Soldering tips for beginner


Welding technology is a basic skill that every electronic enthusiast must master. Now let's introduce the important main points of welding:

  1. Soldering iron

    The power of the electric soldering iron should be determined by the size of the welding point. The larger the solder joint area, the faster the heat dissipation, so the power of the electric soldering iron should be larger accordingly. The general power of the soldering iron is 20W 25W 30W 35W 50W, etc. After the soldering iron is used for a long time, a layer of oxidation will be formed on the tip of the soldering iron. Tips with oxidation will tend to turn black and not accept solder as it did when it was new. You can use a traditional wet sponge, but due to expansion and contraction, this tends to shorten the life of the tip. In addition, the wet sponge will temporarily reduce the temperature of the tip when wiping. A better option is to use brass spongeas shown in the picture below.2. Solder wire

      Use low melting point solder wire and non-corrosive flux, such as rosin. Industrial solder and corrosive acid soldering oil are not suitable as this will damage your circuits and components. For electronic soldering, the most common type is lead-free rosin cored solder.


      1. Welding method

      The components must be cleaned and tin-plated. When the electronic components are stored, due to the effect of air oxidation, there is an oxide film on the component pins, and there are other dirt. You can scrape off the oxide film with a knife before soldering and apply a layer immediately solder tin, and then solder. After the above treatment, the components are easy to be welded firmly, so that the non-wetting rarely occurs.

      The soldering temperature and soldering time should make the temperature of the soldering iron higher than the temperature of the soldering tin, but not too high. It is better that the soldering iron tip touches the rosin and just smokes. If the soldering time is too short, the temperature of the solder joint will be low, which will lead to insufficient melting of the solder joint, rough solder joints, and easy to cause cold welding. On the contrary, if the soldering time is too long, the solder is easy to flow, and it is easy to overheat the components and damage the components.

      The amount of solder on the solder joint should not be too little or too much. The solder should just immerse all the component pins on the solder joint and the outline should be faintly visible.

      Pay attention to the position of the iron and the welding point. When beginners are welding, they generally move the electric iron back and forth in the welding place or squeeze it hard. This method is wrong.The correct method is to contact the welding point with the tin surface of the electric iron, so that the heat transfer area is large and the welding speed is fast.

      1. Checking

      After soldering, check for missing soldering, cold soldering, and component short circuit caused by solder flow. Cold welding is difficult to find, you can use tweezers to grip the component pin and gently pull it, if there is sharking, it should be repaired immediately.


      ★Before each soldering operation, wipe with a wet sponge to remove oxides and dirty on the tip of the soldering iron. Be careful not to use too much force, and avoid splashes of residue, scalding people or scalding materials.

      ★The soldering iron tip should be coated with a layer of solder before use.

      ★The soldering iron should not be air-heated for a long time during use, so as not to burn the tip and core of the soldering iron.

      ★When the soldering iron is not in use or temporarily not in use, the tip of the soldering iron should be dipped in tin and placed on the soldering iron stand to protect the soldering iron and personnel safety.

      ★If the soldering iron tip has been damaged or deformed or pinholes appear, stop using it to avoid damage to the soldered object.

      ★When the soldering iron is not in use, turn off the power and unplug it to avoid scalding others.

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