What makes our Brazing Paste different?

The basis for Fusion’s industry changing brazing pastes is a unique carrier binder system. This holds a finely atomised filler metal, and in some cases an oxide removing proprietary flux, in a stable suspension.

These binders are specifically formulated to ensure optimum characteristics regardless of the application method or brazing process. Our binder systems fall into two main groups: ‘fluxless’ and ‘fluxed’ binder carrier systems.

Fluxless binder systems for brazing paste

Fluxless binder systems are primarily utilised in a variety of brazing furnace operations. However, they also can be tested in select flame or induction systems depending on the context.

Applications where a fluxless system may be implemented include:

• atmospheric furnace
• vacuum furnace
• open air (when paired with a self-fluxing phos-copper alloy)
• flame when used with gas flux
• in a special induction machine containing an atmospheric chamber

Fusion offers a diverse portfolio of fluxless binder systems optimised for a variety of application methods (e.g. machine dispensing, dip/roll coat, stencil, squirt bottle) and “staged properties” (i.e. adhesion, slump, dry time).

Further advantages of fluxless brazing paste systems include their potential for higher alloy loading than traditional fluxed paste systems, which helps to minimise residue in furnace applications.

For more details of Fusion’s fluxless binder brazing paste systems, and the appropriate conditions for various applications, please contact us.

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.