Electric iron selection
Soldering irons are the most commonly used welding tools in wire harness related welding operations. Its function is to convert electric energy into heat energy to heat weld the welding point. A big part of its success is how to control it. Therefore, the use of electric iron depends on a kind of manipulation feeling from a certain angle.
In general, the choice of soldering iron is the choice of power for the soldering iron. The power of the soldering iron should be determined by the size of the solder joint. The area of ​​the solder joint is large, and the heat dissipation speed of the solder joint is also fast, so the power of the soldering iron should be larger.
40W: suitable for mobile phones, MP3, small fighter game controllers, handheld game consoles, etc.
Introduction
External thermal soldering iron: Named for the heating resistor outside the soldering iron. It is suitable for welding large parts as well as for soldering small components. Since the heating resistance wire is outside the soldering iron tip, most of the heat is radiated to the external space, so the heating efficiency is low, the heating speed is slow, and it is generally preheated for 6 to 7 minutes to be welded. Its large size makes it inconvenient to solder small devices. But it has the advantage that the tip is used for a long time and the power is large.
Method of use, also maintenance method
1. The soldering iron should be tinned before use. The specific method is: heat the soldering iron. When the solder can be melted, apply flux, and then evenly spread the soldering iron on the soldering iron to make the soldering iron evenly eat. A layer of tin.
2. Soldering method: Dip a proper amount of solder with a soldering iron tip, contact the solder joint, and after the solder on the solder joint is completely melted and immersed in the component lead head, the soldering iron tip is gently lifted up along the lead of the component. point.
3, the welding time should not be too long, otherwise it is easy to burn the components, if necessary, the tweezers can be used to clamp the pins to help dissipate heat.
4, the solder joint should be sinusoidal peak shape, the surface should be bright and smooth, no tin thorn, moderate amount of tin.
5. After the welding is completed, the residual flux on the circuit board should be cleaned with alcohol to prevent the flux after the carbonization from affecting the normal operation of the circuit.
6. The integrated circuit should be soldered at the end, the soldering iron should be grounded reliably, or the residual heat should be used after the power is turned off. Or use an integrated circuit socket, solder the socket and then plug the integrated circuit.
7. The soldering iron should be placed on the soldering iron frame.
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