E70S250 - Harris ER70S-2 Carbon Steel TIG Welding Rod - 3/32 in (2.5mm) - 10 lb Box

Harris ER70S-2 Carbon Steel TIG Rod Technical Overview

The Harris ER70S-2 is a premium-grade, triple-deoxidized carbon steel welding rod designed for Gas Tungsten Arc Welding (GTAW) applications. This filler metal is formulated to meet the rigorous requirements of AWS A5.18 Class ER70S-2. The "S-2" classification denotes a specific chemical composition that includes additions of Aluminum, Titanium, and Zirconium. These elements act as powerful deoxidizers, scavenging oxygen and nitrogen from the weld pool to prevent porosity and inclusions. This makes the rod particularly effective when welding on rimmed, semi-killed, or killed steels, as well as materials that may exhibit minor surface contaminants such as rust or mill scale.

With a tensile strength of 78,000 psi and a yield strength of 60,000 psi, this rod provides structural integrity suitable for critical applications, including pressure piping and structural fabrication. It is widely recognized as the industry standard for root pass welding on carbon steel pipes due to its flow characteristics and ability to bridge gaps while maintaining a sound metallurgical bond. The rod operates on Direct Current Straight Polarity (DCSP/DCEN), ensuring deep penetration and a stable arc.

This 10 lb box contains 36-inch cut lengths with a diameter of 3/32" (approx. 2.5mm). The manufacturing process ensures a clean surface finish on the rod itself, minimizing the introduction of hydrogen or other contaminants into the weld zone. It is suitable for all-position welding, making it a versatile choice for maintenance, repair, and operations (MRO) as well as production manufacturing environments.

Technical Specifications and Compliance

The Harris ER70S-2 conforms to AISI/AWS/ASME SFA 5.18 standards. It is engineered to provide defect-free deposits when used with 100% Argon shielding gas. The triple deoxidation practice not only aids in porosity control but also contributes to a fluid weld puddle that wets out smoothly at the toes, reducing the need for post-weld grinding or cleanup. This product is essential for fabrication shops dealing with ASTM A36, A53, A106, and other common carbon steel grades.