In the process of DIP, wave soldering plays an important role in determining the function of PCB&PCBA and final product performance.Wave soldering is to use pump pressure to form specific shape solder waves on the surface of molten liquid solder.When the assembly with the component inserted passes the solder crest at a certain angle, a solder joint is formed in the leads welding area.
The wave soldering machine is mainly composed of conveyor belt, flux addition area, preheating area and wave solder furnace.
The conveyor belt is to send the circuit board into the wave soldering machine, along the way through the flux addition area, preheating area,solder furnace, etc.
The function of the infrared sensor is to sense whether there is a circuit board to enter, and if there is a sensor, it will measure the width of the circuit board.
The flux forms a protective film on the welded surface of the circuit board.
The preheating zone provides enough temperature to form a good solder joint. Infrared heating can heat the circuit board equably.
In a two-crest system, the turbulent portion of the wave prevents solder leakage, which ensures proper solder distribution across the circuit board.The solder penetrates through the slit at a high speed, thus penetrating the narrow gap. The spray direction is the same as that of PCB.The turbulent wave alone does not properly solder the component, it leaves uneven and excess solder on the solder joints, so a second wave is required.The second laminar or smooth wave eliminates the burrs and bridges created by the first turbulent wave.Laminar waves are actually the same as those used in traditional through-hole assemblies.When the conventional components are soldered on a machine, the turbulent waves can be turned off and the conventional components can be soldered with laminar waves.The most common two-crest system on the market today has turbulent waves moving back and forth, and the solder is sprayed from a nozzle rather than from a narrow slit.Moving nozzles are more effective than slits in preventing misses because they not only produce turbulence, but also have a cleaning effect.