ED019587 - Lincolnweld 781 SAW Flux 50lb

High-Performance Flux for High-Speed Fabrication

The Lincoln Electric Lincolnweld® 781™ Submerged Arc Flux is a specialized welding consumable designed to meet the rigorous demands of high-speed fabrication environments. Packaged in a durable 50 lb bag, this flux is engineered to support submerged arc welding (SAW) processes where travel speed and bead consistency are critical. It is particularly effective for applications involving clean plate and sheet steel, making it a go-to choice for industries requiring rapid throughput without compromising weld integrity.

Optimized for Speed and Quality

One of the standout features of Lincolnweld 781 is its "fast follow" characteristic. In automated or semi-automated welding setups, increasing travel speed often leads to defects such as undercut (where the edges of the weld bite into the base metal) or voids. This flux is formulated to freeze and flow in a manner that supports the molten puddle even at elevated speeds, ensuring a uniform weld profile. The result is a smooth, defect-free finish that reduces the need for post-weld grinding or rework.

Application Specifics

This flux is categorized as an active flux, optimized for limited pass welding. It is best suited for single-pass or limited-layer applications rather than deep, multi-pass structural welds on thick sections. Its chemical composition promotes excellent wetting action, allowing the weld metal to tie in smoothly with the base material. Operators will appreciate the stability it provides on thinner gauge materials where burn-through and bead shape control are constant challenges. It meets the EN ISO 14174 – S A ZS 1 standard, confirming its quality and performance metrics for industrial use.

Lincoln Electric Reliability

As part of the renowned Lincolnweld family, the 781 flux represents Lincoln Electric's commitment to providing solutions for specific welding challenges. Whether used in automotive parts manufacturing, tube mills, or general sheet metal fabrication, this flux delivers consistent results. Users should ensure the base material is relatively clean, as this flux is designed for optimal performance on prepared surfaces rather than heavily rusted or contaminated steel.