Soldering irons used in electronic applications typically feature wattage between 15 and 100 watts. Soldering irons are usually small, and they are sometimes called pencils because of their shape and size.
Soldering irons join metals or other surfaces. They are ideal for soldering printed circuit boards and other electronic components, such as resistors and diodes. Many soldering irons come as kits with knobs or buttons on the solder station unit that control the iron temperature. Soldering guns have much more wattage, usually between 110 watts and 500 watts. Because they are significantly more powerful than soldering irons they are better suited for medium- to heavy-duty applications.