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Radial Engine ToyView Instructable »
I have never tried to solder steel, but I think it would be possible.Making the rose from copper sheet pieces soldered together would be quite easy. However, if you don't have access to the welder, I would consider using some two compound epoxy to glue everything.Also, have a look at this instructable https://www.instructables.com/id/How-to-Make-a-Metal-Rose-Without-Welding-and-Forgi/
Welded BouquetView Instructable »
Better not, otherwise we're doomed :DPS. There is a short clip with the arm in motion in the last step if you haven't seen it.
Robot arm inspired by Termi...View Instructable »
Welded Wheatley from Portal...View Instructable »