SMT processing and welding precautions

SMT processing and welding precautions
1 This PCB must be processed and welded in smt Make sure that the pads of components and circuit boards are solderable
During smt processing and welding, your hair and wires should not be twisted together, especially for women with long hair You should pay more attention During smt welding operation, you must wear an anti-static cap and keep long hair Pull it up
3. Some employees with sweaty hands should wear gloves to avoid electric shock accidents.
4. The power plug of the soldering iron must contact the socket correctly to avoid looseness, damage and injury.
5. If the electric soldering iron is used every day, the power socket switch shall be used to control the switch of the electric soldering iron, or the power switch shall be installed on the power line of the electric soldering iron to avoid frequent plugging and unplugging, which may lead to loose plug, poor contact, and eventually 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 products shall not be used as the flux.
7. Sometimes the small power electric soldering iron can not reach the heat, and the welding time is too long, which is easy to burn the electronic components. You can choose a slightly larger electric soldering iron, which has enough heat to reduce the welding time and the heat received by the solder joint. If the quantity is small, it will not be damaged. In addition, certain practical experience is required when selecting electric soldering iron.
Circuit board

8. Choosing rosin as flux can improve the wetting effect of electronic components and improve the solderability of components. The flux can be directly used as rosin block or mixed with rosin alcohol solution. Due to the volatility of alcohol, the bottle cap should be tightened after using rosin alcohol solution. You can also put a small piece of cotton in the bottle, clamp it with tweezers, and then paste it on the PCB or component lead.
9. Please note that there is a kind of solder paste (also called solder oil) on the market, which is corrosive and is used in industry and is not suitable for welding electronic products. There is also rosin on the market, rather than the rosin alcohol solution mentioned in this book. This electronic enthusiast must pay attention when choosing injections.
10. The welding of the entire electronic product shall be carried out with integrated circuit at the end. During welding, an anti-static wrist strap must be worn, and the electric soldering iron must be reliably grounded. Special sockets for integrated circuits can also be used, and integrated circuits can be inserted after welding sockets. This method facilitates the maintenance and replacement of frequently used and frequently damaged chips.
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. After the welding is completed, it is necessary to turn off the power and clean the desk.
13. After the electric soldering iron is frequently used for a period of time, the power cord needs to be replaced to prevent the root or internal fracture of the power cord.

 The above is the explanation given by the editor of pcb circuit board company.
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