If the powder coat gets up to 400F then it would soften solder.
But my question is would the factory hold gas tanks together with lead solder that may crack with expansion/contraction and vibration? Or is it steel welded?
Unless it has been repaired with solder-???
Only way I can see it being soldered is with low lead content meaning higher temperature.
Why would it soldered instead of welded would be for any leaks that the welding didn't cover. But I find that unlikely.
Have a look here, they would braze the tank instead of soldering.
A 1930 s triumph tank was brought into the workshop with the customer saying he cannot find anyone to restore it to it’s original fuel capacity. The problem being it had been “Petsealed” 30 years ago and the modern fuels containing ethanol were attaching the old style sealant, thus causing a lot...