Say you want to create a social network for soccer moms to chat and commune. Instead of building up the social site first and relying on the 8 soccer moms you know to get it going, it's better to create a blog with tips targeted toward soccer moms. Build it up with stories and useful tips other soccer moms need.
The main composition of a soldering iron is a metal tip, which is heated in an insulated handle by either gas combustion or electricity. Today, electronics soldering iron is widely used in repair jobs, installations, electronic assemblies and so on. It is also used for pyrography as well as plastic welding, although very rarely seen.
Brazing, or soldering, involves a filler metal or alloy (a combination of metals) which has a lower melting point than the metal pieces to be joined. The filler materials (such as lead and cadmium) can be very toxic. Metal cutting is done by heating the metal with a flame and directing a stream of pure oxygen along the line to be cut.