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I am not even remotely an expert on it however....
I always sand or wire brush the pipe to make it raw copper and then wire brush the inside of the joint, then apply flux to the pipe, and push it into the joint, and rotate. Then apply the torch, and solder when the flux is bubbling. It does not take much solder to wick into the joint and then a dab more solder to make a stronger joint.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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