Soldering iron soldering wire method
Before the use of new soldering iron, the application of fine sandpaper to the iron head light bright, electrified hot, dipped in rosin with a soldering iron head edge contact solder wire, so that the iron head evenly coated with a layer of tin. This can facilitate welding and prevent the surface of the soldering iron head oxidation. If the old iron head is seriously oxidized and blackened, can be used to remove the surface layer of oxides, so that it reveals the luster of the metal, re-plated with tin, in order to use!
The soldering iron should be used with 220V AC power supply, and special attention should be paid to safety when using it. Should seriously do the following points:
(1) The soldering iron plug is best to use three-pole plug. To make the shell properly grounded.
(2) Before use, should carefully check the power plug, power cord for damage. And check whether the soldering iron head is loose.
(3) In the use of the soldering iron, it should not be struck with force. To prevent falling. When there is too much solder on the head of the soldering iron, wipe it off with a cloth. Do not fling it around to prevent burning others.
(4) soldering process, the soldering iron can not be placed everywhere. When not welding, should be placed on the soldering iron stand. Note that the power cord must not be hitched to the head of the soldering iron, in order to prevent scalding the insulation layer and accidents.
(5) After the use of the end, should be timely cut off the power supply, unplugged. After cooling, then the soldering iron back to the tool box.
2, solder and flux
Welding, but also need to solder and flux.
(1) solder: welding electronic components, generally used with rosin core of the solder wire. This wire, low melting point, and contains rosin flux, extremely convenient to use.
(2) Flux: Commonly used fluxes are rosin or rosin water (rosin dissolved in alcohol). The use of flux, can help remove the oxides on the surface of the metal, conducive to welding, but also to protect the soldering iron tip. Solder paste can also be used when soldering larger components or wires. But it has a certain corrosive, welding should be promptly removed after the residue.
3, auxiliary tools
In order to facilitate the welding operation often use sharp-nosed pliers, pliers, tweezers and knives as auxiliary tools. Should learn to use these tools correctly.
Sharp-nosed pliers offset pliers tweezers knife
Pre-soldering treatment
Before welding, the component pins or circuit board should be welded parts of the pre-soldering treatment.
1, remove the oxidized layer of the welding parts
Available broken saw blade made of knife. Scrape the surface of the metal lead oxide layer, so that the pins reveal the metal luster.
Printed circuit boards can be used fine gauze paper to lighten the copper foil, coated with a layer of rosin alcohol solution.
2, component tinning
In the scraping of the net lead on the tin. Leads can be dipped in rosin alcohol solution, the hot soldering iron with tin head pressure on the lead, and turn the lead. Can make the leads evenly plated with a very thin layer of tin. Before welding the leads, the insulation should be stripped off the outer skin, and then after the above two treatments, before the formal welding. If the wire is a multi-stranded wire, the lightening should be screwed together first, and then tinned, scraping the oxidized layer evenly plated with a layer of tin.
Welding technology
After doing the pre-welding treatment, you can formally carry out welding.
1, welding method.
Welding check cut short
(1) Hold the soldering iron in the right hand. The left hand with sharp-nosed pliers or tweezers holding components or wires. Before welding, the soldering iron should be fully preheated. The soldering iron head edge surface to eat tin, that is, with a certain amount of solder.
(2) Place the tip of the soldering iron firmly against the soldering point. The soldering iron and the horizontal plane at an angle of about 60 ℃. So as to facilitate the flow of melted tin from the soldering iron head to the soldering point. The time that the soldering iron tip stays at the soldering point is controlled at 2 to 3 seconds.
(3) Lift off the soldering iron tip. The left hand is still holding the component does not move. Wait until the tin at the solder joint cools and solidifies before releasing the left hand.
(4) Use tweezers to rotate the lead, to confirm that it is not loose, and then available bias pliers to cut off the excess lead.
