69100509 - Bonarc ER70S-6 .035" Solid MIG Welding Wire - 5kg Spool

High-Performance Mild Steel MIG Wire

The Bonarc ER70S-6 .035" Solid MIG Wire is a premium choice for professional fabricators requiring consistent quality and mechanical integrity in their mild steel welding applications. Supplied in a convenient 5kg (11lb) spool, this wire is perfectly sized for portable MIG machines and smaller workshop setups where maneuverability and space are considerations. The ER70S-6 classification indicates a high content of deoxidizers, specifically manganese and silicon, which are essential for combating porosity when welding over mill scale, light rust, or oil.

One of the standout characteristics of this Bonarc wire is its precision winding. Unlike random-wound spools that can snag or tangle, causing frustrating downtime and burn-backs, this wire is layer-wound to ensure smooth, uninterrupted feeding through the liner and contact tip. This results in a stable arc and consistent deposition rates, critical for achieving high-quality welds in production environments.

The chemical composition is optimized to produce a highly fluid weld pool with excellent wetting properties. This ensures the weld metal ties in smoothly at the toes, reducing the risk of lack of fusion and creating a flat, aesthetically pleasing bead profile. Whether used with 100% CO2 for deep penetration or an Argon/CO2 blend for reduced spatter and better cosmetics, this wire delivers reliable performance across a wide range of parameters.

Key Technical Benefits

• Enhanced Deoxidation: High silicon levels help scavenge impurities, making it more forgiving on base metals that aren't perfectly clean.


• Versatile Shielding Gas: Compatible with both straight CO2 and Argon-based mixtures, offering flexibility depending on the required penetration and bead appearance.


• Mechanical Toughness: Provides excellent impact toughness even in low-temperature conditions, suitable for structural applications.