How To Solder Copper Wire Without Flux
Allow the solder to cool and harden.
How to solder copper wire without flux. Make sure you match braid width to solder joint or contact pad. Yes solder can be used without flux. Put flux to the outer area of your pipes.
With the application of heat the solder beads melt and set into place. To do so you will need something other than flux to break down the oxides on the metal surface without which your surface may be damaged or not properly cleaned. Clean the specific area that you will be soldering.
Flux is applied to both the pipe and the fitting with a handy miniature paint brush. Flux will help with that and Handy Flux paste works great with copper and brass. We use a Smith torch here connected to airacetylene tanks.
There is no need to glob on more solder and run the risk of getting it in a place where you dont want it to be. Without flux the copper will oxidize as it heats up and will prevent a good fit as you put the fittings on the pipe. Use emery cloth or steel wool to clean the outside of the pipe.
Copper wire is a cheaper option. It is not a long-term solution though. The solder may stick in spots but it will not have wicked into the sweat joint properly and will not completely seal the joint.
Soldering Pipes with Soldering Flux. Apply Flux to Pipe. Soldering vertical copper pipe shouldnt be too different from working horizontally.