4643 Aluminum alloy,Aluminum 4643 alloy,E FORU

### **Product Introduction: Aluminum 4643 Alloy** **Overview** Aluminum 4643 Alloy is a specialized aluminum-silicon-magnesium welding filler metal designed primarily for welding 6xxx series aluminum alloys. The addition of magnesium provides improved strength through precipitation hardening after welding, making this alloy particularly suitable for applications where post-weld heat treatment is employed to restore base metal properties in the heat-affected zone (HAZ). --- ### **1. Chemical Composition (Typical Weight %)** | Element | Content (%) | |---------|-------------| | **Aluminum (Al)** | Balance | | **Silicon (Si)** | 3.6 - 4.6 | | **Magnesium (Mg)** | 0.10 - 0.30 | | **Iron (Fe)** | ≤ 0.8 | | **Copper (Cu)** | ≤ 0.10 | | **Manganese (Mn)** | ≤ 0.15 | | **Zinc (Zn)** | ≤ 0.20 | | **Titanium (Ti)** | ≤ 0.15 | | **Other Elements** | ≤ 0.05 each | | **Total Others** | ≤ 0.15 | --- ### **2. Physical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | 2.69 g/cm³ | | **Melting Range** | 575 - 630 °C | | **Solidus Temperature** | 575 °C | | **Liquidus Temperature** | 630 °C | | **Electrical Conductivity** | 43-48% IACS | | **Thermal Conductivity** | 168-188 W/m·K | | **Coefficient of Thermal Expansion** | 22.6 × 10⁻⁶/°C | | **Modulus of Elasticity** | 71 GPa | --- ### **3. Mechanical Properties (As-Welded & Heat-Treated Conditions)** | Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | |-----------|------------------------|----------------------|----------------| | **As-Welded** | 145-185 | 75-115 | 10-18 | | **After PWHT** | 200-240 | 160-200 | 8-14 | --- ### **4. International Standards** | Standard Body | Designation | |---------------|-------------| | **Aluminum Association (AA)** | AA 4643 | | **European Standard (EN)** | EN AW-4643 | | **ISO** | AlSi4Mg (ISO 18273) | | **UNS** | A94643 | | **AWS** | A5.10 ER4643 | --- ### **5. Product Applications** **Welding Applications:** - TIG and MIG welding of 6xxx series alloys - Structural aluminum welding - Automotive frame welding - Bicycle and motorcycle frames - Architectural aluminum welding **Post-Weld Heat Treatment Applications:** - Heat-treatable structural components - Automotive suspension components - Aerospace structures - High-strength architectural members - Military vehicle frames **Base Metal Compatibility:** - 6061, 6063, 6082 alloys - 6005, 6005A alloys - 6101, 6105 alloys - Other heat-treatable aluminum alloys --- ### **6. Key Characteristics & Advantages** - **Post-Weld Heat Treatable**: Magnesium content enables precipitation hardening after welding - **Good Color Match**: Excellent anodizing color match with 6xxx series base metals - **Reduced Hot Cracking**: Balanced silicon content minimizes solidification cracking - **Improved Strength**: Higher strength after post-weld heat treatment compared to 4043 - **Good Fluidity**: Adequate flow characteristics during welding - **Corrosion Resistance**: Comparable to 6xxx series base metals - **Versatile Application**: Suitable for both TIG and MIG processes --- ### **7. Special Features** **Welding Performance:** - Stable arc characteristics - Minimal spatter generation - Good bead appearance - Easy slag removal - Consistent deposition rates **Heat Treatment Response:** - Solution treatment range: 530-550°C - Artificial aging range: 160-180°C - Can restore base metal properties in HAZ - Improves overall joint strength --- ### **8. Processing Guidelines** **Welding Parameters:** - Suitable for both TIG and MIG processes - Recommended shielding gas: Argon or Argon/Helium mixtures - Standard welding techniques applicable - Preheating recommended for thick sections (>6mm) **Post-Weld Heat Treatment:** - Solution treatment: 530-550°C followed by quenching - Artificial aging: 160-180°C for 8-18 hours - Proper fixturing to prevent distortion - Controlled heating and cooling rates **Quality Control:** - Visual inspection for surface defects - Dye penetrant testing for critical applications - Mechanical testing for quality verification - Microstructural examination when required **Disclaimer:** The information provided is for reference purposes only. Welding performance and heat treatment results may vary depending on specific base metals, joint configurations, and process parameters. For critical applications, conduct appropriate welding procedure qualifications and consult technical data from material suppliers. The alloy is specifically optimized for welding heat-treatable aluminum alloys where post-weld heat treatment will be employed to restore mechanical properties.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1767 gallon liquid totes Special package is available on request.