NOCOLOK® Flux - Markets & Applications

Applications Brazing Process Flame Brazing Furnace Brazing Technical Center  Applications Brazing agent: - as combined brazing and fluxing agent for   brazing of aluminium Refrigeration Application NOCOLOK Flux is the ideal fluxing agents for joining: - Condensers - Evaporator - Accumulator assemblies     Tube connections Tubes connections of various metals Al/Al, Al/Cu, Al/Messing, Al/Stahl which results in high integrity tube joints.     Household NOCOLOK Flux is the ideal fluxing agents for joining: - Pots and pans - Caffee maschines, Kettels,Clothes dryers, Irons, etc.     Automobil sector NOCOLOK Flux is the ideal fluxing agents for joining: Radiotors, Oil coolers, Condensers, Evapoators, Heat cores, Tubes connections, Accumulator Assemblies.     Brazing Process NOCOLOK Flux brazing is carried out in an inert nitrogen atmosphere in either batch type furnaces or more commonly in continuous tunnel furnaces. NOCOLOK Flux used in the process, once molten, works by dissolving the tenacious oxide film present on aluminum and prevents further oxidation. The first step in any successful brazing operation is the removal of residual lubricants and forming oils. The flux wets the faying surfaces of the components to be joined allowing the filler metal to be drawn freely into the joint by capillary action. Upon cooling, the flux remains on the surface as a thin strongly adherent film. No post braze treatment is required. Flame brazing with NOCOLOK Flux Furnace brazing with NOCOLOK Flux Flame brazing with NOCOLOK Flux   Equipment In many cases, a second brazing operation is required to braze connections and fittings to the furnace brazed components. In other instances, parts with simple joint configurations can be successfully flame brazed. For manual brazing a double headed torch with multi orifice tips For automatic brazing caroussel or shuttle Consumables Gas: oxygen/propane oxygen/methane oxygen/butane oxygen/natural gas Filler alloy: typically AA4047 in straight wire or as perform ring NOCOLOK Flux as paste Preparation Clean to remove residual oil and lubricants Assemble components with filler metal wire/ring in place Flux applied to joint area           Bi-metallic joints Joining Aluminum to other metals is possible, for example Al to Cu. In some cases, no filler metal is required. I.e. the filler metal is created in situ.       Brazing Process Heating Uniform heating of joint area to brazing temperature Brazing The flux melts and dissolves the oxide film around the joint area prior to filler wire melting and forming the joint Post brazing No further treatment is required ? residue can be painted    Furnace Brazing with NOCOLOK Flux   Cleaning      The product typically goes through a cleaning step to remove residual lubricants and forming oils.         Fluxing, Drying    NOCOLOK Flux is then applied to individual parts or assembled units as an aqueous slurry by flooding, spraying or dipping. Blow-Off An air ?blow-off? removes excess slurry Drying After fluxing, the part is dried to prevent moisture from being carried into the brazing furnace   Electrostatic spraying Electrostatic spraying of flux, commonly known as dry-fluxing, is gaining acceptance as an alternate fluxing method. NOCOLOK Flux is applied dryly. Blow-off and drying is not necessary.     Brazing Heating The temperature of the product moving through the heating section is raised uniformly to the target braze temperature.     Brazing The flux melts and dissolves the oxide film on aluminum just prior to the filler metal melting and forming their joints.       Cooling Solidification of flux and filler metal occurs. The flux residue forms a thin adherent film. Inert Atmosphere Nitrogen is introduced in the critical brazing section of the furnace and flows towards the entrance and exit. This prevents ingress of containments from outside the furnace.   Technical Center Welcome at the Technical Center. The objective of our Technical Centers is: To meet customer requests in troubleshooting current NOCOLOK flux use. To demonstrate to prospective customers the NOCOLOK flux brazing technologies. To assist in prototype development. Development of improved fluxes.   Cleaning With a view towards more environmentally friendly degreasing methods, an aqueous degreasing station is available. Here various cleaning methods and aqueous degreasing agents can be evaluated to suit your particular needs. A drying furnace normally used for predrying fluxed parts.     Fluxing-station The fluxing station is designed to apply NOCOLOK flux to all sizes and types of products and components. While the component to be fluxed remains stationary, the spraying apparatus moves on a conveyorized track overhead. The air blow-off apparatus is also attached to the overhead track. These features allow precise control over fluxing and blow-off and can be used to establish proper fluxing practices for any given component.     Electrostatic spraying The Technical Centre is thus equipped with a portable electrostatic spraying apparatus to perform dry-fluxing tests and to determine the suitability of this method for your particular fluxing needs.     The NOCOLOK batch brazing furnace The batch brazing furnace meets all the requirements of full production capacity tunnel furnaces in terms of heating rate, atmosphere purity and temperature uniformity. The maximum size for the component to be brazed is 600 mm width x 600 mm height x 900 mm depth.     Special features Special features such as viewing ports allow a first hand look at brazing in progress. Component temperature uniformity can be monitored closely through the use of numerous thermocouples attached directly to the part. Dewpoint meter and oxygen analyser monitors furnace atmosphere.   Flame brazing with NOCOLOK Flux Our flame brazing station offers the possibility to evaluate alloys, joint configurations, required flux loadings and joint tolerances for the suitability of flame brazing     Corrosion testing Accelerated laboratory corrosion testing is the key element in the early and intermediate stages of product development. Corrosion testing can determine the influence of alloy modifications, production procedures and evaluate corrosion prevention techniques. With a sophisticated corrosion test cabinet numerous accelerated corrosion tests can be performed. Conventional salt spray tests, such as: Neutral Salt Spray Test (ASTM B 117) SWAAT (AST G 85) CASS Test (ASTM B 368) The corresponding DIN corrosion tests, such as: DIN 50.021SS DIN 50.907 The corrosion test cabinet can also perform complex cyclic corrosion tests, such as: GM 95 40 P/B   Analytical Service Die analytical services of the technical center: Metal analysis Scanning Electron Microscope (SEM) X-Ray Diffraction (XRD) Differential Scanning Calorimetry and Thermogravimetric Analysis (DSC, TGA) Particle size analysis In addition to the analytical services, metallographic services are also available.   Glass tube furnace For demonstration or for simple 'fillet tests', the Technical Center is equipped with a portable glass tube brazing furnace. This furnace is a useful tool for demonstration the principles of NOCOLOK Flux brazing in terms of flux melting, filler metal flow and capillary action.     HF Gas Emission Measurements The Technical Centre has a portable HF gas measuring device which can be used to measure HF concentration at levels of 0.6 ppm and above. This device can be used to measure HF concentrations at various areas in and around a furnace installation. List of applications Air Conditioning and Refrigeration   Aluminium heat exchangers   Refrigerants (Solkane) Automotive   Aluminium heat exchangers   Automotive air-conditioning Metals   Aluminium heat exchangers