The inert gas commonly used during brazing is argon. Argon is favored in many vacuum brazing shops due to its inert nature, which means it does not react with any of the metals being heat-treated or brazed in vacuum furnaces. This property ensures that the metals maintain their integrity and the brazing process is not compromised by any chemical reactions with the atmosphere.
Argon is used in various brazing applications, including partial-pressure brazing and rapid-cooling needs. It is also utilized as a gaseous atmosphere to enhance the conduction of heat between components inside the furnace. The use of argon is particularly beneficial because it helps in maintaining a controlled environment that is devoid of oxidants, oxygen, and water, which are detrimental to the brazing process.
The atmosphere during brazing must meet specific conditions to ensure the quality of the brazed assembly. These conditions include a neutral gas environment (often pure nitrogen), an oxygen content of less than 100 ppm, and a humidity level below -40°C. Argon, being an inert gas, helps in achieving these conditions, thereby preventing the reformation of oxide layers and corrosive substances like hydrofluoric acid.
In summary, argon is the preferred inert gas for brazing due to its non-reactive nature with metals, its ability to create a controlled environment free from oxidants, and its effectiveness in facilitating heat conduction during the brazing process.
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