Soldering iron welding, also known as manual welding, is the basic means of soldering technology. Because of its simple and flexible operation and strong adaptability, it still continues to play a role in the widespread application of automatic welding technology, and is constantly improving and developing.
Welding process technology is one of the most critical process technologies for the production of complete electronic products. The quality of welding can represent the level of assembly technology of an enterprise to a certain extent.
First, Seven Bad Habits in Manual Soldering
Improper use of welding methods can lead to serious appearance failure or even scrap. In order to prevent the occurrence of unqualified soldering process, these bad habits in manual soldering must be avoided.
1. Excessive force. Pressing hard on the solder joint with the tip of the soldering iron does not speed up the heat transfer effect.
2. Improper welding thermal bridge. The tip of the soldering iron must not touch the pad before applying the solder.
3. Wrong size of soldering iron tip. For example, using an undersized tip on a large pad can result in insufficient solder flow or cold solder joints.
4. Excessive temperature. Excessive soldering iron tip temperature will cause the pad to lift, affect the quality of solder joints and damage the substrate.
5. Improper use of flux. Using excess flux can lead to corrosion and electron migration.
6. Transfer welding. Apply solder to the tip before touching the pad.
7. Unnecessary modifications and repairs. Do not rework if the standards are met.
Second,Five-step training to improve welding skills
As a training method for beginners to master manual soldering technology, the five-step method is very effective. The correct five-step method is:
1. Prepare for welding. The tip of the soldering iron should be kept clean.
2. Heating the weldment. Touch the soldering iron to the solder joint, keeping the soldering iron heating each part of the soldering piece.
3. Melt the solder. After the solder piece is heated to a temperature that melts the solder, place the wire over the solder joint to begin melting and wetting the solder joint.
4. Remove the solder. When a certain amount of solder is melted, remove the solder wire.
5. Remove the soldering iron. After the solder has fully wetted the solder joint, remove the soldering iron at 45 degrees.
Three, manual welding precautions
1. Master the heating time. The shorter the time is, the better it is to ensure that the solder wets the solder joints.
2. Maintain a suitable temperature. Keep the soldering iron tip in a suitable temperature range. The general experience is that the temperature of the soldering iron tip is 50°C higher than the melting temperature of the solder.
3. It is wrong to heat the solder joint with a soldering iron. It will cause damage to the welded parts. For example, the welding points of potentiometers, switches, and connectors are often fixed on plastic components, and the result of applying force is likely to cause component failure.
Fourth, the maintenance of the soldering iron
1. Do not leave the soldering iron core energized for a long time to heat it up, and power off in time when it is not in use. This extends the life of the soldering iron core.
2. In the process of using the electric soldering iron, including every time the soldering is completed, the soldering iron tip should always be covered with a layer of tin before the power is turned off. , which is the root of avoiding oxidation of the soldering iron tip.
