WELD JOINTS - PERCENTAGE NDT, NDT LOT &
PENALTY JOINT SELECTION.
(A review based on weld joints in process piping. )
PART - 3
Discontinuity and Defect.
There will be discontinuities in the weld joints. A defect is an unacceptable discontinuity.
In the example which we have discussed, if the 10% lot sample contained only a discontinuity and not a defect, the situation is further alarming. The discontinuity may be a defect on the 20% line, which the welder welded, with the damped electrode.
So each discontinuity observed should be properly analysed and reason for the discontinuity to be recorded.
Discontinuity investigation and further NDT.
In view of the questions raised, it is clear that some acceptable action plans are needed in the percentage NDT of weld joints.
Each discontinuity observed in the percentage NDT of weld joints are to be analysed and suggestive steps of action to be taken.
This analysis to be done at the time of radiography film interpretation (along with other site analysis/ physical analysis of the situation, if needed) and recorded on the radiography film interpretation report. The further required NDT to be mentioned on the report along with the joint/ the welder/the wps/the area/the line /or other combination , of which further NDT to be done.
This discontinuity analysis will give a confidence that the discontinuity issues are addressed properly.
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