| 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 revered as the robust 'Naval Brass')
Material Type: Copper-Zinc alloy (Cu-Zn-Sn system) expertly enriched with tin to significantly boost corrosion resistance.
Key Use: Optimal for Joining a variety of copper alloys, steel,and cast iron especially where resilience against seawater or chemical corrosion is crucial.
Table 1: Composition (in 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 seawater dezincification resistance.
Fe (Iron): Boosts overall strength and wear resistance.
Low Pb/Si: Effectively minimizes hot cracking during welding processes.
As-Deposited:
Tensile Strength: A robust 410-510 MPa
Hardness: An impressive 85-105 HB
Melting Range: 885-900°C, from solidus to liquidus
Corrosion Resistance: Demonstrates excellence in seawater, marine atmospheres,and mild acids/alkalis.
Marine Engineering: Ideal for ship propellers, seawater piping, and condenser tubes.
Industrial: Suitable for heat exchangers, pump components, and valve bodies.
Repair: Perfect for joining/building up manganese bronzes and high-tensile brasses.
Process Compatibility:
Oxy-Acetylene Welding (OAW): Highly recommended for cast iron repairs.
Gas Tungsten Arc Welding (GTAW/TIG): Ideal for precision joints with DCEN polarity.
Parameters:
Flux Requirement: AWS Type FB3-A or borax-based flux is mandatory to effectively prevent oxidation.
Preheat: 150-260°C, especially for thick sections or cast iron.
Interpass Temp.: Keep ≤200°C to avoid harmful Zn fuming.
Zinc Fume Hazard: To ensure a safe working environment, employ local exhaust ventilation (LEV) and use OSHA-approved respirators to protect against zinc fumes, enhancing safety during welding processes.
Storage: Preserve the integrity of the product by using sealed containers and maintaining humidity levels below 40% to effectively prevent oxidation.
Form Availability: Available in versatile forms such as rods with diameters ranging from 3 to 6 mm and convenient coils, catering to various welding 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 alternatives like silicon bronzes (for instance, ERCuSi-A) or nickel alloys. It is uniquely suited for Cu-Zn base metals or specialized dissimilar joints where superior seawater resistance is required.
For full specifications, refer to AWS A5.8:2021 (Specification for Brazing Filler Metals).
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