CleanBraze™ Background Hydro Aluminium has developed an inno- vative material concept in order to enable fluxfree processes: CleanBraze™ ! CleanBraze™ – material receives a spe- cial surface treatment. The development was driven by ecological aspects, sub- stantial technological progress as well as supplying the highest level of safety for our customers. Thus, the material pro- vides excellent brazing results given a suitable match in design, brazing parame- ters and low oxygen levels. Concept The objective was to establish a fluxfree brazing process. Using suitable material and appropriate techniques an efficient brazing process can be maintained while eliminating flux. To successfully braze in a fluxfree process, all parameters need to match. Here, the material is just as essen- tial as a corresponding design and a sta- ble atmosphere. At any given time, how- ever, it is possible to react to varying technical conditions – such as a tempo- rarily bad atmosphere – and switch to optional employment of flux. Above and beyond, CleanBraze™ – mate- rial can readily be brazed in a vacuum furnace. This is possible without Mg con- taining filler metals. After receiving Hy- dro`s CleanBraze™ treatment even standard fillers can be vacuum brazed. Advantages No flux residues on brazed parts in- side & outside No flux overspray – Health, Safety & Environment Higher flexibility with regard to prod- uct design: Application of flux is not a limiting factor Products brazed in vacuum due to necessary cleanliness can be switched to CAB Enables fluxfree brazing in CAB fur- naces Enables vacuum brazing without Mg deposits Compatible with existing fluxes Material CleanBraze™ process is independent of core material and temper CleanBraze™ treatment on Hydro HA 4045-D filler clad Standard production of the clad mate- rial – up to 2 clad layers per side Standard material thickness: 0.2 mm – 3 mm Knowledge Transfer CleanBraze™ is in full scale production. Customer tests show excellent brazing results if all process parameters are con- sidered. Hydro is happy to offer technical support in using CleanBraze™ – material. Feel free to take our advice in designing appropriate tests and their conductance. For further information on CleanBraze™, please contact: Hydro Aluminium Rolled Products GmbH Angle-on-Coupon Test: CleanBraze™ material in N2 atmosphere Fillet Forming Test: CleanBraze™ vs.Standard vacuum Filler Contact Bernd Gerdautzki Hydro Aluminium Rolled Products Aluminiumstrasse 21129 Hamburg Germany Phone +49 40 74011 747 Mobile +49 170 22 47 885 e-mail: [email protected] Standard ™