Brazování

Brazing is a joining process that occurs when two or more metal items are joined together by melting and flowing a filler metal into the joint. The filler metal must have a lower melting point than the base metal. Brazing differs from welding in that the base metal is not melted. Brazing is similar to soldering in that it involves a filler metal and a lower melting point, but the molten filler metal is not a direct tin-base alloy and the melting point of the filler metal is above 450 degrees Celsius (842 degrees Fahrenheit).

Brazing is often used to join dissimilar metals. The process can be used on a wide range of materials, including metals and ceramics. For effective brazing, the surfaces to be joined must be clean and free of oxides. Flux is typically used to prevent oxidation during the heating process and to promote the flow of the filler metal. The joint design is critical for successful brazing; lap joints are generally preferred over butt joints because they provide a larger surface area for the filler metal to bond to.

Common brazing methods include torch brazing, furnace brazing, induction brazing, and dip brazing. Torch brazing uses a torch to heat the joint and melt the filler metal. Furnace brazing involves heating the assembly in a furnace, often in a controlled atmosphere or vacuum to prevent oxidation. Induction brazing uses electromagnetic induction to heat the joint, providing rapid and localized heating. Dip brazing involves immersing the assembly in a molten flux or molten filler metal bath. Brazed joints are strong and can withstand significant stress and vibration. They are also often used in applications where high temperatures or corrosive environments are present.