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RE: #SciencePic: Melting metals in an arc
An electric arc furnace (EAF) is a furnace that heats charged material by means of an electric arc.
Industrial arc furnaces range in size from small units of approximately one ton capacity (used in foundries for producing cast iron products) up to about 400 ton units used for secondary steelmaking. Arc furnaces used in research laboratories and by dentists may have a capacity of only a few dozen grams. Industrial electric arc furnace temperatures can be up to 1,800 °C (3,272 °F), while laboratory units can exceed 3,000 °C (5,432 °F).
Arc furnaces differ from induction furnaces in that the charge material is directly exposed to an electric arc, and the current in the furnace terminals passes through the charged material.
Well, thank you for you contribution and addition on furnaces.
I just mentioned this topic to describe the pictures a little better. Maybe, I didn't use the correct terms because of translation issues...
By the way, an induction furnace was sometimes used to heat up directly the mentioned metal ampoules without putting them in silica ampoules, but I have no picture of this. :-)