Monolith ER70S-6 MIG Welding Wire – Copper-Coated Mild Steel (0.035” / 0.9mm)

The Monolith ER70S-6 MIG Welding Wire is a premium copper-coated solid wire engineered for consistent arc performance, excellent bead appearance, and strong mechanical properties. Designed for general fabrication, repair, and production welding, this wire excels in applications where clean welds and reliable penetration are critical.

With enhanced levels of manganese and silicon, ER70S-6 delivers superior performance when welding over light rust, mill scale, or surface contaminants, making it a go-to choice for real-world shop conditions.

🔧 Key Features

• AWS A5.18 ER70S-6 Certified
  Trusted industry-standard wire for MIG (GMAW) welding
• Copper-Coated for Smooth Feeding
  Reduces wear on liners and contact tips while improving conductivity
• Excellent Arc Stability & Low Spatter
  Clean welds with minimal cleanup required
• High Strength & Ductility
  Ideal balance of tensile strength and elongation
• Works on Dirty or Scaled Steel
  Enhanced Si & Mn content improves weld quality on imperfect surfaces

⚙️ Specifications

• Diameter: 0.9 mm (0.035")
• Spool Size: 18 kg (39 lb) – BS300 / KS300
• Polarity: DC Reverse (DCEP)
• Coating Type: Copper-Coated

🛡️ Certifications & Standards

• AWS A5.18: ER70S-6
• CSA W48: B-G 49 A 3C 1 S6 (ER49S-6)
• EN ISO 14341-A: G 42 4 M21 3Si1

Built to meet North American and international welding standards.

📊 Mechanical Properties (Typical)

• Tensile Strength: 604 MPa (87 ksi)
• Yield Strength: 472 MPa (68 ksi)
• Elongation: 27%

Provides strong, ductile welds suitable for structural and general fabrication work.

🧪 Chemical Composition (Typical %)

• Carbon (C): 0.072
• Manganese (Mn): 1.61
• Silicon (Si): 0.95
• Phosphorus (P): 0.016
• Sulfur (S): 0.019

Optimized chemistry for improved wetting, penetration, and bead profile.

🔥 Recommended Welding Parameters (0.035” / 0.9mm)

• Amperage: 70 – 175 A
• Voltage: 16 – 22 V
• Wire Feed Speed: 160 – 400 m/h
• Gas Flow Rate: 8 – 10 L/min
• Shielding Gas: Typically 75/25 Ar/CO₂ (M21)

📍 Welding Positions

Suitable for multiple positions, including:
Flat (PA), Horizontal (PB), Vertical (PF), and Overhead (PE)