| Customization: | Available |
|---|---|
| Type: | Rolling Wire |
| Material: | CO2 |
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RBCuZn-D Brass Welding/Brazing Filler Metal: A Comprehensive Technical Summary
AWS A5.8 Designation: RBCuZn-D, popularly known as the distinguished 'Naval Brass'
Material Type: A robust Copper-Zinc alloy (Cu-Zn-Sn system) expertly enhanced with tin for superior corrosion resistance.
Key Use: Seamlessly joining copper alloys, steel, and cast iron in environments demanding exceptional seawater and chemical corrosion resistance.
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): This element markedly improves resistance to seawater dezincification.
Fe (Iron): Vital for enhancing both strength and wear resistance.
Low Pb/Si: Carefully minimized to reduce the risk of hot cracking during welding.
As-Deposited:
Tensile Strength: Ranges from 410-510 MPa, ensuring durability.
Hardness: A robust 85-105 HB, perfect for demanding applications.
Melting Range: Stably positioned between 885-900°C (solidus-liquidus) for precise application.
Corrosion Resistance: Exhibits excellent resistance in seawater, marine atmospheres, and even mild acids/alkalis.
Marine Engineering: Ideal for ship propellers, seawater piping, and condenser tubes.
Industrial: Perfect for heat exchangers, pump components, and valve bodies.
Repair: Expertly suited for joining/building up manganese bronzes and high-tensile brasses.
Process Compatibility:
Oxy-Acetylene Welding (OAW): This method is preferred for effective cast iron repairs.
Gas Tungsten Arc Welding (GTAW/TIG): Ideal for precision joints, recommended with DCEN polarity.
Parameters:
Flux Requirement: AWS Type FB3-A or borax-based flux is mandatory to prevent oxidation.
Preheat: Recommended at 150-260°C, especially for thick sections or cast iron.
Interpass Temp.: Maintain ≤200°C to effectively avoid Zn fuming.
Zinc Fume Hazard: Ensure utmost safety by utilizing local exhaust ventilation (LEV) and only using OSHA-approved respirators to protect against any hazards.
Storage: Store in sealed containers with less than 40% humidity to effectively prevent any risk of oxidation.
Form Availability: Available in practical forms such as rods (3-6 mm diameter) and convenient coils to suit various 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 materials like silicon bronzes (e.g., ERCuSi-A) or nickel alloys. It is specifically designed for exclusive use with Cu-Zn base metals or unique dissimilar joints that require robust seawater resistance.
For full specifications, refer to AWS A5.8:2021 (Specification for Brazing Filler Metals),the comprehensive guideline for precise applications.
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