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Manual Welding Technique Of Patch Capacitance
May 30, 2018

Manual welding technique of patch capacitance

1. first apply flux on the weld plate, then use the iron to deal with it again, so as to avoid the bad or oxidation of the tin plate, which can cause bad welding, and the chip can be welded without treatment.

2. use tweezers to carefully place PQFP chips on the PCB board. Care should be taken not to damage the pins. Aligns it with the pad to ensure that the chip is positioned in the right direction. The temperature of the soldering iron is adjusted to about 300 degrees Celsius, a small amount of soldering tin is stained with the tip of the soldering iron. The chip is pressed down by the tool and a small amount of flux is added to the pins of the two diagonal positions. The chip is still pressed down and the pins on the two diagonal positions are welded to make the chip fixed but not moving. After checking the diagonal angle, check whether the chip position is aligned. It is necessary to make adjustments, remove them and re position them on the PCB board before welding.

3. when welding all the pins, solder should be added to the iron tips, and all the pins shall be coated with flux to keep the pins moist. Contact the end of each pin with the tip of the soldering iron until the solder is inflow into the pin. When welding, keep the soldering iron tip parallel to the welding pin to prevent overlap due to excessive solder.

4. after welding all the pins, solder all the pins with solder to clean the solder. Remove excess solder to remove any short circuiting and lap joints wherever needed. Finally, use the tweezers to check whether there is any welding. After the inspection is completed, remove the flux from the circuit board, soak the hard brush on the alcohol and wipe it in the direction of the pin until the flux is lost.

5. The patch resistance element is relatively easy to weld. You can spot tin on a solder joint first, then put one on the element, clamp the element with tweezers, and then see if it is correct. If you have put it right, then weld another head. It takes a lot of practice to really grasp the welding skills.