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PCB Board Soldering Principles and Required Tools

PCB board soldering technology mainly uses tin lead solder for soldering, referred to as tin soldering.


I. Welding principles of PCB board soldering:


In the process of soldering, under the action of welding heat, the weldment and copper foil do not melt. The solder melts and moistens the welding surface, which results in the diffusion of metals and the formation of a metal alloy layer between the copper foil and the weldment by the movement of atoms and molecules between weldment and copper foil. The copper foil is connected with the weldment to obtain a firm and reliable welding point.


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II. Tools of PCB board soldering


1. Electric soldering iron

Electric soldering iron is the most important welding tool in pcb board soldering. Different electric irons have different structures. The external heated electric soldering iron is generally composed of a soldering head, a soldering iron core, a shell, a handle and a plug. The soldering iron head is installed in the iron core and is made of copper alloy material with good thermal conductivity as the matrix. The internal heated electric soldering iron is composed of connecting rod, handle, spring clip, iron core and iron head. The soldering iron core is installed in the head of the soldering iron (with fast heating and high thermal efficiency of 85% - 90%). There are many kinds of electric irons, including direct heating, induction, energy storage and temperature regulation. According to the power, it can be divided into 15W, 20W, 35W and so on.


2. Tin and flux

Tin: it is a kind of fusible metal. It connects the component lead and the connection point of the printed circuit board.


Flux: divided into flux and solder resist. Flux can remove oxide from metal surface. When welding, the solder resist can protect the panel from the impact of heating, so that it is not easy to blister.


3. Assistive tools

In order to facilitate pcb board soldering, we also need some auxiliary tools, such as pointed nose pliers, side cutters, tweezers and knives. These tools can help us to cut component pins, and some can help us detect the firmness of welding. These auxiliary tools are also indispensable tools for us in soldering.

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