What is critical Have a clean surface (free of dust, grease) Heat the joint evenly to brazing Temperature Choose the right brazing alloy for the job (Mg content !) Select the appropriate flux to remove the oxide skin from the faying surfaces of the joint Use a capillary gap of the appropriate size ALUMINIUM BRAZING […]
U‐shape brazing alloys with flux integrated into material Advantages Reduced labor cost Reduced waste No post-braze cleaning Flexible design Multiple applications Ideal geometry for feeding No hidden flux voids Precise control of alloy and flux Ideal for Preforms Unlimited preform options Flux flows unobstructed NON‐CORROSIVE FLUX No post braze cleaning required, reducing the environmental […]
Selecting the Correct Flux –WHAT? The first requirement of an Aluminium brazing is to be chemically effective. Fluxes are categorized as active (corrosive) and inert (noncorrosive). Fluoride base fluxes → NON‐CORROSIVE The fluxes leave the white gritty residue on the part. These fluxes include the higher temperature potassium aluminium fluoride and the lower activated cesium […]
Aluminium joining – Brazing ‐ Flux function What is brazing? Brazing is the joining of metals using a molten filler metal. On melting, the filler metal spreads between the closely fitted surfaces, forms a fillet around the joint and on cooling forms a metallurgical bond. By technical definition ‚brazing‘ is a joining process in which the filler metal […]
On October 13th and 14, 2015, the European Association for Brazing and Soldering (EABS) together with experts from Solvay Fluor and Solvay Flux, has held the 14th annual Technical Seminar on the Theory and Practice of Flame and Furnace Aluminium Brazing – short: The Aluminium Brazing Seminar. The delegates were representing technical staff, design […]
DVS-TV was underway at the 4th International Congress on „Aluminium Heat Exchanger Technologies for HVAC&R“ in Düsseldorf, Germany, which took place in June 2015. The interesting video report is online since beginning of August. Among other things, coverage included Solvay’s presence and an interview with Dr. Hans-Walter Swidersky about NOCOLOK® Li Flux. Watch the video.
Part: 1: Flux Paints and Pastes – Part 1 Flux and Braze Paste Characteristics The purpose of flux and/or braze pastes is to provide an initial or supplemental volume of flux and/or filler metal in the form of a viscous liquid at or near the interface of two components: Folded tube seams Tube to header joints […]
Concept and Definitions In addition to the standard methods of applying flux to heat exchanger components (wet fluxing and dry fluxing), there is an increasing trend to using sophisticated flux formulations for selective pre-fluxing of components and/or localized fluxing of complicated geometries. The driving force behind this trend is multi-faceted: heat exchanger manufacturers are seeking […]
EABS and Solvay Special Chem announce the thirteenth annual presentation of their joint technical training seminar. Dates: 13th and 14th October 2015 Purpose of the Seminar: This technical training seminar will be presented in English at the Conference Centre and laboratories of SOLVAY GmbH, in Hannover, Germany. It will provide information concerning the manufacturing practices […]
Flux-Green-Filler-Stop (GFS) “stops” molten brazing filler metal from flowing into areas where it is unwanted, thus the surfaces remain clean and free from the presence of any filler metal. Brazing filler metals do not like to bond with, or flow over, any dirt, grease, or oxides so the presence of any of such contaminants can […]