ER70S-6 Carbon Steel Welding Wire — Factory Direct Supplier | Huaxia-Steel

Huaxia-Steel supplies ER70S-6 carbon steel welding wire in 0.8–1.6 mm diameters on 5 kg, 15 kg, and 350–500 kg spools and drums, with copper-coated or copper-free finishes, certified to AWS A5.18 / EN ISO 14341-A and backed by full batch test reports. As the workhorse MIG/MAG wire for structural steel, pipe fabrication, and general manufacturing, ER70S-6 delivers reliable welds on slightly rusty or mill-scaled plate thanks to its elevated deoxidizer content — which is exactly why it dominates global consumable volume.

Product Overview

ER70S-6 is a copper-coated solid wire with higher manganese (1.40–1.85%) and silicon (0.80–1.15%) than ER70S-3, giving it stronger deoxidizing power. That chemistry pulls oxygen and contaminants out of the weld pool, so it tolerates surface oxides that would cause porosity with cleaner-chemistry wires, and it produces higher tensile and yield strength deposits with good bead appearance. The wire is drawn to tight diameter tolerance, coated for contact-tip current transfer and corrosion protection during storage, and spooled with controlled cast and helix so the wire feeds straight at high duty cycles on robotic lines.

Specifications

Parameter	Details
Classification	AWS A5.18 ER70S-6 / EN ISO 14341-A-G 3Si1
Diameters	0.8 / 0.9 / 1.0 / 1.2 / 1.6 mm (0.030″–0.062″)
Diameter tolerance	+0.01 / −0.03 mm
Packaging	1 kg, 5 kg plastic spools; 15 kg steel spool; 250–500 kg drums
Shielding gas	CO₂, 75–80% Ar / CO₂, or Ar/CO₂/O₂ mixes
Copper coating	Standard; copper-free (eco) option on request
Cast & helix	Cast ≥ 25 mm, helix ≤ 25 mm at 6.3 m arc height (feeds straight)
Spool feed quality	Random-wound, anti-tangle layering for robotic feed

Chemistry and Mechanical Properties

Element (%)	AWS range	Typical
Carbon	0.06–0.15	0.08
Manganese	1.40–1.85	1.60
Silicon	0.80–1.15	0.95
Phosphorus, max	0.025	0.012
Sulfur, max	0.035	0.012
Copper, max	0.50 (incl. coating)	0.30

Deposit property	With 75/25 Ar-CO₂	With 100% CO₂
Tensile strength	≥ 500 MPa (typ. 550–580)	≥ 500 MPa (typ. 540–570)
Yield strength	≥ 420 MPa (typ. 460–500)	≥ 420 MPa (typ. 440–480)
Elongation	≥ 22%	≥ 22%
Charpy V-notch −29°C	≥ 27 J (typ. 60–100 J)	≥ 27 J

Recommended Welding Parameters

Wire Ø	Position	Wire feed (m/min)	Current (A)	Voltage (V)
0.8 mm	Flat / horizontal	4–11	70–180	15–20
1.0 mm	Flat / horizontal	4–10	90–220	16–22
1.2 mm	Flat / horizontal	4–12	120–320	18–28
1.2 mm	Vertical up / overhead	3.5–6	110–160	17–20
1.6 mm	Flat / horizontal	4–8	180–380	22–30

Short-circuit transfer below ~200 A suits sheet metal and root passes; globular transfer occurs with pure CO₂ in the mid-range; spray transfer above ~24 V with argon-rich gas suits downhand heavy sections. For robotic and tandem lines, we recommend the 1.0 mm diameter — the best balance of feed stability, deposition rate, and tip life.

Manufacturing Standards and Quality Control

Wire is produced from low-residual rod, drawn in multiple passes, and inspected per AWS A5.18 and ISO 544. Batch controls include: chemistry analysis per heat and per drawn lot, diameter run-out measurement, tensile test of the wire itself, cast and helix measurement, coating weight (copper 0.05–0.25 µm typical), and all-weld-metal test joints with tension and Charpy results reported per batch. Every spool carries batch identification that maps to the test certificate; drums carry the same traceability on the drum label and inner liner. Our wire feeds on mils-class robotic lines at 98%+ arc-on stability in customer trials, and we welcome sample spools for your qualification before bulk orders.

Applications

• Structural steel fabrication (S235–S355, A36, A572) for buildings and bridges
• Welded beam, H-section and box girder production lines
• Automotive, trailer and axle manufacturing with robotic cells
• Shipbuilding panel lines and pipe fabrication shops
• General repair and maintenance on carbon steel equipment

Packing, Storage and Shipping

Spools are shrink-wrapped with desiccant options for humid climates, packed 4 spools per carton on export pallets; 15 kg spools ship 2 per carton; drums are lined and palletized with feeding kits available. Store wire in dry areas below 60% relative humidity; once opened, keep spools in plastic wrap and use within weeks in humid environments. Standard export packing withstands ocean freight, and moisture indicator cards can be included on request.