Aluminium
FERVEO ALU 4043
covered electrode · stick electrodeCatalogue only
also as: solid wireTIG rod
AWS class
ER 4043
EN ISO class
S Al 4043 (AlSi5)
Hardness
50 HB
Classification
| AWS class | ER 4043 |
|---|---|
| EN ISO class | S Al 4043 (AlSi5) |
| Other standards | EN ISO 17672: Al 105 · EN ISO 18273: S Al 4043 (AlSi5 · EN ISO 18273: S Al 4043 (AlSi5) |
| Welding process | TIG Welding - Gas Welding |
Purpose
- Al-Si (5% Si) TIG rod for joining and filling aluminum-silicon casting alloys, up to 7% Si.
- Good weld-pool fluidity — favors fill in castings.
Why it works
Silicon (5%) narrows the solidification range and improves weld-pool fluidity compared to a pure-aluminum filler, reducing porosity and the hot cracking typical of welding cast parts — this is why it's the reference filler for joining Al-Si casting alloys, not for general structural use.
Fields of application
- Joining and filling aluminum-silicon casting alloys up to 7% Si.
- Preheating to 150°C recommended on parts thicker than 15 mm.
Chemical composition
| Element | Typical, % |
|---|---|
| Al | balance |
| Fe | 0.5 |
| Mn | 0.03 |
| Si | 5 |
Mechanical properties
| Tensile strength (Rm) | 160 MPa |
|---|---|
| Yield strength (Rp0.2) | 100 MPa |
| Elongation (A5) | 10 % |
| Hardness | 50 HB |
| Density | 2.7 kg/dm³ |
Process
| Polarity | AC |
|---|
Cross-reference
| Replaces EAL 4043 (Magmaweld) | Direct replacement |
| Replaces AS AlSi 5 (Askaynak) | Direct replacement |
Equivalence refers to the classification (AWS / EN ISO), not to product identity. In applications with a qualified procedure (WPS), validate the substitution before use.
Advantages
- Good fluidity — reduces porosity and hot cracking in castings.
- Higher hot-cracking resistance than a pure-aluminum filler.
Limitations
- With Si content, the weld doesn't anodize to the same tone as the base metal — not recommended when an anodized finish is an aesthetic requirement.
- Lower ductility (A5 15%) than this datasheet's Al-Mg alloys — not the first choice for demanding structural use.