VAB Furnace Line
Description
VAB furnace technology (fluxless brazing) is an ideal solution for vacuum aluminum brazing. During this process, the system eliminates the requirement for flux, which is not required to create joints with an alloy addition in brazed details, or in solid form in the furnace. The key element of vacuum aluminum brazing is the use of magnesium as an alloy addition in brazed details, or as a solid form in the furnace. Magnesium is essential in the process as it can bind oxygen and water vapor upon evaporation, thus improving the vacuum purity. The process also reduces the aluminum oxide on the soldered part surface, allowing the system to wet the details evenly and quickly.
Vacuum aluminum brazing has a very narrow range of acceptable process temperatures. As a rule of thumb, the filler metal must liquefy before the base metal reaches solidus temperature. In most cases, this temperature difference is very small (5-10 ºC), so the process temperature profile and the furnace’s ability to achieve it is critical.
VAB technology is ideal for complex shapes, internal and multi-surface welds, different aluminum grades and their thicknesses.
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