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Aluminum Alloy Wire for Heat Exchanger

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Intro

Precision aluminum filler wire designed for the high-volume, automated joining of thin-walled aluminum tubes and fins in the manufacturing of heat exchangers and HVAC/R coils.

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Introduction

The construction of modern heat exchangers (used in automotive HVAC, refrigeration, and industrial cooling) requires filler metal that delivers precise heat control and excellent flow characteristics on thin-gauge materials. Our wire for this application is typically small in diameter (0.8mm-1.2mm) and based on Al-Si alloys like ER4043, which are optimized for low-amperage, high-speed welding. The wire features superior cleanliness to minimize porosity and ensure leak-tight joints, which is crucial for pressure-containing heat exchange systems.

Specification

Key PropertyExcellent fluidity, Low melting point, High cleanliness
Material FocusER4043 (Al-Si), and specialized Al-Si-Mn alloys
DiameterTypically 0.8mm, 1.0mm, and 1.2mm for thin gauge
Process FocusPulsed MIG, High-speed robotic welding
IntegrityGuaranteed low porosity for pressure integrity

Applications

  • Robotic welding of automotive radiators and condensers.

  • Assembly and repair of aluminum evaporator and condenser coils for HVAC/R units.

  • Joining of micro-channel plates and tubing in specialized industrial heat recovery systems.

  • Brazing/welding repairs on aluminum HVAC/R systems where low-temperature flow is critical.

FAQ

  • Q: Why is ER4043 often preferred over ER5356 for heat exchangers?
  • A: ER4043 (Al-Si) has a lower melting temperature and superior fluidity, which is ideal for welding thin-gauge components and cast aluminum parts, minimizing the risk of burn-through.
  • Q: How do you prevent porosity in wire used for pressure-critical welds?
  • A: We utilize multi-stage chemical cleaning, rigorous deoxidation during production, and immediate vacuum/moisture-proof sealing to minimize surface oxides and trapped moisture (a source of hydrogen porosity).

Advantages

  • Leak-Tight Guarantee: Superior cleanliness and consistent chemistry minimize porosity, ensuring the final product meets strict leak-testing standards.

  • Thermal Management: Al-Si alloys offer excellent flow and wetting, essential for creating strong, efficient joints that optimize heat transfer.

  • Automation Ready: Precision layer winding and small diameter wire ensures smooth feeding through complex robotic welding equipment, maximizing line uptime.

  • Corrosion Resistance: Final joints possess the necessary corrosion resistance for long-term use in humid, demanding environments (e.g., HVAC).

Payment and Shipping

  • Sample Testing: Availability of sample spools for testing on customer-specific heat exchanger welding rigs.

  • Logistics: High-volume bulk packaging (drums) to support large-scale automotive and HVAC manufacturing lines.

  • Technical Support: Collaboration on optimizing wire feed speed and amperage for specific material thicknesses.

About Us

Coming From China, Marketing To The World.

Hangzhou Kunli welding materials Co., Ltd. is China Aluminum Alloy Wire for Heat Exchanger Manufacturers and Wholesale Aluminum Alloy Wire for Heat Exchanger 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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