Flux-cored aluminium brazing rods.
Seven diameters from 1.6 to 4 mm at 500 mm length, working at 380 to 420 °C with an ordinary torch. Flux carried inside the rod, so there is nothing to mix, brush on or clean off. Batch-tested to AWS A5.8.
The flux is inside.
Brazing aluminium has one persistent enemy: oxide. Aluminium grows an oxide skin within seconds of being cleaned, and filler metal will not wet through it. Flux exists to strip that oxide at temperature and keep it off while the joint is made.
In a flux-coated rod the flux sits on the outside. In a flux-cored rod it is carried in a channel inside, and released as the rod melts — which means it arrives exactly where the joint is, at the moment it is needed, along the whole length of the run. Nothing to mix, nothing to brush on, and no stretch of joint left unfluxed because a brush missed it.
For field work that is not a marginal convenience. Holding a torch in one hand and a rod in the other, on a radiator in situ, an entire step of the process disappears.
Low enough to save the part.
The working range is 380 to 420 °C — well below the melting point of the aluminium being joined. That is the entire distinction between brazing and welding: the filler flows and bonds while the parent metal stays solid.
It matters most on exactly the parts people need to repair. A radiator core, a condenser, thin wall tube — these are components welding destroys and brazing saves. And because the range is reachable with an ordinary propane or MAPP torch, the repair does not require TIG equipment or the skill that goes with it.
- Aluminium to aluminium — general fabrication, tube, castings and sheet.
- Aluminium to copper — the dissimilar joint that appears throughout HVAC and refrigeration, where an aluminium coil meets a copper line.
- Radiator and condenser repair — pinholes, cracked seams, split tube ends. See HVAC and radiator repair.
Seven diameters.
1.6, 2, 2.2, 2.5, 3, 3.15 and 4 mm, all at 500 mm length. The rule for choosing is to match the rod to the thinnest part of the joint rather than the thickest — a heavy rod on thin tube demands more heat than the part can survive, and you melt the tube instead of the filler.
| Diameter | Suits |
|---|---|
| 1.6 – 2 mm | Thin-wall tube, small fittings, fine work where excess filler would flood the joint |
| 2.2 – 2.5 mm | General fabrication and medium sections — the most widely used range |
| 3 – 3.15 mm | Heavier sections and longer fillets, where a thin rod is simply slow |
| 4 mm | Thick sections and large fillets with plenty of torch behind them |
Mixed packs are available and usually sensible for a workshop taking varied work. See rod sizes in detail.
Quantities and supply.
Minimum order is quoted per order rather than fixed, because it depends on which diameters you need and whether you want a single mixed pack or repeat supply of one size. Tell us the diameters and roughly what you use in a year and you will get a firm price and minimum.
Batches are tested to AWS A5.8, the specification covering brazing filler metals. If your process paperwork needs batch details recorded, ask at order time so they ship with the consignment rather than being chased afterwards.
We ship pan-India, and across Delhi NCR by road with collection available from Ghaziabad — see brazing rod supply in Delhi NCR.
Common questions.
What diameters do you supply?
Seven: 1.6, 2, 2.2, 2.5, 3, 3.15 and 4 mm, all at 500 mm rod length. The thinner rods suit thin-wall tube and fine work where too much filler would flood the joint; the heavier ones suit thicker sections and larger fillets where a thin rod would simply take too long to fill.
What does flux-cored mean, and why does it matter?
The flux is carried inside the rod rather than painted on the outside. As the rod melts, the flux is released exactly where the joint is, at the moment it is needed — so there is no separate flux to buy, mix, apply or clean up, and no patch of joint left unfluxed because a brush missed it. For field work, where you are holding a torch in one hand and a rod in the other, it removes a whole step.
Can these rods join aluminium to copper?
Yes, and it is one of the main reasons this filler exists. Aluminium-to-copper joints are common in HVAC and refrigeration — an aluminium coil meeting a copper line — and they are difficult with conventional filler because the two metals behave so differently. A low-temperature flux-cored aluminium filler makes the joint at a temperature that does not damage either side.
What is the working temperature?
380 to 420 °C. That is well below the melting point of the aluminium parts being joined, which is the entire point of brazing rather than welding: the filler flows and wets the joint while the parent metal stays solid. It also means an ordinary propane or MAPP torch is generally sufficient — you do not need welding equipment.
Are the rods tested?
Batches are tested to AWS A5.8, the American Welding Society specification covering brazing filler metals. If your process paperwork needs the batch details recorded, ask at the time of order so they are supplied with the consignment rather than chased afterwards.
What is the minimum order quantity?
Quoted per order, because it depends on the diameter and whether you need a single mixed pack or repeat supply of one size. Tell us which diameters and roughly what annual quantity, and you will get a firm price and minimum rather than a range.
Do you ship brazing rods outside Delhi NCR?
Yes, pan-India. Rods are straightforward to pack and ship at 500 mm lengths. Within Delhi NCR — Delhi, Noida, Gurugram, Faridabad and across Ghaziabad — delivery is by road, and collection from the Ghaziabad facility is available if you would rather not wait.
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