Capillary soldering of domestic copper pipework has been the accepted method of jointing for many years. Quick, efficient, reliable, the soldered joint can be found in the vast majority of properties in the UK. Every plumber should know the basics when it comes to selection of fluxes and solders.
Fluxes are used to keep copper surfaces clean prior to soldering and to enable the solder to wet and adhere to the copper surfaces.
Probably the most important thing to know about solders is: