| Customization: | Available |
|---|---|
| Type: | Rolling Wire |
| Material: | CO2 |
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RBCuZn-D Brass Welding/Brazing Filler Metal: Technical Summary
AWS A5.8 Designation: RBCuZn-D, previously known as 'Naval Brass', is a renowned designation.
Material Type: This is a sophisticated Copper-Zinc alloy (Cu-Zn-Sn system), enhanced with tin to bolster its resilience against corrosion.
Key Use: Ideal for joining copper alloys, steel, and cast iron in environments where safeguarding against seawater and chemical corrosion is paramount.
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): Added to significantly improve resistance against dezincification in seawater.
Fe (Iron): Included to strengthen and enhance wear resistance properties.
Low Pb/Si: Helps to minimize the risk of hot cracking during welding processes.
As-Deposited:
Tensile Strength: Ranges between 410 and 510 MPa, offering robust durability.
Hardness: Measures between 85 and 105 HB, ensuring dependable strength.
Melting Range: Has a melting range of 885-900°C (solidus-liquidus), suitable for various applications.
Corrosion Resistance: Exhibits excellent resistance in seawater, marine atmospheres, and environments with mild acids or alkalis.
Marine Engineering: Commonly used for ship propellers, seawater piping, and condenser tubes, ensuring longevity and performance.
Industrial: Perfect for heat exchangers, pump components, and valve bodies where reliability is key.
Repair: Ideal for joining and building up manganese bronzes and high-tensile brasses, offering versatility across various repair settings.
Process Compatibility:
Oxy-Acetylene Welding (OAW): Preferred choice for effective repairs on cast iron.
Gas Tungsten Arc Welding (GTAW/TIG): Recommended for precision joints, using DCEN polarity to ensure quality.
Parameters:
Flux Requirement: Use AWS Type FB3-A or borax-based flux mandatorily to prevent oxidation and ensure clean results.
Preheat: Required at 150-260°C especially for thicker sections or cast iron to ensure proper bonding.
Interpass Temp.: Should be maintained at ≤200°C to prevent Zn fuming, preserving weld integrity.
Zinc Fume Hazard: Ensure optimal safety measures by utilizing local exhaust ventilation systems (LEV) and equipping yourself with OSHA-approved respirators to effectively mitigate zinc fume hazards.
Storage: Maintain product integrity by storing in sealed containers with humidity levels below 40% to effectively prevent oxidation and preserve material quality.
Form Availability: Available in precision-engineered rods ranging from 3 to 6 mm in diameter, as well as convenient coils for versatile application needs.
| 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 like ERCuSi-A or various nickel alloys. It is specifically designed for use with Cu-Zn base metals or dissimilar joints that necessitate unparalleled seawater resistance.
For full specifications, refer to AWS A5.8:2021 (Specification for Brazing Filler Metals).
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