DC jack soldering facts and safety aspects In soldering, two metals are joined together by a third metal that has a lower melting point 450??C (842??F). This third metal is called the ??older?? When heat is applied to the parts to be joined, this causes the solder to melt and drawn into the joint by capillary action. Once the joint cools down, it has adequate strength and electrical conductivity to ensure a good electrical connection.
In the production of electric and electronic products, soldering operations are performed automatically on a mass scale. However soldering is also performed using hand tools, one joint at a time, in particular in repair situations or when fitting bulkier components on a circuit board.
Since soldering uses a large proportion of lead, it has been the target of widespread environmental legislation in recent years. The Restriction of Hazardous Substances Directive in Europe requires many new electronic circuit boards to be lead free by 1 July 2006 - mostly in the consumer goods industry, but in other industries as well.
The European Community has passed legislation to change the formulation of both solders and fluxes, urging the substitution of water-soluble non-rosin based fluxes. Electronics industries since the 1980s have gradually switched to these fluxes, allowing soldered boards to be cleaned with water or water based cleaners. The result is far cleaner waste products emanating from the whole production process, and a healthier environment.
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