Fri Mar 27, 2020 6:38 pm
#1756260
I may be talking total carp here, but, AIUI, the Aloominum sheet is actually coated effectively, main sheet is " A " and it's coated both sides with " B "
Hence, raw . cut edges (and holes) all expose the "core" metal. used to use "Scotchbrite" wheels over 50 years ago, when they first came out....for removing weld-discolouration on Stainless- Steel, yacht-mast fittings, preparatory to mirror-polishing. deburring S/S would strip a wheel down to the hub in seconds.I would think it a bad move to use such an aggressive medium on any sheet Alloy on an aircraft.
I also believe that the RAF discontinued polished- aluminium aircraft when they found out just how much gets polished away, over a period!
The "laminated "sheet has pure aluminium and alloy. I suspect the core is alloy and the outer surfaces , pure aluminium? Anyone know more??
Hence, raw . cut edges (and holes) all expose the "core" metal. used to use "Scotchbrite" wheels over 50 years ago, when they first came out....for removing weld-discolouration on Stainless- Steel, yacht-mast fittings, preparatory to mirror-polishing. deburring S/S would strip a wheel down to the hub in seconds.I would think it a bad move to use such an aggressive medium on any sheet Alloy on an aircraft.
I also believe that the RAF discontinued polished- aluminium aircraft when they found out just how much gets polished away, over a period!
The "laminated "sheet has pure aluminium and alloy. I suspect the core is alloy and the outer surfaces , pure aluminium? Anyone know more??