Soldering filler materials are available in many different alloys for differing applications. In electronics assembly, the eutectic alloy with 63% tin and 37% lead (or 60/40, which is almost identical in melting point) has been the alloy of choice. Other alloys are used for plumbing, mechanical assembly, and other applications.
Don’t use a big soldering iron and the big 1/4-inch, acid-core solder used for plumbing, which are typically found at home improvement stores. If you do, you might damage sensitive electronic components. Use rosin-core solder to form the bond in your projects.
What is solder? Traditional solder that used to be used for soldering in the electronics industry used to be a mixture of tin and lead. Different types of solder are used for different purposes. Solder is of course used in plumbing. The type of solder used for electronics usually contains 60% tin and 40% lead.
Jewelers use soldering pens and soldering irons with interchangeable tips, and they also use accurate torches that burn propane or butane. The solder has a high percentage of silver, and jewelers typically use borax flux to reduce the metal oxides that form when you apply heat to metal. Flux is an important component of any soldering job.
The remaining solder types are used in decreasing order of hardness during the process of making an item, to prevent a previously soldered seam or joint desoldering while additional sites are soldered. Easy solder is also often used for repair work for the same reason. Flux is also used to prevent joints from desoldering.
The first step in soldering is cleaning the surfaces, initially with sandpaper or steel wool, and then by melting flux onto the parts. Sometimes, flux is part of the alloy of the wire, in an easy to use mixture. Then, the pieces are both heated above the melting point of the solder (but below their own melting point) with the iron.
However, there are several applications where additional flux is beneficial, such as surface-mount soldering and desoldering. In all cases, the best flux to use is the least acidic (least aggressive) flux that will work on the oxide on the components and result in a good solder bond.
Why flux is used in soldering and What is Solder Flux ?A flux (derived from Latin Fluxus meaning “flow”) is a chemical cleaning agent, flowing agent or purifying agent. The selection of soldering Flux and cleaning process plays a critical role in the manufacturing yield and product reliability of electronic assemblies.
Solder paste is the form of solder that is used in association with infrared reflow machines during the PCB assembly process. Solder paste is used in PCB assembly as it provides significant advantages and its form enables the process to become a simple and easy process.
Lead alloys were the standard for solder used in electronics for decades, but due to the health issues associated with lead, manufacturers are moving away from lead-based solders. One of the most popular lead-free alloys is a 96.5/3/0.5 alloy with 96.5% tin, 3% silver, and 0.5% copper.