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There are alloys, for the fluxless brazing of copper, with silver content ranging from 0 - 18% silver. There is an alloy to meet the service conditions of the joint, customers specification or ISO 17672.
Silver Free Alloys
CuP6 and CuP7 are silver free alloys. The lower phosphorus content of CuP6 produces a relatively slow running alloy suitable for bridging larger gaps and brazing overhead. CuP7 contains more phosphorus and is more free flowing and offers greater joint penetration. Use either on low stressed joints operating down to -10 deg C.
Both are available ex-stock in rod form 500mm x 1.5 -3.0mm dia and the popular 500 x 2 x 2mm square rod.
Silver Bearing Alloys
These alloys contain between 0.4 and 15% silver. The advantages offered by the silver are
increased joint ductility at ever decreasing temperatures, - greater resistance to vibration and thermal shock
lowering the brazing temperature and
improving alloy fluidity.
By ensuring total penetration of the joint, the risk of "ice blisters" and the most common cause of joint failure, is eliminated.
Ag2P - use it down to - 20 deg C
Ag5P/Ag6P - use down to - 30 deg C
Ag15P is the most durable and probably easiest alloy to use. It meets the most demanding operational conditions.
Ideal for temperatures down to -40 deg C. Often used on underfloor pipe runs.
The most common alloys are 55%, 40% and 38% silver. All are cadmium free.
455 melts at 630 - 660 deg C with good fluidity and will produce strong joints with only a small fillet
440 melts at 650 - 710 deg C is intrinsically cheaper and offers better gap filling properties.
438 melts at 650 - 720 deg C behaves very similarly to 440 but with the obvious advantage of a price reduction.
All alloys are available as bare rod 500mm x 1.0-2.5mm dia.
They are also available as flux coated rods 500mm x 1.5-2.0mm dia
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