication from a reflector you should position your angle cursor in S scan at the centre of the indication and thickness of the block should be given.

    
 
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Edward Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1268

Edward Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1268
21:47 May-15-2019
Re: depth location tolerance
In Reply to saroj at 09:38 May-14-2019 (Opening).

Noufel points out a good concern with the wedge delay. In addition to that I might mention that the reading you get on the display is based on the maximum amplitude position. This will be at the outer edge of the Side Drilled Hole and you usually state the depth of the hole based on its centre. As a result, the signal from the outer surface will be less than the nominal depth which is based on the centre.
Another factor is the beam dimension. If the hole is in the near field you may find that the maximum pressure is at back of the beam and not on the beam nominal centreline. This too may cause a slightly lower reading than the nominal hole depth.

1    
 
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Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 746

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
746
23:59 May-16-2019
Re: depth location tolerance
In Reply to saroj at 09:38 May-14-2019 (Opening).

You must have set your tolerance as +/- 3 mm when making the wedge delay. Set to +/- 2 mm and redo wedge delay

    
 
 Reply 
 

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