| 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 (formerly acclaimed as the robust "Naval Brass")
Material Type: A high-grade Copper-Zinc alloy (Cu-Zn-Sn system) masterfully engineered with tin for superior corrosion resistance.
Key Use: Expertly crafted for joining copper alloys, steel,and cast iron, particularly where exceptional seawater and chemical corrosion resistance is paramount.
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): Augments seawater resistance by counteracting dezincification.
Fe (Iron): Significantly bolsters strength and enhances wear resistance.
Low Pb/Si: Effectively reduces the risk of hot cracking during welding operations.
As-Deposited:
Tensile Strength: 410-510 MPa, indicative of outstanding durability.
Hardness: 85-105 HB, reflecting its robust structural integrity.
Melting Range: A precise 885-900°C (solidus-liquidus) for optimal processing.
Corrosion Resistance: Exemplary in seawater, marine atmospheres,and through mild acids/alkalis.
Marine Engineering: Essential for ship propellers, seawater piping, and condenser tubes.
Industrial: Vital in heat exchangers, pump components, and valve bodies.
Repair: Ideal for joining and building up manganese bronzes and high-tensile brasses.
Process Compatibility:
Oxy-Acetylene Welding (OAW): Highly recommended for precise repairs of cast iron.
Gas Tungsten Arc Welding (GTAW/TIG): Ideal for precision joints using DCEN polarity for superior results.
Parameters:
Flux Requirement: Utilize AWS Type FB3-A or borax-based flux to effectively prevent oxidation.
Preheat: Maintain at 150-260°C, especially for dense sections or cast iron.
Interpass Temp.: Keep ≤200°C to sidestep Zn fuming and ensure quality.
Zinc Fume Hazard: Ensure you prioritize safety by implementing local exhaust ventilation (LEV) and using only OSHA-approved respirators to mitigate zinc fume exposure.
Storage: Store in sealed containers with humidity levels kept below 40% to effectively prevent oxidation and maintain product integrity.
Form Availability: Available in convenient forms such as rods with diameters ranging from 3-6 mm, and also in coils, to suit 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 silicon bronzes (e.g., ERCuSi-A) or nickel alloys. This specialized filler is designed exclusively for Cu-Zn base metals or for dissimilar joints that demand exceptional seawater resistance.
For comprehensive specifications and detailed guidelines, please refer to AWS A5.8:2021 (Specification for Brazing Filler Metals).
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