The type of brazing that works at lower temperatures is called low temperature brazing. The most commonly used low temperature brazing alloys are the silver bearing pastes. These pastes can be used to braze most ferrous and non-ferrous base metals, with the exception of aluminum, titanium, and magnesium.
Low temperature brazing typically involves heating the assembly to a temperature slightly above the melting point of the brazing alloy. The brazing alloy then melts and flows into the joint, creating a solid bond upon cooling. The time at brazing temperature should be just long enough to ensure that all sections of the part reach the desired temperature.
The brazing temperature should be the lowest possible within the recommended range. At lower temperatures, the molten brazing alloy will be more sluggish and less reactive with the base metal. This is beneficial when brazing thin materials or when trying to fill large gaps.
After the brazing process is complete, the work is allowed to cool slowly to solidify the filler metal. Parts can then be rapidly cooled by gas quenching, typically using a gas quenching process with a pressure of around 2 bar.
In summary, low temperature brazing, using silver bearing pastes, is the type of brazing that works at lower temperatures. It involves heating the assembly to a temperature slightly above the melting point of the brazing alloy, allowing it to flow into the joint and create a solid bond upon cooling.
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