Solid Wire
ER70S-A1 Welding Wire
ER70S-A1 is copper-coated carbon-molybdenum (0.5Mo) low alloy solid wire, suitable for GMAW (MIG/MAG) and GTAW (TIG) welding processes.
Low Alloy Solid Wire
ER70S-A1 is copper-coated carbon-molybdenum (0.5Mo) low alloy solid wire, suitable for GMAW (MIG/MAG) and GTAW (TIG) welding processes.
Features
• Molybdenum-alloyed weld metal with great medium-temperature creep strength and cold cracking resistance
• Stable arc, minimal spatter, smooth weld bead
-Suitable for carbon-molybdenum heat-resistant steels, continuous service temperature up to 500°C
• PWHT stress relief recommended for pressure parts to maximize high-temperature properties
Diameter & Packaging
MIG：0.8 / 1.0 / 1.2 / 1.6 mm 5KG Spool /15KG Spool
TIG：2.0 / 2.4 / 3.2 mm 5kg plastic tube
Welding Parameters
Polarity: DC+ (DCRP, Direct Current Reverse Polarity)
Shielding Gas
MIG/MAG: Ar + 5%~15% CO₂, Flow rate: 15–20 L/min
TIG: Pure Argon (99.99%)
Preheat & Interpass Temperature
100~150 ℃ for plate thickness ≥12 mm or low ambient temperature
Typical parameters (Φ1.2 mm MAG): Current 180~240 A; Voltage 24~28 V
Deposited Metal Mechanical Properties
Tensile Strength: ≥485 MPa (70 ksi)
Yield Strength: ≥400 MPa
Elongation: ≥19 %
Charpy V-notch: ≥27 J
Applications
Power boiler headers, superheaters, steam pipelines; petrochemical heat exchangers, high-temperature & high-pressure pressure vessels, medium-temperature pipelines for refineries and other C-Mo steel pressure-bearing equipment.
Welding Precautions:
• Not interchangeable with ER70S-6.
• Remove oil, rust and scale on groove to prevent porosity.
• Weld long-term service temperature ≤520°C.
• Follow specifications for PWHT on pressure vessels.