My first job was making Hornby Train Transformers, the main job in this was soldering the tabs and wires together !
I use an 26 year old Weller 100watt iron with a Flat 8mm tip, never let me down and easily solders 12awg to esc posts.
I agree with above buy a good quality solder reel, cheap market stuff is crap and doesn't contain enough flux.
This is my method.
1. allow the iron to get nice and hot.
2. clean the tip and apply fresh solder.
3. heat the esc post and pre-solder.
4. strip 3-4mm of insulation from the wire, place the bare end on the iron tip and add solder to the tip and build up the solder to the whole wire end turning if necessary.
5. re-heat the post, add more solder to the iron tip, then place the wire end on the post and the iron on top of both, add more solder to the wire/tip if required.
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