![]() Amtech is a multi-national firm that makes both flux and solder paste, leaded and lead-free, at factories in Asia and Europe. Unless you can verify that it contains pure rosin flux, it is best to avoid this stuff. Some of this stuff was made for tin-smith soldering and has been re-packaged as "electronic solder flux". Who knows what its composition is? It could be highly active but leave a corrosive deposit. Here is a website to get you started with a lead-free solder alloy paste you can apply from a syringe.īeware of the Chinese solder flux shown in your second video. The problem is finding real solder paste with the desired composition. You can re-solder with a eutectic 63% Sn-37% Pb alloy or a 60% Sn-40% Pb (nearly eutectic) alloy that melts at a lower temperature and produces IMO a better joint. Most SMT components are originally soldered using lead-free solder to comply with Euro RoHS standards. ![]() In your first video, an excellent presentation of SMT re-work using a sub-heater under the PCB to heat-condition multi-layers, and a hot-air pencil to actually melt and re-flow the solder paste, there is no mention of the paste composition. And those that do contain solder particles vary widely in composition. Soldering copper pipes is easy if you know how to use flux correctly! By understanding what flux does and following these simple steps, you can ensure that your solder joints are secure and long-lasting.Click to expand.As noted, not everything labeled as "solder paste" (especially if it originates in China) actually has solder particles in it. Once everything has been cleaned up properly, your copper pipe should now be ready for use! Conclusion: Be sure not to mix different types of cleaners, as they could react with one another and cause damage to your newly soldered joints. You can use hot soapy water or vinegar-based cleaners that are specifically designed for cleaning up after soldered joints. When finished, let your pipes cool down completely before attempting to clean up any excess flux residue left over from the process. You can then place your pipes together and start soldering immediately without waiting for the flux to dry, as it will already be in place on both pieces of copper pipe when you start soldering them together. Make sure that you cover every part of the pipe connection with flux for it to work properly. Then, apply a generous amount of flux onto each pipe, where they will connect for soldering using a brush or applicator bottle. Once you have your flux, begin cleaning off your copper pipes with steel wool or sandpaper before applying it. Applying Flux Before Soldering Copper Pipes The flux removes any existing oxides on the surface of the metal and prevents any new ones from forming during the soldering process. It’s used to clean metal surfaces before welding or soldering them together. Understanding What Flux Is and Doesįlux is a paste-like substance made up of acids, ores, and other chemicals mixed with water. ![]() Let’s look at how to use flux when soldering copper pipes. Flux also prevents oxidation and corrosion from occurring on the joint. This compound helps the solder adhere to the copper, creating an airtight seal. If you’re looking to solder copper pipes, flux is a key ingredient.
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