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15% dosent work on steel. You have to have either 45% or 56%. Some come as flux coated rods or bare wire with seperate flux.
The braze only goes where ther is heat and flux. If you did not flux the outside of the female fitting then there will not be any adhesion there.
PS. I have never used black paste flux. If you are using Harris brazing products (stay silv) then you need to be using thier white brazing flux. I have seen people get brazing flux and soldering flux mixed up. I know you did not but I just had to through that in there
Last edited by ultralo1; 07-06-2009 at 08:12 AM.
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