In precision refrigeration pipelines, electronic contacts, and cemented carbide cutting tools, silver-based brazing alloys are widely considered the preferred filler metals thanks to their low melting point, fast wetting, and strong joints. Chalco provides three main forms to match different production rhythms — straight rods, wire coils, and preformed rings — and performs batch-by-batch inspection on wire diameter tolerance and chemical composition to ensure consistent fluidity and mechanical properties.
*Cd-free eco-friendly formulation, with no toxic cadmium oxide fumes generated during welding, complying with RoHS and REACH international regulations and providing a safer, greener brazing solution for operators and end-use applications.
Chalco Silver Brazing Rod & Silver Solder Rod Product Series
To help customers rapidly lock in the best match among numerous options, Chalco adopts a three-dimensional system of silver content × functional modification × flux selection for refined product classification, truly covering all scenarios from cost-effective HVAC installation to high-reliability aerospace parts.
Basic Silver Brazing Alloys | Economical Choice
Core formulations: Ag5 and Ag15 low-silver systems with melting point ≥ 700 ℃, featuring cost-friendly materials.
Diameter range: Rods Ø 1.6–3.2 mm × 500 mm; wire coils Ø 0.5–1.5 mm (5 kg/coil).
Available forms: RapidRod bare rods, FluxOne flux-coated rods, FlexWire coils.
Performance features: Ag–Cu eutectic phase ensures fast wetting and reliable strength; uniform bead color and easy residue cleaning enable worry-free field operation.
Recommended scenarios: HVAC copper tube installation, hardware plumbing assembly, and routine maintenance.
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Economic Silver Series (Ag 5–15%)
Melting Point: ≥ 700℃
Key Features: Cost-friendly; wetting speed sufficient for mass assembly
Typical Uses: Copper tubes, brass valves, small stainless-steel parts
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General Silver Series (Ag 20–45%)
Melting Range: 630–780℃
Key Features: Flowability and shear strength significantly improved over low-silver grades
Typical Uses: Cu–stainless dissimilar joints, carbide tool tips, appliances and cookware
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High-Performance Silver Series (Ag 50–56%)
Solidus–Liquidus: low to 610℃
Key Features: Superior electrical & thermal conductivity
Designed For: Thin-wall stainless, electronic contacts, induction brazing in heat-sensitive cases
| Common Grade (AWS / ISO) | Ag (%) | Solidus (℃) | Liquidus (℃) | Shear Strength (MPa)* | Typical Applications |
| BAg-3 / ISO Ag215 | 15 | 705 | 745 | 250 | HVAC copper tubes, brass water valves |
| BAg-2 / ISO Ag220 | 20 | 750 | 780 | 260 | Stainless-steel tableware, Cu–steel dissimilar joints |
| BAg-6 / ISO Ag225 | 25 | 720 | 760 | 270 | Cu–stainless heat-exchanger sheets |
| ISO AgCuZn-30 | 30 | 690 | 730 | 275 | Hardware fittings, pump and valve housings |
| ISO AgCuZn-34 | 34 | 670 | 720 | 280 | Refrigeration piping, instrumentation joints |
| BAg-5 / ISO Ag345 | 45 | 630 | 680 | 290 | Carbide tool tips, tool steels |
| BAg-24 | 50 | 625 | 655 | 295 | Induction-brazed steel parts, electronic packaging |
| BAg-7 / ISO Ag456 | 56 | 610 | 630 | 300 | Electronic contacts, thin-wall stainless steel |
*Shear strength values are typical lab results; actual performance depends on joint clearance and process parameters.
Composite Silver Brazing Alloys | Performance Upgrade
Typical modification schemes: Ni–Ag high-strength wetting, Ag–Sn low-temperature protection, Ag–Cu–P self-fluxing, CleanSilver cadmium-free.
Available forms: RapidRod bare rods, FluxOne flux-coated rods, FlexWire coils.
Diameter range: Rods Ø 1.6–3.2 mm; coils Ø 0.8–1.5 mm (5 kg/coil).
Upgrade highlights: By intentionally adding Ni, Sn, or P, or adopting Cd-free formulations, wettability on tool steels, carbides, and heat-sensitive electronics is comprehensively improved, along with low-temperature brazability and environmental compliance.
- Phos–Copper–Silver Alloys (Ag–Cu–P): Self-fluxing, no external flux required when brazing copper and brass, widely used in copper piping and refrigeration valves.
- Sn/Ni Containing Silver Brazing Alloys (Ni–Ag, Ag–Sn): Adding Ni or Sn significantly improves wettability and reliability on tool steels, carbides, and heat-sensitive electronics.
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Ni–Ag Nickel Silver
Key Element: ~2% Ni
Benefit: Significantly improves wetting and shear strength on tool steel and carbon steel
Recommended Uses: Carbide tips, die/mold brazing
Notes: Designed for high-strength joints on ferrous substrates
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Ag–Sn Low Temperature
Key Element: ≤ 2% Sn / Li
Benefit: Lowers solidus–liquidus to about 610 ℃ for low-heat input brazing
Recommended Uses: Sensitive electronics, thin-wall stainless steel, induction brazing
Notes: Helps prevent overheating and distortion
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Ag–Cu–P Phosphorus Silver
Key Element: ~6% P
Benefit: Self-fluxing on copper and brass, no external flux required
Recommended Uses: Copper and brass brazing with reduced process cost
Notes: Ideal for piping, refrigeration valves
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CleanSilver Cadmium-Free
Key Feature: Completely removes Cd in mid/high-silver formulations; RoHS & REACH friendly choice
Benefit: Meets food-grade, medical-grade, and green manufacturing requirements
Recommended Uses: Food-contact and medical equipment, eco-compliant processes
| Modification Type | Common Grade (AWS / ISO) | Ag (%) | Key Element | Solidus (℃) | Liquidus (℃) | Shear Strength (MPa)* |
| Ni–Ag | BAg-24 | 50 | Ni ≈ 2% | 625 | 645 | 300 |
| Ag–Sn Low Temperature | ISO AgCuZn-34Sn | 34 | Sn ≤ 2% | 660 | 700 | 280 |
| Ag–Sn Low Temperature | ISO AgCuZn-40Sn | 40 | Sn ≤ 2% | 640 | 680 | 285 |
| Ag–Cu–P | BCuP-3 | 5 | P ≈ 6% | 645 | 810 | 200 |
| Ag–Cu–P | BCuP-5 | 15 | P ≈ 5% | 645 | 705 | 240 |
| CleanSilver Cd-Free | ISO AgCuZn-45 (Cd-Free) | 45 | — | 630 | 680 | 290 |
*Upgrade your brazing with Chalco's modified silver alloys—stronger joints, lower heat input, and eco-friendly compliance. Contact us today for details.
Flux Selection | Higher-Efficiency Silver Brazing Solutions
Available forms: FluxOne flux-coated rods, CoreStick cored rods, CoreWire cored coils.
Core advantages: Flux and silver filler are integrated, melting and activating simultaneously upon heating. Wetting and gap-filling are accelerated, welds are full with minimal residue, and true one-step brazing is achieved without extra paste or powder, significantly saving time and consumables.
Diameter range: Coated rods Ø 2.0–3.2 mm; cored coils Ø 0.8–1.6 mm (5 kg/coil).
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Flux-Coated Rods
Construction: Special flux evenly coated on standard silver rods
Benefit: One-step brazing without additional paste or powder
Best For: Rapid on-site work
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Cored Rods / Cored Wires
Structure: Flux embedded in the core, released upon melting
Benefit: Clean welds with low residue
Best For: Automation and long-duration continuous feeding
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Continuous Wire Feeding Products
Supply: Wire coils for continuous feed
Benefit: Significantly boosts takt time with shielding-gas processes or robots
Best For: High-volume production lines
| Key Metric | FluxOne Coated Rods | CoreStick Cored Rods | CoreWire Cored Coils |
| Flux Distribution | Outer coating | Core-filled powder | Core-filled powder |
| Flux Content | 3–5 wt% | 8–10 wt% | 6–8 wt% |
| Typical Diameter | Ø 2.0–3.2 mm | Ø 2.4 / 3.2 mm | Ø 0.8–1.2 mm |
| Feeding Method | Single-rod manual | Single-rod manual | Coil automatic/robotic |
| Recommended Scenarios | Quick on-site repair | Thick-wall steels, high-strength joints | Mass production, automation |
| Weld Residue | Minimal, brushable | Minimal | Trace powdery |
| Suggested Gap* | 0.03–0.08 mm (Cu) / 0.05–0.15 mm (Fe) | Same as left | Same as left |
*Choose Chalco's flux-integrated silver brazing solutions for faster, cleaner, and one-step operations—contact us to get tailored options for your production line.
Key Performance Advantages of Chalco Silver Brazing Rods
Low-temperature, fast brazing: The Ag56 alloy has a liquidus of only 630 ℃, enabling one-pass forming in heat-sensitive conditions such as thin-wall stainless steel and electronic components without base-metal distortion.
High-strength joints: Mid-to-high silver grades deliver 270–300 MPa shear strength, meeting high-load needs of carbide tips and pressure pipelines.
Eco compliance and safety: Full Cd-free silver alloys combined with low-halogen fluxes produce no cadmium oxide fumes; RoHS 2.0 and REACH compliant, with SGS and EN 10204-3.1 certificates available.
Diverse forms, ready on demand: In addition to rods and coils, customized preformed rings, brazing foils/sheets, and powders are available; 48-hour stock delivery and 7–15 days for tailor-made formulations.
| Representative Grade | Melting Range (℃) | Shear Strength (MPa) | Conductivity (% IACS) | Typical Application |
| BAg-3 (Ag15) | 705–745 | 250 | 20 | HVAC copper tubing |
| AgCuZn-34 (Ag34) | 670–720 | 280 | 24 | Stainless kitchenware, mixed-metal joints |
| BAg-7 (Ag56) | 610–630 | 300 | 29 | Electronic contacts, thin-wall stainless induction brazing |
Shear strength is a typical laboratory value. For a complete XLS dataset (chemical composition, elongation, thermal conductivity, etc.) or customized preforms/powder specifications, please contact us.
Chalco Silver Brazing Rod Industry Application Reference
The following are five of the most common application scenarios to provide a quick and intuitive alloy selection guide. For special base metals, extreme thermal windows, or customized forms, feel free to contact the Chalco technical team for targeted formulations and samples.
HVAC Refrigeration Copper Tubing
Recommendation: Ag15 bare rods or Ag15P phosphorus silver self-fluxing rods
Process: Around 700 ℃ quickly fills the joint gap
Best For: On-site mass installation and rapid maintenance
Cemented Carbide Tools and Tool Steels
Recommendation: BAg-24 nickel-silver (~2% Ni) with FluxOne coated rods
Process: High wetting and shear strength in 625–645 ℃ window
Stainless Kitchenware and Plumbing Hardware
Recommendation: Mid-silver grades Ag34 or Ag25
Process: With RapidRod bare rods, 0.05 mm gaps filled within seconds
Result: Bright post-braze appearance
Electronic Contacts and Thin-Wall Induction Brazing
Rec: High-silver BAg-7 (Ag56) or Ag45 Cd-free alloys
Feature: Liquidus as low as 630 ℃, conductivity up to 29% IACS
Support: Fine-size FlexWire coils for robotic feeding
Medical and Food-Grade Equipment
Recommendation: CleanSilver Ag45 Cd-free alloy
Compliance: Meets RoHS 2.0 and FDA food-contact requirements
Best Pairing: FlexFoil brazing foils for vacuum brazing, clean and polishable joints
If you need more solutions such as aluminum radiator brazing, hardfacing repair of oil-drilling tools, or additive-manufacturing powder overlays, please contact us for one-on-one application advice and sample support.
Brazing Process Guide & FAQ
To ensure Chalco silver-based brazing alloys perform optimally across different equipment and base metals, the following process essentials and common on-site questions provide a quick reference. For special conditions not covered, please consult our application engineers.
Recommended Heating Methods and Temperature Windows
- Flame: Neutral to slightly reducing flame; stop once the alloy shows bright flow
- Induction: 20–40 ℃/s heating rate; hold 3 s after full penetration
- Vacuum/Furnace: Preheat 50 ℃ below solidus; complete brazing at 20 ℃ above liquidus
Recommended Joint Clearances
- Copper and its alloys: 0.03–0.08 mm
- Stainless steel and low-carbon steel: 0.05–0.15 mm
- Tool steel or carbide: 0.03–0.05 mm (works best with Ni–Ag series)
Flux Matching
- General copper parts → Flux 1020 (650–780 ℃)
- Stainless / tool steel → Flux 1050 (700–820 ℃)
- High-volume Cu–brass → choose Ag–Cu–P self-fluxing alloys, no external flux required
FAQ
Q: What if the weld fails to wet properly?
A: Remove oxide layers and add fresh flux; for steel parts, prioritize Ni–Ag series alloys.
Q: What if post-braze residue is difficult to remove?
A: Use FluxOne coated rods or clean with warm water and a soft brush; avoid overheating that sinters flux.
Q: What if the filler loses zinc or becomes brittle?
A: Lower flame temperature by about 20 ℃, or switch to high-silver Ag–Sn low-temperature grades.
Q: Worried about overheating thin-wall parts?
A: Choose Ag56 or Ag–Sn low-temperature series with liquidus around 630 ℃.
Chalco Silver Brazing Rod Compliance & Ordering
Cd-free formulations with zero cadmium-oxide fumes during welding, compliant with RoHS 2.0 and REACH limits.
Production system certified to ISO 9001 and IATF 16949 with batch traceability.
EN 10204-3.1 material certificates provided with each batch; SGS / TÜV third-party reports and flux SDS available upon request.
Designated grades pass FDA food-contact heavy-metal leaching tests, suitable for medical and catering equipment.
Make every braze sound and reliable the first time — Chalco Silver Brazing Rod looks forward to providing you with efficient and compliant brazing solutions.
Phos–Copper–Silver Alloys (Ag–Cu–P)
| Stock Model | Standard | Ag (%) | Melting Range (℃) | Main Applications |
| Ag20 | AWS BCuP-5 / ISO CuP 284 | 20 | 690–810 | Copper–copper / copper–brass pipelines, refrigeration valves |
| Ag25 | AWS BCuP-6 | 25 | 670–760 | High-frequency induction brazing, large-section copper bars |
| Ag30 | ISO CuP 286 | 30 | 680–765 | Food-grade stainless and copper assemblies |
| Ag45 | AWS BAg-5 | 45 | 605–715 | High-conductivity joints, small-tube fast brazing |
Sn/Ni-Modified Ag–Cu Alloys
| Stock Model | Alloy Highlights | Ag (%) | Melting Range (℃) | Main Applications |
| Ag50Sn | Ag–Cu–Sn | 50 | 640–750 | Stainless heat exchangers, carbide tool tips |
| Ag45Ni | Ag–Cu–Ni | 45 | 655–775 | High-voltage electrical contacts, motor commutator segments |
| Ag55SnNi | Ag–Cu–Sn–Ni | 55 | 630–740 | Precision instruments, micro-brazing of medical devices |
| Ag60Sn | High-silver Cd-free | 60 | 650–720 | Electronic packaging, spot brazing of gold-plated terminals |
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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