What is Wave Soldering Machine

ETA is the professional wave soldering machine, wave soldering,lead-free wave soldering machine,dip soldering,tht soldering machine manufacturer.ETA provides the best SMT/DIP solutions and equipment.

Wave soldering is a bulk soldering process that enables one to manufacture many circuit boards in a very short amount of time. It works by passing each circuit board over a pan of molten solder. A pump in the pan creates a “wave” of solder that washes over the board, soldering the components to the board. The PCB then receives a water spray or air blowing to safely cool it and fix the parts in place.

After the board enters the wave soldering machine through the conveyor belt, it passes through some form of flux coating device where the flux is applied to the board using wave crest, foaming or spraying. Since most fluxes must reach and maintain an activation temperature during soldering to ensure complete wetting of the solder joints, the board must pass through a preheating zone before entering the peak bath. Preheating after flux application can gradually increase the temperature of the PCB and activate the flux, which also reduces the thermal shock of the assembly as it enters the peak. It can also be used to evaporate all of the moisture that may be absorbed or the carrier solvent that dilutes the flux. If these things are not removed, they will boil over the peaks and cause solder to sputter, or steam will remain in the solder to form a hollow. Solder joints or blisters. In addition, since the double-panel and multi-layer boards have a large heat capacity, they require a higher preheating temperature than a single panel.

At present, the wave soldering machine basically uses the heat radiation method for preheating. The most commonly used wave soldering preheating methods include forced hot air convection, electric heating plate convection, electric heating rod heating and infrared heating. Among these methods, forced hot air convection is generally considered to be the most efficient heat transfer method for wave soldering machines in most processes. After preheating, the board is soldered with a single wave (λ wave) or a double wave (spoiler wave and lambda wave). For a perforated component, a single wave is sufficient. When the board enters the peak, the direction of solder flow is opposite to the direction of travel of the board, creating eddy currents around the component leads. This is like a scrubbing process that removes all of the flux and oxide film residues and forms a wetting when the solder joint reaches the wetting temperature.

For hybrid technology assemblies, spoiler waves are also typically used before the lambda wave. This wave is narrower and has a high vertical pressure during the disturbance, allowing the solder to penetrate well between the compact pins and the surface mount component (SMD) pads, and then the solder bumps are formed with lambda waves. . Before making any assessments of future equipment and suppliers, it is necessary to determine all the specifications of the board to be soldered with the peaks, as these can determine the performance of the required machine.

❙ Wave Soldering Machine