What are the principles for selecting electric soldering irons
Only by selecting a suitable electric soldering iron can welding work proceed smoothly. Here is a summary of the general principles when selecting electric soldering irons, as well as the power principles to consider when selecting electric soldering irons. Let's take a look together.
General principles for selecting electric soldering irons
1. The shape of the soldering iron head can adapt to the surface requirements of the welded part and the assembly density of the product.
2. The top temperature of the soldering iron head needs to be adapted to the melting point of the solder, usually 30-80 ℃ higher than the melting point of the solder (excluding the temperature that drops when the electric soldering iron head contacts the welding point).
3. The heat capacity of the electric soldering iron should be appropriate, and the temperature recovery time of the soldering iron head needs to be adapted to the requirements of the surface of the welded part.
The temperature recovery time refers to the time required for the top temperature of the soldering iron to decrease due to heat dissipation during the welding cycle and then recover to the highest temperature. It is related to the power and heat capacity of the electric soldering iron, as well as the shape and length of the soldering iron head.
The principle of selecting the power of an electric soldering iron
1. When welding components such as integrated circuits, transistors, and other vulnerable parts to heat, consider using a 20W internally heated or 25W externally heated soldering iron.
2. When welding thicker wires and coaxial cables, consider using a 50W internally heated or 45-75W externally heated electric soldering iron.
3. When welding larger components, such as metal chassis grounding pads, an electric soldering iron of over 100W should be selected.
Summary:
The larger the soldering iron head, the relatively larger the heat capacity. When conducting continuous welding, using a larger soldering iron head results in less temperature drop.
The large soldering iron head has a high heat capacity and can be welded at a lower temperature, making it less prone to oxidation and extending the service life of the soldering iron head.
A soldering iron head with a contact area between the soldering point and the soldering iron head. A large contact area can generate effective heat transfer, and the size of the soldering iron head is based on not affecting adjacent components. Choosing a geometric size that can fully contact the solder joint can improve welding efficiency.
There are various shapes of soldering iron heads, and the key points to choose are: to regularly maintain a certain amount of solder, quickly and effectively melt the solder on the joint, without false soldering, overlap or hanging solder, without burrs on the solder joints, and without burning the board and components.
