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RO431506 SIF SILVER SOLDER No 43, 1.5mm Brazing Wire, 6 Rod Pack - EN ISO 17672: AG 155, EN 1044: AG 103, BS 1845: AG 14
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    Rapid Ref : RO431506  

    SIF SILVER SOLDER No 43, 1.5mm Brazing Wire, 6 Rod Pack - EN ISO 17672: AG 155, EN 1044: AG 103, BS 1845: AG 14
    RO431506

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    Cadmium Free 55% Silver Solder, which is free flowing and ideal for close-fitting capillary joints and for a colour match on stainless. Use with SIF SILVER SOLDER flux.

    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

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    Silver (Ag) FAQs

    Straight answers to the questions people ask most when choosing and using silver brazing rods and wire.

    Why choose a cadmium-free silver brazing alloy?icon-minus-redicon-plus-red

    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.

    Do I need flux with silver brazing alloy?icon-minus-redicon-plus-red

    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.

    Should I buy bare rod or flux-coated rod?icon-minus-redicon-plus-red

    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.

    How big should the joint gap be for silver brazing?icon-minus-redicon-plus-red

    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.

    See all 6 questions for this category

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