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Technical Discussions
Peter
Singapore, Joined Jan 2012, 122

Peter

Singapore,
Joined Jan 2012
122
02:58 Nov-09-2019
PAUT-NO THRESHOLDING



Dear Expert,

Attached image from ASME V. Can someone explain what they mean by "No Thresholding". As per my understanding we shall set the gate to cover halfskip and fullskip at required gate level which is most of time 20%. For this requirement we shall not set any gate at area of interest? Please advice. Thanks.

Peter.

 
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Levi Porter
R & D,
Dacon Inspection Technologies, Thailand, Joined Jan 2017, 48

Levi Porter

R & D,
Dacon Inspection Technologies,
Thailand,
Joined Jan 2017
48
12:22 Nov-09-2019
Re: PAUT-NO THRESHOLDING
In Reply to Peter at 02:58 Nov-09-2019 (Opening).

Hi Peter,
I could be mistaken, but I believe this may refer to what modern digital UT flaw detectors often call "Reject". Where signals below the reject threshold are not shown on live A-Scan presentations or recorded in ultrasonic data.

The core of V-471.6 seams to indicate that all data should be saved and at a digitization rate that will provide enough data to preserve signal quality within a certain dB drop.

Hope that help!
-Levi

 
 Reply 
 
suresh
suresh
14:46 Nov-11-2019
Re: PAUT-NO THRESHOLDING
In Reply to Peter at 02:58 Nov-09-2019 (Opening).

Dear,

Threshold as mentioned in this para belongs to Image based technique, here there is no consideration of amplitude of the discontinuity. U can see just below the para , they mentioned the size of the image to be evaluated, where in the amplitude based technique most of the standard refers that all signal crossing over 20% shall be evaluated.

 
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