4047 Aluminum Disc for Brazing & Composite Structures

4047 aluminum disc for brazing is a precision-cut preform made from 4047 alloy (Al–Si 11–13%), commonly used as a brazing preform or interlayer.

It is used in thin-gauge and narrow-gap brazing or composite joining where filler flow and solidification control are critical. In applications such as clad cookware bases, heat exchanger assemblies, and other sealing-critical structures, 4047 helps reduce uneven filler spread, localized voids, post-braze cracking, and distortion in thin sections. Its low melting temperature and narrow freezing range support more consistent joint formation and lower rework risk.

• Better flow in thin sections: helps fill tight gaps more evenly and reduces unwetted or unfilled areas
• Narrow freezing range and low shrinkage: helps improve solidification control and reduce the risk of hot cracking or delamination
• Custom preforms available: discs, rings, and custom shapes can be supplied to specified diameters, thicknesses, or drawings

View detailed 4047 performance specifications

4047 Aluminum Disc Specifications

Alloy designation: EN AW-4047A (Al–Si brazing alloy / near-eutectic AlSi12)

Thickness: 0.03 – 2.00 mm

Diameter: 20 – 1000 mm

Shapes: circles (discs), rings, segments, washers, and custom-shaped brazing preforms

Thickness tolerance: ±0.005 mm

Surface finish: mill finish or degreased and brazing-ready

Standards: EN 573-3, AMS 4185, ASTM B209, ASTM B479, AWS A5.8

If you need 4047 in base product forms such as sheet, coil, foil, or wire rather than stamped discs, please visit our 4047 aluminum page for full specifications and standards.

Why Choose 4047 Brazing Aluminum Disc?

4047 is a typical Al–Si brazing alloy (Si ~11–13%) with a near-eutectic composition, giving it a low melting temperature and excellent fluidity in the brazing temperature range. It is commonly used as a filler metal or interlayer material in thin-gauge and narrow-gap joints to achieve stable spreading and consistent filling.

• In its molten state, 4047 spreads and wets interfaces more readily, improving filler uniformity and minimizing localized voids or unwetted areas.
• Its relatively narrow freezing range helps improve cooling control, which is useful in brazed joints that require consistent interface quality from batch to batch.
• Post-braze interfaces are typically smooth, with good joint uniformity—ideal for applications demanding visual continuity or high interface quality.
• 4047 can be supplied as sheet, foil, or other base forms, then converted into discs, rings, or custom preforms for use as brazing inserts or interlayer material.

As a high-silicon aluminum alloy, 4047 is mainly used for filling, sealing, and brazing applications. It is not intended for structural forming or primary load-bearing use.

4047 Aluminum Disc Technical Specifications

Chemical Composition of 4047 Aluminum Disc

4047 (EN AW-4047A, AlSi12) is defined by its high silicon content, which provides low melting temperature and good fluidity. All other alloying elements are tightly restricted to ensure stability, controllability, and consistency when used as a brazing filler or interfacial material.

Mechanical Properties of 4047 Aluminum Disc

This high-silicon 4047 aluminum alloy has low elongation (0.5% at a 50 mm gauge length) and is primarily used as a brazing filler or interlayer material. It is not suitable for applications that require significant plastic forming.

Because of its high silicon content and low melting point, 4047 is better suited for brazing filler and interlayer applications than for load-bearing structural use.

Applications of 4047 Brazing Aluminum Disc

Interlayer in Clad Cookware Bases

4047 brazing aluminum circles can serve as a brazing interlayer in clad cookware bases, providing preformed filler material with consistent shape and volume. Standard forms include solid circles, but ring-shaped (with inner hole) or custom-shaped preforms can also be used based on structural requirements.

Brazed Components for Heat Exchangers and Thermal Management

In thin-wall or narrow-gap brazing joints, 4047 preformed circles or rings can be placed precisely at designated locations. Their shape can be customized to match local joint geometry and assembly alignment needs.

Composite Joints Requiring Localized Sealing

For joints demanding high interfacial continuity and sealing integrity, 4047 can be used as localized preformed filler pieces. The form—solid circle, ring, or custom-shaped preform—can be selected based on assembly and positioning requirements.

Why Choose Chalco?

For 4047 brazing discs, thin-gauge consistency is one of the most critical quality factors. Chalco focuses on maintaining uniform thickness, flatness, diameter tolerance, and edge burr control for thin products. Surface cleanliness and delivery condition are also tailored to brazing application requirements, ensuring repeatable performance across batches during assembly and heating.

Integrated supply: Chalco offers both 4047 base materials and preformed components—including 4047 sheet, coil, and foil, as well as stamped parts (circles, rings, or custom preforms)—reducing batch variation from multiple suppliers. Custom parts can be produced based on DXF, PDF, or CAD drawings, or confirmed against physical samples to match your assembly structure and positioning method.

Delivery and documentation are prepared to support project execution. Packaging options include interleaving paper or protective film, moisture protection, oxidation control, and batch labeling for traceability. COA/material certificates, dimensional inspection records, and compliance documents such as RoHS or REACH can be provided upon request.

Inspection and Packaging of 4047 Aluminum Disc

To ensure quality stability during transport, storage, and subsequent brazing operations, every batch of 4047 brazing aluminum circles undergoes standardized inspection and professional export-grade packaging.

Inspection

Standardized quality control: chemical composition and critical dimensions are sampled and verified per quality management procedures to comply with the 4047 high-silicon aluminum alloy standard.

Surface inspection: visual and optical checks ensure absence of scratches, inclusions, or oxidation spots.

Mechanical property verification: hardness and elongation are randomly tested to guarantee stable brazing performance.

Batch traceability: complete inspection records are generated, supporting material certificates and batch traceability documentation.

Packaging Methods

Protective measures: circles are layered with separator boards or anti-scratch film.

Palletized/carton packaging: bulk quantities are packed in cartons, wooden crates, or on pallets, with weight kept within safe handling limits.

Moisture and oxidation protection: internal desiccants are included, with optional vacuum or nitrogen packaging suitable for ocean freight and container shipping.

Clear labeling: alloy designation, batch number, dimensions, and production details are marked for easy warehouse management and quality tracking.

What Other 4047 Products Can We Supply?

Beyond 4047 brazing circles (preforms/interlayers), Chalco also supplies other common 4047 product forms, enabling customers to select a complete process chain—from base material to stamping/forming to brazing/welding—based on their manufacturing workflow.

Frequently Asked Questions (FAQ)

Q1: Is there a difference between 4047 Aluminum Disc and 4047 Aluminum Circle?

They are essentially the same product, with terminology varying by application context. "Disc" is commonly used in brazing or industrial component applications, while "Circle" typically refers to sheet-based fabrication contexts. The material composition and specifications are identical.

Q2: Why choose 4047 over 4043?

4047 has a higher silicon content, resulting in a lower melting point and better fluidity, making it suitable for thin-gauge, narrow-gap, or high-seal-integrity brazed assemblies.

4047 is often preferred when better wetting and gap-filling performance are required.

Q3: Is 4047 suitable for load-bearing structures?

4047 is primarily used as a brazing filler or interfacial material. Load-bearing functions are typically handled by the base structure, and 4047 is not recommended as a primary structural material.

Q4: Is flux or shielding gas always required?

The need for flux or shielding gas depends on the specific brazing process and surface condition. Vacuum brazing typically does not require flux, whereas furnace brazing or operations in air may need auxiliary protection.

Q5: How should it be stored to prevent oxidation from affecting wetting performance?

Store in a dry environment and avoid prolonged exposure to high humidity after opening. For long-term storage, retain original packaging and use moisture-resistant measures.

Request a Quote or Project Support

If you are evaluating 4047 brazing discs for heat exchangers or thermal management components, Chalco Aluminum can support custom samples, pilot batches, and stable volume supply.

To expedite your quote, please provide:

• Diameter and thickness specifications
• Temper or hardness requirements
• Order quantity (per batch or annual volume)
• Brazing process or application details
• Special packaging or export documentation needs

We will review the technical requirements and respond with a quotation within 24 hours.

Send your RFQ or drawings to start technical review and quoting.