What is the most common FCAW structural steel wire?

The most common FCAW (Flux-Cored Arc Welding) structural steel wire used is E71T-1. This wire is specifically designed for welding in various positions and is suitable for carbon and low-alloy steel fabrication. E71T-1 provides high deposition rates and good impact toughness, making it a reliable choice for structural applications.

E71T-1 wire has a unique formulation that allows it to produce welds with excellent mechanical properties and minimal porosity, crucial for meeting structural welding standards and ensuring the integrity of welded structures. This characteristic makes it a preferred option in both field and shop environments, where productivity and weld quality are paramount.

In contrast, the other wires mentioned have different applications or specifications that do not align as closely with the needs of typical structural steel welding. For instance, NR 232 and NR 301 are typically associated with different processes or materials, while ER70S-6 is a solid wire designation for gas metal arc welding (GMAW) processes, not specifically a flux-cored option.