ER4047 Welding Wire

Product Categories of ER4047 Aluminum Welding Wire

As a professional ER4047 aluminum alloy supplier, Chalco can provide you with various forms of welding wire. For detailed specifications or the latest quotations, please contact our expert team immediately!Quick Quote

Features of ER4047 Aluminum Welding Wire

ER4047 aluminum alloy is a high-silicon aluminum alloy (Si content 11–13%). This high silicon content gives it a low melting point and a narrow solidification range, resulting in excellent fluidity and crack resistance during welding/brazing. Its key alloy characteristics include:

• Excellent Welding Fluidity: The high silicon content (11–13%) enhances the fluidity of the molten weld pool, reducing porosity and lack of fusion, and achieving a smoother weld surface.
• Low Melting Point and Narrow Solidification Temperature Range: Its lower melting point (liquidus line approximately 577–582°C) and narrow solidification range minimize thermal stress concentration and post-weld deformation, effectively inhibiting hot cracking.
• Reduced Shrinkage: The high silicon content reduces the volume shrinkage of the alloy during solidification, improving the dimensional accuracy of welded parts and the strength of joints.
• Good High-Temperature Performance: It maintains stable performance in high-temperature environments and exhibits strong resistance to thermal fatigue and creep, making it suitable for applications such as heat exchangers and engine components.
• Aesthetic Welds: It can form bright, virtually soot-free weld surfaces, eliminating the need for subsequent grinding or cleaning processes.
• Significantly Reduced Hot Cracking Sensitivity: When welding base materials sensitive to hot cracking (such as the 6xxx series), using ER4047 filler can significantly reduce crack formation, ensuring weld integrity.
• Excellent Corrosion Resistance and Thermal Conductivity: It has good resistance to atmospheric and humid heat corrosion and is not prone to oxidation. Its thermal conductivity is approximately 130 W/m·K, meeting the application requirements for heat exchange and electronic heat dissipation.

Application Fields of ER4047 Aluminum Welding Wire

Why Choose Chalco?

Among many suppliers, Chalco ER4047 welding wire helps your projects proceed efficiently and ensures quality with the following four core advantages:

• Globally Certified Quality Production Lines: The factory is certified by ISO 9001 and IATF 16949 dual quality management systems, with an annual production capacity of 8, 000 tons and full batch traceability.
• Ultra-High Precision and Moisture Protection: Wire drawing tolerance is strictly controlled within ±0.02 mm. Before leaving the factory, it undergoes vacuum drying and degassing, and is then packaged in aluminum foil composite bags to ensure long-term storage without moisture absorption.
• Ultra-Fast Delivery Capability: Common wire diameters ranging from Ø 0.8–4.0 mm are in stock, with a minimum order quantity starting from S100 (0.5 kg). All in-stock items are shipped to your door within 72 hours.
• One-Stop Technical Support: Enjoy 24-hour response from engineers upon placing an order, providing exclusive welding parameter guidance, base material comparison test plates, and COA/COC reports, truly achieving "online ordering, offline worry-free."

Click the "Get a Sample" button on the right to let our professional team quickly customize an ER4047 welding solution for you.Get sample

Technical Reference for ER4047 Aluminum Welding Wire

Chemical Composition of ER4047 Aluminum Welding Wire

ER4047 aluminum alloy's primary alloying element is silicon, with trace amounts of iron, copper, zinc, manganese, and magnesium. This composition provides it with stable performance in oxidizing and high-temperature environments.

Welding Positions for ER4047 Aluminum Welding Wire

ER4047 supports all-position welding (except for specialized vertical-down in-furnace welding). The six common posture diagrams are shown below:

Typical Mechanical Properties of ER4047 GTAW Butt Joint Welds

ER4047 Aluminum Welding Wire MIG Reference Process Parameters

When using ER4047 aluminum, precise control of welding parameters is crucial for achieving high-quality joints and minimizing defects. Its high silicon content (11-13%), excellent fluidity, and low shrinkage make it ideal for various welding applications. Below are specific parameters:

ER4047 vs ER4043 vs 4943 – Selection Comparison of Aluminum-Silicon Filler Wires

• If you require airtight brazing, thin-walled heat exchangers, or crack-sensitive castings, choose ER4047.
• If you require general structural/decorative welding, cost sensitivity, and minimal color difference, consider ER4043.
• If you require high-strength 6xxx series or structural components needing PWHT for strength recovery, ER4047 can be an option for the root pass with a cap of ER4943 or ER5356.

Still hesitating? Tell me the base material grade, thickness, and target strength, and Chalco engineers will provide exclusive filler wire recommendations and welding parameter guidance within 24 hours.Quick Quote

FAQ

How to choose between ER4047 and ER4043?

If your main applications involve 6xxx thin plates, heat exchanger furnace brazing, or casting crack repair, requiring high fluidity and low cracking rate – ER4047 is your first choice. If it's mainly general structural or decorative welding and you are sensitive to the color difference after anodizing, you can continue to use the lower-cost and lighter-colored ER4043. If you are still unsure, tell us the base material grade and thickness, and our engineers will provide a recommendation within 24 hours.

The ER4047 weld will turn dark gray after anodizing. Can this be solved?

The high silicon content of ER4047 determines its dark gray undertone after anodizing. There are three common solutions:

• Backside or corner welding – the weld is not on the visible surface.
• Overall re-spraying or powder coating after anodizing.
• Multi-pass process: use ER4047 for the root pass and overlay with 5356/4943 to match the base material color.

Chalco can provide color matching test plates and dual filler wire process guidance for your verification.

What is the minimum purchase quantity? Can I get a sample first?

Commonly stocked Ø 0.8–4.0 mm welding wires all support sampling of 1 S100 spool (0.5 kg) or 1 kg TIG straight rods; stock items can be shipped within 72 hours. Large volume orders can be customized with 150 kg large spools or 1 m TIG straight rods as needed.

Can ER4047 weld high-magnesium 5xxx or high-zinc 7xxx series alloys?

Not recommended. 5xxx series alloys with Mg >3% (such as 5083, 5456) and high-Zn 7xxx series alloys (such as 7075) are highly sensitive to hot cracking with Si-based welding wires. It is recommended to use ER5356/ER5556 or dedicated Zn-Mg based filler wires. If it is necessary to use ER4047, the risk can be reduced by preheating and using a dual-pass process. Please consult our technical team for details.

Is post-weld heat treatment necessary? Can the strength be recovered?

ER4047 is a non-heat-treatable strengthening alloy, so it can be put into use after welding without solution treatment and aging. For base materials such as 6061-T6, the joint strength is approximately 60-70% of the base material. If further strength improvement is needed, ER4047 can be used for the root pass of fillet welds to ensure airtightness, followed by an overlay of 4943 and short-term artificial aging.

How should ER4047 welding wire be stored? How long should it be used up after opening?

The welding wire is vacuum-dried and packaged before leaving the factory. It can be stored for 12 months in a storage environment with <60% RH and 15-25 °C. It is recommended to use it up within 30 days after opening. If the machine is stopped midway, it can be vacuum-sealed again or stored in a sealed container with 2 × silica gel desiccant packs to avoid moisture absorption leading to porosity.