HASL or hot air solder leveling is a type of finish used on printed circuit boards (PCBs).
Contents
The PCB is typically dipped into a bath of molten solder so that all exposed copper surfaces are covered by solder. Excess solder is removed by passing the PCB between hot air knives.
Advantages of HASL
Disadvantages of HASL
References
Hot air solder leveling Wikipedia(Text) CC BY-SA