How to Sweat Copper Pipes : Applying Flux to Copper Pipes

How to Sweat Copper Pipes : Applying Flux to Copper Pipes

Hey everybody Don Golden with Expert Village
and we’re moving on with our copper piping. I’m going to show you now what you need to
join these in everlasting matrimony. What we are going to do is we are going to use
what is called flux paste. This is a water soluble product that is used whenever you
are soldering. It is a kind of nasty looking pasty kind of material that once you put it
on and they actually make a brush for it as well and it is available in any hardware store.
You want to take your flux and run it around there until you see it turn gray again. There
we go. Sometimes it turns colors when it sits around for a while but it doesn’t mean it
is bad. Then you are going to flux every part of this thing that is going to be soldered.
You are going to flux the outside pieces. You are going to flux the inside pieces, like
this, stick it in and swirl it around, make sure that you are going to get good coverage
because this stuff is what makes the solder flow and harden very quickly once it heats
up. Again it is water soluble so you don’t have to worry about it once it seals and you
have water coming through here it cleans itself out. There you go. We have got a whole bunch
of flux on here. Now when we come back we are going to fit these back together and obviously
when you are in the middle of the job you want to make sure that everything is fit perfectly
and we are going to dry fit when we come back.

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About the Author: John Markowski


  1. Here's a simple formula so you don't have to waste time dry fitting:
    c to f minus makeup equals takeoff(void).
    center to face of fitting measurement minus the distance the pipe goes into the fitting equals how much you should cut off a measurement that is taking from center of pipe to end of pipe. Find the voids of all the fittings you will be working with an write them down. Then take all your measurements as Center to Center and subtract these voids for an end to end measurement.

  2. wow…..excellent video……..awesome labeling, excellent instruction…. COMPLETELY STUPID…you didnt even show or mention ANYTHING that pertained to soldering or even applying flux…other than you taking a good 10 seconds of a one minute video to tell us how you got ahead of yourself and already applied your soldering flux before dry fitting….to a damn joint u made out of old corroded pieces that didnt even need to be dry village my ass.

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