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If it's metal, just rub a bit of it against another piece of metal and it will cold weld/fuse to it.
This only works on "virgin" metal iirc - if it's been exposed to Earth's atmosphere, it won't work. If you shave off some from the surface I believe it works again.
Like I said- "rub it". The oxidized layer on metal is very, very, thin. It doesn't take much at all to get rid of it.
I didn't realize that the layer was thin enough to rub away with minimal friction. I'd learned about this years ago so I could be misremembering things, but the source I read made it out as if it wasn't a major concern with space exploration because it took substantial effort to cold weld things that had been exposed to air.
Actually, it's believed that some of the failures in early satellites was due to cold welding.
Neat, the more ya know!