Flexible FPC circuit board welding procedure

The welding procedure of flexible circuit board is as follows:  

1. Before welding, apply flux on the pad and treat it again with the soldering iron to avoid bad tin plating or oxidation on the pad, resulting in bad welding. Chips generally do not need to be treated.  

2. Carefully place the PQFP chip on the PCB with tweezers, taking care not to damage the pins. Align it with the pad, ensuring that the chip is placed in the correct direction.  Adjust the temperature of the soldering iron to more than 300 degrees Celsius, dip the tip of the soldering iron tip with a small amount of solder, press down the chip in the aligned position with the tool, add a small amount of flux to the two diagonal positions of the pin, still press down the chip, weld the two diagonal positions of the pin, so that the chip can not move.  Recheck chip alignment after soldering diagonal.  If necessary, it can be adjusted or removed and re-aligned on the PCB.  

3. To begin welding all pins, add solder to the tip of the soldering iron and apply flux to all pins to keep them wet.  Touch the end of each chip pin with the tip of the soldering iron until you see the solder flowing into the pin.  During welding, the tip of the soldering iron should be kept parallel with the soldering pin to prevent the overlap due to excessive solder.  

4. After soldering all the pins, wet them with flux to clean the solder.  Suck off excess solder where needed to eliminate any short circuits and lap joints.  Finally, use tweezers to check for soldering. When finished, remove flux from the circuit board, dip a bristles brush in alcohol and wipe it carefully in the direction of the pins until flux disappears.  

5. Patch resistance and capacitance components are relatively easy to weld, you can first point tin on a solder spot, and then put on the end of the component, with tweezers to clamp the component, after welding a head, and then see if it is put right;  If it is, weld the other end.  

Polly peak as a professional FPC soft board manufacturers, we are in the direction of the digital camera, car satellite positioning device, liquid crystal TV, notebook computer, medical instrument, intelligent robot, mobile phone and so on are involved in the communication field and research and development, thank you very much for support for polly peak, many customers are willing to work with us hand in hand advance together, welcome more customers come to discuss cooperation.