This takes a little setup...
At level 3, an Artificer takes the Armorer sub-class. One of the features is Armor Model which can be configured so that they have Thunder Gauntlets.
Each of the armor's gauntlets counts as a simple melee weapon while you aren't holding anything in it, and it deals 1d8 thunder damage on a hit.
They technically have two weapons as discussed here and here. So they can attack with one fist or the other. And at level 5, they get Extra Attack and can either punch twice with one hand or once with each hand Discussed here
At level 9, their armor gets an upgrade:
You learn how to use your artificer infusions to specially modify your Arcane Armor. That armor now counts as separate items for the purposes of your Infuse Items feature: armor (the chest piece), boots, helmet, and the armor's special weapon. Each of those items can bear one of your infusions, and the infusions transfer over if you change your armor's model with the Armor Model feature.
Can each gauntlet be infused with its own infusion?
Since the description says, "the armor's special weapon," and the special weapon is/are the pair of gauntlets, each of which is a weapon in its own right. I would think it's possible.
Can the Artificer infuse one gauntlet with "Enhanced Weapon" and the other with "Radiant Weapon"?