PCB Soldering Process

Dated:2017-10-23      Popularity:1110

PCB soldering is very important which is widely used from PCB assembly to BGA placement, cable assembly to SMT assembly.

PCB Soldering

Soldering is the process of connecting two or more items (usually metal, but not always) by melting and putting the filler metal in the joint. If you think it sounds like welding, you will not be wrong, because the two processes are very similar. Unlike welding, soldering does not involve melting work pieces, which is why soldering is more suitable for smaller and more complex work like making a circuit board.

Soldering helps us connect electrical wiring to electronic components, which is the key to ensuring the functionality of printed circuit boards. 

This article aims to summarize the basics so that you can learn the art of soldering techniques. The following information is useful for green hands.

PCB Tools
No matter what type of soldering work you are doing, you need to use a soldering iron and some solder to get started. A soldering iron between 25W and 30W is recommended for minor electronic work. The solder you use should be rosin core, which can be easily found.

Proper tool preparation is one of the most important steps of soldering, otherwise it may waste lots of time. Grease, oxidation and all other forms of contamination need to be wiped off from the tool, otherwise you will solve globules of molten solder, which may lead to bonding and appearance problems. Many beginners will make the mistake of overheating the components because they think it will help the solder to stick. However, this actually has the opposite effect, and may even lead to irreversible damage.

PCB Tin Plating
Tin plating is the process of coating or filling wires with solder, so they can be melted together. This is a subtle procedure requiring a steady hand, otherwise it will cause a weak joint.

Apply Heat and Solder
Before heating and soldering components, you should remember that the purpose of the soldering iron is to provide heat instead of shaping a joint. The solder will naturally flow, so there is no need to shape it yourself. Once components are heated, solder can be used. It takes only one to two seconds to fully heat components, and you should make a joint at that moment. Do not move the newly formed joint until the solder has cooled down and become solid. Moving joints at this time will cause the formation of  cold joints or weak joints, which will lead to poor electrical connections and may prevent the circuit from working properly.

pcb soldering iron

Clean Up
Clean tip up to keep your equipment in good condition and make sure you can reuse it. After soldering each joint, you need to clean the tip of your soldering iron. We use special equipment for this, but for a novice, the wet sponge is enough. If there is excess solder on the board (usually a little bit), you need to use a solder wick to remove it. 

PCB solder wick

PCB Soldering  

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