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 SafraBraze 2AG 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.
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. SafraBraze 2AG is not suitable for use in sulphurous atmospheres at elevated service temperatures.
When selecting a brazing filler metal from the Safrabraze range 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.
SafraBraze 2AG is less ductile than SafraBraze 5AG, but more ductile than the silver free straight copper, phosphorus filler metals.
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.
- Composition: 2%Ag, 91.7%Cu, 6.3%P
- Conforms to: EN 1044 1999 CP105, ISO 17672:2010 CuP 279