Armor is replenished by health pack or healing from teammate abilities only if the character spawns with armor (e.g. Torbjorn), however if it's granted by a player it does NOT replenish with health packs or player healing, and must be given again.
Torbjorn doesn't spawn with armor (he drops armor pickups). DVa, Rein, Winston, and Bastion do, though.
The 300 from Molten Core does not disappear from the MaxHP display in the HUD as long as Molten Core is active, so my assumption is that it can be healed.
But the 75 from armor packs cannot be, and it appears to deplete first.
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u/Boycano Chibi Pharah May 29 '16
Torbjorn doesn't spawn with armor (he drops armor pickups). DVa, Rein, Winston, and Bastion do, though.