[UT] Plasma Torch vs. big metal door on a spaceship?

[vicky_molokh]

Greetings, all!

I remember that drills and rotary hammers treat wooden, brick and stone obstacles as [semi-]ablative. However, I do not remember any similar notes about gradually cutting metal obstacles, even for things like the plasma torch (which does burning damage). So my questions are:

• Am I missing a rule about torches doing corrosion damage instead of burning when focusing on a single section of a hull/wall/door/etc.?
• If not, how does one cut down through metal armour and doors, since those tend to have non-ablative DR that increases with thickness.

Thanks in advance!