lab,

You can easily TIG weld or braze. Use the process you feel most comfortable with.

If you use TIG, i'd recommend doing it autogenously. Be advised, however, as it requires good vision and steady hand/eye coordination. You'll also need to put-up with a welding hood (of the auto darkening variety). I find torch brazing (seen below) much more relaxing. Harris 56 is a better cosmetic match, melts at a slightly lower temp than 45, and is easier to avoid unecessarily large fillets. The piece shown, is made entirely of bike parts - including 1.8-2.0 mm stainless spokes.