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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.
They are classification codes from the international standard for brazing filler metals. Each code identifies a defined alloy composition, so two products carrying the same code should have the same make-up even if they are sold under different names. Older standards used different codes, and some products list both.The code helps you compare alloys and check that a replacement matches the one in your procedure. It does not tell you the diameter, whether the rod is flux coated or the pack size, so check those separately on the product details.
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.
Bare rod is used with flux applied separately, as a paste or powder mixed with water, which lets you place the flux exactly where it is needed and choose a flux to suit the job. Flux-coated rod carries the flux on the outside, so you do not have to apply it by hand, which is convenient for site and repair work and for awkward positions.The coating suits many jobs, but where you need a specific type of flux, such as for stainless steel or long heating cycles, bare rod with a chosen flux is often the better route. Check the maker's data sheet for the flux type.
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.