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RX391500 SIF SILVER SOLDER No 39, 1.5mm Brazing Wire, 1Kg Pack
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    Rapid Ref : RX391500  

    SIF SILVER SOLDER No 39, 1.5mm Brazing Wire, 1Kg Pack
    RX391500

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    Cadmium Free silver solder is suitable for use on all ferrous and non-ferrous metals, except aluminium. It can be used with a range of heat sources. Use SIF SILVER SOLDER flux.

    EN ISO 17672 Ag 138

    Metal Composition%: 38 Ag, 32 Cu, 28 Zn, 2 Sn
    Melting: 650 - 725°c
    U.T.S N/mm²: 460
    Hardness BHN: 140

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    Silver (Ag) FAQs

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

    What do designations such as Ag 155 or Ag 140 mean?icon-minus-redicon-plus-red

    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.

    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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