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Singapore, Joined Jan 2012, 123


Joined Jan 2012
07:37 Apr-09-2020
AWS D1.1 TABLE 8.2
zoom image

Hi Expert,

Indication Rating "d" and length shall use for accept/reject. Length fine for me and indication rating "d" not sure how to apply. How should apply obtained dB indication rating value in the attached table? what actually the row Class A to Class D +5, +2, -1, 0 all this representing. How should I read this table. Please advice. Thanks.


Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 888

Michel Couture

NDT Inspector,
Joined Sep 2006
13:50 Apr-10-2020
Re: AWS D1.1 TABLE 8.2
In Reply to Peter at 07:37 Apr-09-2020 (Opening).


Class A to D are simply indication severity. What you are missing from your table are the notes below the table that explain the meaning of each class.

For exemple, for a steel thickness between 8-20mm, any indication greater than +8 dB will be classified as a Class D and shall be disregard.

A Class C indication which is +8 dB, Note 5) state: Only those discontinuities exceeding 50mm(2in) in length and having a more serious rating(smallernumber) than this level shall be rejected.

I guess you can figure it out for Class A and B. Remember you still have to apply the directives in notes 1) to 4) to complete your assessment.


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