By choosing a suitable electric soldering iron, we can only ensure the efficient development of the welding process. Here is a list of general recommendations for choosing an electric soldering iron, as well as considerations for power. Take a look at it with me.
Electric soldering irons come in three different general categories.
1. The shape of the tip of the soldering iron can adapt to the surface requirements of the workpiece to be welded and the assembly density of the product.
2. The temperature of the tip of the soldering iron tip needs to be compatible with the melting point of the solder, generally 30-80°C higher than the melting point of the solder (excluding the temperature that drops when the soldering iron tip contacts the soldering point).
3. The heat capacity of the electric soldering iron should be appropriate, and the temperature recovery time of the soldering iron tip should be adapted to the requirements of the object surface to be welded.
The temperature recovery time refers to the time required for the temperature of the tip of the soldering iron to return to the highest temperature after the temperature of the tip of the soldering iron decreases due to heat loss during the welding cycle. It is related to the power and heat capacity of the soldering iron, as well as the shape and length of the soldering iron tip.
The power principle of choosing electric soldering iron
1. When soldering integrated circuits, transistors and other components that are subject to heat, consider using a 20W internal heating or 25W external heating soldering iron.
2. When welding thicker wires and coaxial cables, consider using a 50W internal heating type or a 45-75W external heating type electric soldering iron.
3. When welding larger components, such as metal chassis grounding pads, an electric soldering iron with a power of more than 100W should be selected.
Summarize:
The larger the soldering iron tip, the larger the heat capacity. When continuous welding, the larger the soldering iron tip is, the less the temperature drop will be.
The large soldering iron tip has a high heat capacity, and a lower temperature can be used during soldering, the soldering iron tip is not easy to oxidize, and the service life of the soldering iron tip can be extended.
A soldering iron tip with a contact area between the soldering iron tip and the solder joint. The large contact area can produce effective heat transfer. The size of the soldering iron tip is based on the standard that does not affect adjacent components. Selecting a geometry that provides sufficient contact with the solder joint can improve soldering efficiency.
There are various shapes of soldering iron tips. The main points of selection are: always maintain a certain amount of solder, quickly and effectively melt the solder on the joint, without false soldering, tinning, hanging tin, no burr in the solder joint, and no scalding of the board and components.
