1. Core Chemical Composition (AWS A5.10 Standard) 2. Typical Mechanical Properties (As-Welded Condition) 3. Performance Comparison with ER4043 Welding Wire 4. Application Scenarios & Performance Matching 5. Standard Certification & Technical Specifications 6. Key Precautions 7. Reference...
1. Core Chemical Composition (AWS A5.10 Standard)
| Element |
Content Range (%) |
Function Analysis |
| Si |
11.0-13.0 |
Eutectic composition improves fluidity, suppresses hot cracking, and exhibits gray-black color after anodization. |
| Fe |
≤0.8 |
Controls impurity content to prevent the precipitation of brittle phases. |
| Cu |
≤0.3 |
Limits copper content to avoid intergranular corrosion (caution required when welding aluminum alloys with Cu content >2%). |
| Al |
Remainder |
Base metal that provides lightweight properties and corrosion resistance. |
2. Typical Mechanical Properties (As-Welded Condition)
| Performance Indicator |
Value Range (Typical Value) |
Test Conditions & Application Scenarios |
| Tensile Strength |
240-310 MPa (270 MPa) |
Suitable for general structural parts in as-welded condition; can reach 310 MPa when welding 6061-T6 base metal. |
| Yield Strength |
180-276 MPa (200 MPa) |
Low plasticity in as-welded condition; may decrease after heat treatment (e.g., drops to 234 MPa after welding 2014-T6 base metal). |
| Elongation |
8-12% (Typical: 10%) |
Superior to ER4043 (≈7%) in as-welded condition, but decreases significantly after heat treatment (e.g., drops to 3.3% after welding 6082 aluminum alloy). |
| Shear Strength |
200-250 MPa |
Outstanding fillet weld performance, 15-20% higher than ER4043, suitable for shear-resistant scenarios such as automotive radiators. |
| Hardness (HV) |
80-100 |
Microhardness of the weld zone; compatibility with the base metal must be verified by metallographic analysis. |
3. Performance Comparison with ER4043 Welding Wire
| Comparison Dimension |
ER4047 |
ER4043 |
| Silicon Content |
11-13% (Eutectic composition) |
4.5-6.0% (Hypoeutectic composition) |
| Melting Point |
577-582℃ (50℃ lower) |
621-638℃ |
| Hot Cracking Resistance |
Significantly superior to ER4043 (reduction of over 30%) |
Moderate, suitable for general welding |
| Weld Color |
Gray-black after anodization |
Silver-white after anodization |
| Typical Tensile Strength |
270 MPa (as-welded) |
220 MPa (as-welded) |
| Elongation |
10% (as-welded) |
12% (as-welded) |
| Application Scenarios |
Thin-walled parts, high-temperature environments, crack-susceptible aluminum alloys (e.g., 6061) |
General welding, preferred for applications with high appearance requirements |
4. Application Scenarios & Performance Matching
| Application Field |
Key Performance Requirements |
Actual Test Data or Advantages |
| Automotive Manufacturing |
Hot cracking resistance, shear strength |
Shear strength of engine block welds >200 MPa; hot cracking rate of radiator welds <5%. |
| Architectural Decoration |
Consistency of anodized color, corrosion resistance |
Gray-black color after anodization matches 6063 base metal; no obvious surface corrosion in salt spray test (1000 hours). |
| High-Temperature Environments |
Long-term high-temperature strength retention |
Tensile strength retention rate >85% at 150℃, superior to ER5356 (≈75%). |
| Thin-Walled Part Welding |
Low melting point, high fluidity |
Weld pool fluidity increased by 30%; welding speed up to 1.5 m/min (1.2 m/min for ER4043). |
5. Standard Certification & Technical Specifications
| Standard Category |
Core Requirements |
Certification Basis |
| Chemical Composition |
Si: 11-13%, Fe ≤0.8%, Cu ≤0.3% |
AWS A5.10, ISO 18273 |
| Wire Dimensions |
Diameter tolerance ±0.02 mm, packaging form (e.g., 150 kg drum) |
AMS 4185, ISO 544 (Class H9) |
| Weld Quality |
Radiographic inspection complies with ISO 18273; porosity ≤ Grade 2 |
ISO 18273, EN 13479 |
| Mechanical Properties |
Tensile strength ≥240 MPa (as-welded), elongation ≥8% |
AWS A5.10, GB/T 2651 |
6. Key Precautions
| Risk Type |
Impact Mechanism |
Countermeasures |
| Base Metal Dilution |
High-magnesium base metals (e.g., 5052) melting into the weld form Mg₂Si brittle phases, reducing strength by 10-15%. |
Control welding speed ≤1.2 m/min; preheat to 100-150℃ before welding. |
| Porosity Defects |
Unremoved oxide film causes hydrogen porosity, reducing weld strength by over 20%. |
Clean with a wire brush + acetone; control interpass temperature ≤100℃ during welding. |
| Insufficient Corrosion Resistance |
Corrosion resistance in salt spray environments is slightly lower than ER5356; anodization can triple corrosion life. |
Anodization (film thickness ≥15μm) or acrylic paint coating is recommended. |
| High-Temperature Embrittlement |
Long-term exposure to high temperatures (>200℃) causes silicon particle coarsening, reducing strength by 15%. |
Prefer use in environments ≤150℃; match with thermal insulation design for high-temperature applications. |
7. Reference Welding Process Parameters
| Welding Method |
Wire Diameter (mm) |
Current Range (A) |
Voltage (V) |
Shielding Gas |
Typical Application Scenarios |
| MIG Welding |
1.2 |
150-250 |
18-26 |
100% Ar |
Automotive components, thin-walled parts of building frames |
| TIG Welding |
2.4 |
120-200 |
16-22 |
100% Ar |
Pressure vessels, precision instrument repair |
| Pulsed MIG Welding |
1.6 |
180-300 |
20-28 |
Ar + 30% He |
Thick plate welding (>6 mm), weld penetration increased by 20% |
| Flame Brazing |
1.6 |
- |
- |
None |
Air conditioning pipelines, copper-aluminum connections of radiators |
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