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      Position:Home > Common problem

      How to avoid the automatic soldering machine.

      Source:未知 Sentiment:Published time:2016-10-09

        Weld is only a small amount of solder joints, causing poor contact, when the broken. Refers to the weld welding surface is not fully plated on the tin layer, welding between tin is not solid, because the welding surface no clean flux or too little and the welding time is too short to cause. The so-called "joint late failure", refers to the surface seems on the weld quality is acceptable, not the existence of a "welding", "no welding" and "tip", "copper exposed" welding defects in the workshop production, as there is nothing wrong with the machine, but to the user after a period of time, because poor welding, electrical conductivity difference caused by the fault has occurred, resulting in early repair rate is one of the reasons for high, this is the "". Good joint will seriously affect the overall quality of the potentiometer, must be careful not to produce. Here we will discuss how to control the production in the production process of Xuhan phenomenon.

        1, regular cleaning, and keep the head clean iron. Because the electric automatic soldering machine head long iron at high temperature, the surface is easily oxidized or burned, the iron head conductivity variation and the influence of welding quality. Therefore, can be used wet or wet sponge to wipe the impurities on the soldering iron head, high temperature, cooling can be temporarily pulled the plug or with rosin, the iron head hung tin always good.

        2, on the tin attention: if the welding parts and solder joint surface with rust stains, dirt or oxides, should be cleaned before welding, in order to solder or solder joint surface plating tin. Automatic soldering machine

        3, welding temperature should be appropriate, can not be too high, can not be too low. In order to make the temperature appropriate, should be based on the size of the electronic components of the appropriate choice of power automatic soldering machine, when the choice of automatic solder machine power, should pay attention to control the length of heating time. When the soldering iron head automatically from scattered to be welded when the heating time has enough. This quickly remove the iron head, by welding place leave a sleek. If you remove the automatic soldering machine, welding is a tin does not stay or leave a little, the heating time is too short, the temperature is not enough or too dirty to be welded; if removed automatic soldering machine, the solder will flow down, it shows that the heating time is too long, the temperature is too high. General iron head temperature control of welding temperature is the best in the flux melting faster do not smoke when.

        4, the amount of tin to moderate. It can be based on the size of the solder joint to determine the amount of solder dipped in the automatic solder machine, so that the solder is enough to wrap up to be welded to form a suitable size and smooth solder. Not much, tin tin solder is good, on the contrary, the possibility of joints weld more likely solder stacked on top instead of welding in the above. If a tin is not enough, can again repair welding, but subject to the previous tin after being melted and removed together with the automatic soldering machine; if a tin is too much, take the amount of available iron head.

        5, welding time to control, not too long. The proper use of welding time is also an important part of welding technology. If it is printed circuit board welding, generally to 2 ~ 3S is appropriate. The welding time is too long, the solder flux evaporate completely, lost flux, solder joint surface oxidation, surface roughness, cause solder black, not bright, with burrs or flow defects. At the same time, the welding time is too long, the temperature is too high, but also easy to burn the components or printed circuit board copper foil. If the welding time is too short to reach the welding temperature, solder is not fully melted, the wetting effect of flux, easy to cause.

        6, welding point of solidification process, remember not to use the hand to touch the welding point. The welding point is not solidified completely before, even if there is a small vibration may cause deformation caused by weld joints. Therefore, in the iron head of welding parts to be evacuated before fixation, such as tweezers clamping, or after the iron head retreat quickly with the mouth, take the purpose of these practices is to shorten the solidification time of solder joint.

        7, when a welding point welding, selection of welding head angle is also particularly important to evacuate. When the iron head along the inclined upper part of the evacuation, take a small amount of solder iron head, it can form a smooth solder joint; when the iron head vertical evacuation, can form a sharp pull solder burr; when the withdrawal of the iron head in the horizontal direction, the iron head can take away the ball.

        To sum up, to avoid weld of the most direct and most fundamental, is to do the cleanup work before welding, cleaning it is best not to use the solder paste, because it contains acidic materials, likely will corrode electronic components pin, causing. Clean up after welding to surface oxide, the first tin welding is easy, not easy to produce. It should be hung on the tin pin in electronic components, and a good grasp of the welding time, so as to ensure the quality of the soldering quality, thereby protecting the entire circuit board.

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