Anything steel can be welded with the low priced wire-feed welders that use fluxed wire. It just takes a lot of practice matching amperage and wire feed speed. The companies that sell these units also claim they can be used to weld aluminum. But don't try it. You really need an argon gas shield to do that. I actually do a lot of aluminum welding with the typical oxy-acetelene torch. I recieved my aviation airframe certification which required that ability, and found myself using that technique fairly often because there is less cracking after the weld cools. TIG welding would be my other choice. But really, for non-structural joints, like that headlight trim ring, I would braze rather than weld.
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