S669110-055 - Hobart HN-521 SAW Flux 50lb Bag

High-Performance Submerged Arc Flux

The Hobart HN-521 Sub-Arc Flux is a premium consumable designed for demanding industrial submerged arc welding (SAW) applications. Engineered by Hobart, a leader in welding filler metals, this flux is formulated to provide optimal arc stability and weld pool protection during the high-deposition SAW process. The HN-521 composition ensures that the molten weld metal is shielded from atmospheric contamination, resulting in high-quality, defect-free welds with excellent mechanical properties.

This agglomerated flux is suitable for joining carbon and low-alloy steels, making it a versatile choice for structural steel fabrication, heavy equipment manufacturing, and pressure vessel construction. Its particle size distribution is controlled to ensure consistent feeding and coverage, allowing for uniform bead profiles even at high travel speeds. The flux is packaged in a heavy-duty 50-pound bag, designed to protect the material from moisture absorption during storage and transport, ensuring performance consistency from the first weld to the last.

Technically, the HN-521 flux interacts with the welding wire to influence the chemical composition of the weld deposit, often adding deoxidizers or alloying elements to enhance strength and toughness. It is compatible with a range of standard SAW wires, providing flexibility for various welding procedure specifications (WPS). The slag system is designed for easy detachment, often peeling away by itself or with minimal mechanical intervention, which significantly reduces post-weld cleaning time and labor costs.