3670S2125 - ER70S-2 Mild Steel TIG Welding Rod - 3.2mm (1/8") - 10lb Tube

Technical Overview: ER70S-2 Carbon Steel TIG Rod

The ER70S-2 is a premium, triple-deoxidized mild steel welding rod designed for the Gas Tungsten Arc Welding (GTAW) process. This specific consumable is engineered with a 3.2mm (approximately 1/8 inch) diameter, making it suitable for filling joints in medium-to-thick sections of carbon steel. The "S-2" classification denotes a specific chemical composition that includes Zirconium (Zr), Titanium (Ti), and Aluminum (Al) in addition to the standard Silicon and Manganese deoxidizers found in other mild steel wires. This unique chemistry provides exceptional scavenging capabilities, allowing the molten pool to trap and float out impurities such as oxygen and nitrogen, which significantly reduces porosity in the final weldment.

This rod is particularly favored in industrial applications involving pipe welding, specifically for root passes where integrity is paramount. The 3.2mm diameter offers a substantial deposition rate while maintaining the control necessary for critical joints. It meets AWS A5.18 specifications, ensuring consistent mechanical properties, including a typical tensile strength of 70,000 PSI. The triple-deoxidized nature of this alloy makes it the preferred choice when welding on base metals that may not be perfectly clean, exhibiting tolerance to light rust, mill scale, and oil without compromising the radiographic quality of the weld.

Packaged in a durable 10lb tube, these cut lengths are designed for professional storage and ease of access. The rod exhibits excellent wetting characteristics, ensuring a smooth transition at the toes of the weld and reducing the likelihood of undercut. It is compatible with 100% Argon shielding gas and is typically operated using DCEN (Direct Current Electrode Negative) polarity. For maintenance, repair, and operations (MRO) environments where base metal preparation cannot always be perfect, the ER70S-2 chemistry provides a safety margin against weld defects that standard ER70S-6 wires cannot match.