Sharpening refers to the protrusion of thesolder sharp corners on the solder joints of the copper foil circuit terminalsof the circuit board, and there are obvious sharp points. This situation iscalled solder joint sharpening.

What are the factors that cause solderjoint sharpening?

1. It is possible that during manualsoldering, the soldering iron tip on the operator's hand may be removed prematurelywhen the solder is not completely melted and fixed.

2. The temperature is too low duringwelding. But most of the reasons are that the flame iron tip is moved too late,the welding time is too long, and the flux is vaporized. That is to say, thetip is related to temperature and operation.

What are the effects of solder joints onthe circuit board?

In addition to the poor appearance of thesolder joints of the circuit board, when the solder joints exceed the allowablelength, the insulation distance between the solder joints is reduced, which islikely to cause bridging. It will cause sparking in high-frequency andhigh-voltage circuits, so pay special attention to it.

Solution: The welding time should not betoo long. Once the tipping phenomenon occurs, just add flux and re-soldering.In automatic soldering, pay attention to the angle of the printed circuit boardfrom the solder liquid surface