A soldering iron is used to heat the connections to be soldered. For electronic circuits, you should use a 25- to 40-watt (W) soldering iron. Higher wattage soldering irons are not necessarily hotter; they are just able to heat larger components. A 40-W soldering iron makes joints faster than a 25-W soldering iron does.
Soldering will be more consistent and the improved quality will mean less rework. The faster and more efficient use of current during actual soldering lowers consumption. Resistance Soldering Handpieces are generally lighter than irons, reducing operator fatigue. Thermal damage to heat sensitive components will be minimized.
The term silver solder denotes the type of solder that is used. Some soft solders are "silver-bearing" alloys used to solder silver-plated items. Lead-based solders should not be used on precious metals because the lead dissolves the metal and disfigures it.