13 points for attention before smt processing and welding of pcba plate

13 points for attention before smt processing and welding of pcba plate

1. The pcba board must be well treated before smt processing and welding, and the bonding pads of components and circuit boards must be in a solderable state.

2. During smt processing and welding, your hair should not be twisted with the wires, especially for women with long hair. You must wear an anti-static hat and roll up your long hair during smt processing and welding.

3. Some employees with sweaty hands should wear gloves to avoid electric shock accidents.

4. The power plug of the electric soldering iron must contact the socket properly to avoid looseness, damage and injury.

5. If the electric soldering iron is used every day, the power socket switch should be used to control the power on and off of the electric soldering iron, or the power switch should be installed on the power line of the electric soldering iron to avoid frequent plugging and unplugging, which may lead to loose plug and poor contact, and finally lead to accidents

6. During smt processing and welding, the soldering head shall not be immersed in the flux for a long time, and other highly corrosive chemical industrial products shall not be used as the flux.

7. Small power electric soldering iron sometimes cannot reach the heat, and the welding time is too long, which is easy to burn the electronic components. You can choose a slightly higher power electric soldering iron with sufficient heat, which can reduce the welding time. The solder joint receives less heat, but will not be damaged. Therefore, you need some practical experience in selecting electric soldering iron.

8. Choosing rosin as soldering flux can improve the wetting effect of electronic components and increase the solderability of components. The brazing flux can be directly made of rosin block or prepared into rosin alcohol solution. Due to the volatility of alcohol, the bottle cap should be tightened after the use of rosin alcohol solution. A small piece of cotton can also be put in the bottle, which can be clipped and coated on the printed circuit board or component leads with tweezers in daily use.

9. Note that there is a kind of solder paste (also known as solder oil) on the market, which is corrosive and is used in industry and is not suitable for electronic product welding. Also, the rosin perfume on the market is not the rosin alcohol solution mentioned in this book, so electronic enthusiasts must pay attention when choosing injections.

10. The integrated circuit shall be welded last in the whole electronic product, and the anti-static bracelet must be worn when welding, and the electric soldering iron must be reliably grounded. The special socket for integrated circuit can also be used, and the integrated circuit can be inserted after the socket is welded. This method is convenient for the maintenance and replacement of chips that are often used and are frequently damaged.

11. After smt processing and welding, wipe the residual flux on the circuit board with alcohol to prevent the carbonized flux from affecting the normal operation of the circuit.

12. Turn off the power and clean the desktop after welding.

13. After the electric soldering iron has been used frequently for a period of time, the power cord needs to be replaced to prevent the root or the inside of the power cord from breaking.

The circuit board manufacturer, circuit board designer and PCBA processing manufacturer will explain 13 points for attention before smt processing and welding of pcba boards.