Chemical components

Product Description

ER70S-3 is a solid mild steel welding wire compliant with AWS A5.18 standards, designed for gas metal arc welding (GMAW/MIG) of mild and low-alloy steels using clean, oil-free base materials. Featuring a composition with 0.06-0.15% carbon, 0.90-1.40% manganese, and 0.45-0.75% silicon, it provides good deoxidation for welding on clean steel surfaces. The lower deoxidizer content compared to ER70S-6 makes it more economical while still delivering excellent weld metal properties for applications with proper joint preparation. Compatible with 75% Argon/25% CO2 or 100% CO2 shielding gases, it produces smooth welds with good mechanical properties.

Features

▪ Good Deoxidation for Clean Steel: The moderate silicon and manganese content provides adequate deoxidation for welding on clean, rust-free steel surfaces. Requires more stringent joint preparation compared to higher-silicon wires but delivers excellent results on properly prepared materials.
▪ Excellent Mechanical Properties: Delivers tensile strength of 480-660 MPa, yield strength ≥400 MPa, and elongation ≥22%. The balanced composition ensures mechanical properties matching mild steel base materials when used on clean surfaces.
▪ Cost-Effective Performance: The lower alloy content compared to ER70S-6 and ER70S-2 makes it an economical choice for applications where base materials are clean and properly prepared. Provides good weld quality at lower cost for high-volume production.
▪ Smooth Arc Operation: Produces a stable arc with good bead wetting and minimal spatter when used with appropriate shielding gases. Feeds smoothly through MIG guns and provides consistent droplet transfer in flat and horizontal positions.

Applications

▪ Ideal for high-volume production welding on clean steel where cost efficiency is important, ER70S-3 is widely used in:
▪ Automotive Manufacturing: Body shop welding of clean, degreased automotive steel panels and components where joint surfaces are properly prepared and cleaned before welding.
▪ High-Volume Production: Manufacturing operations using properly prepared steel requiring economical wire consumption with good weld quality. Suitable for automated and robotic welding systems.
▪ Structural Fabrication: Light structural steel fabrication using clean, mill-scale-free materials. Most effective when base materials are cleaned or pickled prior to welding.
▪ General Manufacturing: Equipment fabrication and light manufacturing where material preparation standards ensure clean welding surfaces. Suitable for indoor production environments with proper material handling.