[Radio Wrangler]

I just disagree with Frank on one point. I was taught not to carry solder to the joint on the iron, but to feed it onto the joint. Have enough solder on the iron to act as a heat conductor from the iron to the joint. Use it to heat the joint to soldering temperature and then feed enough solder directly onto the hot joint. You should see any cored flux go active, and you should see the solder flow and wet with low viscosity and active surface tension. This too was on an aerospace training course (RR/BAC Filton in the early 70s)

David