About Soldering
Soldering can be defined as merging two metals using an alloy metal with a low melting point. For a good-quality soldering; a good soldering iron and a good flux are required.
![solder wire](https://www.rootgsm.com/wp-content/uploads/2022/01/solder-wire.jpg)
Soldering is done for two purposes; Electronic device manufacturing and assembly
- Electronic device repair;
- Cold soldering removal
- Changing components for repair purposes
There are two types of solderings by the structure of the alloy.
1-) Leaded solder: Solder, consists of certain mixed amounts of lead and tin. The ideal ratio of lead and tin is; %60 tin, %40 lead. Solders with %63 tin, %37 lead ratios are also used.
2-) Lead-free solder: Lead-free solder wire consists of %95.5 SN (tin), %3.8 Ag (silver), %0.7 Cu (copper).
Lead-free solder melts longer and at higher temperatures than leaded solder. Therefore, more suitable soldering iron tips and solder should be used for lead-free soldering.
Most of the malfunctions of electronic devices are caused by cold soldering. Cold solders are electrically bad connections and cause malfunctions by preventing your circuit from working properly.
![Soldering](https://www.rootgsm.com/wp-content/uploads/2022/01/Soldering-mainboard.jpg)
In mobile phones and other mobile devices, when the contact of the soldered surfaces (mainboard and elements) in the usage process weakens due to impact, falling, contraction, etc., short-term or permanent malfunctions occur in the devices. By gently hitting the PCB or even bending the board a little, we can understand if there is a cold soldering.
Cold solder can be easily recognized by its granular appearance and non-glossy gray color. To fix a cold solder, the old solder must first be removed. Lead-free solder appears matte, not to be confused with cold solder.
In order to solder well, we must first learn how to solder by getting training from a knowledgeable and experienced person. We should improve our technique by practicing a lot under the supervision of someone who knows how to solder.
Although soldering may seem simple, soldering is a specialist job. Soldering is a must-know skill for any electronics repair technician.
Did you see this article – General Concepts to Know for Mobile Phone Repair