Copper brazing rods are indispensable filler materials in HVAC, refrigeration, pipeline installation, automotive, and industrial manufacturing. With excellent fluidity, high strength, and corrosion resistance, Chalco copper brazing rods deliver clean and reliable joints under various working conditions, providing customers with stable and efficient brazing solutions.
- High joint strength with excellent corrosion resistance
- Good fluidity for quick wetting and gap filling
- Available in self-fluxing, flux-coated, and fluxless types
- Global supply, fast delivery, and OEM customization support
Chalco Copper Brazing Rod Product Types & Specifications Overview
Chalco offers a full range of copper brazing rods, covering typical joining scenarios such as copper-to-copper, copper-to-brass, copper-to-steel, and copper-to-aluminum.
- Alloy Systems: High Copper Alloy, Brass Brazing Alloy, Phos-Copper Brazing Alloy, Silver-Copper Alloy, and other Special Copper Alloys
- Diameter: 1.5mm / 2.0mm / 2.5mm / 3.0mm
- Length: 330mm / 500mm / 1000mm
- Forms: Rods, Coils, Wires, and Preformed Rings
- Packing: 5 pcs / 10 pcs small packs, 0.5kg / 1kg industrial packs, OEM available
Copper to Copper Brazing Rods
For copper-to-copper and copper-alloy brazing, Phos-Copper Alloys (AWS BCuP series) are most common. Made of copper and phosphorus, some grades add silver for strength and corrosion resistance. Their self-fluxing property usually eliminates the need for extra flux.
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- Phosphorus → Self-fluxing, no additional flux required
- Silver → Improves toughness and corrosion resistance
- Not suitable for steel due to phosphorus-induced embrittlement
- Typical Applications: Copper tubing joints in HVAC systems, household appliances, and electrical connectors
| Alloy (AWS) | ISO Equivalent | Chemical Composition (wt%) | Melting Range (℃) | Recommended Brazing Temperature (℃) |
| BCuP-2 | CuP 181 | Cu + 7% P | 710–793 | 740–790 |
| BCuP-3 | CuP 281 | P 5.8–6.2%, Ag 4.8–5.2% | 645–815 | 680–740 |
| BCuP-4 | CuP 283 | Cu + 7% P + 6% Ag | 643–724 | 680–720 |
| BCuP-5 | CuP 284 | Cu + 5% P + 15% Ag | 645–800 | 670–720 |
| BCuP-6 | CuP 280 | Cu + 7% P + 2% Ag | 643–788 | 670–720 |
Copper to Brass Brazing Rods
For copper–brass and copper–copper joints, Brass Brazing Alloys (AWS RBCuZn series) are commonly used. These alloys are mainly composed of copper and zinc, with small additions of nickel, manganese, or silicon to enhance joint strength and corrosion resistance.
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- Low cost with good fluidity
- High joint strength; Ni/Mn-containing grades offer enhanced fatigue and corrosion resistance
- Applications: Valves, gas fittings, sanitary hardware, brass components
| Grade (GB/T) | Grade (AWS/ISO) | Cu (%) | Zn (%) | Other Elements | Melting Range (℃) | Recommended Joint Gap (mm) |
| RBCuZn-A | – / Cu470 | 56–64 | Bal. | Si <0.5, Sn <1.0, Fe <0.25 | 870–900 | 0.05–0.25 |
| RBCuZn-C | AWS C68100 / Cu681 | 56–64 | Bal. | Si 0.01–0.5, Mn 0.75–1.10, Sn <0.5, Fe 0.25–1.25 | 870–900 | 0.05–0.25 |
| RBCuZn-D | AWS C77300 | 46–50 | Bal. | Si 0.04–0.15, Ni 9–11 | 920–940 | 0.05–0.25 |
| BCu59Zn(Sn) | ISO Cu470 | 57–61 | Bal. | Sn 0.2–0.5 | 875–895 | 0.05–0.25 |
| BCu60Zn(Si) | ISO Cu470a | 58.5–61.5 | Bal. | Si 0.2–0.4 | 875–895 | 0.05–0.25 |
Copper to Steel Brazing Rods
For copper–steel connections, commonly used brazing alloys include Silver-Copper Alloys (AWS BAg-1, BAg-7), Brass Brazing Alloys (RBCuZn-D, AWS C77300), and Special Copper Alloys such as CuNi and CuMnNi systems.
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- For low-cost mass production: Brass alloys such as RBCuZn-D
- For low-temperature, high-reliability joints: Silver-based alloys (BAg-1, BAg-7)
- For high-temperature or corrosive environments: CuNi or CuMnNi alloys
| Alloy | Chemical Composition (wt%) | Melting Range (℃) | Recommended Brazing Temperature (℃) |
| RBCuZn-D | Cu + 40 Zn + Ni + Mn | 870–890 | 900–940 |
| BAg-1 | 45 Ag + Cu + Zn + Cd | 645–815 | 680–740 |
| BAg-7 | 56 Ag + Cu + Zn | 620–660 | 650–710 |
| CuNi Series | Cu + 10–30 Ni | 1100–1140 | 1150–1200 |
| CuMnNi Series | Cu + 20–40 Mn + Ni | 975–1000 | 1000–1050 |
Copper to Aluminum Brazing Rods
For copper–aluminum dissimilar metal connections, brazing alloys mainly include Zn-Al-Cu and Al-Si systems.
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- Zn-Al-Cu Alloys: Low melting point, good fluidity, suitable for mass production
- Al-Si Alloys: Excellent wetting, suppress galvanic corrosion, ideal for durability applications
- Always used with special flux to ensure dense welds and high strength
| Alloy System | Main Composition | Melting Range (℃) | Recommended Brazing Temperature (℃) |
| Zn-Al-Cu | Zn 40–50%, Al 5–10%, Cu | 380–500 | 420–500 |
| Al-Si | Al-Si (10–12%) + Cu | 520–600 | 550–620 |
Flux-Coated & Fluxless Copper Brazing Rods
Flux-Coated: Rods coated with flux, suitable for on-site construction and pipeline maintenance.
Fluxless: Bare rods requiring separate flux, commonly used in automated factory production.
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| Type | Melting Range (℃) | Recommended Brazing Temperature (℃) |
| Flux-Coated | 650–750 | 700–760 |
| Fluxless | 650–850 | 700–780 |
The above list only showcases some of Chalco's featured copper brazing rod products. We can also provide other brass, silver-based, or customized alloy formulations according to customer requirements. Please check the product details or contact our professional sales team directly for one-on-one selection guidance and quotations.
Chalco copper brazing rod application fields & selection guide
Copper brazing rods are widely applied in HVAC, construction piping, automotive, and electrical systems. By selecting the right alloy according to the base metal and working environment, joint strength, corrosion resistance, and long-term reliability can be ensured.
HVAC & Refrigeration
Applications: Evaporators, condensers, air-conditioning copper pipe joints
Recommendation: Phos-copper alloys for copper-to-copper; use flux when brazing copper-to-brass or copper-to-steel
Construction & Plumbing
Applications: Water pipes, valves, sanitary brass fittings
Recommendation: Brass brazing alloys; flux-coated rods for on-site work
Automotive & Electrical
Applications: Radiators, oil coolers, hydraulic pipelines, electrical connectors
Recommendation: Silver-based alloys for high strength/temperature; brass alloys for mass production
Copper–Aluminum Transition
Applications: Copper tube–aluminum fin joints, auto A/C lines, power electronics
Recommendation: Zn-Al-Cu or Al-Si alloys with special flux to prevent galvanic corrosion
For tailored recommendations and samples, please contact Chalco to get the best copper brazing solution for your project.
Chalco Copper Brazing Rod Technical Advantages
- Wide melting range (380–1140℃), covering HVAC, automotive, and industrial needs
- Silver alloys → higher strength & toughness; Phos-copper → self-fluxing; Tin → better wetting & crack resistance
- Compatible with flame, induction, and furnace brazing
- Available in flux-coated (easy repair) and fluxless (automation) types
Comparison with Other Filler Materials
| Category | Copper Brazing Rods | Soldering Brazing Rods | Aluminum Brazing Rods | Fusion Welding |
| Strength | High, suitable for pressurized structures | Low | Medium, suitable for aluminum | High, but large heat-affected zone |
| Temperature Resistance | High, long-term stability | Low | Medium, limited by aluminum alloys | High, but prone to distortion |
| Process Requirements | Flame/Induction/Furnace, minimal heat effect | Low temperature, simple operation | Narrow range, strict control required | High heat input, advanced equipment |
| Flux | Some self-fluxing / flux-coated options | Required | Usually required | Not required, but complex process |
| Applications | HVAC, automotive pipelines, industrial repair | Small appliances, low-pressure fittings | Aluminum heat exchangers, aluminum pipes | Thick-walled & heavy-duty components |
Compared with soldering and aluminum brazing rods, Chalco copper brazing rods offer higher strength, better temperature resistance, and wider application adaptability, making them the ideal choice for HVAC and industrial pipelines.
Frequently Asked Questions (FAQ)
Q1: What is the difference between copper brazing rods and copper welding rods?
A1: Copper brazing rods are used in brazing at lower temperatures where the base metal does not melt. Copper welding rods are used in fusion welding where both base and filler metal melt together, suitable for structural joints.
Q2: Do copper-to-aluminum brazing rods require flux?
A2: Yes, dissimilar copper–aluminum joints must use special flux to prevent oxidation and ensure wetting.
Q3: What diameter brazing rod is commonly used for copper pipe?
A3: For household and HVAC systems, 2.0–2.5mm is common. For industrial thick-wall pipes, 3.0mm is recommended.
Q4: Can phos-copper brazing rods braze brass?
A4: Yes, but flux is required, since zinc in brass oxidizes easily.
Chalco supplies a full range of copper brazing rods, including Phos-Copper, Brass, Silver-Copper, and Copper-Aluminum systems, available in flux-coated and fluxless forms. Whether for HVAC, automotive, construction, or industrial manufacturing, we provide high-quality brazing solutions. Contact us anytime for samples, technical selection advice, fast quotations, or OEM/ODM services with global delivery.
Chalco can provide you the most comprehensive inventory of aluminum products and can also supply you customized products. Precise quotation will be provided within 24 hours.
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