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Analysis of PCB selective soldering technology


You will gain knowledge about selective soldering by reading this article. The technique known as selective soldering is used to attach components to printed circuit boards (PCBs) in a way that causes little or no harm. When precision is of the utmost importance or when working with components that are too small to be soldered using more conventional wave soldering methods, this technique is frequently used.

What is selective soldering?

Selective soldering refers to the process of soldering only certain joints or terminals on a PCB. There are two methods available for achieving this objective: manual labour and mechanical assistance. You can choose either one of them. When precision is of the utmost importance, selective soldering by hand is the way to go, while selective soldering by machine is better suited to mass production.
What-is-selective-solderingSelective soldering is used instead of wave soldering when the complexity or fragility of a circuit board necessitates a more cautious approach. It can also be used to solder on new components to an already-assembled circuit board, such as surface-mounted chips, or to make other repairs to an existing board.

To reduce the likelihood of damage, it is crucial to maintain tight control over the soldering process’s three main variables: temperature, pressure, and time. Selective soldering has the potential to provide high levels of precision and reliability if utilised properly. Additionally, production costs can be decreased by using this method as it is typically quicker than hand soldering and requires less specialised equipment.

What are the advantages and disadvantages of selective soldering?

Selective soldering has various applications and benefits. It’s more precise and accurate than hand soldering and can accommodate a wider range of component kinds and board sizes. Solder joints of a higher grade can be created with its help because of the precise temperature control and consistent outcomes.
advantages-and-disadvantages-of-selective-solderingFurthermore, selective soldering is more cost effective than manual soldering and has a smaller impact on the environment because less flux is utilised. In addition, it lessens the potential for component damage due to high temperatures and the likelihood of operator fatigue due to prolonged soldering cycles.

Selective soldering does have its drawbacks. More expensive equipment up-front expenses, complicated process and programming, longer cycle times, and questionable dependability due to possibly poor wetting are all disadvantages. Furthermore, close monitoring is required to ensure correct setup and reproducible outcomes. The use of heat and potentially dangerous fluxes present additional dangers to workers’ health when doing selective soldering. Therefore, the advantages and disadvantages of selective soldering must be carefully weighed.

What is selective soldering used for?

When soldering smaller components, this technique is ideal since it allows for exact positioning and eliminates overheating, which can harm delicate components. As a further benefit, it allows for more precise and efficient assembly of goods that feature several circuit boards and small-pitch components than is possible with manual soldering.

When compared to other automated soldering methods, such as wave soldering, selective soldering is preferable because it allows for greater process control and results in solder junctions of superior quality.

What is the selective soldering process?

The selective soldering process is a form of automated soldering that makes use of specialised tools to precisely deposit small amounts of solder on the electrical components of a circuit board. This helps to ensure that the circuit board functions correctly.

Because this approach uses a lower quantity of solder than others, it is particularly well-suited for usage with components that are readily harmed by high flux levels or heat, respectively.

The procedure of selective soldering not only increases the reliability of the solder joints, but it also lowers the risk of electrical shorts and eliminates other problems that are caused by excess solder.

What’s the difference between selective soldering and wave soldering?

Differentiating between wave soldering and selective soldering is an easy task. The entire board is submerged in solder during wave soldering. The term “selective soldering” refers to a method of soldering that is used to exclusively solder particular components to a printed circuit board. This can be accomplished by both human and mechanical means.
difference-between-selective-soldering-and-wave-solderingThe wave soldering method is used for larger boards with fewer components, whereas selective soldering is ideal for higher-density assemblies. More solder is used for fewer connections when soldering selectively.

When compared to wave soldering, selective soldering provides more customization possibilities for alloy, flux, and soldering temperature. Due to the necessity of special equipment for wave soldering. Only one kind of flux can be used with wave soldering. Unlike wave soldering, selective soldering can handle components with a wide range of shapes, sizes, and even heights. This benefit of selective soldering is not shared by wave soldering.

What are used when selective soldering?

A flux applicator, a preheater, a solder pot, and various positioning tools for the components are required in order to perform selective soldering. This type of soldering also requires the use of specific tools and apparatus. Because the soldering process needs to be watched and altered in order to provide quality results, it also necessitates the involvement of professional operators.
what-are-used-when-selective-solderingIn addition, the soldering process needs to be managed well in order to obtain consistent outcomes and reduce the likelihood of failures. This includes taking into consideration elements such as the size of the components, the form of their contact surfaces, as well as any other potential factors that may affect the soldering process.

In addition, a good flux management plan ought to be put into action in order to make the soldering process as effective as possible while also minimising the possibility of making errors.


We hope that after reading this article, you would have gained a lot of understanding about selective soldering process. For more blogs about PCBA, PCB, electronic components and devices, please visit our blog on IBE website.

If you are looking for a PCB design, PCB prototyping, and turnkey PCBA manufacturers, then IBE electronics will be a good choice. IBE has offered turnkey PCB assembly services in prototype quantities or low-volume to large-volume production runs for more than 17 years.

IBE has strong assembly ability-14 SMT lines,6 Dip lines,wave soldering process, 4 product assembly production workshop, Lab,and 75000㎡ factory. IBE has passed the audit and obtained many relevant certificates: ISO9001:2015, ISO14001, RoHS, and UL listed, World Class Quality and the Standards – IATF 16949:2016 Certified (for Automotive), ISO 13485:2016(for medical).

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