4043 brazing aluminum foil coil strip
4043 brazing aluminum foil coil strip is a commonly used aluminum welding material, primarily made from aluminum-silicon alloy.
The 4043 alloy is mainly composed of aluminum and silicon, with silicon content typically ranging from 4.5% to 6.0%. The composition design of this alloy provides good fluidity and filling capacity during welding.
The 4043 alloy exhibits good corrosion resistance, making it suitable for welding aluminum alloy components in marine environments and ships. This material plays an important role in manufacturing high-strength, lightweight aluminum alloy structures.
Aluminum 4043 is a commonly used filler alloy with good flowability, making it ideal for aluminum welding. It contains about 5% silicon, which improves the molten pool flowability and enhances the wettability of the weld metal, making 4043 a preferred choice for welders. This alloy has low sensitivity to weld cracking and typically produces bright, almost flawless welds.
4043 aluminum-silicon filler metal is particularly suitable for welding heat-treatable aluminum alloys and for repairing cast aluminum alloys. Compared to other aluminum alloys, it is less sensitive to welding cracks, especially when welding 6XXX series aluminum alloys. This alloy can be widely used in GMAW (MIG) and GTAW (TIG) welding processes.
4043 is suitable for welding alloys such as 3003, 3004, 5052, 6061, 6063, and is particularly effective for welding, repairing, and fine craftsmanship of aluminum alloys.
| Features | Description |
| Specialized Design | Designed for welding heat-treatable aluminum alloys, especially suitable for 6XXX series alloys. |
| Low Melting Point | Contains silicon, with a lower melting point and better flowability compared to 5XXX series filler alloys. |
| Weld Bead Profile | Produces smooth, aesthetically pleasing weld bead profiles during welding. |
| Crack Sensitivity | Low sensitivity to cracking when welding 6XXX series aluminum alloys, suitable for high-quality welds. |
| All-Position Welding | Suitable for all-position welding, allowing for ease of operation at different welding angles. |
| Repairing Aluminum/Silicon Cast Alloys | Commonly used for repairing aluminum/silicon cast alloys, such as 353/A356 series. |
| Welding 6061 Aluminum Alloy | A common choice for welding 6061 aluminum alloy. |
| Post-Weld Surface | The post-weld surface is gray, with good anodizing results. |
Features of 4043 brazing aluminum foil coil strip
Low melting point
Compared to aluminum-magnesium alloys, the 4043 alloy has a relatively low melting point, typically between 570°C and 610°C. This characteristic allows the 4043 brazing aluminum foil to be welded at lower temperatures, reducing thermal impact on the base material and minimizing the risk of distortion and welding cracks.
Good fluidity
The 4043 brazing aluminum foil exhibits excellent fluidity, meaning that when heated, the material can flow better and fill welding joints, resulting in uniform welds and improved welding quality.
Corrosion resistance
This alloy demonstrates good corrosion resistance in most environments, particularly in marine and humid conditions. This makes the 4043 brazing aluminum foil ideal for welding marine aluminum alloy components, effectively preventing corrosion at the welded joints.
Low tendency for welding cracks
The tendency for welding cracks in 4043 brazing aluminum foil is significantly lower than that of aluminum-magnesium alloys, making it more reliable during the welding process and reducing the need for later maintenance.
4043 brazing aluminum foil coil strip Chemical Composition
| 4043 Chemical Composition(%) | |||||||||
| Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Ni | Alu |
| 4.5-6.0 | <0.8 | <0.30 | <0.05 | <0.05 | - | <0.10 | <0.20 | - | Remainder |
Mechanical properties of 4043 brazing aluminum foil coil strip
| Alloy | Temper |
Thickness (mm) |
Mechanical properties | ||
| Tensile Strength(Mpa) |
Yield strength (Mpa) |
Elongation (%) |
|||
| standard value | standard value | A50 | |||
| Not less than | |||||
| 4043 | O | 0.05-0.5 | 90-140 | 35 | 5 |
| ＞0.5-3.0 | 10 | ||||
|
H12 H22 |
0.05-0.5 | 120-170 | 100 | 2 | |
| ＞0.5-3.0 | 3 | ||||
|
H14 H24 |
0.05-0.5 | 140-190 | 120 | 1 | |
| ＞0.5-3.0 | 1 | ||||
|
H16 H26 |
0.05-0.5 | 160-210 | 140 | 0.5 | |
| ＞0.5-3.0 | 1 | ||||
| H18 | 0.05-0.5 | 180 | 160 | 0.2 | |
| ＞0.5-3.0 | 1 | ||||
Applications of 4043 Brazing Aluminum Foil Coil Strip
The 4043 brazing aluminum foil coil strip is widely used in shipbuilding, aerospace, automotive manufacturing, and other fields requiring aluminum alloy welding. Especially when welding 6XXX series aluminum alloy components, the 4043 alloy provides excellent welding performance and structural strength.
- Shipbuilding: The 4043 alloy is commonly used for welding 6XXX series aluminum alloy components, which exhibit good mechanical properties and corrosion resistance, making them ideal for ship structures.
- Automotive industry: The 4043 alloy is also employed in certain aluminum alloy welds in the automotive industry, particularly for manufacturing components that require lightweight and durability.
- Aerospace: Used in the manufacturing and repair of various aerospace equipment.
Due to its high silicon content, the 4043 alloy performs exceptionally well in humid and corrosive environments, making it particularly suitable for long-term applications in marine environments.
4043 Aluminum Physical and Mechanical Properties
| Melting Range | 1065-1170°F (574-632°C) |
| Density at 68°F | 0.097 lbs./in³ |
| Conductivity | 42 %IACS (-O) |
| Resistance to Corrosion | B (Gen) A (SCC) |
| Anodize Color | Gray |
4043 Aluminum Standard Sizes and Diameters
| Diameters (inches) | Package Form |
| 0.030, 0.035, 3/64, 1/16, 3/32, 1/8 | 4 & 12 in. Spools |
| 1/16, 3/32, 1/8, 5/32, 3/16, 1/4 | Straight lengths |
Common Questions and Answers About Aluminum Brazing
How strong is aluminum brazing?
The strength of aluminum brazing is typically close to the strength of the welded joint, making it an ideal choice for many applications. Since the temperature used in brazing is significantly lower than that of welding, the metallurgical properties of the base material are generally not affected, reducing potential issues in the heat-affected zone and resulting in lower residual stresses in the finished product.
What is the best aluminum brazing rod?
When choosing an aluminum brazing rod, 4043 aluminum alloy brazing rod is one of the most commonly used options. It has a low melting point, is easy to process, and offers excellent corrosion resistance, making it suitable for brazing a variety of aluminum alloys. Additionally, 5356 aluminum alloy brazing rod is also a popular choice. Although it has a higher melting point, it provides stronger strength and better crack resistance, making it ideal for applications requiring higher strength.
