6 The sponge electrode is then put inside a vacuum arc furnace for melting. In this particular water-cooled, copper container, an electric arc is used to soften the sponge electrode to form an ingot. We use cookies to transform your on the net practical experience. By continuing browsing this Web https://glass-lined-braided-steel48258.blogminds.com/what-is-the-formula-for-aluminum-oxide-can-be-fun-for-anyone-32817085