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The Weld Star GTAW SG1 / ER70S-3 TIG Wire is a copper-coated TIG (GTAW) filler wire specifically developed for mild steel and low-alloy steel welding under shielding gas — typically argon. Designed to deliver dependable mechanical properties and excellent weld bead appearance, this wire produces strong, ductile weld metal with good fusion and minimal spatter.
ER70S-3 is especially suitable when welding steels with varying levels of surface condition - including lightly oxidised or less-than-perfect finishes — where reliable deoxidation and smooth weld flow are desired. Manufactured to consistent quality standards using virgin raw materials, this wire is ideal for structural fabrication, workshop repairs, boilers, frames and general steel welding projects.
Key Features
GTAW SG1 / ER70S-3 Classification: Copper-coated TIG wire formulated for mild steel and low-alloy materials with solid fusion characteristics.
Excellent Arc Stability: Produces a smooth, stable TIG arc for easy handling and high-quality bead formation.
Reliable Deoxidation: Designed to manage mild surface contamination or oxidation, helping avoid weld defects.
Good Mechanical Properties: Weld deposits exhibit balanced strength and ductility suitable for general fabrication and structural use.
