手工电子焊接和工具的资料（Manual electronic soldering and tool data）.docVIP

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手工电子焊接和工具的资料（Manual electronic soldering and tool data）.doc

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手工电子焊接和工具的资料（Manual electronic soldering and tool data） Welding history: About 3000-5000 of history. Traces of bonding between objects can be found in the remains of Egypt, Greece, Rome and other regions Two. What is the soldering soldering? Is one of a kind of welding method, is to use the low melting point metal bonding than flux to metal bonding, the flux most are made of an alloy of tin and lead. Three. The necessary conditions for soldering: supply 1. to have appropriate flux; 2. metal surfaces must be clean (using flux cleaned); 3. metal part should be in the appropriate temperature range (TIPS temperature choice). Four. A good soldering point is: solder 1. flu naturally, side view as the skirt shape; 2. surface luster, wetting and feel smooth; 3. appearance should not be broken, perforation and other abnormalities. Five. The use of flux: in the welding time, if the joint metal surface dirt or rust (oxidation), solder is not infiltration, that would not produce alloy layer, and the flux is to remove dirt or metal oxide surface, it has 1. to remove oil and dust and oxide film the metal surface; 2. to prevent further oxidation, because the metal will speed up the oxidation of metal in a state of high temperature and air flux will contact the use of metal junction barrier coverage, air, prevent the oxidation of the 3. generation; reduce the surface tension of solder, promote the integration between the metal, so the soldering flux is indispensable one of the items. Six. Flux choice: flux is corrosive, different flux of different varieties of corrosion is different, there are strong and weak, according to different welding purposes and metal types to choose......... Seven. Solder choice: to choose a suitable solder, can be carried out from the following aspects: 1. According to the type of solder: lead solder and lead-free solder, which should be considered whether high temperature solder or low temperature solder; and lead-free solder is in recent years, in the n