written by Leszek Orman, Radziszow / Poland; Hans-Walter Swidersky, Hannover / Germany Abstract In 2001 and in 2009 respectively, Solvay introduced two new fluxes for aluminium brazing: – NOCOLOK®Zn Flux (a ‘reactive flux’ – for the creation of precisely controlled sacrificial layers on part surfaces); and – NOCOLOK®Li Flux (for improving corrosion resistance of stationary […]
Attachment Powder Fluidity Indicator Definition of the Variables and Calculation of the Results Preliminary remark: The spraying factor Rm is a relative value for the evaluation of powders used for dry fluxing – especially when the material transport in the used equipment depends on the fluidization property of the powder. Expansion factor: Expansion factor […]
The Theory and Practice of the Flame- and Furnace-Brazing of Aluminium Dates: October 9 & 10, 2018 in Hannover/Germany Purpose of the Seminar: The language of the seminar is English. It will take place in the Conference Center and laboratories of Solvay GmbH, in Hannover, Germany. It will provide information concerning the manufacturing practices commonly used […]
The 10th International Congress and Exhibition Aluminium Brazing, organised by the DVS German Welding Society, will take place from 12 – 14 June, 2018 in Düsseldorf/Germany in the Radisson Blu Scandinavia Hotel. Leading specialists and authorities from the sector, well known experts from industry and research and other important decision makers from this field will […]
Flux Transfer Systems in Electrostatic NOCOLOK® Flux Application For these experiments, a fluxing booth from Nordson designed for semi-continuous production was used. This unit’s (216 cm height, 143 cm width, 270 cm depth) key components are a hopper, a spray gun, two filter cartridges and the necessary control units. The work piece is placed […]
Flux Powder Adhesion: Dust formation and flux fall off are of general interest to the brazing industry. Regardless of the application method, dust generation (particularly airborne fines) must be avoided or kept to a minimum. If dust formation cannot be prevented, local exhaust ventilation and meticulous housekeeping are recommended. The inhalation of flux dust […]
Experiments for Flux Powder Fluidization: To illustrate the relationship between flux properties and fluidization, a series of tests was carried out using Sample 1 and Sample 2. Attached are print-outs of the particle size distribution analysis (Sympatec Helios H0851; dry powder analysis with laser) of both materials. Table 1: Particle Size Distribution Sample 1 […]
Flux Powder Fluidization: In an effort to develop a flux with more desirable properties for electrostatic application, the first step is to qualify criteria. In summary of the above, it is apparent that fluidization is one of them. There is standard equipment available on the market to quantify fluidization characteristics. However, when we tested […]
The background of electrostatic flux application: When controlled atmosphere brazing with non-corrosive fluxes was introduced, the only realistic method for using the flux was wet application. This strategy was supported by the physical and chemical properties of flux powder. Non-corrosive fluxes for aluminum brazing consist of potassium fluoroaluminates (inorganic fluorides) with low water solubility. […]
Introduction: This article summarizes some experimental results of a project on electrostatic application of non-corrosive fluxes for aluminum brazing. The objective is to qualify and quantify flux powder properties and equipment parameters with positive effect for dry flux technology. For more than 30 years, controlled atmosphere brazing (CAB) [NOCOLOK ® Flux brazing] has been […]