How to use a pointed soldering iron and tips on how to use it
Preparation
1. Before the use of new soldering iron, the application of fine sandpaper will be bright soldering iron head, electric heat, dipped in rosin with a soldering iron head edge contact solder wire, so that the soldering 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, use steel or iron cleaner to thwart the surface layer of oxides, so that it reveals a metallic luster, re-plated with tin, before use.
The soldering iron should be used with 220V AC power supply, and special attention should be paid to safety when using it. The following points should be done carefully:
It is better to use the three-pole plug of the soldering iron. Make the shell properly grounded.
Before use, the power plug, power cord should be carefully checked for damage. And check whether the soldering iron head is loose.
In the use of the soldering iron, it should not be knocked hard. To prevent falling. When there is too much solder on the head of the soldering iron, it can be wiped off with a cloth. Do not fling it around to prevent burning others.
Soldering process, the soldering iron can not be placed everywhere. When not soldering, it should be placed on the soldering iron stand. Pay attention to the power cord can not ride on the iron head, in order to prevent scalding insulation and accidents.
After the use of the end, should promptly cut off the power supply, unplug the power plug. 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.
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, pliers, tweezers, knife
Pre-soldering treatment
Before welding, should be component pins or circuit board welding parts of the pre-soldering treatment.
1, remove the oxidized layer of the welding parts
Broken saw blade can be made into a 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 lead 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 it is a multi-stranded wire leads, lightening should be screwed together first, and then tinned.
Scrape off the oxide layer evenly plated with a layer of tin
Welding technology
After doing a good job of pre-welding treatment, you can formally carry out welding.
1, welding method.
Welding Check Cutting
(1) the right hand holding a soldering iron. 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.
2, welding quality
When welding, make sure that each soldering point is firmly welded and has good contact. To ensure the quality of welding.
Good solder joints should be tin point bright, round and smooth without burrs, the amount of tin is moderate. The tin and the soldered material are firmly fused. There should be no false soldering and fake soldering.
