| Customization: | Available |
|---|---|
| Type: | Rolling Wire |
| Material: | CO2 |
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RBCuZn-D Brass Welding/Brazing Filler Metal: An In-Depth Technical Summary
AWS A5.8 Designation: RBCuZn-D, a high-quality alloy formerly recognized as 'Naval Brass'
Material Type: An advanced Copper-Zinc alloy (Cu-Zn-Sn system) enriched with tin to significantly boost corrosion resistance.
Key Use: Expertly crafted for joining copper alloys, steel, and cast iron where superior resistance to seawater and 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): Crucial for enhancing resistance against seawater dezincification.
Fe (Iron): Adds significant strength and bolsters wear resistance.
Low Pb/Si: Effectively reduces the risk of hot cracking during welding processes.
As-Deposited:
Tensile Strength: Ranges between 410-510 MPa, ensuring robust metal joins.
Hardness: Between 85-105 HB, offering durability and resilience.
Melting Range: 885-900°C (solidus-liquidus), facilitating a smooth and efficient welding process.
Corrosion Resistance: Exceptional performance in seawater, marine atmospheres, and environments with 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: Excellent for joining and building up manganese bronzes and high-tensile brasses.
Process Compatibility:
Oxy-Acetylene Welding (OAW): Highly recommended for precise cast iron repairs.
Gas Tungsten Arc Welding (GTAW/TIG): Optimal for precision joints utilizing DCEN polarity.
Parameters:
Flux Requirement: AWS Type FB3-A or borax-based flux is essential to prevent oxidation and ensure clean welds.
Preheat: Maintain at 150-260°C, particularly for thick sections and cast iron.
Interpass Temp.: Keep at ≤200°C to effectively avoid Zn fuming complications.
Zinc Fume Hazard: Ensure a safe working environment by employing robust local exhaust ventilation systems (LEV) and utilizing OSHA-approved respirators to effectively mitigate zinc fume exposure.
Storage: Store in sealed containers maintaining humidity levels below 40% to impeccably preserve the welding rods and prevent any oxidation concerns.
Form Availability: Available in versatile forms: rods ranging from 3 to 6 mm in diameter, as well as convenient coil options.
| 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 such as silicon bronzes (e.g., ERCuSi-A) or nickel alloys. It is crafted specifically for Cu-Zn base metals or for joints needing superior seawater resistance.
For full specifications, refer to AWS A5.8:2021, the authoritative Specification for Brazing Filler Metals, for comprehensive guidelines.
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