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ER4043 Aluminum Welding for Heat Exchangers

-- Steady & Reliable Manufacturer --

Thermal System Integrity

Heat exchangers (intercoolers, oil coolers) require thin-gauge welding of fins and tubes, often using 3003 or 6063 alloys. ER4043 is preferred because its melting point (573∘C) is lower than the 3003 base metal (640∘C), providing a "safety margin" against burn-through. The high Silicon content ensures the weld bead is exceptionally smooth, which is critical for maintaining laminar airflow and preventing turbulence or pressure drops across the heat exchanger surface.

DB Certification CE Certification ABS Certification DNV Certification CCS Certification

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20+ Years Experience

Over two decades of aluminum alloy wire production expertise

International Certifications

DB, CE, ABS, DNV, CCS and other authoritative certifications

200MT Monthly Capacity

Large-scale production with consistent quality

Global Export

Exporting to over 30 countries worldwide

Cooling the Future

Our company is at the forefront of thermal management technology. As industrial and automotive cooling needs become more complex, our ER4043 wire provides the reliability needed for complex multi-pass heat exchanger assemblies. We focus on "Zero-Leak" performance. Our wire is manufactured under vacuum-melt conditions to eliminate hydrogen inclusions, ensuring that every heat exchanger we help build can withstand years of high-pressure thermal cycling without failure.

Heat Exchanger Specs

Corrosion Resist.Excellent (in air/coolant)
Leak Rate (He)<1×10−8 mbar⋅l/s
Ductility≥10% Elongation
Viscosity (Molten)Very Low (High Fluidity)
Operating Press.Capable of 200+ PSI

Heat Exchanger Solutions

  • Charge Air Coolers (Intercoolers): Welding 6061 end tanks to 3003 cores.

  • Industrial Chillers: Fabrication of large aluminum cooling coils for HVAC systems.

  • EV Battery Cooling Plates: Precision welding of thin-wall aluminum extrusions for battery thermal management.

  • Solution: Achieving airtight seals on 0.8 mm fins using micro-pulse TIG and ER4043 filler rods.

Heat Exchanger FAQ

  • Q: Can I use 4043 for brazing instead of welding?A: While 4043 is a welding wire, ER4047 is the preferred choice for brazing due to its lower melting point (577∘C vs 630∘C).
  • Q: Is it resistant to glycol-based coolants?A: Yes, ER4043 is highly stable in standard automotive and industrial coolants.

Core Advantages

  • Leak-Free Joints: The "eutectic-like" flow ensures that micro-cracks are filled during solidification.

  • Thin-Wall Friendly: Allows for faster travel speeds, reducing the total heat input into delicate fins.

  • Vibration Resistance: The ductile nature of the Si-Al matrix absorbs mechanical vibrations from fans and pumps.

  • Smooth Transitions: Minimizes the "step" between tube and header, reducing stress concentrations.

Selection Guide

For Heat Exchangers, specify ER4043 for the End-Tank-to-Core joints. If the design requires ultra-thin brazing of fins, we recommend stepping up to our ER4047 series for better capillary action.

About Us

Coming From China, Marketing To The World.

Hangzhou Kunli welding materials Co., Ltd. is China ER4043 Aluminum Welding for Heat Exchangers Manufacturers and Wholesale ER4043 Aluminum Welding for Heat Exchangers OEM/ODM Suppliers. We are located in the industrial zone of Puyang Town, Xiaoshan District, Hangzhou, Zhejiang Province. It is a high-technology enterprise specializing in the research, development and manufacturing of high-performance. The company has more than 20 years of aluminum alloy wire production experience, with international advanced manufacturing equipment, complete testing equipment,stable production process and strict quality control system.
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