The process, by which conventional leaded components are soldered
into a PCB, is known as the selective soldering process. Initially, the
‘hard-to-get’ areas of a circuit board were carried out by hand operators using
the soldering iron. This process has now become a recognized design process in
the PCB manufacturing industry. The process is conducted once the surface mount
reflow operation is done. One of the primary reasons why selective soldering in
China is the most preferred option is because selective soldering is an
automated system.
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When it is a tall component height: The height of the solder wave
comes with limitations. Some components are tall enough that they will block
the wave from soldering the board.
Tight component spacing: When the thru-hole components are placed very close to the SMT components, there may not be too much room to fit a protective fixture around the SMT parts that allow effective wave soldering.
Dense condensation of thru-hole pins: When the large connectors are used with numerous pins, it might get difficult for a soldering iron to get in each pin for soldering them effectively. In all of the above-mentioned scenarios, selective soldering can offer a cost-effective and efficient solution.
