| 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 (formerly celebrated as "Naval Brass")
Material Type: A robust Copper-Zinc alloy (Cu-Zn-Sn system) enriched with tin, offering superior corrosion resistance.
Key Use: Seamlessly joining copper alloys, steel, and cast iron especially when combating seawater or chemical corrosion is crucial.
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): Elevates resistance to seawater-induced dezincification.
Fe (Iron): Bolsters strength and enhances wear resistance.
Low Pb/Si: Effectively reduces the risk of hot cracking during welding.
As-Deposited:
Tensile Strength: Ranges from 410-510 MPa, ensuring firm and resilient joints.
Hardness: Rated at 85-105 HB, striking a balance between durability and workability.
Melting Range: 885-900°C (solidus-liquidus), optimizing process efficiency.
Corrosion Resistance: Exhibits exceptional performance in seawater, marine atmospheres, and mild acids/alkalis, ensuring longevity.
Marine Engineering: Ideal for ship propellers, seawater piping, condenser tubes.
Industrial: Suitable for heat exchangers, pump components, valve bodies.
Repair: Perfect for joining/building up manganese bronzes and high-tensile brasses, ensuring structural integrity.
Process Compatibility:
Oxy-Acetylene Welding (OAW): Optimal for cast iron repairs, providing dependable results.
Gas Tungsten Arc Welding (GTAW/TIG): Suitable for precision joints; utilize DCEN polarity for best outcomes.
Parameters:
Flux Requirement: AWS Type FB3-A or borax-based flux is mandatory to prevent oxidation and ensure quality.
Preheat: Maintain 150-260°C for thick sections/cast iron to achieve optimal results.
Interpass Temp.: Keep ≤200°C to avoid Zn fuming, ensuring a safe and efficient process.
Zinc Fume Hazard: To ensure a safe working environment, employ local exhaust ventilation (LEV) systems and utilize OSHA-approved respirators for optimal protection.
Storage: Store in sealed containers with humidity levels below 40% to effectively prevent oxidation and maintain the quality of the welding wire.
Form Availability: Available in convenient rods with diameters ranging from 3 to 6 mm, as well as in coils, catering to diverse welding requirements.
| 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 such as ERCuSi-A or nickel alloys. It is specifically designed for exclusive use with Cu-Zn base metals or for dissimilar joints where seawater resistance is a critical requirement.
For full specifications, refer to AWS A5.8:2021 (Specification for Brazing Filler Metals).
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