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Brazing pastes offer numerous advantages over solid forms of brazing media such as rods and preforms. Brazing paste is very versatile and is as well-suited to high throughput, fully automated production environments as it is to lower throughput, semi-automated or manual production processes.
The brazing paste comprises a filler metal, a flux and a specially engineered, proprietary binder system. With a large number of fluxed and flux-less binder systems available along with multiple different alloys, there is great scope to tailor a product which is optimised to meet the temperature ranges and brazing requirements of specific customer applications.
Key advantages to brazing with paste over other forms of braze media are:
- Flux type, filler metal type, metal content and powder particle size can all be adjusted in a brazing paste to provide a tailored solution optimised for a huge range of manufacturing applications.
- Brazing paste is a homogeneous blend of filler metal and fluxed binder that can be applied directly to the assembly; this eliminates the pre-fluxing step that is required with metal pre-forms and helps to minimise material waste and improve production efficiency.
- Brazing paste lends itself to semi- and fully-automated production environments where high throughput of assemblies is required.
- Brazing paste can be used with all heating methods including flame, induction and furnace.
- Brazing paste can be used for all joint shapes, an advantage over metal preforms which are part-specific with each joint requiring its own engineered shape and volume.
- Reduced risk of overheating: Some traditional brazing methods run the risk of overheating components, which can lead to damage. Fusion brazing paste can help reduce this risk by distributing heat in a controlled and even manner.
- Oxidation resistance: Fusion brazing pastes can provide additional protection against oxidation of surfaces of brazed components, which can be critical for oxidation-sensitive joints.
- Easier to clean: Once the brazing process is complete, the brazing paste residue can be easily removed, making components easier to clean than traditional methods.
Fluxed binder carrier systems
The key ingredient in Fusion’s fluxed binder system is a proprietary flux. The role of this flux is to remove surface oxides and prevent reoccurrence of filler and base metal oxidation during open air brazing applications.
Industry standards dictate the performance criteria and include general chemical family requirements which often impact activation temperatures and residues. However, the flux itself remains a proprietary formulation.
The table in our brochure provides a starting point for identifying the flux required to properly join base materials based on their composition and the filler metal selected for the joint.
Fluxed binder systems incorporate a variety of fluxes as well as the brazing filler metal in suspension. These binder systems are optimised for Fusion’s automated dispensing systems, providing the benefit of improved application consistency.
Although we offer a wide variety of fluxed binder systems, our technical team can make minor modifications to customise each system for a customer’s specific application requirements. As such, the physical properties of each binder system can vary to ensure optimum results for a variety of factor,s including joint design, fliler metal composition/loading, part fixture orientation, brazing process, and temperature constraints.
Since brazing fluxes are composed of chemically active – and often corrosive – materials, their post-braze residue should typically be removed to minimise corrosion issues and ensure joint integrity.
For more details of our most common fluxed binder brazing paste systems, and the appropriate conditions for various applications, please contact us.
