ECDF1/2 - Harris Al-Braze Aluminum Brazing Flux Powder 1/2 lb Jar

Technical Overview of Harris Al-Braze Flux

The Harris Al-Braze® is a high-performance powdered flux engineered specifically for the brazing of aluminum and aluminum alloys. Formulated to meet the rigorous AWS A5.31 Type FB1-A specifications, this flux serves a critical role in the thermal joining process by effectively dissolving refractory aluminum oxides that form rapidly on the surface of base metals. Its chemical composition is tuned to be active within a temperature window of 500°C to 700°C. This range is strategically selected to overlap with the melting points of common aluminum brazing filler metals, such as the 4047 (formerly 718) alloy, while remaining safely below the melting point of the base materials to prevent structural failure during the heating cycle.

In industrial applications, the flux's ability to reduce surface tension is paramount. By promoting wetting and capillary action, Al-Braze ensures that the filler metal flows smoothly into the joint, creating a hermetic and mechanically sound bond. It is particularly effective on common aluminum grades including 1100, 3003, and 6061. The product is supplied in a granular powder form, which offers flexibility in application methods; it can be applied directly to the heated rod or mixed with a carrier vehicle—typically water or alcohol—to create a homogenous paste. This adaptability allows operators to tailor the viscosity and application method to the specific geometry of the workpiece, ensuring comprehensive coverage and oxide protection throughout the brazing cycle.

Post-process handling is a critical consideration for this chemical agent. As a corrosive flux, residues remaining after the brazing operation must be thoroughly removed to prevent long-term corrosion of the aluminum assembly. The flux residue is soluble, facilitating removal through mechanical cleaning or warm water rinsing. Users must adhere to safety protocols regarding fume extraction and personal protective equipment, as the reaction products and flux vapors can be hazardous. The 1/2 lb jar packaging provides a sufficient quantity for substantial maintenance and repair operations or small-scale production runs.