73115B - Hobart Megafil 731B .045 Metal-Cored Wire 35lb Spool

High-Strength Seamless Metal-Cored Wire

The Hobart Megafil 731B is a premium .045-inch metal-cored welding wire designed for critical applications requiring high tensile strength and superior toughness. Manufactured with Hobart's proprietary seamless technology, this wire features a hermetically sealed copper coating that completely protects the internal flux from moisture absorption. This design ensures extremely low diffusible hydrogen levels (typically less than 4ml/100g), making it an ideal choice for welding high-strength low-alloy steels where hydrogen-induced cracking is a concern.

Engineered to meet AWS E110C-K4 specifications, the Megafil 731B delivers a tensile strength in the 110,000 psi class, making it suitable for heavy-duty structural fabrication. It offers excellent impact toughness even at temperatures as low as -40°F (-40°C). The wire is designed for use with Argon/CO2 shielding gas mixtures, providing a smooth, stable arc with minimal spatter and slag, which significantly reduces post-weld cleaning time.

This 35 lb spool is optimized for industrial environments, including the fabrication of cranes, offshore structures, and heavy earth-moving equipment. The seamless nature of the wire also provides excellent feedability and contact tip life, essential for both manual and robotic welding operations. By combining high deposition rates with robust mechanical properties, the Megafil 731B maximizes productivity without compromising weld integrity.