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Solder is a material that manufacturers use in the printed circuit board assembly process. This material can join soft metals such as gold, copper, and silver together. Copper is the common material in the printed circuit board assembly or any electronic item.

Most commonly, manufacturers will use eutectic solder, a combination of tin and lead. This solder is about 63% and 37% lead, and it comes with a formulation with a minimum melting point for the combination of metals.

Solder Properties

Different solders come with different melting points and ranges of temperatures where solid and liquid tend to co-exist together. You can also form a pasty substance as the solder cools, and you can find that the solder is very flexible. The flexible property or ductility of solder allows the metals that join to the solder to interpenetrate with one another once you melt the solder.

Solder is a dense and heavy material because it has a high lead content. It also comes in several different gauges and wire diameters. For surface mount devices, a very fine solder is more useful. You can also find lead-free solder, which comes with the formulation of tin, silver, and copper.

This does have a melting point, and you can use this commonly with electronics that use low-temperature soldering irons. Lead-free solder has a high melting point, which is why it can be difficult to work with. This material is also relatively new, and most people will be unfamiliar with its properties.

Printed Circuit Board Soldering

A printed circuit board holds electronic components and provides a mechanical means of holding them in a space where they connect electrically. A printed circuit board contains different resistors, active circuits, and capacitors.

The circuit board holds them together collectively and consists of several layers. The first layer you see is a green layer, a polymer called LPI. This photo image-able polymer can go down as a liquid and dry to form a solid layer. The green layer is necessary to prevent the solder from crossing over and shorting traces that should not connect.

Basic Soldering Technique

If you are manually soldering components to a printed circuit board, you must adhere to the basic soldering technique. There are two different types of soldering iron. One has a station that controls and adjusts the desired target temperature. The other melts electronics at a fixed temperature, which you can use similarly.

Soldering iron heat up and melt the solder on the circuit boards. When the solder melts and cools on the printed board surface, it cools and solidifies, fusing to the surface of the metal at a molecular level and enabling electrical conductivity within the two metal platforms.

When soldering with an iron, you can also use flux, which helps solder to flow, and also provides good contact by removing oxides on the surface of the metal. Although modern flux is not toxic, you should always use a fume extractor when soldering.

Two Different Connections

You can find two different soldering types, surface mount and through hole. Surface mount connections require manufacturers to heat components in an oven with pre-applied solder. This allows the solder to melt and join to the board’s surface. Through-hole soldering is when you push the components through the printed circuit board hole and solder them from the other side. The solder travels across the hole to make good contact.

Final Words

As you can see, soldering is an essential part of the printed circuit board assembly process. It is best to resort to a professional manufacturing unit to do a perfect job. The best soldering service will use top-notch technology for clean and precise solder.