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The difference between single wave soldering and double wave soldering

Time:2019-05-23   |   Source:   |   Compile :9

In electronics manufacturing companies, it is generally understood that wave soldering has the distinction between single wave soldering and double wave soldering. Single wave soldering has only one peak for soldering. Double wave soldering has two peaks for soldering. Single wave soldering is used to solder circuit boards with less dense solder joints. Double wave soldering can be used to solder circuit boards with SMD components. Double wave soldering has a turbulance and a smooth wave. The following is a detailed description of the difference between single wave soldering and double wave soldering.

  1. Single wave soldering.

It uses a tin pump to continuously melt the molten solder vertically upwards toward the narrow outlet to form a peak of 10 to 40 mm high. In this way, the solder acts on the PCB at a certain speed and pressure, and penetrates sufficiently between the component legs to be soldered and the PCB board to make it completely wet and soldered. Compared with dip soldering, it significantly reduces the rate of miss soldering. Due to the flexibility of the solder peaks, even if the PCB is not flat enough, as long as the warpage is below 3%, good solder quality can be obtained. The disadvantage of single-wave soldering is that the vertical peak force will cause impact on some lighter components, resulting in floating parts or solder joints. Due to the low cost of the equipment, the technology is mature in the domestic common perforated component (THD) welding has been widely used.

2.Double wave soldering

Because SMD does not have a mounting jack like THD, the flux volatilizes out of the gas when it is heated. In addition, SMD has a certain height and width, and is high-density mounting, and the solder surface has tension, so the solder is very It is difficult to infiltrate into every corner of the mounting component in time, so if single-wave soldering is used, a large amount of leakage welding and bridging will occur, and double wave soldering must be used to solve the above problem. Double wave soldering: There are two peaks before and after the tin furnace. The former one is narrower (the ratio of wave height to wave width is greater than 1). The peak end has 2-3 sweep b staggered small peaks, which are constantly flowing up and down in such a long position. Under the action of turbulent waves, the gas generated by the flux is removed, and the surface tension is also weakened, so that good welding is obtained. The latter peak is a wide-width wave in both directions, and the solder flow is flat and slow, which can remove excess solder and eliminate undesirable phenomena such as burrs and bridges.

Double wave can make good effect in SMD soldering, It has been widely used on PCBs with plug-in and hybrid methods. The disadvantage is that the PCB passes through two wave, and the amount of heat and deformation is large, which affects components and PCB boards.