Customization: | Available |
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Type: | Rolling Wire |
Material: | CO2 |
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RBCuZn-D Brass Welding/Brazing Filler Metal: An Expert's Technical Summary
AWS A5.8 Designation: RBCuZn-D (historically revered as 'Naval Brass')
Material Type: A sophisticated Copper-Zinc alloy (Cu-Zn-Sn system), thoughtfully infused with tin to significantly boost corrosion resistance.
Key Use: Ideal for joining copper alloys, steel, and cast iron in environments where protection against seawater or chemical corrosion is paramount.
Table 1: Detailed 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): Boosts resistance to seawater-driven dezincification.
Fe (Iron): Contributes to enhanced strength and superior wear resistance.
Low Pb/Si: Key in minimizing hot cracking risks during welding.
As-Deposited:
Tensile Strength: Ranges from 410-510 MPa, ensuring robust performance.
Hardness: An impressive 85-105 HB for enduring applications.
Melting Range: 885-900°C, offering a precise solidus-liquidus transition.
Corrosion Resistance: Exhibits exceptional resilience in seawater, marine atmospheres, and when exposed to mild acids or alkalis.
Marine Engineering: Perfect for crafting ship propellers, seawater piping, and condenser tubes, delivering unmatched durability.
Industrial: Essential for heat exchangers, pump components, and valve bodies, ensuring optimal functionality.
Repair: Suited for joining or building up manganese bronzes and high-tensile brasses, providing robust repair solutions.
Process Compatibility:
Oxy-Acetylene Welding (OAW): Highly recommended for effective cast iron repairs.
Gas Tungsten Arc Welding (GTAW/TIG): Ideal for precise joints, utilizing DCEN polarity for optimal results.
Parameters:
Flux Requirement: Mandated use of AWS Type FB3-A or borax-based flux to prevent oxidation and ensure quality.
Preheat: Recommended 150-260°C, especially for thick sections or cast iron, to achieve best outcomes.
Interpass Temp.: Keep ≤200°C to effectively avoid Zn fuming.
Zinc Fume Hazard: A Priority for Safety: Ensure the utmost safety by utilizing state-of-the-art local exhaust ventilation (LEV) systems along with OSHA-approved respirators to protect against zinc fume exposure.
Optimal Storage Guidelines: Store in sealed containers with humidity levels below 40% to effectively prevent oxidation and maintain product integrity.
Versatile Form Availability: Available in rods ranging from 3 to 6 mm in diameter, as well as in convenient coil form to suit diverse welding applications.
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: Essential Usage Clarification:
RBCuZn-D is distinctly 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 that demand exceptional seawater resistance.
For comprehensive specifications and detailed guidelines, refer to AWS A5.8:2021 (Specification for Brazing Filler Metals).