Brazing Rods & Fluxes — Silver, Brass, Aluminium Alloys

Brazing joins metals with a filler metal whose melting point is above 450°C but below the melting point of the parent metals. The parent metals don't melt — the filler flows by capillary action into a small gap (typically 0.05-0.15 mm) between the parts. Welding melts the parent metals and the filler together. Brazing produces less distortion, allows joining of dissimilar metals, and is used for thinner sections and small components. HVAC condensers, electrical contacts, and copper plumbing are almost always brazed, not welded.

Phos-copper (BCuP-2, BCuP-5) is self-fluxing on copper-to-copper joints — no separate flux needed. It's the most economical choice for HVAC and refrigeration where you're joining copper to copper. However, it's brittle on steel and shouldn't be used on copper-to-steel or copper-to-brass joints because the phosphorus forms brittle iron phosphides. For dissimilar joints (copper to brass, copper to stainless, steel to copper), use silver brazing alloys (BAg-1, BAg-5, BAg-7) with the appropriate flux.

Cadmium is restricted under EU RoHS Directive 2011/65/EU and many Indian electronics-manufacturing specifications. Traditional BAg-1 contains 24% cadmium for low-temperature flow. Modern cadmium-free alternatives (BAg-5, BAg-7, BAg-24) achieve similar properties without the toxicity. For HVAC, refrigeration, food-equipment, and any export application, use cadmium-free grades. Cadmium-bearing BAg-1 is still legal in India for industrial applications outside food/medical, but the trend is toward cadmium-free everywhere.

Yes. We supply Voltas, Daikin India, Blue Star, Amber Enterprises, and other HVAC OEMs and contract manufacturers with BCuP-2 and silver brazing rods in bulk pack sizes. Typical orders: 10-50 kg per delivery; rate-contract pricing available. Stock kept at our Secunderabad warehouse for same-day dispatch within Telangana / Andhra Pradesh and 3-7 day pan-India dispatch.

For stainless-to-stainless or stainless-to-copper, use BAg-7 (56% silver, cadmium-free) with a fluoride-bearing flux (FB3-C). The high silver content gives the lowest melting point and best gap-filling characteristics for stainless. For higher-strength applications (stainless-to-stainless on pressure vessels), nickel-based brazing alloys (BNi series) are sometimes specified — these are made to order with 4-8 week lead times.

Yes — every rod type ships with the matching flux. Borax-based fluxes (FB3-A) for brass-zinc and copper-zinc rods. Borate-fluoride fluxes (FB3-C) for silver brazing. Potassium-fluoroaluminate flux for aluminium brazing. Fluxes available as pastes (250 g jars), powders (1 kg jars), or pre-coated on rod (BAg-1F coated stick). Choose based on application — paste is easier for handheld torch work, powder is preferred for production-line dipping.

Stocked: silver rods (BAg-1, BAg-5, BAg-7), phos-copper (BCuP-2, BCuP-5), brass (RBCuZn-C), companion fluxes — same-day dispatch from Secunderabad. Made-to-order: aluminium-silicon (BAlSi-4), nickel-based brazing (BNi series), and pre-coated fluxed rods — 2-4 weeks lead time. Pack: silver rods in 1 kg moisture-barrier tubes; phos-copper in 5 kg cartons; fluxes in 250 g / 1 kg jars.