SOME NOTES ON SOLDERING PCBs and other things:
- use resin core electronic solder. I use 1 to 0.7mm for fine work including PCB circuits.
- the resin is the FLUX to help remove oxides from the surface. It is in small “veins” within the solder (60%tin 40%lead).
- if you melt the solder onto the tip of the soldering iron, all the flux goes up in smoke!
- to make a good electrical join, clean the surface to be soldered using a scouring pad / fine wet & dry abrasive paper/ “Ajax” or similar abrasive powder / fibre glass brush (horrible things that shed dangerous tiny pieces of fibreglass).
- clean the tip using a wire pad (or use a damp sponge)
- “tin” (coat) the tip of the soldering iron with a tiny bit of solder (this helps to conduct the heat to the join)
- heat the join area with the tip of the iron and simultaneously feed in some solder to the joint.
- Only use a liquid flux if it is non corrosive – I only use that when soldering rail or brass kits. Such a flux needs to be washed off with water.
- In the photo below the solder has been fed briefly to the gap between the tip and the copper. In this case to prepare a spot ready to receive the leg of a component.
SOLDERING BRASS / RAIL / WHITE METAL: