Why Need Selective Wave Soldering

Why Need Selective Wave Soldering

1、 Principle comparison

Selective wave soldering is a local welding technology, which only weld the pins of components that need to be welded by forming wave peaks in a specific area. This welding method has high flexibility and precision, and can achieve efficient welding of a single or a small number of components.

In contrast, wave peak welding is a global welding technique. During the welding process, circuit board will be immersed into the molten solder, and through the impact force and wetting of the solder wave, the solder will be evenly coated on the pin of the components to be welded. This method is suitable for large-batch, high-density welding requirements.

The fundamental difference between selecting wave soldering and ordinary wave soldering. Ordinary wave soldering is to climb the contact of the whole circuit board and the tin spray surface by the surface tension of the solder. For large heat capacity and multi-layer circuit board, this wave soldering is difficult to meet the requirements of tin penetration. The selective wave soldering is different, the welding nozzle is rushed out of the dynamic tin wave, its dynamic strength will directly affect the vertical tin permeability in the through hole;

2、 Application comparison

Selective wave soldering, due to its flexibility and accuracy, is particularly suitable for the following scenarios: high mixing degree, small batch production of circuit boards; components with high requirements for welding quality; and welding of heat-sensitive or vulnerable components. This welding method can effectively avoid the thermal impact on the surrounding components, and improve the welding quality and reliability.

Ordinary wave soldering is more suitable for large batch, high density circuit board production. Its welding efficiency is high and can meet the demand of rapid production. At the same time, due to the impact force and wetting of solder crest, wave soldering can achieve better welding effect and high hole filling rate.

3、 Characteristics of comparison

The advantages of selective wave soldering lie in its high flexibility and accuracy, as well as the low thermal impact on the surrounding components. This gives it a significant advantage in handling complex circuit boards and components.

Selective wave soldering in spraying flux can be done only for the solder position, so not only save the use of flux, but also greatly reduce the solder residues, and because when welding only welding position contact with solder, so not only save the amount of tin, but also can reduce the occurrence of solder dross phenomenon, in addition to the volume of selective wave soldering machine is small and does not take up much space, and itself with operation desk, can adapt to various shapes of PCB , so also save the cost of all kinds of fixtures.

The advantages of ordinary wave soldering are its high efficiency and high hole filling rate, especially suitable for large batch and high density circuit board production. In addition, the equipment costs and maintenance costs of wave wave soldering are relatively low, which makes it have an advantage in cost control.


Selective and wave soldering have significant differences in principle, application and advantages and disadvantages. In practical application, the most suitable welding method should be selected according to the factors such as production demand and cost budget.

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