| 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 known as "Naval Brass") - A time-tested material favored for its exceptional performance in demanding environments.
Material Type: Copper-Zinc alloy (Cu-Zn-Sn system) with added tin for enhanced corrosion resistance - a robust choice for superior durability.
Key Use: Joining copper alloys, steel, and cast iron where seawater/chemical corrosion resistance is critical - ensuring longevity in harsh conditions.
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): Improves seawater dezincification resistance - a key factor for longevity in marine applications.
Fe (Iron): Enhances strength and wear resistance - vital for the durability of welded joints.
Low Pb/Si: Minimizes hot cracking during welding - ensuring seamless and robust connections.
As-Deposited:
Tensile Strength: 410-510 MPa - offering substantial resistance to tensile forces.
Hardness: 85-105 HB - ensuring a solid and resilient surface.
Melting Range: 885-900°C (solidus-liquidus) - providing a wide thermal processing window.
Corrosion Resistance: Excellent in seawater, marine atmospheres, and mild acids/alkalis - ideal for environments where other materials fail.
Marine Engineering: Ship propellers, seawater piping, condenser tubes - pivotal components of marine structures.
Industrial: Heat exchangers, pump components, valve bodies - essential for industrial fluid handling and processing.
Repair: Joining/building up manganese bronzes and high-tensile brasses.
Process Compatibility:
Oxy-Acetylene Welding (OAW): Preferred for cast iron repairs - ensuring high-quality bonds in challenging materials.
Gas Tungsten Arc Welding (GTAW/TIG): For precision joints (use DCEN polarity) - ideal for creating intricate and precise welds.
Parameters:
Flux Requirement: AWS Type FB3-A or borax-based flux (mandatory to prevent oxidation) - critical for pristine weld quality.
Preheat: 150-260°C (for thick sections/cast iron) - optimizing material readiness and consistency.
Interpass Temp.: ≤200°C to avoid Zn fuming - essential for maintaining a safe and efficient welding atmosphere.
Zinc Fume Hazard: Employ effective control measures such as local exhaust ventilation (LEV) and ensure the use of OSHA-approved respirators to maintain a safe working environment.
Storage: Store in sealed containers with less than 40% humidity to effectively prevent oxidation and maintain the product's superior quality.
Form Availability: Available in convenient forms such as rods with diameters ranging from 3-6 mm and in coil form 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 nickel alloys. It should be used exclusively for Cu-Zn base metals or in dissimilar joints that demand seawater resistance, ensuring optimal performance.
For complete specifications, please refer to AWS A5.8:2021 (Specification for Brazing Filler Metals) for authoritative guidance..
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