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Lamination in structural steel

Lamination in structural steel

Lamination in structural steel

Can any one tell me if lamination in steel columns can be repaired?

We had las year a case where about 30% of the material for a project had a few less than 1 mm deepth laminations. There was a lot of discusion and it was decided that they could not be repaired, my personal opinion was that it could be done but a lot of heads ahd the final desition.

Any one had this experience? do AISC allow the reparation of this imperfection?


RE: Lamination in structural steel

That appears as Crack, now the entire ru may have
Internal defects. So now can't be trusted.
Return to the supplier for waranty.

RE: Lamination in structural steel

We done ultrasound and dye penetrant and they didnĀ“t go all the way the thickness, let me show another picture


RE: Lamination in structural steel

Do you mean ultrasonic inspect. ?
Penetrant is only surface defects.
If it's ultrasonic inspect a ruff surface would be difficult to test.

RE: Lamination in structural steel

Sure, anything can be repaired.

But if cost and risk are considered then repair isn't always the best choice.

Seems like that's what the lot of heads figured out.

RE: Lamination in structural steel

The first photo of the flaw is not a lamination; however, it is a rolling flaw which could be repaired. Whether it needs to be is another matter. Futher exploration of the second flaw is needed for evaluation. Could be a seam and may not be deep. Try grinding a portion to determine depth.

RE: Lamination in structural steel

1. We returned the hole lot
2. Yes ultrasound inspect
3. That was a year ago and my opinion was to repair but the rest of the team did not agree and this delayed the project for more than a month
4. Sorry grinding is not possible any more
5. The factory supervisor came to the project and measured the deepth with and instrument that has a needle and not one had up to one milimeter

Thank you all for your opinions, for me repairing was cheaper than changing the material


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