Quality RBCuZn-D Copper Alloy Welding Rod for Lasting Performance

• Customization: Available
• Type: Rolling Wire
• Material: CO2
• Model NO.: RBCuZn-D
• Flux Containing: Not Containing Flux
• Slag Characteristic: Acidic
• Extended Length: >20mm
• Transport Package: 1kg/5kg/12.5/15kg/Spool
• Specification: 0.6/0.8/1.0/1.2/1.6/2.0/3.2/4.0mm
• Trademark: Jiuzhou
• Origin: China
• HS Code: 7223000
• Production Capacity: 200000kg/Year

Product Description

RBCuZn-D Brass Welding/Brazing Filler Metal: Technical Summary

1. Classification & Overview

• AWS A5.8 Designation: RBCuZn-D (formerly known as "Naval Brass")

• Material Type: Copper-Zinc alloy (Cu-Zn-Sn system) with added tin for enhanced corrosion resistance.

• Key Use: Joining copper alloys, steel, and cast iron where seawater/chemical corrosion resistance is critical.

2. Chemical Composition

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.

• Fe (Iron): Enhances strength and wear resistance.

• Low Pb/Si: Minimizes hot cracking during welding.

3. Mechanical Properties

• As-Deposited:

  • Tensile Strength: 410-510 MPa

  • Hardness: 85-105 HB

  • Melting Range: 885-900°C (solidus-liquidus)

• Corrosion Resistance: Excellent in seawater, marine atmospheres, and mild acids/alkalis.

4. Applications

• Marine Engineering: Ship propellers, seawater piping, condenser tubes.

• Industrial: Heat exchangers, pump components, valve bodies.

• Repair: Joining/building up manganese bronzes and high-tensile brasses.

5. Welding & Brazing Guidelines

• Process Compatibility:

  • Oxy-Acetylene Welding (OAW): Preferred for cast iron repairs.

  • Gas Tungsten Arc Welding (GTAW/TIG): For precision joints (use DCEN polarity).

• Parameters:

  • Flux Requirement: AWS Type FB3-A or borax-based flux (mandatory to prevent oxidation).

  • Preheat: 150-260°C (for thick sections/cast iron).

  • Interpass Temp.: Maintain temperatures ≤200°C to effectively avoid the risk of zinc fuming, ensuring a safe and efficient welding environment.

6. Handling & Safety

• Zinc Fume Hazard: Employ local exhaust ventilation (LEV) systems and ensure the use of OSHA-approved respirators to protect against potential zinc fumes.

• Storage: Store in sealed containers with humidity levels below 40% to meticulously prevent oxidation and maintain product integrity.

• Form Availability: Available in practical forms including rods with diameters ranging from 3 to 6 mm and convenient coils, catering to diverse welding needs.

7. Comparison to Similar Fillers

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. It is exclusively designed for Cu-Zn base metals or for dissimilar joints requiring exceptional seawater resistance.

For full specifications, refer to AWS A5.8:2021 (Specification for Brazing Filler Metals), which provides comprehensive guidelines..