Definition of 'flaw' and 'defect'
Definition of 'flaw' and 'defect'
(OP)
Hi all!
I would like to track down a definitive reference which states the difference between a flaw and a defect in the English language. I believe this originated in AWS somewhere.
Can anybody help?
Thanks
I would like to track down a definitive reference which states the difference between a flaw and a defect in the English language. I believe this originated in AWS somewhere.
Can anybody help?
Thanks





RE: Definition of 'flaw' and 'defect'
For base metals, Codes and Standards bodies view defects, flaws and now let me introduce imperfections as synonymous terms, and are used interchangeably.
ASME B31.1 has a specific section titled, Definitions. There is one for flaw and one for defect.
RE: Definition of 'flaw' and 'defect'
While all defects are flaws, not all flaws are defects.
RE: Definition of 'flaw' and 'defect'
= = = = = = = = = = = = = = = = = = = =
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RE: Definition of 'flaw' and 'defect'
An "Indication" is what the specific NDT method reveals (be it an accumulation of particles, a 'blip' on the UT screen, or bleed-through with penetrant testing). The inspector first determines whether it is relevant (caused by a flaw or imperfection in the material) or irrelevant (an artifact created by the method, such as the build-up of particles on a sharp edge with Mag. Particle). If it is relevant, he then determines whether it is a defect (and, therefore rejectable), or acceptable, based on the accpetance criteria. Depending on the inspection requirements, accpetable indications may have to be recorded, but aren't cause for rejection.
rp