The characteristics of selective soldering may be understood with the aid of evaluation with wave soldering. The maximum obvious difference between the 2 is that the lower part of the board within the wave soldering is completely immersed inside the liquid solder. Within the selective soldering, just a few specific regions are solder wave touch. Since the board itself is a bad heat transfer medium, it does no longer warmness the solder joints that melt adjacent additives and board regions all through soldering.