In the field of copper and copper alloy welding, joining pure copper, brass, and bronze requires strict control over the rod's melting point, joint tightness, and oxidation resistance. The Ocean Welding HS221 Copper Alloy Welding Rod from Zhejiang, China – with a copper-tin core matrix and flux-compatible design – stands out as a top choice for oxy-acetylene flame brazing, thanks to its low melting point, easy operability, and high joint strength. Its ISO 9001 certification and stable composition ratio further ensure consistent and reliable welding quality.
1. Product Positioning & Basic Features
HS221 is essentially a copper-tin alloy brazing rod, primarily designed to enable efficient joining of copper and copper alloys – especially for medium-to-low temperature brazing scenarios requiring easy weldability and tight joints. Its basic features fully cover mainstream copper welding needs:
- Core Attributes: Made of copper-tin alloy (copper as main component, tin as auxiliary), with a melting point of 600-650℃. Suitable for oxy-acetylene flame brazing; must be used with copper alloy-specific flux (removes base material oxide films and improves filler metal wettability).
- Specification Options: Available in four common diameters (1.6mm, 2.0mm, 2.4mm, 3.2mm); uniform length of 400mm/500mm (customizable on demand), suitable for welding thin-walled copper pipes to medium-thick copper components.
- Quality Assurance: Branded as Ocean Welding (produced in Zhejiang), certified by ISO 9001 Quality Management System. The rod surface is free of oxidation and impurities, ensuring smooth wire feeding and fewer welding defects.
2. Core Technical Parameters & Welding Key Points
HS221's reliable performance comes from precise composition control and adaptive welding processes, which together maximize copper welding efficiency and joint quality.
1. Key Parameters of Deposited Metal
| Category | Specific Indicators | Function Description |
|---|---|---|
| Chemical Composition (%) | Cu ≥80, Sn 5-8, Zn ≤5, S ≤0.05, P ≤0.05 | Cu ensures basic strength and conductivity; Sn lowers melting point and optimizes fluidity; strict S/P control avoids joint brittleness. |
| Mechanical Properties | Joint tensile strength ≥200MPa | Prevents welded copper components from breaking under stress, meeting daily load requirements. |
| Temperature Resistance Range | Long-term operating temperature ≤200℃ | Suitable for medium-to-low temperature scenarios (e.g., refrigeration, electrical), with excellent aging resistance. |
2. Core Welding Key Points
- Base Material Preparation: Before welding, clean oil and oxide films from the copper surface (using sandpaper or special cleaning agents) to avoid porosity caused by impurities.
- Heating Control: Use an oxy-acetylene "neutral flame" for heating; control temperature at 650-700℃ (copper surface turns dark red) to prevent copper deformation from overheating.
- Flux Usage: Apply flux evenly to the weld joint. After the flux melts and covers the joint, feed the HS221 rod to ensure full gap filling with filler metal.
3. Application Scenarios: Focus on Copper & Copper Alloy Joining
With high compatibility for copper materials, HS221 is widely used in copper welding scenarios across industries to solve core component joining challenges:
- Refrigeration & HVAC: Butt welding of pure copper pipes in air conditioners/refrigerators, and sealed welding of brass valves to copper pipes – requiring joint tightness (to prevent refrigerant leakage) and conductivity.
- Electrical Equipment: Joining of copper busbars in power distribution cabinets, and welding of copper terminals in transformers – relying on the rod's low electrical resistance for stable current transmission.
- Hardware & Sanitary Ware: Splicing of brass faucet parts and welding of bronze pipe fittings – meeting both decorative and functional needs.
- Copper Component Repair: Repair of sandholes in copper alloy castings and reinforcement of joints in old copper equipment – reducing replacement costs and extending equipment service life.
4. Packaging, Delivery & Cooperation Support
To meet the needs of customers of different scales, Ocean Welding provides standardized packaging and flexible services to ensure supply chain stability:
- Packaging Solution: 1kg per plastic box (inner layer, moisture-proof) + 20kg per carton (outer layer, anti-pressure). Can be stored for 12 months in a cool, dry place to prevent rod oxidation.
- Delivery Efficiency: Minimum Order Quantity (MOQ) is 5kg; delivery within 20 days after order confirmation. Supports shipping from Ningbo/Shanghai ports, with HS code 8311200000 for global export.
- Cooperation Support: Offers free sample testing (customizable specifications); provides welding process guidance (parameter adjustment, defect troubleshooting); and supplies English material reports for overseas customers.
5. Core Advantages: Why Choose HS221?
Compared with ordinary copper rods, HS221's competitiveness lies in three key aspects, effectively addressing copper welding pain points:
- Low Operation Threshold: Low melting point (600-650℃) is easy to control, allowing beginners to master it quickly and reducing welding waste.
- Superior Joint Quality: Copper-tin alloy matrix with flux ensures no porosity and strong joint sealing, suitable for high-pressure and sealed scenarios.
- High Cost-Effectiveness: Direct supply from the source factory, 20-30% lower in price than imported copper rods; each batch has a composition error ≤1%, ensuring stable quality.
Whether for mass production of copper components or repair of scattered copper parts, Ocean Welding HS221 Copper Alloy Welding Rod – with its high adaptability and easy operability – serves as a reliable choice in the copper welding field, supporting customers in cost reduction and efficiency improvement.
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