Mild Steel Mig Mag Welding Wire ER70S-6
ER70S-6 mild steel MIG/MAG wire is the most widely used solid welding wire (AWS A5.18) — a copper-coated, high-silicon/manganese wire that gives a smooth, stable arc with low spatter and deposits clean, X-ray-quality 70,000 psi welds, even over light rust and mill scale. Available in .023", .030", .035", and .045" on spools and drums.
| AWS Classification | AWS A5.18 ER70S-6 |
| Tensile Strength | 70,000 psi (480 MPa) minimum |
| Shielding Gas | 100% CO² or 75–80% Ar/CO² |
| Polarity | DC+ (DCEP) |
| Wire | Copper-coated, high Mn/Si deoxidizers |
Frequently Asked Questions
What gas do I use with ER70S-6?
100% CO² for deeper penetration with a bit more spatter, or a 75–80% argon / CO² blend for a smoother arc and cleaner beads. Always weld on DC+ (DCEP).
Can ER70S-6 weld over rust and mill scale?
Yes — its extra silicon and manganese deoxidizers make it forgiving on light surface contamination, producing porosity-free, X-ray-quality welds where leaner wires would struggle.
