There exist two distinct types of induction furnaces, namely coreless ( a negative term) thus suggesting a furnace with a core, i.e. channel induction furnace. I can do some work on the update of this page, is that cool with you guys? TCKruger 09:06, 30 November 2006 (UTC)
Yes, please add more information. I am trying to build a small scale induction furnace for use with iron, steel and bronze/copper/tin using 120v or 240v 60 Hz power source. I used to know the math on how much energy is transfered based on distances, windings, amperage etc. but have forgotten in my old age. —Preceding unsigned comment added by 18.104.22.168 (talk) 07:00, 31 March 2009 (UTC)
I think that the base assumption that induction furnaces do not refine is a misconception of the process. The charge need not be pure to start with, although it certainly makes it easier on the lab guys when they have to figure out the percentages of refining elements to add to the mix prior to the pour. Crucible alloying is much easier in an induction furnace due to the simplicity of the chemistry vs an old Bessemer process or an arc furnace, both of which must be analyzed during the heat before the final alloy and chemistry adjustments are made.
The semiconductor industry actually started out using induction furnaces to zone refine silicon boluses - the melt zone tended to collect the impurities since the frozen zone consisted of macro-crystalline material.
For a small shop, I agree - a small or medium induction furnace would not probably be used for refining. I don't think I would bother with it if I trusted my source material or the casting contract were non-specific as to metal properties.
pictures/animations would really enhance this article.