EDIT: to summarise it shows a cross section that showcases the quite impressive bond between aluminium and titanium apple made. It shows the thickness of said titanium. The youtuber seemed quite impressed as well.
However in the previous video he mentioned he had ways of proving if it was grade 5 titanium, but I guess that never happened.
I also wished he had use the torch more to change the colour of the titanium, but that’s just purely personal curiosity.
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