Originally posted by: DrPizza
Wow, I never before realized soldering irons could be that expensive. I understand that you get what you pay for though. What would I be able to do with an expensive soldering iron that I can't do with a $20 model? (Not being sarcastic, truthfully, I'd like to know. I'm actually going to be teaching students how to solder in a couple of weeks... it'd be good to know)
If you're teaching basic soldering skills, not much. If you're trying to do surface mount soldering, there's alot. The more expensive irons have adjustable heat. 650F works well for lead/tin solder, but 700F works better for silver solder (it doesn't melt until much higher, 550F instead of 450F). 800 lets you burn traces and pads off for rework. The more expensive irons also heat up much quicker. The cheapy $15 irons take 5-10 minutes to heat up, the WES50 takes 1-2 minutes, and the MT1500 takes about 10 seconds, and can "idle" at 400F to save on tip life and be back upto 650F in two seconds. The more expensive irons also have a wider variety of tips, both smaller and larger. And in fine pitched soldering smaller isn't just better, it's required. In the very high end, desoldering attachments are available that use hot air and vaccuum. The cheaper irons also cannot heat large lugs and terminals well, they just lack the overall power. The less time you have to have your iron on something, the better.