Solid Wire
ER120S-G Welding Wire
ER120S-G is a copper-coated ultra-high strength low alloy solid wire for GMAW (MIG/MAG) and GTAW (TIG). It is designed for welding 120ksi grade ultra-high st...
ER120S-G
ER120S-G is a copper-coated ultra-high strength low alloy solid wire for GMAW (MIG/MAG) and GTAW (TIG). It is designed for welding 120ksi grade ultra-high strength low-alloy structural steels, featuring ultra-high mechanical strength, excellent anti-cracking performance and stable weld joint comprehensive properties.
Features
• High-purity low-alloy ratio provides ultra-high tensile and yield strength, fully meeting the welding technical requirements of 120ksi super high-strength steel structures.
• Superior resistance to hydrogen cold cracking and brittle fracture, stable structural performance under ultra-high stress and high-rigidity working conditions.
• Stable arc performance, low spatter rate and flat and delicate weld bead, reducing post-weld polishing and finishing workload.
• Precise component control and excellent process adaptability, ensuring stable and consistent mechanical properties of welded joints.
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)
Shielding Gas
MIG/MAG: Ar + 5%~15% CO₂, Flow rate: 15–20 L/min
TIG: Pure Argon (99.99%)
Preheat & Interpass Temperature
160~210 ℃ for thick plates or high-restraint joints to effectively prevent hydrogen-induced cold cracking and weld brittleness.
Typical Φ1.2 mm MAG parameters: Current 120~180 A; Voltage 19~23 V
Deposited Metal Mechanical Properties
Tensile Strength: ≥830 MPa (120 ksi)
Yield Strength: ≥730 MPa
Elongation: ≥12 %
Charpy V-notch: ≥27 J (Room temperature)
Applications
Suitable for welding 120ksi grade ultra-high strength low-alloy structural steels. Widely used in super-large crane equipment, heavy load engineering machinery, high-rise high-strength steel structures, deep-sea engineering facilities and special high-load pressure equipment.
Welding Precautions
• Specialized for 120ksi ultra-high strength structural steel welding; not applicable for heat-resistant steel, cryogenic steel, stainless steel or other dissimilar steel welding.
• Thoroughly remove oil, rust, scale and moisture on the welding groove and surrounding base metal to avoid porosity, slag inclusions and other welding defects.
• Strictly implement standardized preheating and interpass temperature control to reduce welding residual stress and avoid brittle cold cracking.
• Mandatory professional post-weld heat treatment for thick-wall and ultra-high load components to stabilize weld structure and optimize mechanical properties.
• Not suitable for long-term service in high-temperature, low-temperature and strong corrosive working environments.