20w - 30w or temp controled for breadboard/circuitboard 100-130w for mechanical soldering (i.e. big wires, switches, etc.) the big guns will melt wires, yes ... but thats why i use heatsinks when i solder. (well ... really small hemostats, mums a nurse )
12W for the really delicate stuff. Takes a while to heat solder enough to liquify it, but there's no risk of burning out even the most delicate components. For bigger stuff (switches etc.) I find 25W does the trick nicely.
i just installed a sound system and soldered up 80 or so xlr leads and used a little gas powered one it was awesome, much better for that kind of work than my elec 15w and 30 w ones.
Most components have a solder time... e.g. 10 seconds @ 250C It is best to use a temperature controlled iron when doing delicate work... If you heat the component for too long it will be damaged. Even if the iron isn't all that hot. So if your iron takes a while to heat the joint you only end up cooking the component. But temperature controlled irons cost more. The best tip is to use a fine tip on the iron which makes delicate work must easier, and therefore quicker. Fine solder is also useful as you won't end up with huge blobs on your solder joint.
it may not make much difference as if it is a temperature controlled iron the higher wattage will just bring the tip to temperature quicker and also it wont cool down as much doin a big joint Col
Can't complain about my 20W, its not the best but heats up pretty quickly...not burned any component yet!
