Induction Brazing
July 19, 2022
Induction brazing is a process in which two or more materials are joined together by a filler metal that has a lower melting point than the base materials using induction heating. Induction heating utilizes the electromagnetic field to provide heat without contact or flame. Induction brazing is more localized, repeatable, and easier to automate compared to traditional torch brazing.
Silver is frequently used for induction brazing because of its low melting point. The filler can be manually applied but because of the more common semiautomatic production a preloaded joint is more commonly used to speed the operation and help to keep a more uniform bond.
the main advantage of induction brazing is its precisely localized heat. Induction heating can be targeted to provide heat to very small areas within tight production tolerances. Only those areas of the part in close proximity to the joint are heated; the rest of the part is not affected. The induction heating coil can be placed directly on the joint, providing a more consistent amount of heat than a torch. Another advantage is that induction brazing is more repeatable than traditional brazing and can be automated. It does not depend on operator’s skills as much as the torch brazing.
Induction brazing can be used to join a wide variety of metals, including nickel, copper, cobalt, titanium, and steel. Some non-metals, such as ceramics, graphite and glass can also be brazed using induction. It is a great way to join dissimilar metals and alloys, thanks to its localized heat and ability to join metals without melting them. Because induction brazing uses electromagnetic field rather than flame, it can be used in many places where flame brazing is not possible or not safe.
Induction brazing does have disadvantages. It is generally more expensive than traditional torch brazing. It may not be the best choice for complex, low volume parts and assemblies because it may require frequent change of heating coils. Induction brazing can be utilized in the most cost-effective way for high volume, repeatable processes, or relatively similar parts.
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