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I had two of those too... On one, it was so close to the edge I just cut in from the side with a hot cut, then treated it the same way I did a delamination. The other was right smack in the...

That has definitely been the assumption I have been working with! :)

When I was folding and stacking, I tended to let it cool down anyway so I could grind the scale off and clean up the surfaces a...

I had the same problem while upsetting. Most of the time peeling the layers further apart, cleaning them, fluxing and re-welding did the trick and then it was fine. From your experience, I wonder if...