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Sorry to have taken so long.
Yes, spent quite a few years in heavy construction (North-West gas shelf).
It was the diagonal cut that interested me too. I came to the conclusion that given the quality of the steel, rather than slag, it was solidified molten run, which most times has to be gound off. Just out of curiosity, isn't the slag formed during welding largely a result of the flux on the rod?
cheers
marz
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