The aluminum rods I use does not use flux. I usually clean the area with
aluminum oxide sandpaper and clean through the heat induced oxidation
layer by scratching with the rod or stainless steel rod. To fill a hole
or wide gap I back it up with a fire brick or rusty steel so it won't
stick. You can melt aluminum with a propane torch and is a no-no for
braizing so try to keep the site just hot enough to melt the braizing
rod. Karibian


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