Vim Var is the double melting process combining vacuum induction melting (VIM) and vacuum arc remelting (VAR). This process is designed to give materials a low degree of nonmetallic inclusions and soft magnetic properties after they have been heat-treated.
Vacuum Induction Melting (VIM) is the process used to melt specialty metals and high-grade steels through electromagnetic induction. Once the metal is melted, it is refined under a vacuum until the desired melt composition is where it needs to be. The VIM process is commonly used to produce the following:
Vacuum Arc Remelting (VAR) is the process used to remelt a consumable electrode with an arc, continuously. During this process, a vacuum is being used at all times in order to extract impurities and to prevent the emergence of oxide. This process is used to improve the purity and quality of the materials being melted in the VIM process. Overall, this is done to improve the strength and fatigue resistance of the materials that first enter the process.