Bridging connection is also called lap welding, which means that when welding a printed circuit board, the solder joints of each component are independent, there is an unexpected connection between the copper foil and the solder joints of the circuit that should not be connected to each other, which is called bridging connection.
Bridging connection is a craft problem of circuit board defects that has an impact on the quality of the board. Some of this kind defects can be easily judged, and some can be distinguished by visual methods, such as bridging connection by hair-like fine solder, which can only pass electrical property test or AOI optical online inspection instrument to judge.
What are the factors that cause bridging connection?
During manual welding,bridging connection often occurs in printed circuit boards with high density solder joints’ place, often due to solder tailing when the soldering iron tip is removed; there is also other cases.If too much solder is used, which will overflow welding pad, and the accumulation near the solder joint will also cause the bridging connection defect craft; if the temperature is too high, the solder of the adjacent solder joint will melt, which will also cause the bridge connection occurring.
There are many factors causing bridging connection, and the above are some of them. If bridging connection is not handed in, the two solder joints that should not have electrical connection have electrical connection, causing short circuit between the circuits, and lightly damage the components to affect the performance of the product.Seriously personal safety accidents will occur.
Therefore, when the circuit board manufacturer is welding the circuit board, it is necessary to train the relevant operators, and if necessary, to check the solder joint quality of the circuit board, and when the solder joint of the circuit board is connected, it needs to be modified to avoid economic loss caused by the defective product.
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