First, the welding principle
At present, welding of electronic components mainly uses welding technology. The welding technology uses tin soldered with tin alloy material to melt and weld at a certain temperature, metal atoms and tin attract each other, and the diffusion layer combines and penetrates. The appearance of the copper wire and the components are very smooth, they actually have a lot of tiny surface melt flow, the unevenness of the solder joint surface diffusion, through the formation of capillary suction and solder, composition and printed board tightly combined And has good electrical conductivity.
The soldering conditions are as follows: the soldering surface should be clean, the grease stain, the soldering, the solderable wet metal solderability, the brass surface oxide film material production, can help the soldering flux, the surface is soldered, and after the invasion, there must be The proper temperature makes the welding material have a certain fluidity, which can achieve this goal, but the welding temperature is too high, and it is not easy to form and weld the quality of the oxide film.
Second, hand tools or welding
The main tools are hand soldering. There are many types, or hydrothermal type, inductive straight line, energy storage type and tempering power, 2OW type bridge, 15W..., mainly to determine 300W various welding according to size. In 2OW general component soldering or undesirable transmission, integrated circuits and delicate soldered parts can be used or stored in energy, when welding a large one ~300W power can be WaiReShi or. Small power or iron between 300-400 degrees Celsius, head temperature.
The head of iron-copper material is commonly used. In the case of soldering temperature conditions, the protection is not oxidative rust, often by electroplating, and the iron head head is also used for the oxidation resistance of some iron alloy materials. Tin should be treated before the official new iron head welding. Method: The iron head is made of fine gauze, then immersed in clean water, and the person who welds the rosin on the boat (for example, the iron grinding head repeats the can of each face. If it is used for a long time, the iron oxide head has already occurred, using small The light to the surface of the oxide layer, the light in the new method of displaying copper and iron head. When using the only method that can be iron or head into the iron core with different temperature adjustment of the iron. From the iron core iron The head is long and the temperature of the iron is higher. The temperature is relatively lower. The shape and size of the condition can also be used to adjust the temperature. The higher the temperature of the tip, the higher the iron, the lower the temperature relative to the tip.
Depending on the type of element, an iron of the shape of a suitable weld head can be selected. The head type and beveled iron cone at the top have an elliptical shape, a chisel shape, and the like. Small cylindrical solder joints and welded joints can be used with large cylindrical shapes or cuts.
And a can or inhalation, direct heating or increase the adsorption mechanism. In the case of a circuit component, the split or the original should be used.
Third, welding materials and flux
The main components are soldered. Soldering electronic components is actually a solder alloy. The melting temperature of lead in different lead-tin solders is different, usually between 180 ° and 230 USD. It is most suitable for hand-welded steel pipe welding line. The line is excellent with rosin and catalyst in the middle, which is very convenient to use. Tubular solder wire is 0.5 to 1.5 0.8, 1.0, ... a variety of specifications, easy.
Flow and flow are a welding process that can heat metal surface cleaning and protective materials. The oxide film that is easily generated by air on the metal surface prevents the oxide film from penetrating and welding the weld metal. Proper use of flux removes oxide film, provides a more reliable, smoother, rounded solder surface.
Magnetic flocculant and organic series are inorganic series and three kinds of rosin series and inorganic materials, but the most active metals are corrosive and electronic components, and should not be used for welding. Organic acid flux (such as glue), also has a mild positive resistance. The most widely used is rosin flux. The rosin "water" that will be melted into alcohol (1), when the rosin in the solder joints is drowned with water, can achieve good soldering effect with the help of rosin. Too much dosage form, solder or multiple film rosin is lost to help clean the weld after welding. Soldering hard solder rosin in metal parts can add about 4% hydrochloric acid alcohol to two or three rubber adhesives (6%). With the flux of the market, the components of the composition and function must be understood and then used after corrosion. Do not use it blindly, causing the corroded component to be on its back.
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