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The ER70S-2 Mild Steel TIG Rod is a premium carbon steel filler metal designed for the Gas Tungsten Arc Welding (GTAW) process. Distinguished by its "triple deoxidized" composition, this alloy contains specific additions of Zirconium, Titanium, and Aluminum, along with the standard Silicon and Manganese found in other mild steel wires. This potent chemical profile gives the molten weld pool superior scavenging capabilities, allowing it to effectively trap and float out oxygen and nitrogen impurities. The result is a weld deposit with exceptional resistance to porosity, even when welding over rimmed steels, mill scale, or light rust.
In critical applications such as pipe welding (ASME B31.1/B31.3) or pressure vessel fabrication, the integrity of the root pass is paramount. ER70S-2 is widely preferred for root passes on carbon steel pipe because of its ability to wet out smoothly and tie into the sidewalls without creating defects. The 2.5mm diameter provides excellent control for the welder, allowing for precise manipulation of the puddle. It produces a flat weld bead with a fluid consistency, reducing the risk of lack of fusion. The mechanical properties of the deposited weld metal are robust, typically offering a tensile strength exceeding 70,000 psi, making it suitable for structural applications.
When using this rod, 100% Argon shielding gas is recommended to maintain arc stability and prevent atmospheric contamination. The rod is designed for DCEN (Direct Current Electrode Negative) polarity. Unlike ER70S-6, which relies heavily on high silicon for fluidity (sometimes resulting in excessive glass-like silica islands), ER70S-2 produces a cleaner deposit with fewer islands, simplifying inter-pass cleaning. For welders facing real-world fit-ups where perfect metal preparation isn't always feasible, the deoxidizing power of ER70S-2 acts as an insurance policy against pinholes and internal porosity.
| Additional Information |
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| Aws Spec:ER70S-2 |
| Diameter:2.5mm (3/32") |
| Grade:S2 |
| Packaging:1 lb Tube |
| Weld Process:TIG (GTAW) |
| Brand:Generic |
| Material Composition:Mild Steel, Triple Deoxidized |
| Wire Diameter:2.5mm |
| AWS Classification:ER70S-2 |
| Shielding Gas Requirement:100% Argon |
| Packaging Type:1lb Tube |
| Polarity:DCEN |
| Rod Length:36 Inches |
| Packaging Description:1 lb tube |
