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

Achieve X-Ray Quality Welds on Dirty Steel

If you are TIG welding mild steel and need a rod that forgives a little bit of rust or mill scale, the ER70S-2 is your best friend in the shop. This 3.2mm (1/8") rod is the "triple deoxidized" powerhouse of the mild steel family. Unlike standard filler metals, this rod is packed with special cleaners—Titanium, Zirconium, and Aluminum—that actively fight porosity while you weld. When you dip this rod into the puddle, you'll notice it flows smoothly and helps float out impurities, leaving you with a clean, solid bead that is ready to pass X-ray inspection.

This size, 3.2mm, is perfect for when you need to lay down some serious metal on thicker plate or pipe. It is stiff enough to feed easily without whipping around, giving you precise control over the puddle. It is widely known as the go-to rod for pipe welders, especially for that critical root pass where there is no room for error. Even if the prep work isn't 100% perfect (we've all been there), the S-2 chemistry helps prevent those frustrating pinholes that can ruin a day's work.

The 10lb tube keeps your rods straight, dry, and ready for action. Whether you are fabricating structural frames, fixing heavy equipment, or welding pressure piping, this rod gives you the confidence that the metal you are putting down is sound. It wets out nicely at the edges, helping you avoid undercut and making your stack of dimes look professional. Grab a tube of ER70S-2 when you need versatility and reliability on carbon steel projects.