Flux ?

[devlin maguire]

Hi All, Flux how is it best used, dip the hot rod, make up a paste, dust the pipe with a brush before inserting, or use a rod with a higher silver content if so how much % wise what do you use/do
Devlin

[chemi-cool]

The first and most important, clean the joints to be soldered till they shine, no oil residues.

I use on copper to copper 2% silifus rods and some times 5%.

If you use high silver content rods then you need flux.

Just heat the area to be soldered, add a small amount of flux and once its melted add the rod and with the flame cone, heat up the joint till it is full with the solder metal.

[monkey spanners]

As Chemi says, you don't need flux on copper to copper joints (also copper plated driers and sight glasses, and danfoss tev's) with rods with between 2% and 15% silver.
You need flux with 38% or 40% silver rods which you'd use on copper to brass or steel.

I buy the flux coated rods, they are plastic coated so the flux stays on, or i use plain rods and dip them in dry powder, i don't like the idea of mixing flux with water in a refrigeration use.

Jon

[devlin maguire]

pretty much as I do I had a discussion with someone who had some differing ideas and I wanted a concensuss
Dev