How to use the electric soldering iron--preparation work
1. Before using a new soldering iron, use fine sandpaper to polish the tip of the soldering iron, heat it up with electricity, dip it in rosin, and touch the solder wire with the blade of the tip of the soldering iron, so that the tip of the soldering iron is evenly coated with a layer of tin, which can facilitate welding and welding. Prevent oxidation on the surface of the soldering iron tip. If the old soldering iron tip is severely oxidized and blackened, the surface oxide can be removed with steel foil to expose the metallic luster and then re-tinned before use.
The electric soldering iron should use 220V AC power supply, and special attention should be paid to safety when using it. The following points should be carefully done:
It is best to use a three-pole plug for the soldering iron plug, and the shell must be properly grounded.
Before use, carefully check whether the power plug and power cord are damaged, and check whether the tip of the soldering iron is loose.
The electric soldering iron should not be tapped hard during use, and it must be prevented from falling. If there is too much solder on the soldering iron tip, it can be wiped off with a cloth, and it should not be thrown around to prevent others from being burned.
During the soldering process, the soldering iron should not be placed anywhere, and should be placed on the soldering iron stand when not soldering. Be careful not to put the power cord on the tip of the soldering iron to prevent accidents caused by scalding the insulation layer.
After use, the power should be cut off in time, unplug the power plug to cool down, and then put the soldering iron back into the toolbox.
2. Solder and flux
When soldering, solder and flux are also required.
Solder: Solder wire with rosin core is generally used for soldering electronic components. This kind of solder wire has a low melting point and contains rosin flux, which is extremely convenient to use.
Flux: The commonly used flux is rosin or rosin water (dissolve rosin in alcohol). The use of flux can help remove oxides on the metal surface, which is beneficial to welding and can protect the tip of the soldering iron. Solder paste can also be used when welding larger components or wires, but it is corrosive to a certain extent, and the residue should be removed in time after welding.
3. Auxiliary tools
In order to facilitate the welding operation, needle-nose pliers, partial-nose pliers, tweezers and knives are often used as auxiliary tools, and you should learn to use these tools correctly. Needle-nose pliers, partial-nose pliers, tweezers, knife.
How to use electric soldering iron -- pre-soldering treatment
Before soldering, pre-soldering treatment should be performed on the component pins or the soldering parts of the circuit board:
Remove the oxide layer on the welding part
A knife can be made from a broken saw blade to scrape off the oxide layer on the surface of the metal lead to expose the metal luster of the lead.
The printed circuit board can be polished with fine gauze paper and then coated with a layer of rosin alcohol solution.
Component tin plating
Tin on scraped leads. After dipping the lead wire in the rosin alcohol solution, press the tinned hot soldering iron tip on the lead wire and turn the lead wire. It can make the lead wire evenly coated with a very thin layer of tin layer. Before welding the wire, the insulation sheath should be stripped off, and then the above two treatments can be done before formal welding. If the wire is multi-strand wire, it should be Screwed together first, then tinned. Scrape off the oxide layer and evenly plate a layer of tin.
