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So normally, you get a D6+Str to glance/pen

With an Armorbane weapon "instead you get 2d6"

But with Melta you "roll an additional D6 when rolling to penetrate a vehicle's armor at half range or less"

So just to be clear here, a character with armorbane and a Melta weapon is rolling 3d6+Str to penetrate vehicle armor

Seems pretty clear cut to me. Although the instances are few and far between, it sure would be awesome with an already Str 6 or 8 Melta weapon

Second paragraph, the Shooting weapon has to have Armour bane.

If you had a Melta & Armour bane weapon; then yes you would have a 3d6+S Pen

But your model having Armour Bane and firing a Melta is still only 2D6+s

A character having that rule means his close combat attacks roll 2d6, just like Rending,Poison,... It doesn't transfer to his shooting attacks.As pointed out by Kel, it's clearly written in the Armourbane rule

Also note that the "Melta rule" and "Armorbane" are seperate rules. So those pesky vehicles with ceramite type armor that negate the 2nd dice on the melta rule does not effect the armorbane weapon.
In short...you roll 1d6 with a melta gun (melta USR), but get 2d6 with melta bombs Armorbane USR).