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I've got to solder the headers onto two Ttgo LORA esp32 boards today.
Ttgo are about as cheap as you can get. Last time I soldered one all of the contacts peeled off. To do it right you need to heat for the absolute minimum time but not too short because if you undercook it you'll just have to reheat and probably peel the copper off that way.
My criticism of @Colm89 's soldering is probably coming back to bite me today.
Stonehedge
cyclotron3k
The soldering looks pretty good to me.