Do Legion Artifact Weapons Scale in Shadowlands Leveling?

Legion artifacts do not automatically scale with your level, but you can upgrade them with Relics, which are inserted into the three relic slots at the top of your artifact weapon interface.  You do not need to visit your Order Hall to interface with the artifact forge to do this.   To open this interface, shift-right-click the artifact weapon to see the relic slots.  The third slot is unlocked as you progress through your Class Order Hall campaign.  This allows you to keep your artifact weapon equipped throughout the Legion content if you choose the Legion Timewalking campaign from Chromie.