Is there any way to solder a copper block to a small wire with an electric iron, and each soldering does not stick?,
First polished and polished copper pieces, is not the surface oxidation?
Polish the copper pieces with sandpaper. Use some solder paste
Glue it first and then solder it
Copper temperature and surface oxidation, coating will affect the welding effect. Polished rough surface is also conducive to adhesion, copper block if a little larger, you can consider heating up, active copper molecules, relatively easy to adhesion
