I have often watched aluminium casting processes that have a lot of oxidised metal accumulating on the surface and that makes me wonder if they have ever used a

I have often watched aluminium casting processes that have a lot of oxidised metal accumulating on the surface and that makes me wonder if they have ever used an Argon or Nitrogen as a blanket because this dross often gets dragged into castings = defects, many of which are hidden? Does Tesla blanket their system with inert gasses? One can even think a whole room could be blanketed, if it was remote operated - or the staff wore air supplies? It would take an assessment to create the minimalist inert system with air, and a remote system = no air needed??