| Customization: | Available |
|---|---|
| Type: | Rolling Wire |
| Material: | CO2 |
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RBCuZn-D Brass Welding/Brazing Filler Metal: A Comprehensive Technical Summary
AWS A5.8 Designation: RBCuZn-D, historically recognized as 'Naval Brass', renowned for its robust capabilities.
Material Type: Advanced Copper-Zinc alloy (Cu-Zn-Sn system) augmented with tin for superior corrosion resistance.
Key Use: Exceptional for Joining copper alloys, steel, and cast iron where protection against seawater and chemical corrosion is vital.
Table 1: Composition (Weight %)
| Cu | Zn | Sn | Fe | Pb | Si | Impurities |
|---|---|---|---|---|---|---|
| 58.0-61.0% | Rem. | 0.5-1.5% | 0.25-1.0% | ≤0.10% | 0.04-0.25% | ≤0.50% total |
Key Elements:
Sn (Tin): Significantly enhances resistance to seawater-induced dezincification.
Fe (Iron): Contributes to increased strength and wear resistance.
Low Pb/Si: Reduces the risk of hot cracking during the welding process.
As-Deposited:
Tensile Strength: Ranges between 410-510 MPa, ensuring durability.
Hardness: Measures at 85-105 HB, providing a robust finish.
Melting Range: Spans from 885-900°C (solidus to liquidus), offering a reliable melting window.
Corrosion Resistance: Exhibits exceptional durability in seawater, marine atmospheres, and in environments with mild acids or alkalis.
Marine Engineering: Ideal for ship propellers, seawater piping, and condenser tubes.
Industrial: Suitable for heat exchangers, pump components, and valve bodies.
Repair: Effective for joining/building up manganese bronzes and high-tensile brasses.
Process Compatibility:
Oxy-Acetylene Welding (OAW): Recommended for precise cast iron repairs.
Gas Tungsten Arc Welding (GTAW/TIG): Optimal for precision joints, utilizing DCEN polarity for best results.
Parameters:
Flux Requirement: AWS Type FB3-A or borax-based flux is essential to prevent oxidation.
Preheat: Maintain at 150-260°C for thicker sections and cast iron to ensure quality.
Interpass Temp.: Should not exceed 200°C to avoid zinc fuming.
Zinc Fume Hazard: Ensure your workspace is equipped with the utmost safety measures! Employ local exhaust ventilation (LEV) to effectively capture and remove hazardous fumes, and protect yourself with OSHA-approved respirators for an added layer of safety.
Storage: For optimal preservation, store in sealed containers maintained at less than 40% humidity to safeguard against oxidation and to maintain the wire's integrity.
Form Availability: Available in versatile forms to suit diverse welding requirements: rods with diameters ranging from 3 to 6 mm, as well as convenient coils.
| Filler | Composition | Key Use Case |
|---|---|---|
| RBCuZn-D | Cu-Zn-Sn-Fe | Marine corrosion resistance |
| RBCuZn-C | Cu-Zn-Si (no Sn/Fe) | General-purpose brazing |
| ERCuSn-A | Cu-Sn (phosphor bronze) | Bronze welding, bearings |
Critical Note:
RBCuZn-D is not interchangeable with silicon bronzes (e.g., ERCuSi-A) or nickel alloys. This specialized wire is to be used exclusively for Cu-Zn base metals or for crafting dissimilar joints that demand resistance to seawater. Its unique properties are tailored precisely for these specific applications.
For full specifications, refer to AWS A5.8:2021 (Specification for Brazing Filler Metals).
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