I can weld aluminum, thin sheetmetal, stainless, steel, well heck pretty much anything except I dont have the booth equiptment to setup the proper atmosphere to weld titanium.
Both my front and rear bumper/grab bar are aluminum tubing made and welded from scratch. Was straight alum tubing.
If there is a decent shop around you that has a TIG machine, and a half decent welder, they should be able to weld whatever it is. If its been chromed, it can still be welded, but it wont be shiny after welding it.