GW(B) series medium frequency coreless induction melting (heat-insulting) furnace are mainly applicable to melting and heat-insulation of ferrous metals such as steel, cast iron, copper and aluminum and their alloy. There are a number of structures such as cast aluminum, pure aluminum or stainless steel, steel frame yoke. Turndown can adopt ways such as manual-operated, speed reducing box or hydraulic pressure etc. Melting speed can be divided into three types according to requirements namely fast, medium and slow. Fast melting furnace can reduce the melting time per furnace to 10-30 minutes. It is particularly applicable to industries, such as precision casting and powder metallurgy.