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  1. #1
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    need help for brazing HVAC lines



    What is the best roll of silver brazing or rods that will flow using mapp gas?
    Last edited by hammerdean; 25-01-2015 at 10:47 AM.



  2. #2
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    Aug 2006
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    Re: need help for brazing HVAC lines

    For copper to copper i'd use 5%, for copper plated steel, txv's and service valves 15% and for dissimilar metals like brass and steel you'll need a rod with a silver content about 40% and a suitable flux. Make sure your torch has a high enough capacity to cope with the line size you are working on, prolonged heating will cause poor brazed joints, i think the silver boils off when heated too long making porous joints.
    Mostly found in Oxfordshire, UK :)

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