Missed edge detected on final visual inspection BEFORE AUT - how to proceed iaw DNV-OS-F101

What's a "missed edge"?

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In this specific case and my general parlance, where the capping run adjacent to the parent material has left a small (circa 10mm long) unfilled zone with the weld bevel. Instead of an even geometry pass, at this one point the bead narrows and doesn't even reach the bevel. Hope this explains - maybe lack of fill?

If you really are an NDE guy, it will pay you to get familiar with the proper terminology. Perhaps you mean some kind of "Undercut". Undercuts can be dangerous for lack of stress carrying capacity, high stress concentrations and acceleration of corrosion. They must be repaired.

Now see this.

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A picture may be worth a thousand words in this case.

Good luck,
Latexman

Technically, the glass is always full - 1/2 air and 1/2 water.

On this diagram (of a compound weld) there is a clear difference between what I term missed edge (LFS cap) and undercut (U/c Cap). I am an NDE guy but not a welding engineer but I believe the former has a different cause than the latter, and I would really appreciate if someone can give a very brief explanation of their causes. No parent material thinning has taken place with missed edge whereas there is definite thinning with undercut.

Also I wondered is anybody knew the Code evaluation and sentencing to DNV-OS-F101-10 but also out of interest to other codes. On this project im on which is auto-mig welded I saw the final weld station inspector call a welder over to profile by grinding and TiG repair the missed edge without it being called a repair. As stated this happened in the capping weld station so before NDT (AUT).

Thanks for your advice.

The idea is that the welder produces a quality weld on his own, not to depend on the inspector to produce quality. The inspector guarantees quality. Therefore it is a weld error that was repaired. Weld error box needs a check. Repair box needs a check. Inspector needs re-education.

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NDEGUY-

Thank you for your contributions to these forums. In a previous post (Magnetic Particle Indications thread330-153580 ) you referenced a pdf you were able to get through BINDT titled Magnetic particle inspection of precipitation hardening type steels written by C R Preston. It was originally published December of 2002 as Vol. 44 No. 12.

I am having a difficult time with possible false indications in 17-4 stainless steel, and I am hoping this article could assist with our testing.

You had indicated you could forward the article. Do you know the article I am referring to? If so, are you able to forward a copy?

Thank you for your assistance, Sir.

Scott

Hi Scott

" ...able to get through BINDT titled Magnetic particle inspection of precipitation hardening type steels written by C R Preston. It was originally published December of 2002 in Vol. 44 No. 12 of Insight."

Where are you based? Have you tried to obtain a copy from BINDT, Northampton UK? IIts their copyright, so they are the first to approach as you have the details of the article, its author and which issue it appeared in.

Good luck

ndeguy