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Cadmium Free Silver Solder No 43 with full flux coating. EN ISO 17672 Ag 155 EN 1044: AG 103, BS: 1845 AG14 Metal Composition%: 55 Ag, 21 Cu, 22 Zn, 2 Sn Melting: 630 - 660°c U.T.S N/mm²: 415 Hardness BHN: 145
Straight answers to the questions people ask most when choosing and using silver brazing rods and wire.
It tells you roughly what sort of alloy it is. Silver brazing alloys range from fairly low to high silver content, and the balance is mainly copper and zinc, sometimes with a little tin or nickel. The silver content affects colour, melting range and how freely the filler flows.As a general guide, higher silver alloys are whiter and tend to run at lower temperatures and flow more freely into tight joints, while lower silver alloys look more yellow, like brass. The exact melting range and best joint gap are different for every alloy, so read the maker's data sheet rather than relying on the percentage alone.
Older silver brazing alloys often contained cadmium, which gives off highly toxic cadmium oxide fume when it is heated, and overheating makes this worse. The HSE has guidance for people using cadmium-containing brazing products, and serious illness has been recorded after exposure to the fume.Cadmium-free alloys remove that particular hazard and are the usual choice today. You still need good ventilation or local extraction for the flux and metal oxide fume, and you should be careful with any cadmium plating on the parts, which should be dealt with before heating. Follow the maker's safety data sheet and your risk assessment.
Yes, unless the rod already carries a flux coating. Flux removes the surface oxides that form as the metal heats and keeps the surface clean until the filler has flowed. It does not remove oil, paint or grease, so the parts must be cleaned first.The flux has to be active before the filler melts and remain active until the joint has solidified. If the heating cycle is long, the flux can wear out, so use a flux suited to the temperature range and the parent metals. Silver brazing fluxes are not suitable for aluminium.
Very small. Silver brazing relies on capillary action, which draws the molten filler into a narrow gap, so the parts should fit closely with only a fraction of a millimetre between them. Too wide a gap weakens the joint and can leave voids, while no gap at all stops the filler entering.The best gap is the one at brazing temperature, not room temperature, and it changes if the two metals expand at different rates. The maker's data sheet gives the recommended gap for each alloy, so use that figure.