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er4043 aluminum mig filler wire

-- Steady & Reliable Manufacturer --

Technical Filler Metallurgy

As a filler metal, ER4043 is the most common Al-Si alloy used in the global market. Its metallurgy focuses on Solidification Range Management. By having a lower melting point than most parent alloys, it remains liquid longer, allowing for the relief of shrinkage stresses. This makes it particularly effective for welding 6061 and 6063 extrusions, which are otherwise prone to hot-cracking if welded with 4043's magnesium-based counterparts.

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

The Global Standard for Fillers

We provide the filler metal that keeps the world’s aluminum structures together. ER4043 is the backbone of aluminum fabrication, and our version is engineered for superior purity. We recognize that in professional manufacturing, the filler metal is the critical link. By ensuring a consistent 5% silicon content and ultra-clean wire surfaces, we help our customers achieve high-integrity welds that pass both visual and mechanical testing every time.

Filler Tech Specs

Solidus Temp.575∘C
Liquidus Temp.630∘C
Weld ColorSilvery-Bright (As welded)
ComplianceAWS A5.10 / CWB Approved

Filler Scenarios

  • Extrusion Joining: Welding architectural window and door frames.

  • Tack-Welding: High-speed tacking of components before final assembly.

  • Cast-to-Wrought: Joining aluminum castings to extruded tubes or plates.

  • Solution: Reducing weld-joint failure in complex 6XXX series assemblies.

Professional FAQ

  • Q: Can I use 4043 for high-temperature service?A: No. It is not recommended for sustained temperatures above 65∘C (150∘F).

Key Advantages

  • High Cracking Resistance: Silicon creates a "filling" effect during cooling.

  • Excellent Aesthetics: Smooth bead profile with high luster.

  • Low Arc-Erosion: Extends the life of contact tips and gas nozzles.

Selection Guide

For 6XXX Series Extrusions, use ER4043. For 5XXX Series Plates, use ER5356.

About Us

Coming From China, Marketing To The World.

Hangzhou Kunli welding materials Co., Ltd. is China er4043 aluminum mig filler wire Manufacturers and Wholesale er4043 aluminum mig filler wire 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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