The difference between selective wave soldering and manual soldering in PCBA processing

In PCBA processing, there are two processing methods: selective wave soldering and manual soldering for plug-in materials. What are the differences between these two soldering methods, and what are the advantages and disadvantages of each?

1. Welding quality
From the point of view of soldering quality, selective wave soldering is definitely better than manual soldering. Although the quality of manual soldering has been improved due to the application of high-quality intelligent soldering irons, there are still some factors that are difficult to control. For example, the control of the amount of solder in the solder joints and the wetting angle of the solder, the control of soldering consistency, and the requirements for the tin-through rate of the metallized holes, etc. Especially when the component leads are gold-plated, it is necessary to remove gold and enamel tin before soldering on the parts that need to be soldered. This is a very troublesome thing.

Manual soldering also has human factors and other disadvantages, which make it difficult to meet high-quality requirements; for example, as the density of circuit boards increases and the thickness of the circuit board increases, the soldering heat capacity increases, and soldering iron soldering can easily lead to insufficient heat and form false soldering. Or the through-hole solder climbing height does not meet the requirements. If the soldering temperature is increased excessively or the soldering time is prolonged, it is easy to damage the PCBA manufacturing and cause the pad to fall off.

2. Welding efficiency
Traditional manual soldering iron soldering requires many people to use point-to-point soldering on the PCB. Selective wave soldering uses an assembly-line industrial batch production mode. Welding nozzles of different sizes can be soldered in batches by drag welding. Usually, the welding efficiency is several tens of times higher than that of manual welding.

3. Welding flexibility
Selective wave soldering uses a programmable and movable small tin cylinder and a variety of flexible soldering nozzles, so it can be programmed to avoid certain fixing screws and ribs on the B side of the PCB during soldering. In order to avoid damage caused by contact with high-temperature solder, there is no need to use custom welding trays and other methods; therefore, it is very suitable for multi-variety, small-batch production methods, especially in the aerospace and military fields, and has a very broad application prospect!
4. The high quality of selective wave soldering
When using selective wave soldering for soldering, the welding parameters of each solder joint can be "tailored", and there is enough process adjustment space to adjust the welding conditions of each solder joint, such as the amount of flux sprayed, welding time, and welding The wave height and wave height are adjusted to the best, the defect rate can be greatly reduced, and it is even possible to achieve zero defect soldering of through-hole components. Compared with manual soldering, through-hole reflow soldering and traditional wave soldering, the defect rate of selective wave soldering (DPM) is the lowest.

From the comparison between selective wave soldering and manual soldering, we can see that selective wave soldering has many advantages such as good soldering quality, high efficiency, strong flexibility, low defect rate, less pollution, and the diversity of soldering components. PCBA soldering of high-reliability electronic products is always the best choice to replace manual soldering.

POE is an electronic processing company specializing in SMT chip processing, DIP common processing, PCBA package labor and materials, quick turn PCB Assembly and PCB circuit board manufacturing. It has many years of electronic processing experience, as well as advanced production equipment and a complete after-sales service system. The company's SMT chip processing capacity reaches 4 million pieces per day, and the DIP plug-in processing capacity is 400,000 pieces per day, which can provide you with high-quality electronic processing services.