Titanium Brazing Flux

Guidelines to Working with the Titanium Flux

Titanium Brazing Flux is composed of various fluorides enclosed in a binder. The flux is formulated for use with our proprietary silver-bearing alloy, TBA-1. Upon heating the titanium brazing flux, the flux’s binder burns off; the inorganic fluorides sinter and then melt at about 1000-1100°F (538-590°C). When molten the titanium brazing flux protects the titanium substrate from oxidation. However the titanium brazing flux no longer protects the titanium against oxidation if the substrate is heated much above 1500°F/815°C (cherry red).

Following are directions for achieving the best results:

• Place generous amounts of titanium brazing flux on the area to be joined.
• Heat the area surrounding the joint  to bring the substrate up to temperature.
• Gradually move the heat source closer and closer to the joint until the titanium brazing flux has melted and is protecting the titanium parts.
• Introduce the silver alloy to the joint area when the temperature of the titanium parts exceeds the liquidus temperature of the alloy, but not much higher.

NOTE: Titanium oxidizes rapidly at elevated temperatures, and it is critical to work in the temperature zone where the titanium brazing flux is still active and protective. Otherwise, the silver alloy will ball up and not wet the titanium. The titanium brazing flux requires careful working of the torch, so as to stay within the safe temperature range.

There must be a balance between heating the titanium quickly enough to minimize new oxidation formation and heating it gradually enough so that the titanium is hot enough to accept the molten alloy.