Can't solder anymore -> solder doesn't melt and stick on the board
February 18, 2011
Hi all. I've got this cool digital soldering station this morning and boy was I exited! At last I could solder my 1 robot kit! Well after soldering 30 or so contacts + soldering in the axis I couldnt solder anymore! Here's what happend:
1. Since I thought any solder would do (lame huh?) I bought the cheapest Sn99.3Cu0.7 solder. And since I thought it has the same melting temp. as Sn60Pb40 I soldered at 360 C / 680 F.
2. It went all good but after a while the solder wouldnt melt. So I raised the temperature to 450 C / 842 F :)
3. It helped only for a while and after that the solder wouldnt melt even if applied directly to the tip!
4. So I took my sandpaper and cleaned the tip. It helped only a little bit.
5. After all that torture here is what happens: If you apply solder to the tip the solder melts but doesnt stick to the tip! The "ball" of melted solder remains on the solder wire! Of course you cant solder any contacts because you cant heat up the contacts to the melting temperature!
I'd say total fail. I already ordered new iron tip and Sn60Pb40 solder but Iam not sure it will help? And I always cleaned my iron in a wet sponge before and after the soldering. I shouldnt done it after, right?
Main questions would be:
a) What should I do to be able to tin the iron tip again? I cant do that even after using the sandpaper!
b) Can I use my lead free Sn99.3Cu0.7 solder with some solid rosin I have? I how do I do it? What temperature do I use and how do I apply the rosin?