RuggedCircuits
at this temperature the contained flux vapors quickly.
And the tip can burn out if you leave it for many hours.
It's correct turn back the temperature.
Lead solder only seems to be reasonable because lower melting point.
GilchristT
"keep lashing solder on until you get some sort of connection"
The solder must fuse properly between the metal wires and the copper plating.
If you can break it off easily it is no good connection.
Terminals soldered into PCBs like you showed, break off after a year or two sometimes.
So it's all reflow solder engineered these days.
The latest trick I saw in televisions is to crimp high power diodes actually, not solder them.
Then big massive rings are pressed into the PCB without soldering.