How about 3 mm diameter stainless steel wire welding?
After all bending, use resistance welding, also known as contact welding. If it is made of a single piece, use gas protection to weld the solder joint.
The DC TIG welding of stainless steel wire is of the best quality. Bending steel wire for general homemade profiling or profiling positioner (usually manually), or a can rely on.