[DonRotolo]

I repeat: Do not weld it.

Machining: My best recommendation is to speak with the sheet metal company, THEY work with this stuff all day, every day: Surely they know how to machine it.

In general, it is steel. Cut it with a hacksaw (or metal-cutting band saw), file it, sand it, drill it. Cut thin sheets with tin snips or aviation shears or a nibbler (manual or electric or pneumatic). Bend it, solder it (silver solder recommended, not brazing), rivet it. All are fine.

It should not come into contact with copper, which will cause electrolysis.

On a robot, some steel can be useful, but often it can be too heavy.