Today, a lot of used tin solders, which are widely in demand in electronics, electrical engineering, automotive, as well as the installation of HVAC equipment. It should be noted that all the tin solders are very inexpensive and practical to use, have high strength, ductility, thermal conductivity, corrosion resistance. Suitable for soldering all non-ferrous metals and alloys.
In the solder composition of tin include such low melting metals such as tin, antimony, lead, aluminum alloy, zinc, cadmium, silver. Soldering strength of up to 8 kg / mm 2 and is directly proportional to the content of tin in the solder. The presence of antimony is typically strengthens solder joint. But this largely depends on the connected materials. When connecting a copper — of Sb increases the strength of solder joints, of Sb already has to do with the influence of the soldering of brass parts and for soldering iron — reduces the strength of solder joints.
It is known that zinc increases the corrosion resistance of brazed joints aluminum alloys. Increased zinc content requires additives such as Ag or Cd. Solders having 10−40% Zn, commonly used for tinning / brazing aluminum alloys by ultrasonic or abrasive. With increasing zinc content increases the melting point of the solder.
Soft solder is supplied as a rod, at least — in the form of a wire placed inside flux. It can be used a so-called paste — a solder powder mixed with a flux. However, it should be remembered that the application of the paste is associated with a number of features. For example, zinc chloride — is very hygroscopic and if it is not removed from the solder joints, can cause corrosion. Do not use ammonia or ZnCl 2 when soldering electrical measuring instruments, due to the risk of verdigris on a copper wire tool, which can cause distortion of the evidence and damage the appliance. When soldering tin solder as flux is generally used rosin
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