Doesn't seem like the link provided this answer, so here it is:
Damage cap = dmg * 2
Where dmg is the weapon's stated damage.
I don't quite know how, but I have gone over this on an Ogre SK (doing 19 damage with a rusty two-hander) and my Iksar Warrior (doing the same amount of damage with his 9 dmg pike).
So people hitting for 40 damage with a 2hander are using a weapon with 20 damage.
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Marlon: Halfling Druid of the Trees
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