Analysis of PCB short circuit after wave soldering

PCB short circuit

Improper operation of wave soldering will cause a batch of PCB solder joints to short-circuit. PCB short circuit is also poor wave soldering, which is caused by many reasons. Let's analyze the reason of pcb short circuit after wave soldering.

1. The tin liquid has not reached the normal working temperature, and there is a "tin wire" bridge between the solder joints.

2 The direction of the substrate is not well matched with the tin wave, and the direction of the tin is changed.

3. Poor circuit design: The circuits or contacts are too close (there should be a spacing of more than 0.6mm); if it is an arrayed solder joint or an IC, you should consider stealing the solder pad or use white paint to separate it. The thickness of the white paint must be more than twice the thickness of the soldering pad (golden way).

4. The contaminated tin or the accumulated excessive oxides are brought on by the PUMP and cause a short circuit. The tin furnace should be cleaned or the solder in the tin bath should be completely renewed.

5. Continuous tin may be caused by insufficient preheating temperature to reach temperature in the component method. During the soldering process, due to the large heat absorption of the component, it will lead to poor tin dragging and form continuous tin; it may also be the temperature of the tin furnace is low or the welding speed is too fast .

Through the above five points of analysis, I believe you have found the reason for pcb short circuit. And I hope to find the reason for the PCB short circuit of your short circuit board through the above five-point row. If you still can't find the reason through the above five points of investigation, it is probably your wave soldering problem. For example, the displayed temperature is different from the actual temperature of your wave soldering.