Hot air solder leveling
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HASL or HAL (for hot air (solder) leveling) is a type of finish used on printed circuit boards (PCBs).
Advantages of HASL
- Excellent wetting during component soldering
- Avoids copper corrosion.
Disadvantages of HASL
- Low planarity on vertical levelers may make this surface finish unsuitable for use with fine pitch components. Improved planarity can be achieved using a horizontal leveler.
- High thermal stress during the process may introduce defects into PCB