Some metals cannot be brazed due to their properties and characteristics. One such metal is titanium. Titanium oxidizes rapidly when heated in any gaseous atmosphere, and the resulting titanium oxides cannot be eliminated by any known method in a furnace environment. This makes the surface of the titanium part impossible to braze. Therefore, it is not advisable to attempt to braze titanium in a gaseous atmosphere.
Similarly, metals that have a natural oxide coating can also inhibit the flow of brazing filler metals. If the surface of a metal to be brazed is covered with oxides, it cannot be brazed. Oxide formation must be prevented in the first place.
Aluminum is another metal that requires special consideration when brazing. It develops a stable oxidized layer on the surface called aluminum oxide (Al2O3), which does not wet the filler metals. This oxide layer needs to be suppressed prior to brazing to ensure successful bonding.
Additionally, certain alloys may not be suitable for brazing due to the close melting ranges of the base and filler metals. The brazing method must be able to accurately control the brazing temperature and ensure a homogeneous thermal distribution within the load and on the pieces.
In summary, metals like titanium, metals with natural oxide coatings, and certain alloys with close melting ranges may not be suitable for brazing. Each metal has its own unique characteristics and challenges when it comes to the brazing process.
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