Operation Points of THT Wave Soldering
The wave soldering machine, THT wave soldering equipment, DIP wave soldering process is that after the components are installed, the printed circuit board is sent into a flux coating device. Spray flux on the printed circuit board. After being painted, send it to a preheater to preheat the printed circuit board. Then it is sent to the wave soldering machine tank for welding. The welding time is about 3s. The soldered printed board is cooled by strong wind, and the cooled circuit board is sent to a cutting machine to cut off the lead pins of the components. After the pins are cut off, the circuit board is washed. The rear circuit board is sent to the hardware assembly line for complete machine assembly.
In actual applications, dip welding and wave soldering have also appeared. There are dip welding as the first welding, and wave cutting as the second welding is performed after cutting the foot
Key points of wave soldering equipment operation
1. Welding temperature. The temperature at which the soldered part is in contact with the molten solder wave. The general temperature is controlled between 230250 ℃, but it needs to be adjusted accordingly after the test according to the actual working conditions.
2. Wave height. The crest should be stable, and the height of the crest is good. The height of the surface of the applied wave should be 1/2/2/3 of the thickness of the printed circuit board. Insufficient height often leads to missing welding. If the wave drop is too high, the solder joint will be pulled and the tin will be accumulated too much. It is also easy to make tin temperature burn to components v on the surface of the circuit board plug-in and cause the entire printed circuit board to be scrapped.
3. Transmission speed. The general transmission speed is in o. Within the range of 81.5 nJmin, the actual speed depends on the specific situation. If the speed is too high, the soldering time will be too long and the temperature will be too high, which will easily damage the printed circuit boards and components. Too fast. If the welding time is too short, it is easy to cause false welding, missing welding, bridging, and bubbles.
In addition to the above three points. Also pay attention to controlling the transfer angle, daily cleaning of the solder in the oxide in the tin bath for quality analysis.
❙ Wave Soldering Equipment Video