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Causes and Countermeasures of Bad Cold Soldering

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Update time : 2022-11-29 15:36:48
If the surface of the cold solder joint is not smooth, in severe cases, the tin wire will be around the line pins and cause wrinkles or cracks. Such solder joints generally have a short service life, and they will be disconnected after a period of use, resulting in poor soldering of the circuit.
There are many reasons for poor cold solder joints.
1. When the solder joint is solidified, it is shaken;
2. The parts to be welded are oxidized, which is not conducive to soldering;
3. Insufficient soldering time;
4. Improper cooling.
The solution is:
1. The source of vibration will be generated when contacting welding, which is related to economic problems.
2. Remove the oxide layer on the object to be welded.
3. Adjust the soldering speed, adjust the contact area between the PCB board and the solder material, and set the dipping time of the PCB board within 3-5 seconds, which is generally an appropriate soldering time.
4. Improper cooling. After the PCB board comes out of the soldering furnace, adjust the slope to 2-2.5°C, and make the glass transition temperature of the PCB board max 100°C before moving.
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