Welding Rod HS221
Products Description
HS221 is a premium tin-silicon brass brazing alloy engineered to deliver industrial-grade, defect-free joints when joining dissimilar metals. This alloy is produced under a strict ISO 9001 quality control system and complies with AWS A5.8 and BS EN 14640 international standards. It is a highly regarded general-purpose copper-based brazing electrode in the global HVAC, automotive, metal processing and tooling industries.
Unlike ordinary low-cost brass brazing wire, HS221 contains precisely controlled trace amounts of tin and silicon in its composition. This unique formula significantly inhibits zinc volatilization during high-temperature heating, thereby minimizing toxic fumes and eliminating porosity, ensuring a bright and smooth weld surface with almost no need for post-weld grinding. Whether you run a small repair shop or operate a fully automated large-scale production line, the HS221 delivers reliable and consistent performance in every batch of products.
Core Advantages – Why Choose Our HS221?
| Feature | Benefit for Your Business |
|---|---|
| Ultra-Low Zinc Fume & Zero Porosity | Reduces workshop air pollution, cuts post-weld grinding time by 30%, and lowers overall labor cost |
| Excellent Capillary Flow | Penetrates narrow joint gaps smoothly, ensuring full, uniform bonding even on complex pipe fittings |
| High Mechanical Strength | Brazed joints reach tensile strength up to 380MPa, resistant to vibration, thermal cycling and long-term corrosion |
| Multi-Process Compatibility | Works seamlessly with flame brazing, induction brazing, furnace brazing and resistance brazing |
| Strict Batch Consistency | Every production lot undergoes spectral analysis to guarantee chemical composition stability, no unexpected melting point drift |
| RoHS-Compliant Formula | Meets EU environmental requirements, safe for use in food equipment, refrigeration and green manufacturing projects |
Full Technical Specifications
| Item | Detailed Data |
|---|---|
| Equivalent Grade | AWS A5.8 BCu60ZnSn-R, China National Standard BCu60ZnSn-R |
| Main Chemical Composition | Cu 59–61%, Sn 0.8–1.2%, Si 0.15–0.35%, Zn Balance |
| Impurity Control | Al ≤0.01%, Pb ≤0.05%, Total Impurities ≤0.5% |
| Melting Temperature Range | Solidus 890°C, Liquidus 905°C |
| Recommended Brazing Temperature | 910°C – 954°C |
| Available Diameters | 1.6mm / 2.0mm / 2.4mm / 3.0mm / 4.0mm / 5.0mm |
| Standard Length | 450mm / 1000mm (custom lengths available upon request) |
| Tensile Strength of Brazed Joint | ≥ 380 MPa |
| Electrical Conductivity | ≥ 22% IACS |
| Standard Packaging | 5kg / 10kg per shrink film, 500kg per fumigated wooden case |
| MOQ | 500kg (small trial orders 100–500kg also acceptable) |
| Production Capacity | 250 Tons / Month |
| Lead Time | Within 25 days after receiving formal order and deposit |
Wide Application Scenarios
HS221 is designed to handle almost all common general brazing jobs across industries:
- HVAC & Refrigeration: Brazing of copper pipes, valve bodies and heat exchangers in air conditioners and refrigeration units
- Automotive Industry: Joining of radiator components, brake parts and small structural assemblies
- Tool & Hardware Manufacturing: Brazing cemented carbide tips on saw blades, drill bits, cutting tools and mining tools
- Plumbing & Sanitary Ware: Welding copper fittings, brass valves and water pipe connections
- General Metal Fabrication: Joining copper, steel, cast iron and dissimilar metal combinations in mechanical workshops
- Electrical Industry: Brazing copper busbars, connectors and low-voltage electrical components
Chemical Composition of Deposited Metal(%)
| Cu | Sn | Si | Al | Pb | Impurity Elements |
| 56-62 | 0.5-1.5 | 0.1-0.5 | ≤0.01 | ≤0.05 | ≤0.5 |
Correct Welding Guidelines
To ensure optimal performance of HS221 solder, please follow these proven operating recommendations:
- Pre-treatment: Before welding, thoroughly remove oil, rust, oxide layers, and impurities from the workpiece surface and brazing electrode.
- Preheating: Preheat the base material to 400°C – 500°C before applying the filler metal.
- Flame conditioning: When performing oxyacetylene brazing, a neutral flame or a slightly oxidizing flame should be used, and overheating should be avoided.
- Flux Recommendation: For copper alloy, steel and cast iron workpieces, please use a suitable copper brazing flux to improve wetting performance.
- Rapid operation: The brazing process is completed quickly and in the shortest possible time to reduce zinc volatilization and prevent excessive oxidation.
- Post-weld Treatment: After welding, remove residual flux and slag using hot water to prevent surface corrosion.
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