Conrad, what do YOU use to join steel to copper?Originally posted by conrad1
[B I am still of the opinion NO FLUX IN ANY REFER SYSTEM!!!!!
hope that was loud enough!!! [/B]
Steel to steel?
Copper to stainless?
Stainless to stainless?
If all you ever work with is copper, then copper/silver/ phosphorus alloys work great, with no flux.
However, in the presence of phosphorus, steel becomes brittle.
Because of this reaction to phosphorus, a brazing alloy with no phosphorus must be selected.
The most commonly used is 45% silver.
It requires a brazing flux.
Brazing flux is not painted inside of the tubing, like a plumber would do it when soldering.
Instead it is applied only to the male portion of the tubes to be joined.
A good technique is to clean the joint, inside & out, then slip the joint BARELY together.
Next, brush the paste flux over the male portion of the pipe. Then slip the fitting together.
Contamination by flux will be minimized by using this method.
"Refer" manufacturers braze with flux every day when, dissimilar metals are used.