Welded Properties Density:8.00 g/cc Electrical Resistivity:0.0000315 ohm-cm Solidus:645 Liquidus:790 Maximum Service Temperature, Air:149 Processing Temp.:730-810 Color: Light Copper Electrical Conductivity(% IACS): 5.5 Chemical Elements(%): P:6.8-7.2 Ag:1.8-2.2, Cu:Bal. HUAZHONG HZ-Ag2P is a 2% silver-copper-phosphorus brazing filler metal, which is used to braze copper and copper alloys. When brazing copper the phosphorus within the alloy imparts a metallurgical based self-fluxing capability. When HUAZHONG HZ-Ag2P is used to join copper alloys (such as brass, bronze or gun metal) a separate flux will be required because the self-fluxing action only occurs on copper (see below for details).
This filler metal should not be used to braze iron containing materials like carbon or stainless steels or nickel containing materials as the phosphorus within the filler metal will form brittle, intermetallic, phosphide compounds, at the joint interface. HUAZHONG HZ-Ag2P is not suitable for use in sulphurous atmospheres at elevated service temperatures.
When selecting a brazing filler metal from the silver copper brazing alloys, it is necessary to understand about the flow and ductility of the different
PRODUCTS. Phosphorus is the key element, the higher this is the more free flowing the filler metal, but the lower its ductility. Silver is used to improve the filler metal’s ductility, but reduces its flow properties.
HZ-Ag2P is less ductile than both HZ-Ag15P and HZ-Ag5P, but more ductile than the silver free straight copper, phosphorus filler metals like HZ-BCuP. It has better flow characteristics than HZ-Ag15P , but flows less well than HZ-Ag5P and HZ-BCuP. Due to its low ductility, it should only be used with capillary type joints. ‘Bell mouthed’ joints should be avoided.
The optimum joint gap for brazing is normally 0.05-0.2mm.
Product uses: It is widely used in the refrigeration, heating and ventilating and air conditioning industries for the brazing of copper pipework systems. This alloy has been used for fittings of copper cylinders where greater ductility is required than the standard copper phosphorus products used on the seams. It is also used in electrical engineering applications such as the brazing of electric motor rotor bars to end rings.
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