4047 aluminum alloy (AlSi12) is a 4000-series aluminum-silicon alloy containing approximately 11–13% silicon, widely used as a brazing filler metal and welding consumable. Its near-eutectic composition gives it a low melting point (~577–582 °C), outstanding fluidity, and minimal solidification shrinkage — making it the most common choice for aluminum brazing in automotive heat exchangers, HVAC components, and general joining applications. Linsy supplies 4047 aluminum as brazing sheet/strip, filler wire, and foil in O and F tempers, with custom dimensions, surface finishing, and MTC reports available.
Beschikbare formulieren: brazing sheet / strip / filler wire / foil
Veelvoorkomende temperamenten: O / F
Ondersteuning bij de verwerking: CNC machining / laser cutting / surface finishing
Kwaliteitsdocumenten: MTC-rapport bij elke bestelling, SGS-keuring op verzoek
4047 aluminum alloy (UNS A94047, EN AW-4047, also known as AlSi12) is a non-heat-treatable wrought alloy in the 4000 series, characterized by its high silicon content of approximately 11–13%. This near-eutectic Al-Si composition gives 4047 a melting range of roughly 577–582 °C — lower than that of most other aluminum alloys — along with excellent fluidity, low viscosity in the molten state, and minimal solidification shrinkage. These properties make 4047 the dominant filler alloy for aluminum brazing and a frequently specified welding wire for joining aluminum components.
Unlike structural aluminum grades such as 6061 or 7075, 4047 is primarily used as a consumable material rather than for load-bearing applications. It is typically supplied in thin gauges — as brazing sheet (often clad onto a core alloy), strip, foil, or filler wire — and is approved under standards including AWS A5.10, EN ISO 18273, and ASTM B211.
Linsy supplies 4047 aluminum in the product forms most commonly used for brazing and welding applications. All dimensions can be tailored to your production requirements.
| Formulier | Temper | Dikte (mm) | Breedte (mm) |
|---|---|---|---|
| 4047 Brazing Sheet / Strip | O, F | 0.05 – 3.0 | 10 – 1200 |
| 4047 Clad Brazing Sheet | O, F | 0.1 – 2.0 | 10 – 1200 |
| Formulier | Temper | Diameter (mm) | Verpakking |
|---|---|---|---|
| 4047 Filler Wire (TIG) | O | 1.0 – 5.0 | Spool / Cut length |
| 4047 Filler Wire (MIG) | O | 0.8 – 1.6 | Spool |
| 4047 Brazing Rod | O | 1.6 – 4.0 | Cut length |
| Formulier | Temper | Dikte (mm) | Breedte (mm) |
|---|---|---|---|
| 4047 Brazing Foil | O, F | 0.02 – 0.2 | 5 – 600 |
Custom dimensions, coil weights, and packaging specifications are available on request. For applications requiring 4047 in bar, tube, or plate form, please contact us for availability and lead time.
| Standard / System | Benaming |
|---|---|
| UNS | A94047 |
| EN (European) | EN AW-4047 / EN AW-AlSi12 |
| ISO | AlSi12 |
| AWS (Welding) | ER4047 / R4047 (AWS A5.10) |
| Common Name | AlSi12, 12% Silicon Aluminum |
| Element | Inhoud (%) |
|---|---|
| Silicium (Si) | 11.0 – 13.0 |
| IJzer (Fe) | ≤ 0.8 |
| Koper (Cu) | ≤ 0.30 |
| Mangaan (Mn) | ≤ 0.15 |
| Magnesium (Mg) | ≤ 0.10 |
| Zink (Zn) | ≤ 0.20 |
| Others (Each) | ≤ 0,05 |
| Others (Total) | ≤ 0.15 |
| Aluminium (Al) | Saldo |
4047 is a non-heat-treatable alloy; its strength is controlled primarily through work hardening and annealing. The values below are for O-temper (annealed) material — the most common condition for brazing and welding consumables.
| Temper | Treksterkte (MPa) | Opbrengststerkte (MPa) | Rek (%) | Typisch gebruik |
|---|---|---|---|---|
| O | 120 – 150 | 50 – 70 | 15 – 20 | Brazing filler, welding wire |
| F (As-Fabricated) | 130 – 180* | 60 – 120* | 10 – 18* | Strip / sheet in as-rolled condition |
* Varies with the degree of cold work applied during fabrication. Contact Linsy for temper-specific test data.
| Temper | Beschrijving | Key Benefit | Beste voor |
|---|---|---|---|
| O | Annealed (fully soft) | Maximum ductility and formability; easy to feed as wire | Filler wire, brazing rod, foil for stamping |
| F | As-fabricated (no special thermal control) | As-supplied condition with moderate strength; most economical | Strip and sheet for non-critical brazing |
4047 is not heat-treatable; high-strength tempers (T6, T651, etc.) are not applicable. The alloy achieves its optimal performance through its low-melting, high-fluidity characteristics rather than mechanical strength.
The near-eutectic Al-Si composition gives 4047 a melting range approximately 50–80 °C lower than common base alloys like 3003 or 6061. This allows it to flow and fill braze joints before the base metal reaches its solidus temperature — critical for controlled-atmosphere brazing (CAB) and vacuum brazing processes.
4047 exhibits minimal volumetric shrinkage during solidification, which reduces the risk of hot cracking and porosity in braze joints. This is a key advantage over filler alloys with wider freezing ranges.
4047 offers adequate general corrosion resistance, though it is not specifically formulated for marine or chemical environments. When coupled with a corrosion-resistant core alloy (e.g., 3003 or 6063 clad brazing sheet), the overall assembly meets typical automotive and HVAC corrosion requirements.
4047 provides moderate electrical conductivity (~35–40% IACS) and good thermal conductivity, which are beneficial in brazed heat exchanger and electrical conductor applications where the filler must not create a thermal or electrical barrier at the joint.
| Industrie | Typische toepassingen | Why 4047 Is Used |
|---|---|---|
| Automotive | Radiators, condensers, evaporators, charge air coolers, oil coolers | Low melting point and good flow enable high-volume CAB brazing of heat exchanger cores |
| HVAC & Refrigeration | Heat exchanger coils, microchannel tubes, manifold assemblies | Compatible with standard aluminum brazing processes; forms leak-tight joints |
| General Joining | Repair and maintenance brazing of aluminum parts; aluminum-to-aluminum and aluminum-to-copper joints (with proper flux) | Easy to apply as wire or rod; lower working temperature protects base metal from overheating |
| Power Electronics | Bus bar connections, heat sinks, liquid cooling plates | Good thermal conductivity ensures minimal thermal resistance at brazed interfaces |
| Welding Consumables | TIG and MIG filler wire for joining 6000-series and 3000-series alloys | High silicon content improves weld pool fluidity and reduces hot cracking sensitivity |
4047’s processing behavior differs significantly from structural aluminum grades:
Every 4047 order from Linsy includes a Material Test Certificate (MTC) documenting the chemical composition and mechanical properties of the supplied batch. SGS third-party testing — including chemical analysis, mechanical property verification, RoHS/REACH compliance, and dimensional inspection — is available on request.
Linsy operates under ISO 9001, ISO 14001, and ISO 45001 management systems. Incoming raw materials and outgoing finished products are inspected to ensure conformance to the specified alloy composition, temper condition, and dimensional tolerances.
Linsy Aluminum is a Shenzhen-based aluminum factory with more than 20 years of industry experience, serving buyers across automotive, HVAC, power electronics, and general industrial markets in Europe, Southeast Asia, the Middle East, and South America.
We supply 4047 brazing sheet, strip, filler wire, and foil in standard and custom dimensions. Our broad stock coverage enables fast turnaround on common specifications, and our low-MOQ custom production accommodates non-stock items with a typical lead time of 10–60 days, depending on alloy, dimensions, and processing requirements.
With in-house processing capabilities and comprehensive quality documentation, Linsy supports buyers who need both material supply and downstream processing — from brazing foil slit to exact width, to filler wire cut to specified length and spooled for automated feeding.
What is 4047 aluminum used for?
4047 aluminum is primarily used as a brazing filler metal and TIG/MIG welding wire. Its low melting point and high fluidity make it the standard choice for brazing aluminum automotive heat exchangers, HVAC components, and general aluminum joining.
What is the difference between 4043 and 4047 aluminum filler?
4043 contains approximately 4.5–6.0% silicon, while 4047 contains 11–13% silicon. The higher silicon content in 4047 gives it a lower melting range and better fluidity, making it preferred for brazing. 4043 is more commonly used for general-purpose welding where higher joint strength is needed.
Can 4047 aluminum be heat-treated?
No. 4047 is a non-heat-treatable alloy. Its properties are controlled through the silicon content and cold working. If higher strength is required at the joint, consider the base metal selection rather than the filler alloy.
What is the melting point of 4047 aluminum?
4047 has a melting range of approximately 577–582 °C, which is 50–80 °C lower than common base alloys such as 3003 (643–654 °C) or 6061 (582–652 °C). This temperature gap is what makes it effective as a brazing filler — the 4047 melts and flows before the base metal reaches its solidus.
Do you supply 4047 as brazing sheet clad onto a core alloy?
Yes. Linsy supplies 4047 clad brazing sheet where a thin layer of 4047 is metallurgically bonded to one or both sides of a core alloy (typically 3003 or 6063). Please specify your core alloy, clad ratio, and dimensions when requesting a quotation.
Can 4047 filler wire be used for all aluminum alloys?
4047 filler is compatible with most common aluminum base alloys, especially 3000-series, 6000-series, and many casting alloys. It is not recommended for welding 5000-series alloys with high magnesium content (above ~2.5% Mg), as excessive Mg₂Si formation can embrittle the weld. It is also not recommended for joints that will be anodized, as the high silicon content discolors the anodic coating.
What documentation do you provide with 4047 orders?
Every order includes a Material Test Certificate (MTC) from Linsy showing the chemical composition and mechanical properties of the supplied batch. SGS test reports (chemical analysis, mechanical testing, RoHS/REACH compliance) are available on request with additional testing cost.
What is the typical lead time for 4047 products?
Standard-gauge 4047 brazing sheet and common-diameter filler wire from our stock can ship within 10–15 days. Custom dimensions, clad brazing sheet, and non-stock specifications typically require 15–60 days, depending on the specifics of the order.
What is your minimum order quantity (MOQ)?
Linsy supports low MOQ ordering. For in-stock standard specifications, small quantities are accepted. For custom production, MOQ varies by alloy, product form, and processing requirements. Contact us with your specifications for a specific MOQ quotation.
Do you provide samples?
Yes. Sample pieces of 4047 brazing sheet, strip, or filler wire are available for evaluation. Please contact us with your required dimensions and alloy specification.
What payment methods do you accept?
We accept T/T (bank transfer) and L/C (Letter of Credit). Payment terms are usually 30% deposit with order and 70% balance before shipment, but terms can be discussed for long-term partnerships.
What shipping methods are available?
We ship by sea freight (FCL/LCL), air freight, and courier services (DHL, FedEx, UPS, TNT) depending on order volume, urgency, and destination. Packaging is reinforced for international transit to prevent damage.
Do you offer replacement or quality guarantee?
All products are inspected before shipment and shipped with an MTC. If material is found to be non-conforming to the agreed specification upon receipt, we arrange replacement or refund subject to verification.
Linsy Voordelen
Linsy Aluminum is een toonaangevende leverancier van aluminiumverwerkingsproducten en levert aan diverse industrieën, waaronder de ruimtevaart, algemene machinebouw, automobielindustrie, scheepvaart, scheepsbouw en andere gespecialiseerde industriële toepassingen.
We zetten ons in om de hoogste kwaliteits- en milieunormen te handhaven, zoals blijkt uit onze certificeringen: ISO 9001:2008, ISO 14001:2004 en SGS.
