4047 Aluminum

4047 aluminum alloy, initially developed as a brazing alloy (BAlSi-4, 718), is exceptionally well-suited for diverse brazing applications due to its remarkably low melting point and narrow solidification range. Compared to 4043 aluminum alloy, 4047 boasts a higher silicon content (11.0-13.0%), which enhances its fluidity and reduces shrinkage.

Furthermore, 4047 aluminum produces bright, clean welds. When utilized as a filler alloy, it significantly minimizes hot cracking and exhibits excellent high-temperature stability, making it ideal for various high-temperature applications.Welcome to contact

As a professional 4047 aluminum alloy supplier, Chalco offers a wide range of product forms and specifications. Feel free to contact our technical team for further product details or quotation services!

Stock Size Range of 4047 Aluminum

Properties of 4047 Aluminum

4047 aluminum alloy is a high-silicon aluminum alloy (Si content 11–13%). This high silicon content provides it with 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 4047 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.

Chalco's 4047 Aluminum Product Categories

4047 Aluminum Sheet

Type: Bare

Temper: O, H14

Standard: ASTM B209, EN 485-2

Applications: Integrated circuit covers, electronic heat sink substrates, brazing carrier plates

4047 Aluminum Coil Strip

Temper: O

Standard: ASTM B209, EN 485-4

Applications: Automotive parts, heat exchangers, power battery electronic heat dissipation strips, brazing strips

4047 Aluminum Welding Wire

Type: Spool, Straight Lengths

Standard: AWS A5.10, AMS 4185

Applications: TIG/MIG welding filler, welding of 6xxx aluminum alloys, aluminum brazing materials

As a professional 4047 aluminum alloy supplier, Chalco can provide you with various product forms. For detailed specifications or the latest quotations, please contact our expert team immediately!Quick Quote

Application Fields of 4047 Aluminum

4047 aluminum alloy, with its excellent fluidity, low shrinkage, good corrosion resistance, and high-temperature stability, is widely used in various industries, mainly including:

4047 Cladding / Filler Materials

Cladding: Spraying or brazing a 4047 alloy layer onto the surface of easily worn or corroded metals enhances surface wear and corrosion resistance without significantly increasing weight.

Filler: Provides a uniform and dense filling layer for complex joints and thin-walled structures.

Sealing Joints

Used for sealing joints in pressure vessels, piping systems, and heat exchange equipment. The high fluidity of 4047 fills gaps, achieving excellent sealing performance and resistance to gas/liquid leakage.

Microwave Integrated Circuit Cladding & Laser Welded Covers

In the packaging of microwave integrated circuits (MIC) and high-frequency electronic devices, 4047 is used as a cladding alloy or laser brazing cover material, forming high-hermeticity, low-loss, and contamination-free metal packaging.

Aerospace Engineering

4047 is used in conjunction with magnesium alloys for brazing aircraft skins, fasteners, and connectors, providing superior heat and fatigue resistance. It can also be used as a brazing filler for engine tails and heat-resistant structural parts, reducing heat-related wear.

Automotive Engineering

Commonly used for brazing power battery electrode plates and welding and sealing various automotive heat exchange system components (such as radiators and condensers). Its excellent fluidity and low shrinkage characteristics ensure the high sealing performance and stability of battery packs and cooling modules.

Chemical Composition of 4047 Aluminum

4047 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.

Physical Properties of 4047 Aluminum

Mechanical Properties of 4047 Aluminum

Welding Parameters for 4047 Aluminum

When using 4047 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:

Processing Properties of 4047 Aluminum

Machining

It is recommended to use carbide cutting tools, preferably those with chip breakers, to avoid long chip entanglement and improve production efficiency. In the annealed state (O temper), the elongation can reach 10%–20%, resulting in smoother cutting. In the cold-worked state (H temper), the hardness increases to 50–80 HB Brinell, requiring more conservative machining parameters.

Low spindle speeds (≤800 rpm) and small feed rates (≤0.05 mm/rev) are recommended to reduce the risk of brittle fracture. The depth of cut should be controlled within 0.5 mm.

Welding and Brazing

4047 is more commonly used as a welding wire/filler material, while composite brazing layers often choose 4043 or 4343 series alloys.

The use of 100% Ar or Ar/He (75/25) mixed gas is suitable and can further enhance the molten pool protection, reducing oxidation and porosity. The silicon content (11%–13%) significantly reduces hot cracking sensitivity. The welding groove should maintain an appropriate gap (1–3 mm) to fully utilize its high fluidity.

Heat Treatment

4047 is not suitable for solution treatment and aging; its strength mainly depends on the alloy composition and work hardening. The O temper (annealed) exhibits the best plasticity. Cold-worked tempers such as H14/H16 can increase the tensile strength to approximately 180 - 200 MPa and the yield strength to approximately 100 - 120 MPa. If higher strength is required, light cold working can be performed after forming or extrusion, but plasticity and processing difficulty must be considered.

Comparison of 4047 Aluminum with Other Alloys

4047 vs. 4043 Aluminum

If pursuing ultimate fluidity, low shrinkage, and weld aesthetics, especially in thin plate or narrow gap brazing/welding scenarios, 4047 is the preferred choice.

If a more general-purpose, easy-to-operate, and slightly lower-cost welding wire is needed, 4043 can be considered.

4047 vs. 4145 Aluminum

If needed for thin-walled brazing (such as electronic radiator fins) and high fluidity applications, 4047 is the preferred choice.

If higher weld strength is required (such as aluminum-copper or high-load repairs), 4145 can be selected.