Double-sided circuit board soldering should pay attention to these problems

Compared with single-sided circuit boards , double-sided circuit boards have higher wiring density and smaller apertures. The metallized holes on which the layer-to-layer interconnection relies are directly related to the reliability of the printed circuit board. With the reduction of the aperture, some debris, such as grinding debris, volcanic ash, etc., once left in the small hole, will make the electroless copper deposition and electroplating copper useless.

In order to ensure that the double-sided circuit has a reliable conductive effect, the connection holes on the board should be welded with wires first, and the protruding part of the tip of the connection wire should be cut off to avoid hurting the operator's hand. This is the preparation work for the connection of the board.

What problems should be paid attention to when welding double-sided circuit boards?

1. For the equipment that requires shaping, it should be shaped first and then plugged in according to the requirements of the process drawings.

2. After shaping, the model side of the diode should face up, and there should be no difference in the length of the two pins. pcb double panel

3. For equipment with polarity requirements, it should be noted that the polarity must not be reversed when inserting. After inserting, whether it is vertical or horizontal equipment, there should be no obvious skew.

4. The power of the soldering iron used for soldering is between 25 and 40W, the temperature of the soldering iron tip should be controlled at about 242°C, and the soldering time should be controlled within 3 to 4 seconds.

5. When welding, it is generally operated according to the welding principle of equipment from short to high, from the inside to the outside. The welding time should be grasped well. If the time is too long, the equipment will be scalded, and the copper-clad lines on the copper-clad plate will also be scalded.

6. Since it is double-sided welding, a process structure for placing the circuit board should also be made , the intention is not to slant the equipment below.

7. After the welding is completed, a comprehensive inspection should be carried out to check the places where there are leaks and leaks. After confirmation, the remaining pins of the equipment should be trimmed, and then flow into the next process. Industrial control pcb circuit board

8. The specific operation should also strictly follow the relevant process standards to ensure the welding quality.

The above are the issues that need to be paid attention to when soldering double-sided circuit boards. Pay attention to Tengxingsheng. Welcome to consult any questions about PCB circuit boards at any time.