Welding anodized aluminum
I have welded alum anodized and never cleaned
the process is simply a button on my tig torch
Full amps a puddle rod stop then next puddle rod and so on
This is the pipe welding process for anodized pipe

I use a sink wave 250 ac
All boat tops and towers are anodized either black silver or gold

The process works on all aluminum you will have to clean dirt and grease
Hope this helps