Operation points of wave soldering equipment

Operation points of wave soldering equipment
1. Soldering temperature of wave soldering equipment

The soldering temperature of wave soldering equipment refers to the temperature of the soldering technology peak at the nozzle outlet. Generally, the temperature is 230-250℃, and if the temperature is too low, the solder joints are rough, pulled and not bright. It even causes virtual welding and false incandescence; if the temperature is too high, it is easy to accelerate oxidation, deform the printed circuit board, and burn all components. The temperature adjustment should be adjusted according to the material and size of the printed board, the ambient temperature, and the speed of the conveyor belt.

2. Remove the tin slag in the wave soldering furnace on time

The tin in the tin bath of the wave soldering equipment is likely to form oxides when it is in contact with the air for a long time. If the oxides accumulate too much, they will be sprayed onto the printed board with the tin under the action of the pump. Bit solder joints into the luster. Causes defects such as slag control and bridging. Therefore, it is necessary to remove oxides regularly (usually every 4 hours). Antioxidants can also be added to the molten solder. This not only prevents oxidation but also reduces the oxide to tin.

3. The height of the wave crest of the wave soldering equipment

The wave height of the wave soldering equipment is best adjusted to 1/2-1/3 of the thickness of the printed board. If the wave crest is too low, it will cause solder leakage and tin hanging, and if the wave crest is too high, it will cause too much tin piling. Very hot components.

4. Transmission speed of wave soldering equipment

The transmission speed of wave soldering equipment is generally controlled at 0.3-1.2m/s. Determined on a case-by-case basis. In winter, when the printed circuit board has wide lines, many components, and large heat capacity of components. The speed can be slightly slower; the reverse speed can be faster. If the speed is too fast, the welding time is too short. It is easy to cause the phenomenon of house welding, false welding, missing welding, bridging, air bubbles, etc.; the speed is too slow. The welding time is too long and the temperature is too high. Easily damaged printed circuit boards and components.

5. Transmission angle of wave soldering equipment

The transmission angle of wave soldering equipment is generally selected between 5-8 degrees. It is determined by the area of ​​the printed circuit board and the number of components inserted.

6. Analysis of the tin composition in the wave soldering bath

The use of solder in the tin bath of wave soldering equipment is called after. It will increase the impurities in the wave soldering lead solder, mainly copper ion impurities affecting the welding quality. Generally, it takes 3 months for laboratory analysis – times. If impurities exceed the allowable content, measures should be taken to replace them.