Soldering is a process that uses
molten metal or an alloy of low melting point below 450oC to
join or bind two metal parts. The alloy or metal is also referred to as
a solder. The metal that is added during soldering process has a melting
point lower than that of the workpiece. Heat is applied uniformly to the
metal parts and the alloy metal is pressed against the joint, which
melts down. The molten matter is then drawn into the joint by capillary
action and around the materials to be joined by wetting action.
In this process, only the added metal is melted and not the workpiece.
As a result, soldering generally do not create distortions or weakness
in the workpiece that can occur with welding. Soldering is generally
used to join electrical, electronic and other small metal parts.
There are many different ways by which soldering can be done. This
includes passing parts over a bulk container of melted solder, using an
infrared lamp, or using a point source such as an electric soldering
iron, a brazing torch, or a hot-air soldering tool. Sometimes flux is
used to aid the joining process.
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