Originally Posted by
demond0d5
"tinning" is simply coating the material...not actually joining it. Joining it is called soldering. Hence why you "tin" the soldering iron prior to working or "tin" the wires before joining. Tinning allows the heat to transfer easier from the iron as the material is already at a melting temperature and has a lower specific heat index than the material (copper, silver, etc) being soldered together.
The more common method of soldering is to overlap the wires parallel to each other, twist them together, and then solder. This is much easier because you only have to hold 3 things at once, the iron, the solder, and the conjoined wires (if unsupported), as opposed to the other method requiring you to hold both wires next to each other, the iron, and the solder (if you choose to strengthen the bond further)