The upgrade table is used to exchange scrap and ore collected in the world for upgrades to faction weapons such as the heat seekers for the rocket launcher, or friendly fire avoidance for the Arc Welder and Proximity Mines.
there is an upgrade table at every red faction base, and one in the Badlands Stronghold, even if the player cheats across the Irradiated Zone. the marauders will attack you until the alliance however and keep respawning so keep that in mind. the upgrade table is run by the lead engineer for the faction, samanya. the upgrade table is always in its own building with the Red faction radio dispatch, and is marked as the safe house on your minimap. the building resembles US korean and vietnam war barracks.