Does electric iron need no rosin?
Can, but only in small welding joints, because welding range is small, you can use the solder wire, solder wire and is hollow, there is a large range of rosin. If welding, the solder wire is not easy to use, it is necessary to use solder, solder with rosin is not required. The extra clean soldering rosin
Rosin is a soldering flux. See what you weld. If you solder gold fingers, you'd better paint it.
Use solder paste, rosin is not good
