4147 aluminum alloy (AlSi12 / EN AW-4147) is a high-silicon, non-heat-treatable 4000 series aluminum alloy engineered primarily as a brazing filler metal and cladding material. With 11–13% silicon content, it offers a narrow melting range, excellent fluidity, and reliable joint formation for vacuum brazing and furnace brazing applications. Linsy supplies 4147 aluminum wire, filler rod, sheet, and coil in tempers O, H14, and H24, with custom sizes and MTC reports available.
Beschikbare formulieren: wire / filler rod / sheet / coil
Veelvoorkomende temperamenten: O / H14 / H24
Ondersteuning bij de verwerking: CNC machining / laser cutting / surface finishing
Kwaliteitsdocumenten: MTC-rapport bij elke bestelling, SGS-keuring op verzoek
4147 aluminum alloy (UNS A94147) is a high-silicon, non-heat-treatable aluminum alloy from the 4000 series, containing approximately 11–13% silicon (AlSi12). Unlike structural alloys such as 6061 or 7075, 4147 is engineered primarily as a brazing and welding filler material. Its high silicon content lowers the melting point to a narrow range near the aluminum-silicon eutectic (approximately 577–582°C), producing excellent fluidity, clean flow, and leak-proof joints during brazing.
4147 is closely related to 4047 (both are AlSi12-type alloys) and serves the same core function: providing a reliable filler metal for joining aluminum components in vacuum brazing, furnace brazing, and fusion welding. The alloy is typically supplied in O (Annealed) or H-series tempers and is used extensively in heat exchanger manufacturing, automotive cooling systems, and HVAC applications.
Linsy supplies 4147 aluminum in the product forms most relevant to brazing and filler applications. Dimensions and tolerances can be tailored to your project requirements.
| Formulier | Temper | Diameter (mm) | Lengte |
|---|---|---|---|
| 4147 Wire (Spool) | O, H14 | 1.2 – 5.0 | Coil / Spool |
| 4147 Filler Rod (Straight) | O, H14 | 1.6 – 5.0 | 500 – 1000 mm |
| Formulier | Temper | Dikte (mm) | Breedte (mm) | Lengte (mm) |
|---|---|---|---|---|
| 4147 Sheet / Coil | O, H14, H24 | 0.3 – 6.0 | 500 – 2600 | 500 – 16000 |
4147 sheet and coil are commonly used as cladding material — a thin layer of 4147 is roll-bonded onto a core alloy (such as 3003 or 6951) to create brazing sheet. When heated, the 4147 cladding melts and flows to form the brazed joint, while the core alloy retains its structural integrity.
| Standaardsysteem | Benaming |
|---|---|
| UNS | A94147 |
| EN AW | EN AW-4147 / AlSi12 |
| ISO | Al Si12 |
| AA / SAE | 4147 |
| DIN (Duitsland) | 3.2581 / AlSi12 |
Algemeen geldende normen:
Typical composition limits (per Aluminum Association / EN standards, weight %):
| Element | Min % | Max % |
|---|---|---|
| Silicium (Si) | 11.0 | 13.0 |
| IJzer (Fe) | - | 0.8 |
| Koper (Cu) | - | 0.3 |
| Mangaan (Mn) | - | 0.15 |
| Magnesium (Mg) | - | 0.10 |
| Zink (Zn) | - | 0.20 |
| Anderen, elk | - | 0.05 |
| Overige, totaal | - | 0.15 |
| Aluminium (Al) | Saldo | |
4147 is a filler alloy, not a structural alloy. The values below represent typical properties for 4147 in the annealed (O) condition. Because 4147 is not heat-treatable, mechanical properties do not vary significantly across tempers — the primary selection criterion is formability and brazing performance, not tensile strength.
| Eigendom | Typische waarde |
|---|---|
| Treksterkte (Ultieme) | 130 – 160 MPa |
| Vloeigrens (0,2%) | 55 – 90 MPa |
| Rek bij breuk | 5 – 15 % |
| Elasticiteitsmodulus | ≈ 69 GPa |
| Dichtheid | ≈ 2.66 g/cm³ |
| Melting Range (Solidus – Liquidus) | ≈ 577 – 582 °C |
With 11–13% silicon, 4147 is very close to the aluminum-silicon eutectic composition (12.6% Si, 577°C). This gives it an extremely narrow melting range of approximately 577–582°C, which means the alloy transitions rapidly from solid to liquid. In brazing, a narrow melting range produces clean, controlled flow and minimizes the risk of core alloy erosion or distortion.
The high silicon content gives 4147 excellent fluidity when molten. This allows the filler to penetrate tight joint gaps, wick along seams by capillary action, and form uniform, leak-proof bonds — critical for heat exchanger tubes and radiator fins where joint integrity directly affects pressure retention.
In brazing sheet applications, 4147 is roll-bonded as a thin cladding layer (typically 5–15% of total sheet thickness) onto a structural core alloy such as 3003, 3005, or 6951. During furnace or vacuum brazing, the 4147 cladding melts and flows to form joints between layers, while the higher-melting core alloy maintains its shape and structural properties.
4147 can be used as a GTAW (TIG) or GMAW (MIG) filler wire for welding aluminum components. It offers good crack resistance compared to lower-silicon fillers, particularly when welding 4xxx or 6xxx base alloys. However, it is not recommended for welding 5xxx-series (magnesium-bearing) alloys, as the combination of high silicon and magnesium can form brittle Mg₂Si precipitates at the weld interface.
4147 is primarily used as a brazing filler metal and cladding alloy. Its applications are concentrated in industries that rely on aluminum-to-aluminum joining for thermal management systems:
De kwaliteitscontrole bij Linsy omvat het hele proces, van de selectie van grondstoffen tot de inspectie van het eindproduct. Elke bestelling wordt geleverd met een MTC (Material Test Certificate) dat na de productie door Linsy Aluminum wordt afgegeven en waarin de resultaten van de chemische samenstelling en de mechanische eigenschappen van de betreffende partij zijn opgenomen.
Voor klanten die verificatie door een derde partij nodig hebben, zijn SGS-testrapporten op verzoek verkrijgbaar tegen extra testkosten. Beschikbare SGS-rapporten zijn onder meer:
Linsy Aluminum is a Shenzhen-based aluminum factory with more than 20 years of industry experience, supplying 4147 and other 1000–8000 series alloys to customers across automotive, HVAC, manufacturing, and industrial applications.
For your 4147 sourcing, this means:
Use these guides to learn more about aluminum brazing filler alloys:
4147 aluminum is primarily used as a brazing filler metal and cladding alloy for heat exchangers, radiators, and HVAC components. It is also used as TIG/MIG filler wire for welding 4xxx and 6xxx series aluminum where crack resistance is important.
4147 and 4047 are both AlSi12-type alloys with nearly identical chemical composition (11–13% silicon). 4047 is the more commonly referenced designation in welding and brazing standards (e.g., AWS ER4047 / BAlSi-4), while 4147 is the wrought product designation. In practice, the two alloys are often used interchangeably for brazing and filler applications.
No. 4147 is a filler and brazing alloy, not a structural alloy. Its tensile strength (130–160 MPa) is significantly lower than structural grades like 6061-T6 (290+ MPa). 4147 should not be used for load-bearing applications — its value lies in its brazing and joining performance.
No, 4147 is a non-heat-treatable alloy. It is supplied in O (Annealed) or strain-hardened tempers (H14, H24). Strength cannot be increased by solution heat treatment and aging.
Common tempers are O (Annealed) for maximum ductility and formability, H14 (Half-hard) for moderate strength, and H24 (Half-hard, annealed after strain hardening) for a balance of strength and formability.
4147 has a narrow melting range of approximately 577–582°C, which is near the aluminum-silicon eutectic temperature. This narrow range is what makes it an excellent brazing filler — it melts and flows quickly without excessive heat exposure to the core alloy.
It is not recommended. Welding 5xxx (magnesium-bearing) alloys with 4147 filler can produce brittle Mg₂Si precipitates at the weld interface. For 5xxx series base metals, 5356 or 5183 filler wire is typically preferred.
Common standards include ASTM B209 (sheet and plate), ISO 6361 (wrought aluminum sheet/strip/plate), EN 573-3 (chemical composition), and AWS A5.10/A5.10M (welding consumables, related designation ER4047).
For non-stock sizes or custom specifications, typical lead time is 10–60 days depending on alloy, dimensions, processing requirements, and order complexity. In-stock standard specifications can ship faster — contact our team for a specific quote.
Linsy supports low-MOQ custom production for non-stock 4147 items. MOQ varies by form, size, and processing scope; please share your requirements and we will confirm feasibility.
Every order ships with an MTC (Material Test Certificate) issued by Linsy Aluminum after production. Optional SGS third-party test reports are available on request at an additional testing cost.
Yes, samples can be arranged for most standard and custom specifications. Sample cost and lead time depend on size and processing requirements.
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